When the AV junction fails, the ventricles activate at their inherent slow rate, creating a wide-complex rhythm on the electrocardiogram. Primary Intrinsic Cardiac Conditions The most frequent etiological category involves direct damage to the sinus node or atrioventricular (AV) conduction system.
Idioventricular Rhythm Causes Drug Induced
In these degenerative processes, the transition to an idioventricular rhythm is often insidious, sometimes discovered incidentally during routine monitoring before symptoms of profound bradycardia manifest. Similarly, myocardial infarction involving the interventricular septum may impair the bundle branches and surrounding tissue, creating a complete heart block that necessitates ventricular escape activity.
Concurrently, inflammatory states such as myocarditis or pericarditis irritate the myocardial tissue, leading to enhanced automaticity or triggered activity in the ventricles. Age-related fibrosis of the sinus node, known as sick sinus syndrome, or calcification of the AV node represents a gradual failure of the conduction system.
Idioventricular Rhythm Causes Drug Induced
Reperfusion following thrombolysis or percutaneous intervention often restores sinus rhythm, indicating the idioventricular rhythm was a transient protective mechanism. Severe electrolyte imbalances, specifically hyperkalemia, slow conduction and depress SA node function.
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