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Related Concept Videos

Cardiac Output and Stroke Volume01:11

Cardiac Output and Stroke Volume

4.0K
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...
4.0K
Cardiac Output II: Effect of Stroke Volume on Cardiac Output01:22

Cardiac Output II: Effect of Stroke Volume on Cardiac Output

2.5K
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...
2.5K
Cardiac Output I:Effect of Heart Rate on Cardiac Output01:19

Cardiac Output I:Effect of Heart Rate on Cardiac Output

2.0K
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...
2.0K
Exercise and Cardiac Output01:17

Exercise and Cardiac Output

1.6K
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...
1.6K
Imbalances in Cardiac Output01:26

Imbalances in Cardiac Output

2.0K
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...
2.0K
Cardiomyopathy V: Interprofessional Care01:29

Cardiomyopathy V: Interprofessional Care

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Managing cardiomyopathy involves addressing underlying or precipitating causes, treating heart failure with medications, and implementing dietary changes and a balanced exercise and rest regimen.Lifestyle ModificationsCardiomyopathy patients should adopt a low-sodium diet to reduce fluid retention and manage heart failure. A personalized exercise and rest plan helps maintain physical fitness without overstraining the heart. Avoiding alcohol and tobacco is essential to prevent further damage to...
128

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Related Experiment Video

Updated: Nov 25, 2025

Transthoracic Echocardiography to Assess Post-Resuscitation Left Ventricular Dysfunction After Acute Myocardial Infarction and Cardiac Arrest in Pigs
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Cardiac Output Estimation: Online Implementation for Left Ventricular Assist Device Support.

Anastasios Petrou, Menelaos Kanakis, Konstantinos Magkoutas

    IEEE Transactions on Bio-Medical Engineering
    |December 18, 2020
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a new method to estimate cardiac output (CO) in patients with ventricular assist devices (VADs) using pump signals. The pipeline accurately measures CO, offering crucial data for VAD therapy improvement.

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    Utilizing Percutaneous Ventricular Assist Devices in Acute Myocardial Infarction Complicated by Cardiogenic Shock
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    Area of Science:

    • Biomedical Engineering
    • Cardiovascular Technology
    • Artificial Organs

    Background:

    • Ventricular assist devices (VADs) are crucial for end-stage heart failure treatment.
    • Accurate monitoring of cardiac output (CO) is essential for optimizing VAD therapy.
    • Current CO estimation methods in VAD patients can be invasive or complex.

    Purpose of the Study:

    • To develop and validate a novel pipeline for estimating cardiac output (CO) in patients supported by VADs.
    • To utilize a single pump inlet pressure (PIP) sensor and pump intrinsic signals for CO estimation.
    • To assess the performance of machine learning and Kalman-filter based estimators.

    Main Methods:

    • A machine learning (ML) model was developed to predict aortic valve opening status.
    • CO estimation involved differentiating between closed and open aortic valve scenarios.
    • A Kalman-filter approach was used to estimate aortic valve flow when the valve was open.

    Main Results:

    • The ML model achieved a Matthews correlation coefficient of 0.771, sensitivity of 0.913, and specificity of 0.871.
    • The overall CO estimation achieved a root mean square error (RMSE) of 0.69 L/min.
    • Potential for RMSE reduction below 0.5 L/min by replacing specific estimators with sensors.

    Conclusions:

    • The proposed pipeline represents a state-of-the-art approach for CO estimation in VADs with integrated PIP sensors.
    • Individual estimator performance was analyzed, identifying limitations for future research.
    • The findings support improved VAD therapy through enhanced clinical information on heart-VAD interaction.