 |
|
Use of Low-Molecular-Weight Heparins in the Management of Acute Coronary Artery Syndromes and Percutaneous Coronary Intervention
Graham C. Wong, MD;
Robert P. Giugliano, MD, SM;
Elliott M. Antman, MD
JAMA. 2003;289:331-342.
ABSTRACT
| |
Context Low-molecular-weight heparins (LMWHs) possess several potential pharmacological advantages over unfractionated heparin as an antithrombotic agent.
Objective To systematically summarize the clinical data on the efficacy and safety of LMWHs compared with unfractionated heparin across the spectrum of acute coronary syndromes (ACSs), and as an adjunct to percutaneous coronary intervention (PCI).
Data Sources We searched MEDLINE for articles from 1990 to 2002 using the index terms heparin, enoxaparin, dalteparin, nadroparin, tinzaparin, low molecular weight heparin, myocardial infarction, unstable angina, coronary angiography, coronary angioplasty, thrombolytic therapy, reperfusion, and drug therapy, combination. Additional data sources included bibliographies of articles identified on MEDLINE, inquiry of experts and pharmaceutical companies, and data presented at recent national and international cardiology conferences.
Study Selection We selected for review randomized trials comparing LMWHs against either unfractionated heparin or placebo for treatment of ACS, as well as trials and registries examining clinical outcomes, pharmacokinetics, and/or phamacodynamics of LMWHs in the setting of PCI. Of 39 studies identified, 31 fulfilled criteria for analysis.
Data Extraction Data quality was determined by publication in the peer-reviewed literature or presentation at an official cardiology society–sponsored meeting.
Data Synthesis The LMWHs are recommended by the American Heart Association and the American College of Cardiology for treatment of unstable angina/non–ST-elevation myocardial infarction. Clinical trials have demonstrated similar safety with LMWHs compared with unfractionated heparin in the setting of PCI and in conjunction with glycoprotein IIb/IIIa inhibitors. Finally, LMWHs show promise as an antithrombotic agent for the treatment of ST-elevation myocardial infarction.
Conclusions The LMWHs could potentially replace unfractionated heparin as the antithrombotic agent of choice across the spectrum of ACSs. In addition, they show promise as a safe and efficacious antithrombotic agent for PCI. However, further study is warranted to define the benefit of LMWHs in certain high-risk subgroups before their use can be universally recommended.
INTRODUCTION
The inciting event in an acute coronary syndrome (ACS) typically involves disruption of a vulnerable atherosclerotic plaque with superimposed thrombosis, leading to varying degrees of occlusion of the culprit artery.1-3 ST-elevation myocardial infarction (STEMI) is usually associated with complete thrombotic occlusion of the culprit artery,4 while nonocclusive thrombus is the typical finding associated with unstable angina/non–ST-elevation myocardial infarction (UA/NSTEMI).5-6 Tissue factor exposed following plaque rupture leads to activation of the coagulation cascade and generation of factor Xa (Figure 1).7 Thrombin is formed, which leads to fibrin deposition, platelet activation, and ultimately the formation of a stable clot.8
|
|
|
|
Figure 1. Differential Effects of Unfractionated Heparin and Low-Molecular-Weight Heparin
In acute coronary syndromes, thrombosis is typically initiated via exposure of tissue factor at the site of a disrupted plaque. The complex of tissue factor and Factor VIIa activates Factor X to Xa. Factor Xa subsequently participates in the prothrombinase complex (Factor Xa, Factor Va, Ca++, and a phospholipid membrane, usually from an activated platelet). The tissue factor/VIIa complex also activates Factor IX to IXa, which helps maintain the thrombotic process. Both unfractionated heparin (UFH) and low-molecular-weight heparins (LMWHs) act by complexing with antithrombin III. LMWHs have a relatively greater inhibitory effect on Factor Xa than on factor IIa (thrombin), such that the anti-Xa:IIa inhibitory ratio is greater than 1. This produces greater upstream inhibition of the coagulation cascade and relatively greater reduction of thrombin generation than when unfractionated heparin is administered. Unfractionated heparin has an anti-Xa:IIa inhibitory ratio of 1. While it is theoretically possible to achieve similar anti-Xa activity with unfractionated heparin as with LMWH, because of poor bioavailability very high doses of unfractionated heparin are required that would result in unacceptably high anti-IIa levels and an increased risk of bleeding. Both unfractionated heparin and LMWHs also inhibit coagulation through release of tissue factor pathway inhibitor (TFPI) from endothelial cells. However, unlike unfractionated heparin, LMWHs do not cause TFPI depletion, which has been associated with a paradoxical prothrombotic state during anticoagulant therapy in the setting of acute coronary syndromes.
|
|
|
Given the central role of thrombin in the pathogenesis of ACSs, an antithrombotic agent is an important element in therapy, regardless of whether ST elevation is present. However, there are important limitations associated with unfractionated heparin (currently the most commonly used antithrombotic agent), which has prompted a search for alternative compounds.9 One promising class of agents is the low-molecular-weight heparins (LMWHs), which offer potential advantages in terms of clinical efficacy, safety, and ease of use in the setting of ACS.
METHODS
Studies for this review were identified using MEDLINE searches, reviewing reference lists, and conferring with experts and pharmaceutical companies. The medical subject headings used were heparin, enoxaparin, dalteparin, nadroparin, tinzaparin, low molecular weight heparin, myocardial infarction, unstable angina, coronary angioplasty, thrombolytic therapy, reperfusion,, and drug therapy, combination. In addition, relevant abstracts from the annual meetings of the American Heart Association (AHA), American College of Cardiology (ACC), and European Society of Cardiology were reviewed. We selected for review randomized clinical trials that compared a LMWH with either unfractionated heparin or placebo for the treatment of STEMI and UA/NSTEMI. We also included nonrandomized trials and registries of LMWH that examined clinical outcomes, and/or pharmacokinetics and phamacodynamics in the setting of percutaneous coronary intervention (PCI). Data quality was determined by publication in a peer-reviewed journal or presentation at an official cardiology society–sponsored meeting. Of 39 studies identified, 31 fulfilled criteria for analysis.
RESULTS
Understanding of the pharmacological characteristics of LMWHs has evolved since previous reviews.10-11 The LMWHs act more proximally on the coagulation cascade than unfractionated heparin and more effectively inhibit thrombin generation (Figure 1). Increasing evidence also suggests that LMWHs may differ from unfractionated heparin in other thrombin-dependent and thrombin-independent mechanisms (Table 1). These differences may explain the different pharmacological profiles of LMWH and unfractionated heparin in the setting of ACSs and PCI.
|
|
|
|
Table 1. Limitations of Unfractionated Heparin
|
|
|
Although anti-Xa monitoring is not commonly performed nor recommended in routine clinical practice,12-13 it has been suggested that monitoring of LMWH activity may be of benefit in certain high-risk patient subgroups in which the optimal dose of LMWH has not been established.14 These include patients at weight extremes, patients with renal insufficiency (prolongation of anti-Xa activity),15 and patients who are pregnant (lower than normal anti-Xa activity for a given LMWH).16
Non–ST-Elevation ACSs (UA/NSTEMI)
The LMWHs have been compared with unfractionated heparin for the treatment of UA/NSTEMI in 4 large, prospective randomized trials.17-20 Several meta-analyses comparing unfractionated heparin with LMWH have already demonstrated the superiority of LMWH over placebo21-23 and the superiority of enoxaparin over unfractionated heparin21-22 (Figure 2).
|
|
|
|
Figure 2. Effects of Low-Molecular-Weight Heparins in Unstable Angina on the Combined End Point of Death, Myocardial Infarction, and Recurrent Ischemia With or Without Revascularization
ESSENCE indicates Efficacy and Safety of Subcutaneous Enoxaparin in Non-Q-Wave Coronary Events; FRAXIS, Fraxiparine in Ischaemic Syndrome; FRIC, Fragmin in Unstable Coronary Artery Disease; LMWH, low-molecular-weight heparin; TIMI 11B, Thrombolysis in Myocardial Infarction; and UFH, unfractionated heparin. Reproduced with permission.57
|
|
|
Key differences in clinical trial design, patient selection, and characteristics of the preparations make comparisons among LMWHs difficult. Only 1 trial has compared 2 LMWH preparations in the setting of UA/NSTEMI. The Enoxaparin Versus Tinzaparin (EVET) trial randomized 438 patients presenting with UA/NSTEMI to either enoxaparin (subcutaneous injection of 1 mg/kg twice daily; n = 220) or tinzaparin (subcutaneous injection of 175 IU/kg daily; n = 318).24 The composite primary end point (death, reinfarction, or recurrent angina) was lower with enoxaparin compared with tinzaparin at day 7 (12.3% vs 21.1%; P = .02). This difference, which persisted to 30 days, was driven almost entirely by a reduction in recurrent angina (at 7 days: 11.8% vs 19.3% [P = .03]; at 30 days: 17.3% vs 26.1% [P = .02]). Major bleeding was uncommon and not statistically different between the enoxaparin and tinzaparin groups (3.6% vs 3.2%).
Combination of LMWH and Glycoprotein IIb/IIIa Inhibitors for the Initial Medical Management of ACSs
The combination of enoxaparin and tirofiban resulted in a trend toward a greater proportion of patients achieving more than 70% inhibition of platelet aggregation compared with the combination of unfractionated heparin and tirofiban in the Antithrombotic Combination Using Tirofiban and Enoxaparin (ACUTE I) trial (84% vs 65%),25 suggesting a possible synergistic effect on platelet inhibition from LMWH and glycoprotein IIb/IIIa inhibitors. This combination has since been evaluated in 5 trials of initial medical therapy for UA/NSTEMI (Table 2 and Table 3). The major finding was that major hemorrhage occurred rarely in the LMWH and glycoprotein IIb/IIIa inhibitor arms (0.3%-1.8%). These rates compare favorably with the overall 2.4% rate of major bleeding calculated in a meta-analysis of glycoprotein IIb/IIIa inhibitors and unfractionated heparin for the treatment of ACSs.26 Furthermore, no increase in bleeding was noted among UA/NSTEMI patients who proceeded to PCI. Although not powered to detect differences in clinical events, rates of ischemic events in these trials were noted to be similar between the LMWH and unfractionated heparin groups.
|
|
|
|
Table 2. Characteristics of Trials of Low-Molecular-Weight Heparin and Glycoprotein IIb/IIIa Inhibitor Combination for the Treatment of Unstable Angina/Non–ST-Elevation MI
|
|
|
|
|
|
|
Table 3. Clinical Efficacy and Major Non-CABG Bleeding in Trials Combining Low-Molecular-Weight Heparin and Glycoprotein IIb/IIIa Inhibitor Combination for the Treatment of Unstable Angina/Non-ST-Elevation MI
|
|
|
The combination of tirofiban and enoxaparin was studied in 1224 patients presenting with STEMI in the Treatment of Enoxaparin and Tirofiban in Acute Myocardial Infarction (TETAMI) trial. Patients ineligible for fibrinolysis were randomized in a 2 x 2 fashion to receive either enoxaparin (intravenous 30-mg bolus and subcutaneous injection of 1 mg/kg twice daily) or unfractionated heparin (intravenous 70 U/kg bolus and 15 U/kg per hour infusion) with or without tirofiban (intravenous 10-µg/kg bolus and 0.1-µg/kg per minute infusion) for 2 to 8 days.27 There were no differences noted in the primary efficacy end point between either enoxaparin and unfractionated heparin monotherapy groups (15.4% vs 17.3%) or between enoxaparin and unfractionated heparin combination groups (16.1% vs 17.2%). Major bleeding was rare and not statistically different among all 4 groups.
Duration of Therapy of LMWH in UA/NSTEMI
Evidence suggests that the prothrombotic state associated with an ACS may persist for several months following the index event,28-30 providing a biologically plausible rationale for prolonged antithrombotic therapy in this setting. The LMWHs are attractive as long-term antithrombotic agents by virtue of their safety profile and ease of use, prompting several trials to evaluate their use in the outpatient setting following an acute coronary event.18-20,31
Although the clinical benefit of inhospital LMWH therapy is maintained up to 1 year following the index event32 (hazard ratio, 0.88; 95% confidence interval, 0.81-0.97; P = .008 for the combined end point of death, MI, or urgent revascularization), no additional benefit from use of LMWH beyond hospital discharge has been convincingly demonstrated among UA/NSTEMI patients.17-18,31, 33 In addition, an increase in bleeding with prolonged LMWH treatment has been noted.17
Prolonged treatment with subcutaneous injections of dalteparin in Fragmin and Fast Revascularization During Instability in Coronary Artery Disease (FRISC II) did significantly lower the overall risk of death, MI, and revascularization at 30 days compared with placebo (3.1% vs 5.9%; P = .002).33 However, this benefit was not sustained at 6 months. Because this difference was observed only in patients randomized to the conservative arm of FRISC II,34 the investigators suggested that prolonged antithrombotic therapy may offer benefit as a medical bridge to PCI in patients for whom invasive procedures are delayed.
Benefit of LMWHs in High-Risk Subgroups
A statistically significant benefit of prolonged dalteparin treatment compared with placebo was demonstrated in the subgroup of patients in FRISC and FRISC II who presented with elevated baseline troponin-T levels.35-36 Moreover, an analysis of Efficacy and Safety of Subcutaneous Enoxaparin in Unstable Angina and Non–Q-Wave MI/Thrombolysis in MI (ESSENCE/TIMI 11B) demonstrated that compared with unfractionated heparin, enoxaparin blunted the increase in event rates associated with higher baseline risk,37 and among those who underwent invasive therapy.38 However, the effects of early mechanical revascularization may minimize any early differences attributable to prolonged antithrombotic therapy.34
ST-Elevation Myocardial Infarction
Necessity for Adjunctive Antithrombotic Therapy in Thrombolytic Regimens. The effectiveness of pharmacological reperfusion for STEMI depends on the balance between fibrinolytic and prothrombotic activity. Fibrinolysis enhances the prothrombotic state associated with STEMI by promoting the generation and release of thrombin following successful clot lysis,39-41 and activating the coagulation cascade, leading to further platelet activation.42-44 Therefore, there is sound theoretical rationale to support the use of concurrent antithrombotic therapy to enhance the process of fibrinolysis in STEMI.
Results of Randomized Clinical Trials of LMWH in STEMI. To date, 8 phase 2 trials and 2 large exploratory clinical trials have been completed that evaluate LMWH with fibrinolytic therapy in STEMI (Table 4 and Table 5). Infarct-related arterial patency following fibrinolysis has been evaluated in 3 trials with enoxaparin (Acute MI-Streptokinase [AMI-SK],45 second trial of Heparin and Aspirin Reperfusion Therapy [HART II46], and Enoxaparin Antithrombin Therapy for ST-Elevation Thrombolysis in MI [ENTIRE-TIMI 2347]) and 1 trial with dalteparin (second trial of Biochemical Markers in ACSs [BIOMACS II48]). Use of adjunctive LMWH resulted in improved late coronary artery patency rates (3%-16% absolute improvement in TIMI 2 flow45-47 and TIMI 3 flow49) and a tendency toward higher TIMI 3 flow rates (1%-17% absolute improvement45-49) compared with unfractionated heparin (Table 5). Adjunctive LMWH may also be associated with improved tissue level perfusion following fibrinolysis assessed using ST-segment resolution and other noninvasive composite measurements of reperfusion seen with enoxaparin in the AMI-SK45 and Accelerated Streptokinase and Enoxaparin (ASENOX50) trials, respectively. Rates of other significant clinical events such late infarct-related arterial reocclusion45-46,49 and recurrent ischemia47-48,51 were reduced with LMWH compared with unfractionated heparin. Finally, similar bleeding rates were found with LMWH compared with unfractionated heparin in the majority of completed trials (Table 5).
|
|
|
|
Table 4. Characteristics of Trials Using LMWH in ST-Elevation Myocardial Infarction
|
|
|
|
|
|
|
Table 5. Clinical Efficacy and Major Bleeding in Trials of LMWH in ST-Elevation Myocardial Infarction
|
|
|
However, preliminary results presented at the AHA 2002 Scientific Sessions from the third Assessment of the Safety and Efficacy of a New Thrombolytic PLUS (ASSENT 3 PLUS) underscore the need for continued evaluation of the safety of LMWH as an adjunct to fibrinolysis.52 Among 1639 patients with STEMI receiving tenecteplase and either enoxaparin or unfractionated heparin in a prehospital setting, higher rates of both major bleeding (4.0% vs 2.8%) and intracranial hemorrhage (2.2% vs 1.0%; P = .05) were seen in the enoxaparin group compared with the unfractionated heparin group. There was a significant interaction between patient age and risk of bleeding because almost all cases of intracerebral hemorrhage were confined to patients older than 75 years.
This safety concern of enoxaparin among elderly patients will be addressed in the ongoing (ExTRACT-TIMI 25) trial. This double-blind, parallel group trial is randomizing approximately 21 000 fibrinolysis-eligible STEMI patients in a 1:1 fashion to receive either adjunctive unfractionated heparin (intravenous 60-IU/kg bolus and 12-IU/kg infusion per hour) or enoxaparin (intravenous 30-mg bolus and a subcutaneous injection of 1 mg/kg twice daily). Of note, patients older than 75 years will not receive the intravenous bolus of enoxaparin and will receive only 75% of the subcutaneous injection dose. The primary end point is a composite of all-cause mortality and nonfatal reinfarction within 30 days of randomization.
Low-Molecular-Weight Heparin and PCI
The issue of LMWH treatment in combination with PCI is becoming increasingly relevant given the results of several studies demonstrating the superiority of an invasive approach for the management of both UA/NSTEMI34, 53 and STEMI.54 Compared with the large amount of literature evaluating LMWHs for the medical management of UA/NSTEMI, there are fewer data evaluating LMWHs in the invasive setting. Accordingly, while the ACC, AHA, European Society of Cardiology, and the American College of Chest Physicians have all acknowledged the safety and potential pharmacological advantages of LMWH over unfractionated heparin,55-57 none of these organizations have endorsed the use of LMWH as the preferred antithrombotic agent in the invasive management of UA/NSTEMI. Nevertheless, data suggest that LMWH monotherapy is safe and efficacious in the setting of elective and urgent PCI (Table 6 and Table 7). In addition, several trials have also demonstrated the safety and efficacy using LMWH in combination with a glycoprotein IIb/IIIa inhibitor (Table 8 and Table 9).
|
|
|
|
Table 6. Characteristics of Trials Using Low-Molecular-Weight Heparin Alone in PCI*
|
|
|
|
|
|
|
Table 7. Major Bleeding and Event Rates of Trials Using Low-Molecular-Weight Heparin Alone in PCI*
|
|
|
|
|
|
|
Table 8. Characteristics of Trials of Low-Molecular-Weight Heparin in Combination With Glycoprotein IIb/IIIa Inhibitors in PCI*
|
|
|
|
|
|
|
Table 9. Clinical Efficacy and Major Bleeding in Trials of LMWH in Combination With Glycoprotein IIb/IIIa Inhibitors in PCI*
|
|
|
Unfractionated heparin retains several attractive properties compared with LMWH in the invasive setting, including low cost, complete reversibility with protamine, and the availability of an easily interpretable and standardized point-of-care test (activated clotting time).58 In contrast, protamine is able to fully reverse the effect of LMWH on thrombin, but only 60% of its anti-Xa activity.59 It remains controversial whether routine monitoring of anticoagulation is needed with LMWH in the catheterization laboratory.12-13,60 Moreover, the optimal level of anticoagulation for LMWH during invasive cardiac procedures has not been prospectively defined.
Since LMWH does not appreciably affect either the activated partial thromboplastin time or activated clotting time, clinical trials have focused on the anti-Xa activity as a surrogate to assess the level of anticoagulation. Although now commercially available, routine monitoring of anticoagulation with LMWH has not been universally adopted. The currently accepted therapeutic activity of LMWH in PCI (anti-Xa, >0.5-1.8 IU/mL) is based primarily on clinical data from the deep venous thrombosis literature60 and dose-ranging studies in UA/NSTEMI.61 In TIMI 11A, enoxaparin administered as an intravenous 30-mg bolus followed by a subcutaneous injection of 1 mg/kg twice daily generated trough anti-Xa activity of 0.5 IU/mL and peak activity of 1.1 IU/mL, with a low rate (2.7%) of major hemorrhage among patients undergoing PCI.61 Several trials have demonstrated that reliable levels of anti-Xa activity consistently greater than the 0.5 IU/mL threshold may be obtained using various doses of LMWH when administered several days or immediately before PCI (Table 10).
|
|
|
|
Table 10. Anticoagulant Profiles of LMWH in Elective and Urgent PCI
|
|
|
From the available data, 2 strategies have emerged guiding the use of LMWH (with or without concomitant glycoprotein IIb/IIIa inhibition) for PCI. First, unfractionated heparin has been substituted for LMWH prior to angiography and coronary intervention if the last LMWH dose was given more than 8 to 12 hours before the procedure.34, 38, 62-63 Second, a number of pilot trials have evaluated the use of LMWH as the sole anticoagulant throughout angiography and intervention without changing to unfractionated heparin.25, 64-73 However, these 2 strategies have not been directly compared. With the limited data available, both approaches appear to be safe and efficacious, with bleeding and clinical event rates similar to historical controls (Table 7 and Table 9). Ongoing large trials (ie, A to Z,74 SYNERGY75) will yield additional information on the safety and efficacy of enoxaparin and glycoprotein IIb/IIIa inhibition in the PCI setting.
Current Recommendations and Observations From Clinical Trials
Unstable Angina/Non–ST-Elevation MI. Based on the available evidence, the 2002 ACC and AHA guidelines list the use of either LMWH or unfractionated heparin as a class I recommendation for the treatment of UA/NSTEMI (level of evidence, A).57 In addition, use of enoxaparin is preferred over unfractionated heparin (class IIA; level of evidence, A), except if coronary artery bypass graft surgery is anticipated within 24 hours.57
ST-Elevation MI. Completed trials of adjunctive LMWH compared with either placebo or unfractionated heparin in the setting of STEMI have demonstrated lower rates of late ischemic events and improved rates of late coronary artery patency. The increased bleeding seen with prehospital enoxaparin in ASSENT-3 PLUS requires further study and possible dose modification in elderly patients, although it appears LMWHs are safe among patients younger than 75 years. ExTRACT-TIMI 25, ADVANCE-MI, and FINESSE will be able to provide more definitive data regarding the utility of enoxaparin in modern reperfusion regimens in all age groups.
Percutaneous Coronary Intervention
Although an expert consensus statement has been published with recommendations of LMWH in the setting of PCI,60 the most recent guidelines from the ACC and AHA do not discuss the use of LMWH as the sole anticoagulant in the setting of PCI.76 Moreover, the optimal level of anticoagulation has not been prospectively validated, although similar efficacy and safety outcomes with LMWH compared with unfractionated heparin (with and without concomitant glycoprotein IIb/IIIa inhibitors) have been shown with a target anti-Xa level of higher than 0.5 IU/mL.
Low-molecular-weight heparin may be used as the sole anticoagulant during PCI. Dalteparin should be given at a dose of 120 IU/kg subcutaneously twice daily provided PCI is performed within 8 hours.34 If PCI is to be performed more than 8 to 12 hours following the last subcutaneous injection dose, patients should be given an additional 60-IU/kg intravenous bolus of dalteparin.70 Enoxaparin may be given subcutaneously at a dose of 1 mg/kg twice daily without the need for further supplementation if PCI is performed within 8 hours.38, 67-68 An additional 0.3-mg/kg intravenous bolus should be given if PCI is performed between 8 and 12 hours after the last subcutaneous dose.71-72 Subcutaneous enoxaparin should be reduced for patients with severe renal insufficiency (creatinine clearance <30 mL/min [<0.501 mL/s]). A single 0.5-mg/kg intravenous dose of enoxaparin without further subcutaneous dosing may be safe and efficacious in the setting of moderate-to-severe renal failure.73 Alternatively, unfractionated heparin may be substituted for enoxaparin if PCI is to be performed more than 8 to 12 hours following the last subcutaneous dose of enoxaparin.38
Low-molecular-weight heparin can also be used in conjunction with glycoprotein IIb/IIIa inhibitors. Data from several clinical trials suggest that the combination of enoxaparin with various glycoprotein IIb/IIIa inhibitors66, 68-69,77 and dalteparin with abciximab70 are safe in the setting of PCI. More definitive information will be forthcoming about the combination of enoxaparin and glycoprotein IIb/IIIa inhibitors during PCI.74-75
CONCLUSIONS
The use of LMWH has been established as a first-line choice in the treatment of UA/NSTEMI, and increasing evidence suggests that it may supplant unfractionated heparin as an anticoagulant in the setting of PCI and STEMI. However, more clinical data regarding the safety of these agents in elderly patients and in combination with potent platelet inhibitors such as thienopyridines and glycoprotein IIb/IIIa inhibitors are needed before their routine adoption in the setting of STEMI and PCI.
AUTHOR INFORMATION
Corresponding Author and Reprints: Robert P. Giugliano, MD, SM, TIMI Study Group, 350 Longwood Ave, First Floor Offices, Boston, MA 02115 (e-mail: rgiugliano{at}partners.org).
Author Contributions: Study concept and design: Wong, Giugliano, Antman.
Acquisition of data: Wong, Giugliano, Antman.
Analysis and interpretation of data: Wong, Giugliano, Antman.
Drafting of the manuscript: Wong, Giugliano, Antman.
Critical revision of the manuscript for important intellectual content: Wong, Giugliano, Antman.
Statistical expertise: Giugliano.
Administrative, technical, or material support: Antman.
Study supervision: Giugliano, Antman.
Financial Disclosures: Dr Giugliano has received honoraria from Aventis for educational programs. Dr Antman has received clinical research grants from Aventis.
Author Affiliations: TIMI Study Group, Brigham and Women's Hospital, Boston, Mass.
REFERENCES
| |
1. Ambrose JA. Plaque disruption and the acute coronary syndromes of unstable angina and myocardial infarction: if the substrate is similar, why is the clinical presentation different? J Am Coll Cardiol. 1992;19:1653-1658.
ABSTRACT
2. Ambrose JA, Weinrauch M. Thrombosis in ischemic heart disease. Arch Intern Med. 1996;156:1382-1394.
FREE FULL TEXT
3. Libby P. Current concepts of the pathogenesis of the acute coronary syndromes. Circulation. 2001;104:365-372.
FREE FULL TEXT
4. DeWood MA, Spores J, Notske R, et al. Prevalence of total coronary occlusion during the early hours of transmural myocardial infarction. N Engl J Med. 1980;303:897-902.
ABSTRACT
5. Davies MJ, Thomas A. Plaque fissuring—the cause of acute myocardial infarction, sudden ischemic death, and crescendo angina. Br Heart J. 1985;53:363-373.
FREE FULL TEXT
6. Davies MJ, Thomas AC, Knapman PA, Hangartner JR. Intramyocardial platelet aggregation in patients with unstable angina suffering sudden ischemic cardiac death. Circulation. 1986;73:418-427.
FREE FULL TEXT
7. Ardissino D, Merlini PA, Arlens R, et al. Tissue factor in human coronary atherosclerotic plaques. Clin Chim Acta. 2000;291:235-240.
FULL TEXT
|
ISI
| PUBMED
8. Weitz JI. Activation of blood coagulation by plaque rupture: mechanisms and prevention. Am J Cardiol. 1995;75:18B-22B.
FULL TEXT
|
ISI
| PUBMED
9. Antman EM. The search for replacements for unfractionated heparin. Circulation. 2001;103:2310-2314.
FREE FULL TEXT
10. Harenberg J. Pharmacology of low molecular weight heparins. Semin Thromb Hemost. 1990;16(suppl):12-18.
11. Weitz JI. Low-molecular-weight heparins. N Engl J Med. 1997;337:688-698.
FREE FULL TEXT
12. Boneu B. Low molecular weight heparin therapy: is monitoring needed? Thromb Haemost. 1994;72:330-334.
ISI
| PUBMED
13. Abbate R, Gori AM, Farsi A, Attanasio M, Pepe G. Monitoring of low-molecular-weight heparins in cardiovascular disease. Am J Cardiol. 1998;82:33L-36L.
14. Duplaga BA, Rivers CW, Nutescu E. Dosing and monitoring of low-molecular-weight heparins in special populations. Pharmacotherapy. 2001;21:218-234.
FULL TEXT
|
ISI
| PUBMED
15. Bastani B, Gonzalez E. Prolonged anti-factor Xa level in a patient with moderate renal insufficiency receiving enoxaparin. Am J Nephrol. 2002;22:403-404.
FULL TEXT
|
ISI
| PUBMED
16. Casele HL, Laifer SA, Woelkers DA, Venkataramanan R. Changes in the pharmacokinetics of the low-molecular-weight heparin enoxaparin sodium during pregnancy. Am J Obstet Gynecol. 1999;181:1113-1117.
FULL TEXT
|
ISI
| PUBMED
17. The FRAXIS Investigators. Comparison of two treatment durations (6 days and 14 days) of a low molecular weight heparin with a 6-day treatment of unfractionated heparin in the initial management of unstable angina or non-Q wave myocardial infarction: FRAXIS (FRAxiparine in Ischaemic Syndrome). Eur Heart J. 1999;20:1553-1562.
FREE FULL TEXT
18. Antman EM, McCabe CH, Gurfinkel EP, et al. Enoxaparin prevents death and cardiac ischemic events in unstable angina/non–Q-wave myocardial infarction: results of the thrombolysis in myocardial infarction (TIMI) 11B trial. Circulation. 1999;100:1593-1601.
FREE FULL TEXT
19. Cohen M, Demers C, Gurfinkel EP, et al. A comparison of low-molecular-weight heparin with unfractionated heparin for unstable coronary artery disease: Efficacy and Safety of Subcutaneous Enoxaparin in Non-Q-Wave Coronary Events Study Group. N Engl J Med. 1997;337:447-452.
FREE FULL TEXT
20. Klein W, Buchwald A, Hillis SE, et al. Comparison of low-molecular-weight heparin with unfractionated heparin acutely and with placebo for 6 weeks in the management of unstable coronary artery disease: Fragmin in Unstable Coronary Artery Disease Study (FRIC). Circulation. 1997;96:61-68.
FREE FULL TEXT
21. Antman EM, Cohen M, Radley D, et al. Assessment of the treatment effect of enoxaparin for unstable angina/non–Q-wave myocardial infarction: TIMI 11B-ESSENCE meta-analysis. Circulation. 1999;100:1602-1608.
FREE FULL TEXT
22. Kaul S, Shah PK. Low molecular weight heparin in acute coronary syndrome: evidence for superior or equivalent efficacy compared with unfractionated heparin? J Am Coll Cardiol. 2000;35:1699-1712.
FREE FULL TEXT
23. Eikelboom JW, Anand SS, Malmberg K, Weitz JI, Ginsberg JS, Yusuf S. Unfractionated heparin and low-molecular-weight heparin in acute coronary syndrome without ST elevation: a meta-analysis. Lancet. 2000;355:1936-1942.
FULL TEXT
|
ISI
| PUBMED
24. Michalis LK, Katsouras C, Papamichael N, et al. Enoxaparin versus tinzaparin in non-ST-segment elevation acute coronary syndromes: the EVET trial. Am Heart J. In press.
25. Cohen M, Theroux P, Weber S, et al. Combination therapy with tirofiban and enoxaparin in acute coronary syndromes. Int J Cardiol. 1999;71:273-281.
FULL TEXT
|
ISI
| PUBMED
26. Boersma E, Harrington RA, Moliterno DJ, et al. Platelet glycoprotein IIb/IIIa inhibitors in acute coronary syndromes: a meta-analysis of all major randomised clinical trials. Lancet. 2002;359:189-198.
FULL TEXT
|
ISI
| PUBMED
27. Cohen M. The Treatment with Enoxaparin and Tirofiban in Acute Myocardial Infarction (TETAMI) Study. Paper presented at: American Heart Association 75th Scientific Sessions; November 17-20, 2002; Chicago, Ill.
28. Merlini PA, Bauer KA, Oltrona L, et al. Persistent activation of coagulation mechanism in unstable angina and myocardial infarction. Circulation. 1994;90:61-68.
FREE FULL TEXT
29. Ernofsson M, Strekerud F, Toss H, Abildgaard U, Wallentin L. Low molecular weight heparin reduces the generation and activity of thrombin in unstable coronary artery disease. Thromb Haemost. 1998;79:491-494.
ISI
| PUBMED
30. Merlini PA, Ardissino D, Rosenberg RD, et al. In vivo thrombin generation and activity during and after intravenous infusion of heparin or recombinant hirudin in patients with unstable angina pectoris. Arterioscler Thromb Vasc Biol. 2000;20:2162-2166.
FREE FULL TEXT
31. The FRISC Study Group. Low-molecular-weight heparin during instability in coronary artery disease: Fragmin During Instability in Coronary Artery Disease (FRISC) Study Group. Lancet. 1996;347:561-568.
FULL TEXT
|
ISI
| PUBMED
32. Antman EM, Cohen M, McCabe C, Goodman SG, Murphy SA, Braunwald E. Enoxaparin is superior to unfractionated heparin for preventing clinical events at 1-year follow-up of TIMI 11B and ESSENCE. Eur Heart J. 2002;23:308-314.
FREE FULL TEXT
33. The FRISC II Investigators. Long-term low-molecular-mass heparin in unstable coronary-artery disease: FRISC II prospective randomised multicentre study. Lancet. 1999;354:701-707.
FULL TEXT
|
ISI
| PUBMED
34. The FRISC II Investigators. Invasive compared with non-invasive treatment in unstable coronary-artery disease: FRISC II prospective randomised multicentre study: Fragmin and Fast Revascularisation During Instability in Coronary Artery Disease Investigators. Lancet. 1999;354:708-715.
FULL TEXT
|
ISI
| PUBMED
35. Lindahl B, Venge P, Wallentin L. Troponin T identifies patients with unstable coronary artery disease who benefit from long-term antithrombotic protection: Fragmin in Unstable Coronary Artery Disease (FRISC) Study Group. J Am Coll Cardiol. 1997;29:43-48.
ABSTRACT
36. Lindahl B, Diderholm E, Lagerqvist B, Venge P, Wallentin L. Mechanisms behind the prognostic value of troponin T in unstable coronary artery disease: a FRISC II substudy. J Am Coll Cardiol. 2001;38:979-986.
FREE FULL TEXT
37. Antman EM, Cohen M, Bernink PJ, et al. The TIMI risk score for unstable angina/non–ST-elevation MI: a method for prognostication and therapeutic decision making. JAMA. 2000;284:835-842.
FREE FULL TEXT
38. Fox K, Antman E, Cohen M, Bigonzi F. Comparison of enoxaparin versus unfractionated heparin in patients with unstable angina pectoris/non-ST-segment elevation acute myocardial infarction having subsequent percutaneous coronary intervention. Am J Cardiol. 2002;90:477-482.
FULL TEXT
|
ISI
| PUBMED
39. Seitz R, Pelzer H, Immel A. Prothrombin activation by thrombolytic agents. Fibrinolysis. 1993;7:109-115.
FULL TEXT
|
ISI
40. Eisenberg PR, Sherman L, Rich M, et al. Importance of continued activation of thrombin reflected by fibrinopeptide A to the efficacy of thrombolysis. J Am Coll Cardiol. 1986;7:1255-1262.
ABSTRACT
41. Eisenberg PR, Sherman LA, Jaffe AS. Paradoxic elevation of fibrinopeptide A after streptokinase: evidence for continued thrombosis despite intense fibrinolysis. J Am Coll Cardiol. 1987;10:527-529.
ABSTRACT
42. Fitzgerald DJ, Catella F, Roy L, FitzGerald GA. Marked platelet activation in vivo after intravenous streptokinase in patients with acute myocardial infarction. Circulation. 1988;77:142-150.
FREE FULL TEXT
43. Coulter SA, Cannon CP, Ault KA, et al. High levels of platelet inhibition with abciximab despite heightened platelet activation and aggregation during thrombolysis for acute myocardial infarction: results from TIMI (Thrombolysis in Myocardial Infarction) 14. Circulation. 2000;101:2690-2695.
FREE FULL TEXT
44. Kerins DM, Roy L, FitzGerald GA, Fitzgerald DJ. Platelet and vascular function during coronary thrombolysis with tissue-type plasminogen activator. Circulation. 1989;80:1718-1725.
FREE FULL TEXT
45. Simoons M, Krzeminska-Pakula M, Alonso A, et al. Improved reperfusion and clinical outcome with enoxaparin as an adjunct to streptokinase thrombolysis in acute myocardial infarction: the AMI-SK study. Eur Heart J. 2002;23:1282.
FREE FULL TEXT
46. Ross AM, Molhoek P, Lundergan C, et al. Randomized comparison of enoxaparin, a low-molecular-weight heparin, with unfractionated heparin adjunctive to recombinant tissue plasminogen activator thrombolysis and aspirin: second trial of Heparin and Aspirin Reperfusion Therapy (HART II). Circulation. 2001;104:648-652.
FREE FULL TEXT
47. Antman EM, Louwerenburg HW, Baars HF, et al. Enoxaparin as adjunctive antithrombin therapy for ST-elevation myocardial infarction: results of the ENTIRE-Thrombolysis in Myocardial Infarction (TIMI) 23 Trial. Circulation. 2002;105:1642-1649.
FREE FULL TEXT
48. Frostfeldt G, Ahlberg G, Gustafsson G, et al. Low molecular weight heparin (dalteparin) as adjuvant treatment of thrombolysis in acute myocardial infarction—a pilot study: Biochemical Markers in Acute Coronary Syndromes (BIOMACS II). J Am Coll Cardiol. 1999;33:627-633.
FREE FULL TEXT
49. Wallentin L, Dellborg DM, Lindahl B, Nilsson T, Pehrsson K, Swahn E. The low-molecular-weight heparin dalteparin as adjuvant therapy in acute myocardial infarction: the ASSENT PLUS study. Clin Cardiol. 2001;24(3 suppl):I12-I14.
50. Tatu-Chitoiu G, Tatu-Chitoiu A, Bumbu A, et al. Accelerated streptokinase and enoxaparine: a new thrombolytic regimen in acute myocardial infarction (the ASENOX study) [abstract]. Eur Heart J. 2000;21(suppl):177.
51. Baird SH, Menown IB, McBride SJ, Trouton TG, Wilson C. Randomized comparison of enoxaparin with unfractionated heparin following fibrinolytic therapy for acute myocardial infarction. Eur Heart J. 2002;23:627-632.
FREE FULL TEXT
52. Wallentin L. ASSENT 3 PLUS. Paper presented at: American Heart Association 75th Scientific Sessions; November 17-20; 2002; Chicago, Ill.
53. Cannon CP, Weintraub WS, Demopoulos LA, et al. Comparison of early invasive and conservative strategies in patients with unstable coronary syndromes treated with the glycoprotein IIb/IIIa inhibitor tirofiban. N Engl J Med. 2001;344:1879-1887.
FREE FULL TEXT
54. Zijlstra F, Hoorntje JC, de Boer MJ, et al. Long-term benefit of primary angioplasty as compared with thrombolytic therapy for acute myocardial infarction. N Engl J Med. 1999;341:1413-1419.
FREE FULL TEXT
55. Bertrand ME, Simoons M, Fox KA. Management of acute coronary syndromes: acute coronary syndromes without persistent ST segment elevation; recommendations of the Task Force of the European Society of Cardiology. Eur Heart J. 2000;21:1406-1432.
FREE FULL TEXT
56. Cairns JA, Theroux P, Lewis HD Jr, Ezekowitz M, Meade TW. Antithrombotic agents in coronary artery disease. Chest. 2001;119(1 suppl):228S-252S.
57. Braunwald E, Antman EM, Beasley JW, et al. ACC/AHA 2002 guideline update for the management of patients with unstable angina and non-ST-segment elevation myocardial infarction: a report of the American College of Cardiology/American Heart Association Task Force on Practice Guidelines (Committee of the Management of Patients With Unstable Angina). Available at: http://www.acc.org/clinical/guidelines/unstable/unstable.pdf. Accessed November 29, 2002.
58. Melandri G, Branzi A, Traini AM, Semprini F, Cervi V, Magnani B. On the value of the activated clotting time for monitoring heparin therapy in acute coronary syndromes. Am J Cardiol. 1993;71:469-471.
FULL TEXT
|
ISI
| PUBMED
59. Gram J, Mercker S, Bruhn HD. Does protamine chloride neutralize low molecular weight heparin sufficiently? Thromb Res. 1988;52:353-359.
FULL TEXT
|
ISI
| PUBMED
60. Kereiakes DJ, Montalescot G, Antman EM, et al. Low-molecular-weight heparin therapy for non-ST-elevation acute coronary syndromes and during percutaneous coronary intervention: an expert consensus. Am Heart J. 2002;144:615-624.
ISI
| PUBMED
61. The Thrombolysis in Myocardial Infarction (TIMI) 11A Trial Investigators. Dose-ranging trial of enoxaparin for unstable angina: results of TIMI 11A. J Am Coll Cardiol. 1997;29:1474-1482.
ABSTRACT
62. Goodman S, Cohen M, Bigonzi F. Randomized trial of low molecular weight heparin (enoxaparin) versus unfractionated heparin for unstable coronary artery disease: one-year results of the ESSENCE Study: Efficacy and Safety of Subcutaneous Enoxaparin in Non-Q Wave Coronary Events. J Am Coll Cardiol. 2000;36:693-698.
FREE FULL TEXT
63. Bassand JP. Low molecular weight heparin in patients undergoing interventional therapy: the ANGIOFRAX study [in German]. Paper presented at: XXIInd Congress of the European Society of Cardiology; August 26-30, 2000; Amsterdam, the Netherlands.
64. Karsch KR, Preisack MB, Baildon R, et al. Low molecular weight heparin (reviparin) in percutaneous transluminal coronary angioplasty: results of a randomized, double-blind, unfractionated heparin and placebo-controlled, multicenter trial (REDUCE trial): Reduction of Restenosis After PTCA, Early Administration of Reviparin in a Double-Blind Unfractionated Heparin and Placebo-Controlled Evaluation. J Am Coll Cardiol. 1996;28:1437-1443.
ABSTRACT
65. Rabah MM, Premmereur J, Graham M, et al. Usefulness of intravenous enoxaparin for percutaneous coronary intervention in stable angina pectoris. Am J Cardiol. 1999;84:1391-1395.
FULL TEXT
|
ISI
| PUBMED
66. Cohen M, Theroux P, Borzak S, et al. Randomized double-blind safety study of enoxaparin versus unfractionated heparin in patients with non-ST-segment elevation acute coronary syndromes treated with tirofiban and aspirin: the ACUTE II study: the Antithrombotic Combination Using Tirofiban and Enoxaparin. Am Heart J. 2002;144:470-477.
FULL TEXT
|
ISI
| PUBMED
67. Collet JP, Montalescot G, Lison L, et al. Percutaneous coronary intervention after subcutaneous enoxaparin pretreatment in patients with unstable angina pectoris. Circulation. 2001;103:658-663.
FREE FULL TEXT
68. Kereiakes DJ, Grines C, Fry E, et al. Enoxaparin and abciximab adjunctive pharmacotherapy during percutaneous coronary intervention. J Invasive Cardiol. 2001;13:272-278.
PUBMED
69. Mukherjee D, Mahaffey KW, Moliterno DJ, et al. Promise of combined low-molecular-weight heparin and platelet glycoprotein IIb/IIIa inhibition: results from Platelet IIb/IIIa Antagonist for the Reduction of Acute coronary syndrome events in a Global Organization Network B (PARAGON B). Am Heart J. 2002;144:995-1002.
FULL TEXT
|
ISI
| PUBMED
70. Kereiakes DJ, Kleiman NS, Fry E, et al. Dalteparin in combination with abciximab during percutaneous coronary intervention. Am Heart J. 2001;141:348-352.
FULL TEXT
|
ISI
| PUBMED
71. Ferguson JJ. The use of enoxaparin and IIb/IIIa antagonists in acute coronary syndromes; including PCI: final results of the NICE 3 study. J Am Coll Cardiol. 2001;37(suppl A):365A.
72. Martin JL, Fry ET, Serano A. Pharmacokinetic study of enoxaparin in patients undergoing coronary intervention after treatment with subcutaneous enoxaparin in acute coroanry syndromes: the PEPCI Study [abstract]. Eur Heart J. 2001;22(suppl):14.
73. Choussat R, Montalescot G, Collet JP, et al. A unique, low dose of intravenous enoxaparin in elective percutaneous coronary intervention. J Am Coll Cardiol. 2002;40:1943-1950.
FREE FULL TEXT
74. Blazing MA, De Lemos JA, Dyke CK, Califf RM, Bilheimer D, Braunwald E. The A-to-Z Trial: methods and rationale for a single trial investigating combined use of low-molecular-weight heparin with the glycoprotein IIb/IIIa inhibitor tirofiban and defining the efficacy of early aggressive simvastatin therapy. Am Heart J. 2001;142:211-217.
FULL TEXT
|
ISI
| PUBMED
75. The SYNERGY Executive Committee. The SYNERGY trial: study design and rationale. Am Heart J. 2002;143:952-960.
FULL TEXT
|
ISI
| PUBMED
76. Smith SC Jr, Dove JT, Jacobs AK, et al. ACC/AHA guidelines for percutaneous coronary intervention: a report of the American College of Cardiology/American Heart Association Task Force on Practice Guidelines (committee to revise the 1993 guidelines for percutaneous transluminal coronary angioplasty). J Am Coll Cardiol. 2001;37:2215-2239.
FREE FULL TEXT
77. Bhatt DL, Lee BI, Casterella PJ, et al. Safety of concomitant therapy with eptifibatide and enoxaparin in patients undergoing percutaneous coronary intervention—results of the CRUISE study. J Am Coll Cardiol. In press.
78. Barzu T, Molho P, Tobelem G, Petitou M, Caen J. Binding and endocytosis of heparin by human endothelial cells in culture. Biochim Biophys Acta. 1985;845:196-203.
PUBMED
79. Young E, Wells P, Holloway S, Weitz J, Hirsh J. Ex-vivo and in-vitro evidence that low molecular weight heparins exhibit less binding to plasma proteins than unfractionated heparin. Thromb Haemost. 1994;71:300-304.
ISI
| PUBMED
80. Bara L, Billaud E, Gramond G, Kher A, Samama M. Comparative pharmacokinetics of a low molecular weight heparin (PK 10 169) and unfractionated heparin after intravenous and subcutaneous administration. Thromb Res. 1985;39:631-636.
FULL TEXT
|
ISI
| PUBMED
81. Bara L, Bloch MF, Zitoun D, et al. Comparative effects of enoxaparin and unfractionated heparin in healthy volunteers on prothrombin consumption in whole blood during coagulation, and release of tissue factor pathway inhibitor. Thromb Res. 1993;69:443-452.
FULL TEXT
|
ISI
| PUBMED
82. Merlini PA, Bauer KA, Oltrona L, et al. Thrombin generation and activity during thrombolysis and concomitant heparin therapy in patients with acute myocardial infarction. J Am Coll Cardiol. 1995;25:203-209.
ABSTRACT
83. Sandset PM, Bendz B, Hansen JB. Physiological function of tissue factor pathway inhibitor and interaction with heparins. Haemostasis. 2000;30(suppl 2):48-56.
84. Hansen JB, Sandset PM. Differential effects of low molecular weight heparin and unfractionated heparin on circulating levels of antithrombin and tissue factor pathway inhibitor (TFPI): a possible mechanism for difference in therapeutic efficacy. Thromb Res. 1998;91:177-181.
FULL TEXT
|
ISI
| PUBMED
85. Hansen JB, Sandset PM, Huseby KR, et al. Differential effect of unfractionated heparin and low molecular weight heparin on intravascular tissue factor pathway inhibitor: evidence for a difference in antithrombotic action. Br J Haematol. 1998;101:638-646.
FULL TEXT
|
ISI
| PUBMED
86. Hansen JB, Naalsund T, Sandset PM, Svensson B. Rebound activation of coagulation after treatment with unfractionated heparin and not with low molecular weight heparin is associated with partial depletion of tissue factor pathway inhibitor and antithrombin. Thromb Res. 2000;100:413-417.
FULL TEXT
|
ISI
| PUBMED
87. Cella G, Girolami A, Sasahara AA. Platelet activation with unfractionated heparin at therapeutic concentrations and comparison with low-molecular-weight heparin and with a direct thrombin inhibitor. Circulation. 1999;99:3323.
FREE FULL TEXT
88. Montalescot G, Philippe F, Ankri A, et al. Early increase of von Willebrand factor predicts adverse outcome in unstable coronary artery disease: beneficial effects of enoxaparin: French Investigators of the ESSENCE Trial. Circulation. 1998;98:294-299.
FREE FULL TEXT
89. Morrow DA, Rifai N, Bigonzi F, et al. Enoxaparin attenuates the rise in Von wilebrand factor in patients with ST-segment elevation myocardial infarction treated with fibrinolysis: results from ENTIRE-TIMI 23. Eur Heart J. 2002;23(suppl):506.
90. Xiao Z, Theroux P. Platelet activation with unfractionated heparin at therapeutic concentrations and comparisons with a low-molecular-weight heparin and with a direct thrombin inhibitor. Circulation. 1998;97:251-256.
FREE FULL TEXT
91. Serra A, Esteve J, Reverter JC, Lozano M, Escolar G, Ordinas A. Differential effect of a low-molecular-weight heparin (dalteparin) and unfractionated heparin on platelet interaction with the subendothelium under flow conditions. Thromb Res. 1997;87:405-410.
FULL TEXT
|
ISI
| PUBMED
92. James S, Armstrong P, Califf R, et al. Safety and efficacy of abciximab combined with dalteparin in treatment of acute coronary syndromes. Eur Heart J. 2002;23:1538-1545.
FREE FULL TEXT
93. Goodman S. Integrilin and Enoxaparin Randomized Assessment of Acute Coronary Syndromes Treatment (INTERACT). Paper presented at: American College of Cardiology 51st Annual Scientific Session; March 17-20, 2002; Atlanta, Ga.
94. Kontny F, Dale J, Abildgaard U, Pedersen TR. Randomized trial of low molecular weight heparin (dalteparin) in prevention of left ventricular thrombus formation and arterial embolism after acute anterior myocardial infarction: the Fragmin in Acute Myocardial Infarction (FRAMI) Study. J Am Coll Cardiol. 1997;30:962-969.
ABSTRACT
95. The ASSENT 3 Investigators. Efficacy and safety of tenecteplase in combination with enoxaparin, abciximab, or unfractionated heparin: the ASSENT-3 randomised trial in acute myocardial infarction. Lancet. 2001;358:605-613.
FULL TEXT
|
ISI
| PUBMED
Clinical Cardiology Section Editor: Michael S. Lauer, MD, Contributing Editor.
 CiteULike  Connotea  Del.icio.us  Digg  Reddit  Technorati  Twitter
What's this?
THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES
|
Acute ST-Segment Elevation Myocardial Infarction: American College of Chest Physicians Evidence-Based Clinical Practice Guidelines (8th Edition)
Goodman et al.
Chest 2008;133:708S-775S.
ABSTRACT
| FULL TEXT
Adverse Impact of Bleeding on Prognosis in Patients With Acute Coronary Syndromes
Eikelboom et al.
Circulation 2006;114:774-782.
ABSTRACT
| FULL TEXT
Angiographic and Clinical Outcomes in Patients Receiving Low-Molecular-Weight Heparin Versus Unfractionated Heparin in ST-Elevation Myocardial Infarction Treated With Fibrinolytics in the CLARITY-TIMI 28 Trial
Sabatine et al.
Circulation 2005;112:3846-3854.
ABSTRACT
| FULL TEXT
Unfractionated and Low-Molecular-Weight Heparin as Adjuncts to Thrombolysis in Aspirin-Treated Patients With ST-Elevation Acute Myocardial Infarction: A Meta-Analysis of the Randomized Trials
Eikelboom et al.
Circulation 2005;112:3855-3867.
ABSTRACT
| FULL TEXT
Non-ST-segment elevation acute coronary syndrome in patients with renal dysfunction: benefit of low-molecular-weight heparin alone or with glycoprotein IIb/IIIa inhibitors on outcomes. The Global Registry of Acute Coronary Events
Collet et al.
Eur Heart J 2005;26:2285-2293.
ABSTRACT
| FULL TEXT
Percutaneous Coronary Intervention and Adjunctive Pharmacotherapy in Women: A Statement for Healthcare Professionals From the American Heart Association
Lansky et al.
Circulation 2005;111:940-953.
ABSTRACT
| FULL TEXT
Effects of Reviparin, a Low-Molecular-Weight Heparin, on Mortality, Reinfarction, and Strokes in Patients With Acute Myocardial Infarction Presenting With ST-Segment Elevation
The CREATE Trial Group Investigators*
JAMA 2005;293:427-435.
ABSTRACT
| FULL TEXT
Managing Complications of Anticoagulant Therapy
Smythe et al.
Journal of Pharmacy Practice 2004;17:327-346.
ABSTRACT
Diminishing returns ...and too many choices ...the saga of pharmacologic therapy to reduce the complications of percutaneous coronary intervention
Stadius
J Am Coll Cardiol 2004;44:25-27.
FULL TEXT
The re-emergence of anticoagulation in coronary disease
Antman
Eur Heart J Suppl 2004;6:B2-B8.
ABSTRACT
| FULL TEXT
ADDITIONAL ARTICLES ABSTRACTED IN ACP JOURNAL CLUB
Evid. Based Med. 2003;8:163-163.
FULL TEXT
Application of Current Guidelines to the Management of Unstable Angina and Non-ST-Elevation Myocardial Infarction
Braunwald
Circulation 2003;108:III-28-37.
ABSTRACT
| FULL TEXT
Should Bivalirudin Replace Heparin During Percutaneous Coronary Interventions?
Antman
JAMA 2003;289:903-905.
FULL TEXT
LMWHs May Replace Unfractionated Heparin for Treatment of Acute Coronary Syndromes
JWatch Emergency Med. 2003;2003:5-5.
FULL TEXT
|
