{"id":1681,"date":"2020-05-18T10:06:57","date_gmt":"2020-05-18T17:06:57","guid":{"rendered":"https:\/\/up.physicaldiagnosispdx.com\/up\/?page_id=1681"},"modified":"2021-04-28T09:39:33","modified_gmt":"2021-04-28T16:39:33","slug":"cannon-a-wave-2","status":"publish","type":"page","link":"https:\/\/up.physicaldiagnosispdx.com\/up\/cardiology-multimedia-new\/cannon-a-wave-2\/","title":{"rendered":"Cannon a Wave"},"content":{"rendered":"
[vc_row css=”.vc_custom_1592016780081{background-color: #fff9f9 !important;}”][vc_column][vc_column_text]The a wave of the jugular venous waveform occurs as a result of right atrial contraction. When there is resistance to right ventricular filling, right atrial contraction generates increased pressure, resulting in large a waves. 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. When cannon a waves occur with every beat, it indicates atrioventricular dissociation with retrograde atrial activation from supraventricular tachycardia (e.g., junctional rhythm).<\/span>
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Patient 1:<\/h1>\n

This patient was admitted to the hospital with complete heart block. These videos demonstrate a jugular venous waveform with cannon a waves. Note that the large outward wave occurs intermittently, distinguishing it from giant a waves, which occur with every beat. Notice that there is a normal jugular venous waveform between the cannon a waves. <\/span>[\/vc_column_text][\/vc_column][\/vc_row][vc_row css=”.vc_custom_1592016751332{background-color: #dcd9dd !important;}”][vc_column width=”1\/2″][vc_column_text]\n

Cannon a Wave<\/span><\/strong>
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