Carnabuci Cristina, Tognetti Rosalba, Vezzosi Tommaso, Marchesotti Federica, Patata Valentina, Domenech Oriol
Istituto Veterinario di Novara, Strada Provinciale 9, 28060 Granozzo con Monticello, Novara, Italy.
Polivet, Via Salaria 1317, 00138, Rome, Italy.
J Vet Med Sci. 2019 Apr 27;81(4):620-625. doi: 10.1292/jvms.18-0699. Epub 2019 Mar 11.
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.
在犬类心电图检查中，心室平均电轴（MEA）的参考区间为+40°至+100°。犬类的MEA值会受到病犬体位以及胸廓形状的影响。本研究的目的是评估健康杜宾犬的MEA，推测部分犬的MEA会出现左偏。在这项回顾性研究中，纳入了41只健康的、由客户拥有的杜宾犬。对所有犬只进行了超声心动图检查和标准六导联心电图检查。使用等电位线法计算MEA。还评估了II导联QRS波群的形态和Q/R比值。MEA的中位数为+45°，范围为-45°至+90°。41只犬中有16只（39%）的MEA出现偏移，均表现为电轴左偏（范围为-45°至+30°）。年龄与MEA显著相关（P = 0.008），呈负线性相关。41只犬中有26只（63%）在II导联出现深Q波。与MEA在参考范围内的犬只相比，MEA左偏的犬只Q/R比值更高（0.66；范围为0.28 - 1.35），而MEA在参考范围内的犬只Q/R比值为0.44（范围为0.04 - 0.73；P < 0.001）。总之，与参考范围相比，相当数量的健康杜宾犬存在MEA左偏，MEA偏移的犬只在II导联显示出更高的Q/R比值。在对杜宾犬进行心电图评估时应考虑这些数据。
