Resting and Exercise Systolic Time Intervals

Resting and exercise systolic intervals.

Resting and exercise systolic time intervals. Correlations with ventricular performance in patients with coronary artery disease.

Indirect systolic time intervals (STI) corrected for heart rate were compared at rest and immediately following 3 minutes of moderate supine exercise in 33 normal subjects and 32 ageand sex-matched patients with coronary artery disease (CAD). The intervals were correlated with measurements of cardiac index (Cl), stroke volume index (SVI), mean pulmonary artery aind wedge pressures obtained unde...

Continuous electrode monitoring of systolic time intervals during exercise.

Current systolic time interval techniques have limited clinical applicability since patient co-operation and attention to the carotid pulse and phonocardiogram transducers are required. Therefore only surface electrodes were used to monitor the electrocardiogram and electrical impedance cardiogram first derivative (dZ/dt) in the acquisition of the timing signals. dZ/dt motion artefacts were eli...

A study of systolic time intervals during uninterrupted exercise.

A method has been developed for obtaining measurements of the systolic time intervals during uninterrupted graded exercise in the upright position on a bicycle ergometer. The method has been applied to 112 subjects divided into 4 groups: two of normal subjects below and above the age of 40, respectively (mean ages 30 and 48 years), and two of patients (mean ages for each about 50 years), both w...

Left 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...