Algorithm of Zhong et al for Distinguishing Atrioventricular Node Re-Entrant Tachycardia (AVNRT) from Atrioventricular Reciprocating Tachycardia (AVRT)
Zhong et al used changes in the electrocardiogram to distinguish atrioventricular node re-entrant tachycardia (AVNRT) from atrioventricular reciprocating tachycardia (AVRT) with a concealed accessory pathway. The authors are from Peking University People’s Hospital in Beijing.
Features of atrioventricular node re-entrant tachycardia (AVNRT):
(1) pseudo r wave in V1
(2) S/Q wave in inferior leads
(3) absence of ST elevation in aVR (see below)
Features of atrioventicular reciprocating tachycardia (AVRT)
(1) RP interval >= 100 ms
(2) ST elevation at 80 ms after J point in aVR (>= 1.0 mm if horizontal or upsloping OR >= 1.5 mm if downsloping)
Performance:
• The algorithm correctly diagnosed the mechanism of the tachycardia in about 85%.
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