Why the study?
Is a properly timed atrial contraction essential for effective closure of the mitral valve in patients with arrhythmias?
Observational (n=43)
Is a properly timed atrial contraction essential for effective closure of the mitral valve in patients with arrhythmias?
Answers are grounded in this paper and cite their sources.
A properly timed atrial contraction is not always essential for effective closure of the mitral valve in humans.
There has been considerable dispute concerning the role of atrial contraction in the closure of the atrioventricular valves. Selective angiocardiograms with left ventricular [see figure in the PDF file] opacification in 43 patients having a variety of arrhythmias that resulted in the absence of atrial systole, or in an abnormal temporal relationship between atrial and ventricular contractions, revealed no evidence of mitral regurgitation. From this observation it is concluded that a properly timed atrial contraction is not always essential for effective closure of the mitral valve in man.
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Braunwald et al. (1966) conducted an observational in Arrhythmias resulting in absence of atrial systole or abnormal temporal relationship between atrial and ventricular contractions (n=43). Absence of atrial systole or abnormal temporal relationship between atrial and ventricular contractions was evaluated on Mitral regurgitation.
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