Stroke volume (SV)

Joshua Klemt

edited by

Julius Loges,

1. Definition

Stroke volume (SV) refers to the amount of blood pumped out of the left ventricle during the heart’s contraction phase, known as systole.

2. Calculation

Stroke volume (SV) is calculated using the formula:

SV = End-Diastolic Volume (EDV) − End-Systolic Volume (ESV)

The typical stroke volume is approximately 70 to 100 milliliters and can readily increase to approximately 100 to 140 milliliters and even higher during periods of physical exertion.

3. Influencing Factors

The stroke volume (SV) is influenced by several factors:

Preload: increasing preload can increase SV because the myocardium expands more at a higher end-diastolic volume with proper ventricular compliance.

Contractility: Higher contractility increases SV by increasing myocardial contractions.

Afterload: Higher total peripheral resistance (TPR) and aortic pressure can decrease SV by increasing the force required to eject blood.

Heart rate: Although a very high heart rate does not directly affect SV, it can shorten the diastolic filling time and worsen coronary perfusion.

Together, these factors determine the volume of blood that the heart pumps with each beat. An augmentation in stroke volume affects cardiac output.

Was this article helpful?

Specialty

Keywords

Last edit:

2024-12-26 19:23:46

Important Notice

The content provided in DocAtlas is intended solely for educational and informational purposes. It is not a guide for diagnosis, treatment, or medical decision-making. As an open platform, the information in DocAtlas may be subject to inaccuracies, errors, or omissions, and it is important to review and cross-check all content with other reputable sources before making any medical or clinical decisions.

The material in DocAtlas does not replace professional medical advice, diagnosis, or treatment from qualified healthcare providers. Users should consult with their doctor, pharmacist, or other healthcare professionals for specific advice tailored to their individual conditions.

DocAtlas and its authors make no warranties regarding the completeness, accuracy, or reliability of the information contained within and are not liable for any harm, damage, or adverse effects arising from the use or misuse of the content. Users are responsible for ensuring that they verify and critically evaluate all information before applying it in any medical or clinical context.