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Physiology

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Cardiovascular System

Question
1 out of 6
 

‘C’ wave in JVP is due to: (AIIMS NOV 2007)



A Atrial Contraction

B Bulging of the tricuspid value into the right atrium

C Ventricular diastole when the tricuspid valve is closed

D Ventricular diastole when the tricuspid valve is open

Ans. B Bulging of the tricuspid value into the right atrium

I. The normal JVP reflects phasic pressure changes in the right atrium and consists two or sometimes three positive waves and two negative troughs.

II. The positive presystolic a wave is produced by venous distention due to right atrial contraction and is the dominant wave in the JVP, particularly during inspiration.

III. The c wave often observed in the JVP us a positive wave produced by the bulging of the tricuspid valve into the right atrium during right ventricular is volumetric systole and by the impact of the carotid artery adjacent to the jugular vein.

IV. The x descent is due both to atrial relaxation and to the downward displacement of the tricuspid valve during ventricular systole. The positive late systolic y wave result from the increasing volume of blood in the right atrium during ventricular systole when the tricuspid valve is closed.

V. The y descent of the JVP is produced mainly by the opening of the tricuspid valve and the subsequent rapid inflow of blood into the right ventricle.