Second heart sound in normal subjects.
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چکیده
منابع مشابه
Second heart sound in normal subjects.
Splitting of the second heart sound in the pulmonary area into two components was first recognized by Potain (1866). In expiration, the two components fuse, while in inspiration delay of pulmonary valve closure (P2) occurs almost invariably in healthy subjects, enabling identification of aortic valve closure (A2) and P2, and hence comparison of the duration of right and left ventricular systole...
متن کاملThe splitting of the second heart sound in normal subjects and in patients with congenital heart disease.
demonstrated that the second heart sound results from closure of the semilunar valves.1 In 1865, on the basis of clinical observations, Potain indicated that the second heart sound may be split into two components and that the degree of this splitting may vary with respiration.2 More recently the studies of Leatham and collabora-tors3 4 have focused considerable attention on the splitting of th...
متن کاملMechanism of normal splitting of the second heart sound.
The mode of inspiratory augmentation (1A) of the A2-P2 interval was investigated in seven normal volunteers (group 1) and six patients with pulmonary hypertension of diverse etiology (group 2) using catheter-tip micromanometers. In group 1 subjects, inspiratory widening of this interval was found to average 27.2 msec, of which 7.6 plus or minus 2.7 msec (1 sd) or 27 plus or minus 7% was due to ...
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Background: Streptokinase, which is injected intravenously with a standard dose of 1.5 MIU, is the most widely used thrombolytic agent around the world. What is so important about this bioproduct is the level of antistreptokinase (anti-sk) antibody in the population, which is directly correlated to the incidence of streptococcal infections in that population. Objective: Since Iran is an endemic...
متن کاملSound Pressure Correlates of the Second Heart Sound
The sound pressure correlates of the second heart sound were studied in 22 patients during diagnostic cardiac catheterization. Simultaneous right ventricular and pulmonary artery pressures were recorded with equisensitive catheter-tip micromanometers together with the external phonocardiogram and ECG. In 12 patients having normal pulmonary vascular resistance (group 1), pulmonic closure sound w...
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ژورنال
عنوان ژورنال: Heart
سال: 1968
ISSN: 1355-6037
DOI: 10.1136/hrt.30.6.739