Related Experiment Video
Updated: May 20, 2026
07:54
Assessment of Ex Vivo Murine Biventricular Function in a Langendorff Model
Published on: December 23, 2022
[Study on the changes of cardiac reserve function during normal vaginal delivery]
Yan-wei Lin1, Yong Shao, Jian-hua Zhang
1Department of Obstetrics and Gynecology, Chongqing Medical University, Chongqing, China.
Zhonghua Fu Chan Ke Za Zhi
|July 12, 2012
Summary
Maternal cardiac reserve function declines during labor contractions and the second stage, recovering postpartum. Heart rate and S1/S2 ratio increase, while D/S ratio decreases as labor progresses.
Area of Science:
- Cardiology
- Obstetrics
- Physiology
Context:
- Normal labor involves significant physiological changes.
- Monitoring maternal cardiac function is crucial during childbirth.
- Cardiac reserve reflects the heart's ability to adapt to stress.
Purpose:
- To investigate the trends in maternal cardiac reserve function throughout normal labor.
- To analyze changes in heart rate (HR), S1/S2 ratio, and D/S ratio during uterine contractions and relaxations.
- To assess the progression of cardiac reserve function across different labor stages.
Summary:
- Cardiac reserve function was assessed in 63 women using digital heart sound signal processing.
- Maternal cardiac reserve function decreased during uterine contractions compared to relaxations.
- A decline in cardiac reserve was observed with labor progression, most notably in the second stage, with recovery postpartum.
Impact:
- Provides insights into the cardiovascular adaptations during normal labor.
- Highlights the increased cardiac workload during uterine contractions.
- Suggests potential for monitoring maternal well-being through cardiac reserve assessment.
Related Concept Videos
01:22Cardiac Output II: Effect of Stroke Volume on Cardiac Output
Cardiac output (CO), the amount of blood the heart pumps per minute, is a parameter in cardiovascular physiology determined by stroke volume and heart rate. Stroke volume, the amount of blood pushed from one of the ventricles per heartbeat, is influenced by preload, afterload, and contractility.
Preload
Preload refers to the initial elongation of the cardiac myocytes before contraction and is related to the volume of blood filling the heart at the end of diastole, or end-diastolic volume. The...
Preload
Preload refers to the initial elongation of the cardiac myocytes before contraction and is related to the volume of blood filling the heart at the end of diastole, or end-diastolic volume. The...
01:19Cardiac Output I:Effect of Heart Rate on Cardiac Output
Cardiac Output
Cardiac output (CO) refers to the total amount of blood ejected by one of the ventricles in liters per minute (L/min). In a resting adult, CO ranges from 5 to 6 L/min, adjusting according to the body's metabolic requirements.
Effect of Heart Rate on Cardiac Output
Cardiac output adapts to metabolic demands during stress, physical activity, or illness. The autonomic nervous system regulates heart rate via the sinoatrial node. The parasympathetic nervous system decreases heart rate...
Cardiac output (CO) refers to the total amount of blood ejected by one of the ventricles in liters per minute (L/min). In a resting adult, CO ranges from 5 to 6 L/min, adjusting according to the body's metabolic requirements.
Effect of Heart Rate on Cardiac Output
Cardiac output adapts to metabolic demands during stress, physical activity, or illness. The autonomic nervous system regulates heart rate via the sinoatrial node. The parasympathetic nervous system decreases heart rate...
01:11Cardiac Output and Stroke Volume
Cardiac output (CO) is an integral aspect of human physiology, reflecting the heart's efficiency and responsiveness to the body's needs. It represents the volume of blood that the left or right ventricle ejects into the aorta or pulmonary trunk each minute. The CO is calculated by multiplying the heart rate (HR)—the number of heartbeats per minute—by the stroke volume (SV)—the amount of blood pumped out with each heartbeat.
In an average resting adult male, the typical cardiac output averages...
In an average resting adult male, the typical cardiac output averages...