Identify the rhythm: no P waves, irregularly irregular R-R intervals, narrow QRS.
QUESTION
Identify the block: progressive PR lengthening until a QRS drops (grouped beating).
QUESTION
Identify the rhythm: regular narrow-complex tachycardia at 150-250 bpm with no visible P waves.
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ANSWER
Supraventricular tachycardia (SVT). High rate and absent P waves indicate reentrant supraventricular mechanism, with narrow QRS confirming origin above the ventricles.