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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.
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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

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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.
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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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The Cardiac Cycle01:13

The Cardiac Cycle

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The heart beats rhythmically in a sequence called the cardiac cycle—a rapid coordination of contraction (systole) and relaxation (diastole).
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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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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...
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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...
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Imbalances in Cardiac Output01:26

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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.
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Updated: Feb 7, 2026

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Ambidextrous techniques in cardiac surgery.

Shegu Gilbert1, Devender Singh1, M K Sivakumar2

  • 1Department of cardiothoracic surgery. Kovai medical center and hospital limited. Post box no. 3209, Avanashi road, Coimbatore - 641014, Tamil Nadu, India.

Multimedia Manual of Cardiothoracic Surgery : MMCTS
|August 3, 2018
PubMed
Summary
This summary is machine-generated.

Surgical ambidexterity, the skill of using both hands equally, is crucial for complex procedures like minimally invasive cardiac surgery. Training can begin in medical school to enhance surgical options in constrained spaces.

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Area of Science:

  • Surgical techniques
  • Medical education

Background:

  • Ambidexterity, or equal left and right-hand proficiency, offers significant advantages for surgeons.
  • The level of ambidexterity varies among surgeons, impacting their adaptability in challenging surgical environments.

Purpose of the Study:

  • To highlight the importance of surgical ambidexterity, particularly in laparoscopic and minimally invasive cardiac surgery.
  • To introduce specific ambidextrous surgical techniques and advocate for early training.

Main Methods:

  • Demonstration of the 'all in one hand' technique using two forceps.
  • Explanation of Gilbert's technique for left internal mammary artery harvest.
  • Presentation of a proximal anastomosis technique for aortocoronary bypass procedures.

Main Results:

  • Ambidextrous techniques provide surgeons with enhanced options for critical steps in space-constrained settings.
  • Early initiation of ambidexterity training during medical school is feasible and beneficial.

Conclusions:

  • Surgical ambidexterity is a valuable attribute, especially in minimally invasive cardiac surgery.
  • Specific ambidextrous techniques can be taught and mentored to improve surgical performance and adaptability.