title: Abnormal P-wave terminal force in lead V1 is associated with cardiac death or hospitalization for heart failure in prior myocardial infarction.
abstract: The aim of this study was to clarify the prognostic significance of P-wave terminal force in lead V1 (PTFV1) in patients with prior myocardial infarction (MI). We retrospectively examined 185 patients with prior MI. The primary end point was cardiac death or hospitalization for heart failure. Abnormal PTFV1 was defined as PTFV1 ≥ 40 mm × ms. During a follow-up period of 6.4 ± 2.9 years, 39 patients developed the primary end point. A Kaplan-Meier analysis showed a lower primary event-free rate in 79 patients with abnormal PTFV1 than in 106 patients with normal PTFV1 (P < 0.001). When we classified 79 patients with abnormal PTFV1 into 31 with a purely negative P wave in lead V1 and 48 with a biphasic negative P wave in lead V1, the primary event-free rate did not differ between the two groups of patients. A multivariate Cox regression analysis selected age (hazard ratio (HR) 1.09, 95 % confidence interval (CI) 1.04-1.14, P < 0.001), multivessel coronary disease (HR 2.33, 95 % CI 1.02-5.28, P = 0.04), and abnormal PTFV1 (HR 2.72, 95 % CI 1.24-5.99, P = 0.01) as independent predictors of the primary end point. In conclusion, abnormal PTFV1 is an independent predictor of cardiac death or hospitalization for heart failure in patients with prior MI. The analysis of P waves in lead V1 should provide useful prognostic information in patients with prior MI.
authors.affiliation: Internal Medicine 2, Faculty of Medicine, Oita University, Idaigaoka 1-1, Hasama-machi, Yufu, 879-5593, Japan.
authors.forename: Gang
authors.initials: G
authors.lastname: Liu
authors.forename: Akira
authors.initials: A
authors.lastname: Tamura
authors.forename: Kumie
authors.initials: K
authors.lastname: Torigoe
authors.forename: Yoshiyuki
authors.initials: Y
authors.lastname: Kawano
authors.forename: Kazuhiro
authors.initials: K
authors.lastname: Shinozaki
authors.forename: Munenori
authors.initials: M
authors.lastname: Kotoku
authors.forename: Junichi
authors.initials: J
authors.lastname: Kadota
mesh_terms: D000368:Aged; D016279:Atrial Function, Left; D016009:Chi-Square Distribution; D018572:Disease-Free Survival; D005260:Female; D006333:Heart Failure / Q000175:diagnosis / Q000209:etiology* / Q000401:mortality* / Q000503:physiopathology; D006760:Hospitalization; D006801:Humans; D053208:Kaplan-Meier Estimate; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D009203:Myocardial Infarction / Q000150:complications* / Q000175:diagnosis / Q000401:mortality* / Q000503:physiopathology; D016016:Proportional Hazards Models; D012189:Retrospective Studies; D012307:Risk Factors; D013997:Time Factors