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Related Concept Videos

Regulation of Stroke Volume01:27

Regulation of Stroke Volume

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The regulation of stroke volume, which is the amount of blood the heart pumps out during each heartbeat, is critical for maintaining a healthy circulatory system. Stroke volume is influenced by three main factors: preload, contractility, and afterload.
Preload refers to the degree of stretch on the heart before it contracts. It's analogous to the stretching of a rubber band; the more it's stretched, the more forcefully it snaps back. This concept is encapsulated in the Frank-Starling law of the...
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Cardiac Output II: Effect of Stroke Volume on Cardiac Output01:22

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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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Exercise and Cardiac Output01:17

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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.
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Pathophysiology of Cardiac Performance01:29

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Typical heart performance is influenced by heart rate, rhythm, myocardial contraction, and metabolism or blood flow. The cardiac muscle exhibits distinct electrophysiological features, including pacemaker activity and calcium channel control, which play a vital role in the heart's response to various drugs. The autonomic nervous system, comprising the sympathetic and parasympathetic branches, regulates heart rate. Sympathetic activation increases heart rate, while parasympathetic activation...
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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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Physiology of the Heart: The Cardiac Cycle01:18

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The cardiac cycle describes the events from one heartbeat to the next. It includes three main phases: diastole, atrial systole, and ventricular systole, all driven by changes in chamber pressures and the function of heart valves.
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Systolic Function in the Fontan Circulation Is Exercise, but Not Preload, Recruitable.

Simone Goa Diab1, Assami Rösner2, Gaute Døhlen3

  • 1Department of Paediatric Cardiology, Oslo University Hospital, Rikshospitalet, Oslo, Norway; Faculty of Medicine, Institute of Clinical Medicine, University of Oslo, Oslo, Norway.

Journal of the American Society of Echocardiography : Official Publication of the American Society of Echocardiography
|November 16, 2024
PubMed
Summary

Adolescent Fontan circulation patients show improved systolic function with exercise, but not with increased fluid load. This highlights exercise as a way to recruit myocardial functional reserve in Fontan patients.

Keywords:
Exercise echocardiographyFontan circulationMyocardial functionMyocardial peak longitudinal strainPreload challenge

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Area of Science:

  • Cardiology
  • Pediatric Cardiology
  • Cardiovascular Physiology

Background:

  • Fontan circulation is associated with impaired systolic function, but underlying mechanisms remain unclear.
  • Understanding myocardial functional reserve is crucial for managing Fontan-associated circulatory failure.
  • This study investigates myocardial response to different physiological stresses in adolescents with Fontan circulation.

Purpose of the Study:

  • To explore myocardial functional reserve in adolescent Fontan patients.
  • To assess the response of myocardial function to acute exercise stress.
  • To evaluate the impact of acute preload increase on myocardial function.

Main Methods:

  • 32 adolescent Fontan patients underwent echocardiography during exercise and acute volume loading.
  • Myocardial peak longitudinal strain (LS) was measured during exercise (LSstress) and saline infusion (LScath).
  • Central venous pressure and ventricular end-diastolic pressure were recorded during catheterization; 16 healthy individuals served as controls for exercise testing.

Main Results:

  • Fontan patients showed reduced LS during exercise compared to controls, but LSstress improved significantly with maximal loading.
  • LSstress did not correlate with heart rate changes.
  • LS during acute volume loading (LScath) did not improve significantly and worsened in over half of patients, correlating with elevated pressures.

Conclusions:

  • Adolescent Fontan patients exhibit recruitable systolic myocardial functional reserve with exercise.
  • Acute preload increase does not effectively recruit myocardial functional reserve in Fontan circulation.
  • Findings suggest distinct mechanisms of myocardial response to different hemodynamic challenges in Fontan physiology.