Objectives: To define electrocardiographic features of complete left bundle branch block (LBBB) and right bundle branch block (RBBB), and the use of R-peak time (RPT) to identify interventricular dyssynchrony in dogs with BBB. Animals, materials and methods: Twelve-lead ECG tracings of 20 dogs with RBBB, 20 with LBBB, and 60 healthy dogs were retrospectively analyzed and RPT was measured in precordial leads. Interventricular dyssynchrony index (IDI) was than calculated. Results: In RBBB, mean electrical axis (MEA) was 111 [120/100], V1RPTwas significantly longer (61 ms [55e72 ms]) than left precordial leads RPT (V2:25 ms [22e30 ms]; V3:25 ms [22e29 ms]; V4:24 ms [21e29 ms]; V5:25 ms [22e29 ms]; V6:25 ms [22e29 ms]) and when compared to normal dogs (P < 0.001). In LBBB, MEA was 76 [70/81], RPT in left precordial leads was significantly longer (V2:49 ms [34e58 ms]; V3:49 ms [43e57 ms]; V4:52 ms [45e62 ms]; V5:53 ms [45e63 ms]; V6:55 ms [45e63 ms]) than V1RPT (17 ms [15e20 ms]) and when compared to normaldogs (P<0.001). V1RPT>28 ms and V5RPT>36 ms were found to predict the presence of RBBB and LBBB with a sensitivity of 100% and 96.7%, and a specificity of 96.7% and 99.5%, respectively. The IDI was 23% [16e29%] in normal dogs and significantly greater in dogs with RBBB (33% [30e38%]; P < 0.001) and LBBB (32% [23e41%]; P ¼ 0.006). Conclusions: This study defines ECG features and RPT in dogs with BBB. Electrical interventricular dyssynchrony can be defined using IDI in dogs with BBB.
Noninvasive electrocardiographic parameters to assess interventricular dyssynchrony in dogs with bundle branch blocks
D. Cavallini;
2022
Abstract
Objectives: To define electrocardiographic features of complete left bundle branch block (LBBB) and right bundle branch block (RBBB), and the use of R-peak time (RPT) to identify interventricular dyssynchrony in dogs with BBB. Animals, materials and methods: Twelve-lead ECG tracings of 20 dogs with RBBB, 20 with LBBB, and 60 healthy dogs were retrospectively analyzed and RPT was measured in precordial leads. Interventricular dyssynchrony index (IDI) was than calculated. Results: In RBBB, mean electrical axis (MEA) was 111 [120/100], V1RPTwas significantly longer (61 ms [55e72 ms]) than left precordial leads RPT (V2:25 ms [22e30 ms]; V3:25 ms [22e29 ms]; V4:24 ms [21e29 ms]; V5:25 ms [22e29 ms]; V6:25 ms [22e29 ms]) and when compared to normal dogs (P < 0.001). In LBBB, MEA was 76 [70/81], RPT in left precordial leads was significantly longer (V2:49 ms [34e58 ms]; V3:49 ms [43e57 ms]; V4:52 ms [45e62 ms]; V5:53 ms [45e63 ms]; V6:55 ms [45e63 ms]) than V1RPT (17 ms [15e20 ms]) and when compared to normaldogs (P<0.001). V1RPT>28 ms and V5RPT>36 ms were found to predict the presence of RBBB and LBBB with a sensitivity of 100% and 96.7%, and a specificity of 96.7% and 99.5%, respectively. The IDI was 23% [16e29%] in normal dogs and significantly greater in dogs with RBBB (33% [30e38%]; P < 0.001) and LBBB (32% [23e41%]; P ¼ 0.006). Conclusions: This study defines ECG features and RPT in dogs with BBB. Electrical interventricular dyssynchrony can be defined using IDI in dogs with BBB.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
