Which rhythm is an escape rhythm originating from the AV node, with rate around 40-60 bpm and P waves may be hidden?

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An escape rhythm from the AV node occurs when the faster pacemaker (SA node) isn’t driving the heart, so a slower pacemaker in the AV junction takes over. Its rate is typically about 40–60 beats per minute, and the P waves may be hidden in or immediately after the QRS because atrial activation can be retrograde or not clearly before ventricles. The QRS complex remains narrow since ventricular depolarization still uses the normal His-Purkinje pathway. This pattern—the AV junction taking over with a slower rate and often absent or hidden P waves—is the hallmark of a junctional escape rhythm. By contrast, a pulseless electrical activity pattern is a nonperfusing state, ventricular fibrillation is chaotic and lacking a coherent rhythm, and normal sinus rhythm is driven by the SA node with visible P waves preceding a normal, faster, regular QRS.