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Changes in cardiac function during and after pregnancy expressed by systolic time intervals
Acta Obstetricia Et Gynecologica Scandinavica
|January 1, 1976
Summary
Systolic Time Intervals (STI) reveal significant hemodynamic changes during pregnancy and postpartum. These non-invasive measurements offer crucial cardiac function insights, surpassing traditional heart rate and blood pressure monitoring.
Area of Science:
- Cardiovascular Physiology
- Reproductive Medicine
- Maternal-Fetal Medicine
Background:
- Pregnancy induces substantial physiological adaptations, including significant cardiovascular changes.
- Understanding hemodynamic alterations during gestation and puerperium is crucial for maternal health.
- Traditional monitoring of heart rate and blood pressure may not fully capture cardiac function changes.
Purpose of the Study:
- To evaluate hemodynamic changes during pregnancy (first and third trimesters) and the early puerperium.
- To assess the utility of non-invasive Systolic Time Intervals (STI) in monitoring cardiac function.
- To compare STI findings with heart rate and blood pressure measurements.
Main Methods:
- Non-invasive measurement of Systolic Time Intervals (STI), including Pre-ejection Period (PEP) and Left Ventricular Ejection Time (LVET).
- Measurements were taken in both supine and left lateral positions.
- Evaluations were conducted during the first and third trimesters of pregnancy and the first week postpartum.
Main Results:
- Significant shortening of PEP and QS2 (electromechanical systole), with increased PEP/LVET ratio in the third trimester (supine), attributed to inferior vena cava compression.
- In the lateral position during the third trimester, QS2 and LVET lengthened, while PEP and P/L ratio decreased, relieving uterine pressure.
- Heart rate increased in late pregnancy and postpartum; arterial blood pressure showed minor changes. STI provided more detailed cardiac function information than HR and BP.
Conclusions:
- Systolic Time Intervals (STI) effectively characterize hemodynamic adaptations during pregnancy and the puerperium.
- STI measurements provide more comprehensive insights into cardiac function changes than heart rate and blood pressure alone.
- STI offers a safe, non-invasive, and repeatable method for monitoring cardiac function in pregnant and postpartum individuals.