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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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Disorders affecting blood volume, vascular tone, or vascular function can disrupt vascular homeostasis, including conditions like hypertension, hemorrhage, and shock.
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Systolic Heart Failure and Compensatory MechanismsSystolic heart failure (also termed HFrEF, Heart Failure with Reduced Ejection Fraction) is the most prevalent type of heart filure. It results in a decreased volume of blood being pumped from the ventricle. The aortic arch and carotid sinuses have baroreceptors that detect reduced blood pressure, triggering the sympathetic nervous system (SNS) to release epinephrine and norepinephrine. Initially, this response aims to boost heart rate and...
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Updated: Apr 30, 2026

Use of a Percutaneous Ventricular Assist Device/Left Atrium to Femoral Artery Bypass System for Cardiogenic Shock
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Ventriculoarterial decoupling in human septic shock.

Fabio Guarracino, Baldassare Ferro, Andrea Morelli

    Critical Care (London, England)
    |April 26, 2014
    PubMed
    Summary
    This summary is machine-generated.

    Septic shock patients often show impaired ventriculoarterial coupling, indicated by an elevated Ea/Ees ratio. This decoupling suggests potential benefits from therapies targeting the normalization of this cardiovascular efficiency metric.

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    Area of Science:

    • Cardiology
    • Intensive Care Medicine
    • Physiology

    Background:

    • Septic shock, a severe sepsis complication, involves hypotension and multiorgan dysfunction.
    • Cardiac dysfunction is common in septic shock and impacts patient outcomes.
    • Ventriculoarterial coupling (Ea/Ees ratio) assesses heart-circulation interaction.

    Purpose of the Study:

    • To analyze ventriculoarterial coupling in intensive care unit (ICU) patients with and without septic shock.
    • To determine the prevalence of ventriculoarterial decoupling in septic shock.

    Main Methods:

    • Retrospective study of 50 ICU patients (25 septic shock, 25 control).
    • Hemodynamic data and transthoracic echocardiograms were used.
    • Arterial elastance (Ea) and left ventricular end-systolic elastance (Ees) were measured; Ea/Ees ratio calculated.

    Main Results:

    • 21 of 25 septic shock patients (group S) had an uncoupled Ea/Ees ratio (>1.36).
    • Septic shock patients with uncoupled ratios had lower EesSB than coupled patients (P=0.007).
    • Five control patients (group C) showed uncoupled Ea/Ees ratios.

    Conclusions:

    • Septic shock patients frequently exhibit significant ventriculoarterial decoupling upon ICU admission.
    • This decoupling is linked to impaired left ventricular performance.
    • Therapies aimed at normalizing the Ea/Ees ratio may benefit septic patients.