Key result
Electrophysiological maneuvers showed that a postpacing interval minus tachycardia cycle length (PPI-TCL) <125 ms differentiated ORT from AVNRT with 83% sensitivity and 100% specificity.
Why the study?
Do specific electrophysiological maneuvers and measurements differentiate atypical atrioventricular node-dependent long RP supraventricular tachycardias in patients with SVT?
Population
19 patients with 20 atypical atrioventricular node-dependent long RP supraventricular tachycardias…
Comparison
Electrophysiological study with measurement of… vs Comparison between orthodromic reciprocating…
Design
Cohort
Authors
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Supports PPI-TCL <125 ms for ORT differentiation in long-RP SVT; leaves open validation in larger prospective cohorts.
Observational (n=19)
Do specific electrophysiological maneuvers and measurements differentiate atypical atrioventricular node-dependent long RP supraventricular tachycardias in patients with SVT?
Mean Difference: 58 (95% CI 26.3–89.7)
Absolute Event Rate: 118% vs 176%
Standard entrainment criteria are modestly sensitive but highly specific for ORT, with a PPI-TCL cutoff of 125 ms performing better than 115 ms, and specific AH criteria differentiating NFRT/AVNRT from PJRT.
Ho et al. (2013) conducted an observational in Atypical atrioventricular node-dependent long RP supraventricular tachycardias (n=19). Electrophysiological study maneuvers (PPI-TCL, corrected PPI, VA, HA, AH) vs. Different SVT mechanisms (ORT vs AVNRT) was evaluated on Postpacing interval minus tachycardia cycle length (PPI-TCL) (MD 58, 95% CI 26.3-89.7). Electrophysiological maneuvers showed that a postpacing interval minus tachycardia cycle length (PPI-TCL) <125 ms differentiated ORT from AVNRT with 83% sensitivity and 100% specificity.
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