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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

3.2K
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...
3.2K
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...
2.5K
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...
2.5K
Cardiac Output and Stroke Volume01:11

Cardiac Output and Stroke Volume

4.6K
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...
4.6K
Regulation of Water Output01:26

Regulation of Water Output

2.0K
The human body predominantly expels water through the urinary system. On average, an individual generates around 1.5 liters of urine each day. This amount can fluctuate based on how well a person is hydrated, but a critical minimum quantity of urine must be produced to ensure the body's proper functioning. Daily, the kidneys remove 600 to 1200 milliosmoles of dissolved substances, effectively excreting excess minerals and water-soluble toxins such as creatinine, urea, and uric acid from the...
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Related Experiment Video

Updated: Jan 25, 2026

Author Spotlight: Assessment of Cardiac Output Calculation by Thermodilution in Pigs for Effective Perfusion Flow During EVLP
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Author Spotlight: Assessment of Cardiac Output Calculation by Thermodilution in Pigs for Effective Perfusion Flow During EVLP

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Measuring cardiac output at the bedside.

Stephen J Huang1

  • 1Department of Intensive Care Medicine, Nepean Hospital, The University of Sydney, Sydney, New South Wales, Australia.

Current Opinion in Critical Care
|April 26, 2019
PubMed
Summary
This summary is machine-generated.

Accurate bedside cardiac output (CO) measurement is crucial for diagnosing shock and managing fluids. Devices using physical principles are more reliable for diagnosis than those relying on mathematical models, which show limited accuracy.

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Area of Science:

  • Critical care medicine
  • Hemodynamics
  • Medical device technology

Background:

  • Bedside cardiac output (CO) measurement is essential for hemodynamic monitoring.
  • Accurate CO assessment aids in diagnosing circulatory shock and guiding fluid management.
  • Various devices exist for determining CO, each with distinct principles and limitations.

Purpose of the Study:

  • To review the significance of cardiac output (CO) or stroke volume (SV) measurement.
  • To discuss the diverse methods and devices employed for CO determination.

Main Methods:

  • Classification of CO measurement devices into two categories: those based on simple physical principles and those using mathematical modeling.
  • Evaluation of the accuracy, reliability, and monitoring capabilities of different CO measurement techniques.
  • Review of recent data on the performance of devices based on mathematical modeling.

Main Results:

  • Devices using simple physical principles are generally more accurate but may lack continuous monitoring.
  • Devices employing mathematical modeling offer continuous monitoring but often have limited accuracy and precision.
  • Recent data indicate that devices based on mathematical modeling exhibit poor accuracy and precision.

Conclusions:

  • CO or SV measurement is vital in critically ill patients.
  • Most available devices present challenges regarding accuracy and reliability.
  • The selection of a CO measurement device should align with the specific clinical purpose, favoring devices based on physical principles like thermodilution and transthoracic echocardiography for diagnostic accuracy.