Harvey A M, Faena M, Darke P G G, Ferasin L
University of Bristol, Department of Clinical Veterinary Science, Langford House, Langford, BS40 5DU, UK.
J Vet Intern Med. 2005 Jul-Aug;19(4):533-6. doi: 10.1892/0891-6640(2005)19[533:eobpof]2.0.co;2.
The aim of this study was to determine whether changes in body position alter feline electrocardiographic parameters. Forty-seven cats referred to the Feline Unit of the University of Bristol had electrocardiograms (ECGs) recorded. Only cats presenting in sinus rhythm were included in the study (n = 41). ECGs were recorded either as part of the investigation for potential cardiac disease (n = 38) or as a preanesthetic screen (n = 3). Standard 6-lead ECGs (leads I, II, III, aVR, aVL, and aVF) were recorded in 3 different recumbent positions in the 41 cats. Recordings were 1st made in right lateral (RL) recumbency, followed by sternal (ST) and then left lateral (LL) recumbency. Measurements were taken of the amplitude and duration of P waves and QRS complexes and duration of PQ and QT intervals from lead II was taken in the 3 different positions. Mean electrical axis (MEA) also was calculated. Repeated measures analysis of variance was performed and identified a significant difference in R wave amplitudes (P = .009) and MEA (P = .037) among the 3 different body positions. Two-tailed paired t-tests demonstrated that the R wave amplitude differed significantly both in ST (P = .025) and LL recumbency (P = .009). The mean R wave amplitude was reduced in both ST and LL recumbency when compared with RL recumbency. The MEA only was significantly different in LL recumbency (P = .037). ST and LL recumbencies should not be used for recording ECGs in cats if amplitudes and MEA are to be compared with standard references.
本研究的目的是确定体位变化是否会改变猫的心电图参数。47只转诊至布里斯托大学猫科动物诊疗中心的猫接受了心电图（ECG）记录。本研究仅纳入呈现窦性心律的猫（n = 41）。ECG记录要么作为潜在心脏疾病检查的一部分（n = 38），要么作为麻醉前筛查（n = 3）。在41只猫的3种不同卧位记录了标准6导联ECG（I、II、III、aVR、aVL和aVF导联）。记录首先在右侧卧位（RL）进行，接着是胸骨卧位（ST），然后是左侧卧位（LL）。在3种不同体位下测量了II导联P波和QRS波群的振幅和持续时间以及PQ和QT间期的持续时间。还计算了平均电轴（MEA）。进行了重复测量方差分析，结果表明3种不同体位之间的R波振幅（P = .009）和MEA（P = .037）存在显著差异。双侧配对t检验表明，ST卧位（P = .025）和LL卧位（P = .009）时R波振幅均有显著差异。与RL卧位相比，ST卧位和LL卧位时平均R波振幅均降低。仅LL卧位时MEA有显著差异（P = .037）。如果要将振幅和MEA与标准参考值进行比较，ST卧位和LL卧位不应用于猫的ECG记录。
