Cannon A waves, or cannon atrial waves, are waves seen occasionally in the jugular vein of humans with certain cardiac arrhythmias.

Jul 4, 2023 · Cannon A waves are large-amplitude waves seen in the jugular veins during a physical exam. They are caused by simultaneous contraction of atria and ventricle leading to exaggerated right atrial pressure.

Apr 7, 2009 · Cannon A wave occurs with atrioventricular dissociation and right atrial contraction against a closed tricuspid valve. Large A waves are associated with reduced right ventricular compliance or elevated right ventricular end-diastolic pressure.

May 23, 2023 · Cannon A waves are large-amplitude waves seen in the jugular veins during a physical exam and are typically associated with certain heart conditions. This article discusses the causes, symptoms, and treatment of Cannon A waves, including medications, pacemaker, cardioversion, and catheter ablation.

Jan 28, 2016 · Authors: Matthew K.Y. Tung, M.B., B.S., and Stewart Healy, M.B., B.S. Author Info & Affiliations. A 65-year-old man presented with an abrupt onset of heart palpitations and...

Cannon "a" waves are abnormalities in the a wave that occur when right atrial contraction takes place against a closed tricuspid valve (Figure 19.6). The classic condition in which this disordered cardiac contraction occurs is complete heart block.

Cannon a waves usually occur intermittently, unlike giant a waves, which occur with every beat. The cannon a wave occurs as a result of atrial contraction against a closed tricuspid valve, which occurs sporadically as a result of atrioventricular dissociation.

Cannon A waves are encountered during AV block, VT, and in AV nodal reentry (Tung & Healy, 2016). AV nodal reentrant tachycardia may show regular A waves due to simultaneous atrial and ventricular activation. In the presented case, there were irregular cannon A …

Jul 4, 2023 · Cannon A waves are large-amplitude waves seen in the jugular veins during a physical exam. They are caused by simultaneous contraction of atria and ventricle leading to exaggerated right atrial pressure.

Pacemaker syndrome, resulting from AV dyssynchrony in a pacemaker-dependent patient, can present with alarming clinical features such as pre-syncope, hypotension, and other signs of congestive heart failure. One characteristic feature is the …