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Cardiac systolic time intervals in fetal monkeys: pre-ejection period
American Journal of Obstetrics and Gynecology
|October 1, 1978
Summary
The fetal pre-ejection period (PEP) is a key indicator of cardiac performance. Factors like heart rate, blood pressure, and pH significantly influence PEP, offering insights into fetal cardiovascular health.
Area of Science:
- Cardiovascular Physiology
- Fetal Medicine
- Neonatal Cardiology
Background:
- Systolic time intervals (STIs) offer insights into cardiac function.
- The fetal pre-ejection period (PEP) is a crucial STI.
- Understanding PEP regulation is vital for assessing fetal well-being.
Purpose of the Study:
- To investigate the determinants of fetal cardiac systolic time intervals.
- To evaluate the pre-ejection period (PEP) as an indicator of fetal cardiac performance.
Main Methods:
- Simultaneous electrocardiogram (ECG) and Doppler cardiogram (DCG) recordings in fetal rhesus monkeys.
- Measurements were taken under physiological conditions and during experimental stresses.
- Analysis of the pre-ejection period (PEP) in relation to heart rate, blood pressure, pH, and interventions.
Main Results:
- Fetal PEP was not significantly related to heart rate in unstressed fetuses.
- PEP shortened with epinephrine-induced heart rate acceleration.
- PEP correlated inversely with left ventricular end-diastolic pressure and pulse pressure.
- PEP showed positive correlation with systolic and diastolic arterial blood pressure.
- A strong negative correlation was found between PEP and arterial blood pH.
- PEP increased slightly during nonacidemic hypoxemia.
- Epinephrine significantly shortened PEP, while atropine's effect was inconsistent.
Conclusions:
- The fetal pre-ejection period (PEP) is a sensitive indicator of cardiac performance.
- PEP reflects both myocardial contractility and the overall hemodynamic state.
- PEP's relationship with various physiological parameters highlights its clinical utility in fetal assessment.