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Cannon A waves, or cannon atrial waves, are waves seen occasionally in the jugular vein of humans with severe cardiac arrhythmia. 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 [1] [2]. It is associated with heart block.

This wave will cause pulsation in the neck and abdomen, headache, cough, and jaw pain [2].

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