Department of Small Animal Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, 4474 TAMU, College Station, TX 77843-4474, USA.
Department of Small Animal Clinical Sciences, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University, 4474 TAMU, College Station, TX 77843-4474, USA.
Vet J. 2022 Oct;288:105885. doi: 10.1016/j.tvjl.2022.105885. Epub 2022 Aug 23.
Selected electrocardiograph (ECG) intervals may be useful when incorporated into prediction models for cardiac risk assessment in dogs. Standard recommendations for ECG acquisition may not be adhered to in practice. Study objectives were to compare duration of P, PR, QRS, QT, and R wave peak time intervals in: (1) lead II ECGs vs. single lead precordial ECGs in conscious dogs; (2) lead II ECGs with electrodes placed in proximal limb (PL) vs. distal limb (DL) positions with dogs in right lateral (RL) recumbency, left lateral (LL) recumbency and standing positions; (3) single lead precordial ECGs from dogs in RL, LL and standing positions; and (4) before and after sedation with butorphanol in lead II ECGs obtained in RL recumbency. All intervals could be measured in all dogs (conscious and sedated) from a RL lead II ECG with both PL and DL electrode positioning. This was reduced to 98% for lead II ECGs with dogs in LL and standing positions. Intervals that were not different regardless of recording device, dog position, electrode limb position or sedation included P, QRS and P + QRS, suggesting that these intervals have the greatest clinical utility across a variety of recording conditions. The main impact of positioning in healthy dogs was the lack of ability to consistently measure all intervals in standing dogs, particularly P wave duration. Further investigation is needed to determine if this is applicable to dogs with cardiac disease.
在将心电图（ECG）间隔时间纳入犬心脏风险评估预测模型中时，某些特定的 ECG 间隔可能会很有用。但在实际操作中，可能无法遵循 ECG 采集的标准建议。本研究的目的是比较：（1）清醒犬的 II 导联 ECG 与单导联心前区 ECG ；（2）右侧卧（RL）、左侧卧（LL）和站立位的犬，II 导联中近端肢（PL）和远端肢（DL）电极位置；（3）RL、LL 和站立位的犬的单导联心前区 ECG ；（4）RL 位镇静前后的 II 导联 ECG 中各间隔时间的差异。所有间隔时间都可以通过 RL 位 II 导联 ECG 进行测量，无论 PL 和 DL 电极位置如何，所有犬（清醒和镇静）都可以测量。当犬处于 LL 和站立位时，该方法的应用比例降低至 98%。无论记录设备、犬的位置、电极肢位置或镇静状态如何，P、QRS 和 P+QRS 等间隔时间都没有差异，这表明这些间隔时间在各种记录条件下具有最大的临床应用价值。健康犬定位的主要影响是无法在站立犬中始终测量所有间隔时间，尤其是 P 波持续时间。需要进一步研究以确定其是否适用于患有心脏病的犬。
