Cannon a waves

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

Synonyms and keywords: Cannon A waves; Cannon A wave; Cannon a waves; Cannon a wave; Cannon atrial waves; Canon a waves

Overview

Cannon a waves are waves seen occasionally in the jugular vein of humans with certain cardiac arrhythmias. When the atria and ventricles contract simultaneously, or when the right atrium contracts against a closed tricuspid valve, the blood will be pushed against the AV valve, and a very large retrograde pressure wave travels up the jugular vein.

Diagnosis

Symptoms

The following may be present:

• Cough
• Headache
• Jaw pain

Physical Examination

Neck

This wave will cause pulsation in the neck and abdomen.

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Causes

• Complete heart block
• Junctional rhythms
• Pacemaker syndrome
• Pulmonary hypertension
• Ventricular tachycardia