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Chapter: Clinical Cases in Anesthesia : Aortic Stenosis

Why is it important to maintain sinus rhythm?

Atrial systole normally contributes about 15–20% to stroke volume. In AS, this increases to 40–50%.

Why is it important to maintain sinus rhythm?

 

Atrial systole normally contributes about 15–20% to stroke volume. In AS, this increases to 40–50%. The atrial “kick” is crucial in preserving left ventricular filling (and stroke volume) since passive filling is decreased because of the noncompliant left ventricle. The onset of a non-sinus rhythm is often associated with marked hypotension because of the decrease in stroke volume. It is difficult for the patient with AS to compensate for the loss of sinus rhythm because marked increases in left atrial pressure would be required to maintain an adequate stroke volume.

 

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Clinical Cases in Anesthesia : Aortic Stenosis : Why is it important to maintain sinus rhythm? |


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