SUMMARY The diagnostic echocardiographic features of transposition of the great arteries have been described as (1) abnormal great vessel relations, (2) reversed systolic time intervals. The former has been shown to be unreliable and the systolic time intervals have not been critically evaluated in the neonate. A cardiac opinion was sought in 17 cyanotic neonates, aged 7 to 80 hours in whom ful...

To determine the effect of respiration on systolic and diastolic time intervals, simultaneous phonocardiograms, carotid pulse tracings, M mode echocardiograms, and respiratory curve tracings were measured in 25 healthy subjects. The positioning of each cardiac cycle in relation to the phase of respiration was assessed and the dependency of heart rate and cardiac time intervals on respiration wa...

to determine the usefulness of the time intervals obtained from the first derivative of apex cardiogram (da/dt) in assessing contraction and relaxation, 20 hemodynamically and angiographical1y investigated patients with coronary artery disease and 29 patients with hypertensive heart disease were studied. as a control group there were used 50 normal subjects. since contraction and relaxation is ...

the turkmen horse is one of the oldest and purest breeds in the world. there is no information with regards to the normal echocardiographic parameters of this horse regarding to cardiac diseases. pulsed-wave (pw) doppler echocardiography was performed on 42 clinically normal 3- to 15-year-old racing turkmen horses. there were 26 stallions and 16 mares. the left ventricular isovolumetric contrac...

1. Mason, DT: Usefulness and limitations of rate of rise of intraventricular pressure (dp/dt) in evaluation of myocardial contractility in man. Am J Cardiol 23: 516, 1969 2. Spodick SH, Kumar S: Isovolumic contraction period of the left ventricle. Am Heart J 76: 498, 1968 3. Weissler AM, Lewis RP, Leighton RF: The systolic time intervals as a measure of left ventricular performance in man. In P...