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Related Concept Videos

Cardiac Output and Stroke Volume01:11

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

Cardiac 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...
Imbalances in Cardiac Output01:26

Imbalances in Cardiac Output

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

Cardiac 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...
Pulse01:05

Pulse

The pulse is one of the most fundamental physiological indicators of the body's cardiovascular health. It is the rhythmic expansion and contraction of the arterial walls in response to the pressure generated by the heart's pumping action.
Pulse Rate and its Significance
Pulse rate, often measured in beats per minute (bpm), reflects the heart rate (HR), which is influenced by numerous factors such as stress, physical activity, and hormonal changes. A normal resting adult pulse rate falls between...

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Related Experiment Video

Updated: Jul 7, 2026

Assessment of Pulmonary Capillary Blood Volume, Membrane Diffusing Capacity, and Intrapulmonary Arteriovenous Anastomoses During Exercise
07:09

Assessment of Pulmonary Capillary Blood Volume, Membrane Diffusing Capacity, and Intrapulmonary Arteriovenous Anastomoses During Exercise

Published on: February 20, 2017

Cardiac output using the saline-dilution impedance technique.

L A Geddes1

  • 1Center for Biomed. Eng., Purdue Univ., West Lafayette, IN.

IEEE Engineering in Medicine and Biology Magazine : the Quarterly Magazine of the Engineering in Medicine & Biology Society
|January 1, 1989
PubMed
Summary

Saline indicator-dilution method accurately measures cardiac output using electrical calibration. This cost-effective technique with advanced electrodes is suitable for clinical applications.

Related Experiment Videos

Last Updated: Jul 7, 2026

Assessment of Pulmonary Capillary Blood Volume, Membrane Diffusing Capacity, and Intrapulmonary Arteriovenous Anastomoses During Exercise
07:09

Assessment of Pulmonary Capillary Blood Volume, Membrane Diffusing Capacity, and Intrapulmonary Arteriovenous Anastomoses During Exercise

Published on: February 20, 2017

Area of Science:

  • Cardiovascular physiology
  • Medical instrumentation
  • Diagnostic techniques

Background:

  • The indicator-dilution method is a key technique for measuring cardiac output.
  • Accurate cardiac output measurement is crucial for diagnosing and managing various cardiovascular conditions.
  • Previous methods faced limitations in accuracy, cost, or invasiveness.

Purpose of the Study:

  • To evaluate the efficacy of the saline indicator-dilution method for accurate cardiac output measurement.
  • To describe the technique of electrical calibration for dilution curves.
  • To present saline as the optimal indicator for cardiac output determination.

Main Methods:

  • Utilized the indicator-dilution principle with saline as the indicator.
  • Employed electrical calibration techniques for the dilution curve.
  • Described the use of two types of electrodes for curve measurement.
  • Introduced a catheter-tip, tetrapolar electrode array in the pulmonary artery for measurements.
  • Administered saline indicator into the right atrium via the same catheter.

Main Results:

  • Saline was identified as the most suitable indicator for cardiac output measurements.
  • Electrical calibration of the saline-dilution curve was successfully demonstrated.
  • Verification studies confirmed the high accuracy of the method.
  • The combined technique offers a cost-effective solution.

Conclusions:

  • The saline indicator-dilution method, particularly with the described catheter-tip electrode array and electrical calibration, provides highly accurate cardiac output measurements.
  • This method presents a cost-effective and accurate alternative for clinical use.
  • Further adoption in clinical settings is recommended due to its proven efficacy and economic advantages.