Which rhythm features complete AV dissociation with independent atrial and ventricular activity?

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Multiple Choice

Which rhythm features complete AV dissociation with independent atrial and ventricular activity?

Complete AV dissociation occurs when the atria and ventricles beat independently because conduction from the atria to the ventricles is completely blocked. The atria generate regular P waves at their own rate, while the ventricles rely on an escape pacemaker below the block, producing a slower, independent ventricular rhythm. This separation of atrial and ventricular activity with no fixed relationship between P waves and QRS complexes is the hallmark of complete heart block, also called third-degree heart block. The QRS morphology varies with the escape site: junctional escape gives a narrow QRS, while infranodal escape gives a wide QRS. Other rhythms either maintain some AV connection or lack organized electrical activity, so they don’t show true AV dissociation.

Complete AV dissociation occurs when the atria and ventricles beat independently because conduction from the atria to the ventricles is completely blocked. The atria generate regular P waves at their own rate, while the ventricles rely on an escape pacemaker below the block, producing a slower, independent ventricular rhythm. This separation of atrial and ventricular activity with no fixed relationship between P waves and QRS complexes is the hallmark of complete heart block, also called third-degree heart block. The QRS morphology varies with the escape site: junctional escape gives a narrow QRS, while infranodal escape gives a wide QRS. Other rhythms either maintain some AV connection or lack organized electrical activity, so they don’t show true AV dissociation.

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