title: New electrocardiographic criteria for predicting successful ablation of premature ventricular contractions from the right coronary cusp.
abstract: BACKGROUND
  ECG features for predicting successful ablation sites of outflow tract (OT) premature ventricular complex (PVCs) have been previously presented, but effective predictors of right coronary cusp (RCC) remain elusive.
  
  
  METHODS
  106 patients (59 males, 56±14years) who underwent successful PVC ablation were studied. Various ECG patterns and measurements were analyzed to identify the unique features of RCC PVC origins. The R-wave duration index (RWDI) was calculated as a percentage by dividing the QRS complex duration by the longest R-wave duration in lead V1or V2.
  
  
  RESULTS
  Successful ablation sites were the RCC in 18 patients, the left coronary cusp (LCC) in 20, the RCC/LCC junction (RLJ) in 22, the AIV/GCV in 11 and the right ventricular outflow tract in 35. Forty-seven patients had dominantly positive forces in lead I. Among these 47 patients, 19 were ablated from the RCC (18/18, 100%), eighteen from the RVOT (18/35, 51%), five from the LCC (5/20, 25%), and five from the RLJ (6/22, 27%). The S-wave amplitude in lead aVLwas significantly smaller in RCC than LCC or RLJ PVCs (0.1±0.3mV vs. 1.1±0.5mV, p<0.001). The V1-2RWDI was significantly greater in RCC than RVOT PVCs (51.8±20.5% vs. 30.8±13.9%, p<0.001). The optimal cut-off values of <0.95mV for S-wave (area under the curve, AUC: 0.76, p<0.01) and >43.6% for R-wave duration index in V1or V2(AUC: 0.83, p<0.001) were determined by ROC analysis.
  
  
  CONCLUSIONS
  The presence of a dominant positive lead I, RWDI >43.6% and S-wave amplitude in aVL<0.95mV predicted RCC PVCs with a sensitivity of 83% and specificity of 94%.
authors.affiliation: Division of Cardiology, Department of Internal Medicine, Kosin University Gospel Hospital, Kosin University College of Medicine, Busan 602-702, Republic of Korea.
authors.forename: Sung Il
authors.initials: SI
authors.lastname: Im
authors.affiliation: Division of Cardiology, Department of Medicine, Heart Vascular Stroke Institute, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea. Electronic address: kyoungmin.park@samsung.com.
authors.forename: Kyoung-Min
authors.initials: KM
authors.lastname: Park
authors.affiliation: Division of Cardiology, Department of Medicine, Heart Vascular Stroke Institute, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea.
authors.forename: Seung-Jung
authors.initials: SJ
authors.lastname: Park
authors.affiliation: Division of Cardiology, Department of Medicine, Heart Vascular Stroke Institute, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea.
authors.forename: June Soo
authors.initials: JS
authors.lastname: Kim
authors.affiliation: Division of Cardiology, Department of Medicine, Heart Vascular Stroke Institute, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea.
authors.forename: Young Keun
authors.initials: YK
authors.lastname: On
mesh_terms: D000328:Adult; D000368:Aged; D017115:Catheter Ablation / Q000009:adverse effects / Q000379:methods; D004562:Electrocardiography / Q000379:methods*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011183:Postoperative Complications / Q000517:prevention & control*; D011237:Predictive Value of Tests; D056910:Republic of Korea; D018879:Ventricular Premature Complexes / Q000175:diagnosis / Q000503:physiopathology / Q000601:surgery
keywords: Electrocardiogram; Premature ventricular contraction; Right coronary cusp