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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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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

Imbalances in Cardiac Output

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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.
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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Introduction Cardiac Emergencies01:30

Introduction Cardiac Emergencies

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Cardiac emergencies are critical situations involving the heart that require immediate medical intervention to prevent severe complications or death. These emergencies often arise from underlying heart conditions that impair the heart's ability to function correctly.Types of Cardiac EmergenciesThe most common types of cardiac emergencies include Acute Coronary Syndrome (ACS), myocardial infarction (MI), cardiac arrest, and heart failure.Acute Coronary Syndrome (ACS)Acute Coronary Syndrome (ACS)...
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Cardiac Output and Stroke Volume01:11

Cardiac Output and Stroke Volume

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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...
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Emergency department non-invasive cardiac output study (EDNICO): an accuracy study.

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Related Experiment Video

Updated: Jan 27, 2026

Author Spotlight: Unveiling Prognostic Indicators in Heart Failure - The Role of Phase Angle and Bioelectrical Impedance Analysis
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Emergency department non-invasive cardiac output study (EDNICO): a feasibility and repeatability study.

D McGregor1, S Sharma2, S Gupta2

  • 1Queen Mary University London and Barts Health NHS Trust, London, UK. david.mcgregor@barsthealth.nhs.uk.

Scandinavian Journal of Trauma, Resuscitation and Emergency Medicine
|March 15, 2019
PubMed
Summary

Non-invasive cardiac output monitoring in the emergency department is feasible with methods like bioreactance. Non-ultrasound techniques showed higher measurement repeatability for assessing fluid responsiveness.

Keywords:
BioreactanceFluid responsivenessPlethysmographySepsisStroke volumeUltrasound

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Area of Science:

  • Emergency Medicine
  • Critical Care
  • Cardiovascular Physiology

Background:

  • Limited data exists on non-invasive cardiac output monitoring in emergency departments (ED).
  • Assessing fluid responsiveness is crucial in ED settings for patient management.
  • Six non-invasive methods were evaluated for feasibility and repeatability.

Purpose of the Study:

  • To assess the feasibility and repeatability of six non-invasive cardiac output monitoring methods in the ED.
  • To compare the performance of different non-invasive techniques for fluid responsiveness assessment.
  • To identify suitable methods for further investigation in ED populations.

Main Methods:

  • Prospective observational study in non-ventilated adult ED patients requiring fluid resuscitation.
  • Feasibility assessed by the proportion of interpretable measurements.
  • Repeatability evaluated by paired measurements after fluid bolus administration.

Main Results:

  • Bioreactance demonstrated the highest feasibility rate (97.6%), significantly higher than other methods.
  • Other methods evaluated included vascular unloading, common carotid artery blood flow, inferior vena cava collapsibility, LVOT VTI, and suprasternal aortic Doppler.
  • Non-ultrasound methods exhibited higher repeatability of measurements.

Conclusions:

  • Selected non-invasive methods are feasible for fluid responsiveness monitoring in the ED.
  • Non-ultrasound techniques offer promising repeatability for cardiac output assessment.
  • Findings support further research into the accuracy and clinical impact of these methods in fluid-depleted ED patients.