Measurement of systolic time intervals during exercise using inductive plethysmography

作者: Chris Jordan , Kathe Henke , Andrew Stone , Luis Brandwayn , Anne Belsito

DOI: 10.1007/BF01872763

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摘要: Measurement of systolic time intervals (STI) provides a noninvasive assessment cardiac function in resting subjects. However, large motion artifacts often limit their application during exercise. To improve such measurements, we employed new lightweight carotid arterial pulse transducer and minimized the by computerized signal averaging. The was recorded with an inductive plethysmographic band (CIP) wrapped around neck. STI derived from these measurements were compared to standard funnel-shaped cup attached neck connected pressure (CUP) 12 normal subjects at rest graded bicycle ergometry. compare techniques, CIP CUP signals, together EKG phonocardiogram, separately two microcomputer systems. systems triggered averaged signals over 16 or 32 heart beats. Semi-automatic analysis provided estimates left ventricular ejection (LVET), pre-ejection period (PEP) electromechanical systole (QS2). Motion artifact levels unprocessed similar both methods but greatly reduced All LEVT values using fell within 10% values. 85% PEP 20% Increasing exercise loads produced appropriate decreases QS2, LVET, PEP/LVET consistent increased myocardial contractility. proved comfortable wear did not require critical positioning as CUP. complements pulmonary testing useful information function.

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