Introduction
Clinical presentation
Initial evaluation
FIGURE 241-1 Diagnostic possibilities based on the appearance of the 12-lead ECG recorded during an episode of SVT. AVNRT, AV nodal reentry tachycardia; ORT, orthodromic AV reentry tachycardia; AT, focal atrial tachycardia. 
FIGURE 241-2 Diagnostic ewect of increasing AV node blockade with vagal maneuvers, adenosine, verapamil or beta blockers.
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