This Article  • References  • Full text PDF  • Send to a friend  • Save in My Folder  • Save to citation manager  • Permissions  Citing Articles  • Contact me when this article is cited  Related Content  • Similar articles in JAMA  Social Bookmarking   What's this?

Ravi Prakash, MD

JAMA. 1978;240(25):2732.

	Since this article does not have an abstract, we have provided the first 150 words of the full text PDF and any section headings.

To the Editor.—

I would like to make the following comments about the production of A2.

Leatham¹ recorded phonocardiograms and external carotid pulse tracings in ten healthy persons and concluded that the origin of the first component of S2 is associated with aortic valve closure by its relationship to the dicrotic notch. Although the foregoing hypothesis has been generally accepted, several investigators have reported that the first component of S2 precedes aortic valve closure by 5 to 30 ms.^2-4

To clarify this controversy regarding the relationship between the aortic valve closure and the first component of S2, we conducted a study on 20 subjects (Geriatrics 26: 372-374, 1978). Simultaneous phono-cardiograms, ECGs, and echocardiograms were recorded on a strip-chart recorder. The points of separation and closure of the echoes of the two cusps of the aortic valve were considered to be the aortic opening and closing points, respectively. The . . . [Full Text PDF of this Article]

CiteULike    Connotea    Del.icio.us    Digg    Reddit    Technorati    Twitter     What's this?