Cannon A waves
Cannon A waves
Cannon A waves (/ˈkænən/ /eɪ/ /weɪvz/), are a type of jugular venous pressure wave. The term is derived from the Latin canna meaning "tube" and the English wave, referring to the wave-like motion observed in the jugular vein.
Definition
Cannon A waves are abnormal, large amplitude pulsations seen in the jugular vein that occur when the atria and ventricles contract simultaneously. This phenomenon is typically associated with conditions that disrupt the normal synchrony between the atria and ventricles, such as atrioventricular dissociation and ventricular tachycardia.
Clinical Significance
Cannon A waves can be a sign of several heart conditions, including atrioventricular block, junctional rhythm, and ventricular tachycardia. They are also seen in conditions like tricuspid stenosis and pulmonary hypertension. The presence of Cannon A waves can be used as a diagnostic tool to identify these conditions.
Related Terms
- Jugular venous pressure: The indirectly observed pressure over the venous system via visualization of the internal jugular vein.
- Atria: The two upper chambers of the heart.
- Ventricles: The two lower chambers of the heart.
- Atrioventricular dissociation: A condition where the atria and ventricles beat independently of each other.
- Ventricular tachycardia: A fast, abnormal heart rate that begins in the ventricles.
- Atrioventricular block: A type of heart block in which the conduction between the atria and ventricles of the heart is impaired.
- Junctional rhythm: A heart rhythm originating from the area of the atrioventricular node.
- Tricuspid stenosis: A valvular heart disease that narrows the opening of the tricuspid valve.
- Pulmonary hypertension: A type of high blood pressure that affects the arteries in the lungs and the right side of the heart.
External links
- Medical encyclopedia article on Cannon A waves
- Wikipedia's article - Cannon A waves
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