RESEARCH COMMUNICATIONS OF THE 28th ECVIM-CA CONGRESS

Records of thirty privately‐owned healthy dogs were retrospectively reviewed. All dogs underwent physical examination, thoracic radiography, 12‐lead electrocardiogram using the lead system described by Santilli in 2016, and echocardiogram. The dogs were allocated in three groups according to the thoracic index (dorso‐ventral thorax diameter x 100/latero‐lateral thorax diameter): 90‐100 brachymorphic, 50‐60 dolichomorphic, and 60‐90 mesomorphic. For each ECG, three measurements were performed. Normality was tested using the Shapiro‐Wilcoxon W‐test. To evaluate differences between morphotypes and leads, nonparametric analysis of variance was performed by Kruskas Wallys test, as data were not normally distributed. In the brachymorphic morphotype, RPT median duration and range were: V1: 10 ms (7‐16), V2: 17 ms (10‐19), V3: 18 ms (11‐24), V4: 19.5 ms (11‐24), V5: 21 ms (14‐24), V6: 21 ms (12‐25). In the mesomorphic morphotype, RPT median duration and range were: V1: 13 ms (9‐19), V2: 21 ms (12‐26), V3: 21.5 ms (18‐25), V4: 22 ms (17‐28), V5: 24 ms (18‐30), V6: 24.5 ms (17‐31). In the dolichomorphic morphotype, RPT median duration and range were: V1: 15.5 ms (7‐21), V2: 27 ms (19‐35), V3: 28 ms (20‐34), V4: 28 ms (20‐36), V5: 29 ms (24‐37), V6: 29.5 ms (25‐37). In all precordial leads, RPT was statistically different between morphotypes (P<0.00001). In lead V1, RPT was statistically shorter (P<0.00001) compared to V2 through V6 in all morphotypes.