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 happen to contract simultaneously, the right atrium contracts against a closed tricuspid valve, resulting in back pressure into the venous system that can be seen in the jugular venous pulse as a high-amplitude "cannon wave".[1][2] It is associated with heart block, in particular third-degree (complete) heart block.[3] It is also seen in pulmonary hypertension.[3] Cannon A waves may also be seen in ventricular tachycardia due to the inherent AV dissociation of the arrhythmia.[citation needed]
This wave will cause pulsation in the neck and abdomen, headache, cough, and jaw pain.[2]
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Jugular Venous Pressure, Animation
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What are cannon A-waves?
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EASY WAYS TO REMEMBER JVP WAVEFORM
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References
- ^ "cannon A waves - definition of cannon A waves in the Medical dictionary - by the Free Online Medical Dictionary, Thesaurus and Encyclopedia".
- ^ a b "Pacemaker Syndrome: Overview - eMedicine Cardiology".
- ^ a b Sam, Amir H.; James T.H. Teo (2010). Rapid Medicine. Wiley-Blackwell. ISBN 978-1-4051-8323-9.
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This page was last edited on 15 October 2021, at 11:29