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Measurement of systolic time intervals during exercise using inductive plethysmography
International Journal of Clinical Monitoring and Computing
|January 1, 1984
Summary
A new carotid arterial pulse transducer (CIP) effectively measures systolic time intervals (STI) during exercise, reducing motion artifacts. This noninvasive method provides reliable cardiac function assessment, complementing pulmonary testing.
Area of Science:
- Cardiology
- Biomedical Engineering
- Exercise Physiology
Background:
- Systolic time intervals (STI) noninvasively assess cardiac function.
- Motion artifacts commonly limit STI measurements during exercise.
Purpose of the Study:
- To introduce and evaluate a new lightweight carotid arterial pulse transducer (CIP) for improved STI measurement during exercise.
- To minimize motion artifacts using computerized signal averaging.
Main Methods:
- Compared CIP with a standard funnel-shaped cup (CUP) transducer in 12 subjects at rest and during graded exercise.
- Utilized computerized signal averaging of EKG, phonocardiogram, and carotid pulse (CIP or CUP) over 16-32 heartbeats.
- Semi-automatically analyzed averaged signals for left ventricular ejection time (LVET), pre-ejection period (PEP), and electromechanical systole (QS2).
Main Results:
- Computerized signal averaging significantly reduced motion artifacts for both methods.
- CIP-derived LVET values were within 10% of CUP values; 85% of PEP values were within 20%.
- Exercise induced expected decreases in QS2, LVET, and PEP, indicating increased myocardial contractility.
Conclusions:
- The new CIP transducer offers a comfortable and accurate method for measuring STI during exercise.
- This technique provides valuable, noninvasive cardiac function data, complementing exercise pulmonary testing.