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Caffeine and Incident Hypertension in Women
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To the Editor: Dr Winkelmayer and colleagues1 reported that habitual coffee consumption was not associated with increased risk of hypertension in a 12-year follow-up of the Nurses' Health Studies I and II. This finding is in keeping with the results of several previous studies, which showed that habitual coffee drinking influences blood pressure only marginally.2-3
However, coffee and cigarettes have been shown to have an interactive effect on blood pressure under laboratory conditions.4 Drinking coffee had no significant effect on blood pressure, whereas smoking a single cigarette elevated blood pressure for 15 minutes. However, when smoking and coffee were combined, there was a 10 mm Hg increase in blood pressure that was still present 2 hours later. In a population study, daytime blood pressure was only marginally affected by coffee drinking.3 However, there was a significant interaction between smoking and coffee use on ambulatory blood pressure. Average daytime blood pressure . . . [Full Text of this Article]
Paolo Palatini, MD
palatini@unipd.it
University of Padova
Padova, Italy
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