title: Global and local dispersion of ventricular repolarization: endocardial monophasic action potential mapping in swine and humans by using an electro-anatomical mapping system.
abstract: This article evaluates whether the global dispersion of ventricular repolarization (DVR) can be estimated from measurements between a few adjacent or remote sites. Monophasic action potentials (MAP) were recorded from 61 +/- 18 left (LV) or right ventricular (RV) sites in 10 pigs and 44 +/- 16 LV, or RV sites in 8 patients by using the CARTO mapping system. MAP duration (MAPd) and end-of-repolarization time were calculated at each site and 13 repolarization maps from pigs and 10 from patients were reconstructed. Global dispersions in MAPd and EOR over the LV or RV were compared with the adjacent DVR among 3 - 7 MAPs in areas > or = 0.7 and < or = 1 cm(2) and with the remote DVRs between 2 MAPs with the greatest activation time difference (remote DVR1) and between the apical and laterobasal LV or RV (remote DVR2). The adjacent dispersions in end-of-repolarization and MAPd were significantly smaller than the global ones, 13 +/- 3 and 12 +/- 3 ms vs. 44 +/- 9 and 42 +/- 12 ms in pigs and 13 +/- 7 and 14 +/- 8 ms vs. 72 +/- 24 and 66 +/- 22 ms in patients. The remote DVR1 (30 +/- 8 and 17 +/- 10 ms in pigs and 40 +/- 28 and 28 +/- 17 ms in patients) and remote DVR2 (16 +/- 7 and 11 +/- 10 ms in pigs and 35 +/- 24 and 21 +/- 21 ms in patients) were also significantly smaller than the global DVRs. In conclusion, global DVR is poorly estimated from MAP recordings from a few adjacent or remote sites, suggesting the importance of obtaining global information in evaluating DVR.
authors.affiliation: Department of Cardiology, University Hospital, Lund, Sweden.
authors.forename: Ole
authors.initials: O
authors.lastname: Kongstad
authors.forename: Shiwen
authors.initials: S
authors.lastname: Yuan
authors.forename: Eva
authors.initials: E
authors.lastname: Hertervig
authors.forename: Magnus
authors.initials: M
authors.lastname: Holm
authors.forename: Edgars
authors.initials: E
authors.lastname: Grins
authors.forename: Bertil
authors.initials: B
authors.lastname: Olsson
mesh_terms: D000200:Action Potentials / Q000502:physiology; D000328:Adult; D000368:Aged; D000818:Animals; D018780:Body Surface Potential Mapping / Q000379:methods*; D017115:Catheter Ablation; D022062:Electrophysiologic Techniques, Cardiac; D004699:Endocardium / Q000033:anatomy & histology / Q000503:physiopathology; D006352:Heart Ventricles / Q000033:anatomy & histology / Q000503:physiopathology*; D006801:Humans; D008875:Middle Aged; D023421:Models, Animal; D008955:Models, Cardiovascular; D009905:Optical Rotatory Dispersion; D013552:Swine; D017180:Tachycardia, Ventricular / Q000503:physiopathology / Q000601:surgery