2:1 atrioventricular block is a form of second-degree AV nodal block and occurs ... when an ECG reveals 2:1 AV nodal block: Carotid sinus massage or adenosine: This slows the sinus rate, allowing ...
On occasion, the sinus rate can be different rom the ventricular rate ― known as AV dissociation ― such as in ventricular tachycardia or third-degree AV block. Treatment is aimed at the ...
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