Idioventricular rhythm represents a distinct cardiac activation pattern originating within the ventricular myocardium, bypassing the normal conduction system. The resulting impulse spreads slowly through the ventricular muscle, leading to a wide QRS complex on the electrocardiogram, often exceeding 120 milliseconds.
Idioventricular Rhythm Underlying Myocardial Damage Causes
When sinus node dysfunction occurs or conduction through the atrioventricular node is blocked, these ventricular cells depolarize spontaneously at a rate typically between 20 and 40 beats per minute. The rhythm is typically regular, though minor variations can occur.
Diagnosis relies heavily on the electrocardiogram, where the rhythm is identified by its wide, bizarre QRS complexes, absent preceding P waves, and a rate generally below 50 beats per minute. This rhythm typically emerges when the sinoatatrial node fails or the atrioventricular node cannot conduct impulses effectively, serving as a final protective mechanism for maintaining cardiac output.
Idioventricular Rhythm Underlying Myocardial Damage Causes
Acute myocardial infarction, particularly involving the inferior wall, is a common precipitant due to ischemia affecting the conduction system. Long-term implantation of a permanent pacemaker is rarely necessary unless the rhythm persists due to irreversible conduction system disease.
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