Left shift of the ventricular mean electrical axis in healthy Doberman Pinschers

The Journal of Veterinary Medical Science

Tommaso VEZZOSI¹  Cristina CARNABUCI²  Rosalba TOGNETTI³ 

[1] Department of Veterinary Sciences, University of Pisa, Via Livornese, 56122 San Piero a Grado, Pisa, Italy;Istituto Veterinario di Novara, Strada Provinciale 9, 28060 Granozzo con Monticello, Novara, Italy;Polivet, Via Salaria 1317, 00138, Rome, Italy

关键词: canine;    deep Q wave;    dilated cardiomyopathy;    electrocardiography;    left axis deviation;   

DOI  :  10.1292/jvms.18-0699

学科分类：兽医学

来源: Japanese Society of Veterinary Science

【 摘 要 】

In canine electrocardiography, the reference interval of the ventricular mean electrical axis (MEA) is between +40° and +100°. MEA values in dogs can be influenced by the patient position as well as by the shape of the thorax. The aim of this study was to evaluate the MEA in healthy Doberman Pinschers, hypothesizing that some present a left shift of the MEA. In this retrospective study, 41 healthy, client-owned Doberman Pinschers were included. Echocardiography and standard six-lead ECG examination were performed in all dogs. The MEA was calculated using the isoelectric method. The morphology of the QRS complex and the Q/R ratio in lead II were also evaluated. The median MEA was +45° and ranged from −45° to +90°. MEA was deviated in 16/41 dogs (39%), all presenting a left axis deviation (range, −45° to + 30°). Age was significantly associated with the MEA (P=0.008), showing a negative linear correlation. A deep Q wave in lead II was present in 26/41 (63%) dogs. The Q/R ratio was higher in dogs presenting left shift of the MEA (0.66; range, 0.28–1.35) in comparison to dogs with a MEA within reference range (0.44; range, 0.04–0.73; P<0.001). In conclusion, a significant number of healthy Doberman Pinschers present a left shift of the MEA compare to the reference range, and dogs with MEA deviation show a higher Q/R ratio in lead II. This data should be considered when electrocardiographic evaluation is performed in Doberman Pinschers.

【 授权许可】

Unknown