What does Stroke Volume (SV) refer to in cardiac physiology?

Stroke Volume (SV) is defined as the volume of blood ejected from the heart with each contraction of the ventricles. This measurement is crucial in understanding cardiac efficiency and overall heart function. SV is influenced by several factors, including preload (the degree of stretch of the ventricular walls at the end of filling), afterload (the resistance the heart must work against to eject blood), and myocardial contractility (the strength of the heart's contractions).

Monitoring stroke volume is essential in critical care, as it provides insights into a patient's hemodynamic status and helps guide fluid management and interventions. A decrease in stroke volume can indicate heart dysfunction, fluid loss, or increased resistance, prompting further evaluation and potential treatment. Understanding stroke volume is fundamental for making informed decisions regarding patient care in a critical setting.