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Related Concept Videos

Cardiac Output II: Effect of Stroke Volume on Cardiac Output01:22

Cardiac Output II: Effect of Stroke Volume on Cardiac Output

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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...
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Cardiac Output I:Effect of Heart Rate on Cardiac Output01:19

Cardiac Output I:Effect of Heart Rate on Cardiac Output

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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...
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Cardiac Cycle01:29

Cardiac Cycle

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The cardiac cycle refers to the sequence of events that occur in the heart from the beginning of one heartbeat to the next. It's characterized by alternating periods of contraction (systole) and relaxation (diastole) of the heart muscles.
During the cardiac cycle, blood flow through the heart is regulated entirely by changing pressure gradients. This sequence of events begins with the heart in a state of total relaxation, known as mid-to-late diastole, during which blood passively flows from...
12.4K
The Cardiac Cycle01:13

The Cardiac Cycle

97.9K
The heart beats rhythmically in a sequence called the cardiac cycle—a rapid coordination of contraction (systole) and relaxation (diastole).
The Process
Electrical signals—sent from the sinoatrial (SA) node in the right atrial wall to the atrioventricular (AV) node between the right atrium and right ventricle—cause both atria to simultaneously contract. When the signal reaches the AV node, it pauses for approximately a tenth of a second, allowing the atria to contract and...
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Exercise and Cardiac Output01:17

Exercise and Cardiac Output

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Regular physical activity is essential for maintaining cardiovascular health, with aerobic exercises being particularly effective. According to the American Heart Association, 150 minutes of moderate to intense aerobic exercise per week is recommended for a healthy heart. Aerobic activities may include brisk walking, running, bicycling, cross-country skiing, and swimming, ideally performed three to five times per week.
Sustained exercise increases the muscles' oxygen demand, which can be...
1.9K
Imbalances in Cardiac Output01:26

Imbalances in Cardiac Output

2.5K
The heart's primary function is to pump blood throughout the body, maintaining a balance between blood sent out (cardiac output) and blood returning (venous return). If this balance is disrupted, it can result in congestive heart failure (CHF), a severe condition where the heart becomes an inefficient pump, leading to inadequate blood circulation.
CHF can occur due to the failure of either side of the heart. Left-side failure leads to pulmonary congestion—the right side continues to send...
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Updated: Jan 25, 2026

Normothermic Cardiac Arrest and Cardiopulmonary Resuscitation: A Mouse Model of Ischemia-Reperfusion Injury
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Normothermic Cardiac Arrest and Cardiopulmonary Resuscitation: A Mouse Model of Ischemia-Reperfusion Injury

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Maternal cardiac arrest.

Yigal Helviz1, Sharon Einav1,2

  • 1The Intensive Care Unit of the Shaare Zedek Medical Center.

Current Opinion in Anaesthesiology
|May 3, 2019
PubMed
Summary
This summary is machine-generated.

Maternal cardiac arrest management requires attention to unique causes like anesthesia complications, hemorrhage, and thromboembolism. While similar to adult CPR, specific interventions like left uterine displacement are crucial for better outcomes.

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Area of Science:

  • Cardiology
  • Obstetrics
  • Critical Care Medicine

Background:

  • Anesthesia complications, hemorrhage, and infections are leading causes of maternal cardiac arrest in developed nations.
  • Pregnant women with cardiac or neurological comorbidities require specialized care.
  • Thromboembolic events, though rare, present a significant mortality risk.

Purpose of the Study:

  • To provide a practical clinical guide for managing maternal cardiac arrest.
  • To highlight unique aspects of maternal cardiac arrest diagnosis and treatment.
  • To inform clinicians on specific interventions for improved maternal outcomes.

Main Methods:

  • Review of recent literature and clinical reports on maternal cardiac arrest.
  • Analysis of causes, presenting rhythms, and treatment differences compared to general cardiac arrest populations.
  • Emphasis on diagnostic tools like echocardiography and critical interventions.

Main Results:

  • Maternal cardiac arrest has distinct causes and rhythms compared to other populations.
  • Outcomes for maternal cardiac arrest are generally better than for non-pregnant adults.
  • Key interventions include early airway management, consideration of medication effects, and Left Uterine Displacement (LUD).

Conclusions:

  • Maternal cardiac arrest care should align with general cardiac arrest protocols.
  • Unique reversible causes necessitate tailored diagnostic and treatment strategies.
  • Early delivery within 4-5 minutes may be indicated in specific scenarios to improve maternal survival.