Physiological responses to prompt and sustained squatting. Measurement by systolic time intervals.
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چکیده
منابع مشابه
Systolic time intervals in measurement of inotropic response to drugs.
During periods of tachycardia induced by atrial pacing in eight patients, moderate increments in dP/dt(max) and (dP/dt)/CPIP (common produced intraventricular pressure) and moderate reductions in left ventricular ejection time (LVET) and Q-S2 were demonstrated. These changes varied between individuals, but reduction in systolic intervals was consistently less than that reported from populations...
متن کاملSystolic time intervals by echocardiography.
Technical difficulties in recording phonocardiogram or indirect carotid pulse occasionally preclude determination of the systolic time intervals. Accordingly, an alternative method was tested in 52 patients, using high-speed strip chart recording of the aortic valve echocardiogram. Satisfactory records were obtained in 36. The interval from opening to closing of the aortic valve (ejection time)...
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Objective- to determine the range of systolic times intervals using Pulsed-wave Doppler and m-mode echocardiography in normal, healthy Great Dane dogs. Design- Descriptive study. Animals- Thirty healthy Great Dane dogs. Procedures- This study examined 30 clinically healthy Great Dane dogs by the twodimensional, M-mode and Pulsed-wave Doppler echocardiography. The dogs were awake and unsedated. ...
متن کاملLeft Ventricular Systolic Time Intervals
The effects of graded increments of passive head-up tilt on the duration of the systolic time intervals corrected for heart rate were investigated in 15 normal subjects. Head-up tilt caused a prolongation of the pre-ejection period and a shortening of the left ventricular ejection time, while total electromechanical systole diminished minimally. The lengthening of the pre-ejection period and ab...
متن کاملMeasurement of right and left ventricular systolic time intervals by echocardiography.
One of the noninvasive methods of evaluating left ventricular performance is the measurement of left ventricular systolic time intervals (LVSTI). However, noninvasive measurement of right ventricular systole by this technique has been unreliable because of the inability to accurately time the onset of right ventricular ejection. Excellent correlation of LVSTI measured from the carotid pulse and...
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ژورنال
عنوان ژورنال: Heart
سال: 1977
ISSN: 1355-6037
DOI: 10.1136/hrt.39.5.559