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End systolic volume

Revision as of 13:38, 19 April 2014 by Dr. physiol. John Urbas (Talk | contribs)

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German: endsystolisches Volumen

1 Definition

End systolic volume (ESV) is the amount of blood that remains in a ventricle of the heart at the end of systole. The ESV for an average adult male at rest is usually about 50 ml.

2 Physiology

The value of the end systolic volume depends on the arterial blood pressure as well as on the force of ventricular contraction.

The arterial blood pressure — especially in the large arteries leaving the heart — is not only pressure outwards against the arterial walls but also back pressure against the aortic valve and the pulmonary valve exerted by the arterial blood. An increased arterial blood pressure results in higher end systolic volume because of more afterload (more resistance to the outflow of blood from the ventricles).

Contractility of the ventricular muscle can increase (e.g. from increased stimulation of the heart by the sympathetic nervous system), thereby causing more complete ejection of blood from the ventricle and a resultant lower end systolic volume.

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Specialties: Anatomy

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