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Preload matters: visualizing fluid responsiveness by TEE during hypovolemic cardiac arrest

Chia-Ching Chen1, Wan-Ching Lien2,3

  • 1Department of Emergency Medicine, Chang Bing Show-Chwan Memorial Hospital, Changhua, Taiwan.

Internal and Emergency Medicine
|August 9, 2025
PubMed
Summary

No abstract available in PubMed .

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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.
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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.
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