無心臟病臨床症狀之老年犬心電圖評估研究

Study of Assessing Electrocardiography in Geriatric Dogs without Clinical Signs of Cardiac Diseases

顏君如(Chun-Ju Yan) ； 林中惠(Chung-Hui Lin) ； 黃慧璧(Hui-Pi Huang)

《臺灣獸醫學雜誌》 32卷4期 (2006/12) Pp. 319-325

https://doi.org/10.7009/TVJ.200612.0319

摘要

The purposes of this study were to investigate electrocardiography (ECG) in geriatric dogs without clinical signs of heart failure, and to observe electrocardiographic changes associated with ageing. Fifty geriatric dogs included in the present study were held in right lateral recumbency on a nonconductive surface, and ECG strips were obtained from these dogs without chemical restraint. Seventy eight percent of geriatric dogs were detected to have electrocardiographic abnormalities in this study. The most common abnormalities in ECG of those 50 dogs included P mitrale (44%), left-deviation of mean electrical axis (28%), tall R amplitude (26%), prolonged ORS duration (22%), and T wave amplitude greater than one fourth of R wave (20%). ANOVA analysis showed no significant differences of P-wave width, R-wave amplitude, ORS duration, and mean electrical axis existed among different genders (P ＞ 0.05). There were also no significant differences of P-wave width, ORS duration, and mean electrical axis among various breeds (P ＞ 0.05); but R-wave amplitudes were significantly different (P ＜ 0.001) among breeds. Cocker Spaniels had significantly taller R-wave amplitudes than mongrels (P＜ 0.001), Pomeranians (P = 0.041), and Shiba Inus (P = 0.005). Miniature Poodles also had significantly taller R-wave amplitudes compared with mongrels (P = 0.001) or Shiba Inus (P = 0.013). In conclusion, most geriatric dogs who have not shown clinical signs associated with heart diseases may have electrocardiographic abnormalities. Therefore, electrocardiography should be included in routine health examinations in geriatric dogs for detecting cardiopulmonary changes and class I heart failure in the early stage.

關鍵字

心電圖 ； 老年犬

並列摘要

The purposes of this study were to investigate electrocardiography (ECG) in geriatric dogs without clinical signs of heart failure, and to observe electrocardiographic changes associated with ageing. Fifty geriatric dogs included in the present study were held in right lateral recumbency on a nonconductive surface, and ECG strips were obtained from these dogs without chemical restraint. Seventy eight percent of geriatric dogs were detected to have electrocardiographic abnormalities in this study. The most common abnormalities in ECG of those 50 dogs included P mitrale (44%), left-deviation of mean electrical axis (28%), tall R amplitude (26%), prolonged ORS duration (22%), and T wave amplitude greater than one fourth of R wave (20%). ANOVA analysis showed no significant differences of P-wave width, R-wave amplitude, ORS duration, and mean electrical axis existed among different genders (P ＞ 0.05). There were also no significant differences of P-wave width, ORS duration, and mean electrical axis among various breeds (P ＞ 0.05); but R-wave amplitudes were significantly different (P ＜ 0.001) among breeds. Cocker Spaniels had significantly taller R-wave amplitudes than mongrels (P＜ 0.001), Pomeranians (P = 0.041), and Shiba Inus (P = 0.005). Miniature Poodles also had significantly taller R-wave amplitudes compared with mongrels (P = 0.001) or Shiba Inus (P = 0.013). In conclusion, most geriatric dogs who have not shown clinical signs associated with heart diseases may have electrocardiographic abnormalities. Therefore, electrocardiography should be included in routine health examinations in geriatric dogs for detecting cardiopulmonary changes and class I heart failure in the early stage.

並列關鍵字

Electrocardiography ； geriatric dog