Cannon a waves

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Overview

Cannon A waves, or cannon atrial waves, are waves seen occasionally in the jugular vein of humans with certain cardiac arrhythmias. When the atria and ventricles contract simultaneously, the blood will be pushed against the AV valve, and a very large pressure wave runs up the vein.

Diagnosis

Symptoms

headache, cough, and jaw pain may be present

Physical Examination

Neck

This wave will cause pulsation in the neck and abdomen.

Causes

Canon a waves may be present if there is delayed atrial contraction against a closed tricuspid valve:

• Junctional rhythms