Cannon A Waves

 • Caused by atrial contracting against a closed tricuspid valve

 • Atrioventricular dissociation

 • The cannon a wave usually occurs intermittently

 • When it is occurs with every beat, it indicates AV dissociation + retrograde atrial activation from SVT (e.g., junctional rhythm)



Dr. André Mansoor @AndreMansoor - Author of Frameworks for Internal Medicine https://amzn.to/2LmUODZ



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