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[1][2]. It is associated with heart block, in particular third-degree (complete) heart block. [3] It is also seen in pulmonary hypertension. [4]
This wave will cause pulsation in the neck and abdomen, headache, cough, and jaw pain[2].
Causes
Canon a waves may be present if there is delayed atrial contraction against a closed tricuspid valve:
References
- ↑ "cannon A waves - definition of cannon A waves in the Medical dictionary - by the Free Online Medical Dictionary, Thesaurus and Encyclopedia".
- ↑ 2.0 2.1 "Pacemaker Syndrome: Overview - eMedicine Cardiology".
- ↑ Sam, Amir H. (2010). Rapid Medicine. Wiley-Blackwell. ISBN 1-4051-8323-3. Unknown parameter
|coauthors=ignored (help) - ↑ Sam, Amir H. (2010). Rapid Medicine. Wiley-Blackwell. ISBN 1-4051-8323-3. Unknown parameter
|coauthors=ignored (help)