Doxey S, Boswood A
Royal Veterinary College, Hawkshead Lane, North Mymms, Hatfield, Hertfordshire AL9 7TA.
Vet Rec. 2004 Jun 5;154(23):713-7. doi: 10.1136/vr.154.23.713.
The vasovagal tonus index (VVTI), a time-domain indicator of heart rate variability, was measured in 92 dogs of six breeds (German shepherd dogs, labrador retrievers, cocker spaniels, boxers, bulldogs and cavalier King Charles spaniels). There was a significant difference in VVTI between the six breeds (P = 0.003). Brachycephalic dogs had a higher VVTI than other types of dog (P < 0.005), and when comparing individual breeds brachycephalic breeds tended to have a higher VVTI than non-brachycephalic breeds, although the difference was not always significant. The VVTI was negatively correlated with heart rate (P < 0.01) and dogs suffering from congestive heart failure had a lower VVTI than other dogs, whether compared within or between breeds (P < 0.01).
在6个品种的92只犬（德国牧羊犬、拉布拉多寻回犬、可卡犬、拳师犬、斗牛犬和查理士王小猎犬）中测量了血管迷走张力指数（VVTI），它是心率变异性的时域指标。6个品种之间的VVTI存在显著差异（P = 0.003）。短头犬的VVTI高于其他类型的犬（P < 0.005），并且在比较各个品种时，短头品种的VVTI往往高于非短头品种，尽管差异并不总是显著。VVTI与心率呈负相关（P < 0.01），并且无论在品种内还是品种间比较，患有充血性心力衰竭的犬的VVTI均低于其他犬（P < 0.01）。
