16th international congress of update in cardiology and cardiovascular surgery , Ankara, Türkiye, 30 Ekim - 01 Kasım 2020, ss.409-410
Background: Premature ventricular complexes (PVC) in structurally normal hearts commonly arise from right ventricular outflow tract (RVOT) and left ventricular outflow tract (LVOT) including aortic valve cusps, aortomitral continuity and epicardial summit area. Outflow tract ectopy can manifest itself as nonsustained and sustained monomorphic ventricular tachycardia (VT). The aim of present study is to evaluate the predictive value of QTc dispersion, Tp-Te interval and Tp-Te/QT ratio for idiopathic monomorphic outflow tract VT occurrence in patients with frequent idiopathic outflow tract PVCs. Methods: A total of 180 patients (49.2 ± 13.6 years, 74 male) who had undergone outflow tract PVC ablation between 01.01.2015 and 01.11.2018 constituted our study population. Patients with isolated outflow tract PVC without any VT recording on Holter recordings and without any inducible VT at EPS were classified as isolated PVC group. Patients with any episode of VT that has the same morphology with outflow tract PVC were classified as nonsustained or sustained VT groups based on the duration of VT episode. QTc dispersion, Tp-Te and Tp-Te/QT ratio values were calculated and compared between groups. Results: There were 116 patients with isolated PVC, 35 patients with nonsustained VT and 29 patients with sustained VT. QTc dispersion, Tp-Te and Tp-Te/QT ratio values were significantly lower in patients with isolated PVC compared to patients with nonsustained or sustained VT episodes (Table-1). Tpeak to Tend interval greater than 110.5 msec on derivation V6 predicted VT occurrence with 93.8% sensitivity and 82.8% specificity. Tpeak to Tend/QT interval greater than 0.27 on derivation V6 predicted VT occurrence with 93.8% sensitivity and 0.81% specificity (Figure 1)
Conclusion: Tp-Te interval and Tp-Te/Qt ratio on derivation V6 may aid in prediction of presence of outflow tract VT in clinical practice.