犬心率变异的实验研究

为了解正常犬心率变异（ＨＲＶ）的特征，以便在此基础上作各种病理模型的前瞻性ＨＲＶ研究。取健康成年杂种犬２０只，自由活动下记录２４ｈ心电图。ＨＲＶ分析采用时域、频域分析方法及构制２４ｈ三维频谱图及Ｐｏｉｎｃａｒｅ散点图。结果：２０只犬２４ｈ总心搏数为１３４６５２．６１±１６１９．３１次，平均心率为１０８．００±１６．６１ｂｐｍ。正常ＲＲ间期标准差（ＳＤＮＮ）、连续５ｍｉｎ正常ＲＲ间期标准差均值（ＳＤＡＮＮ）、连续５ｍｉｎ正常ＲＲ间期均值的标准差（ＳＤＮＮｉ）、相邻正常ＲＲ间期差值的均方根（ｒＭＳＳＤ）、相邻正常ＲＲ间期超过５０ｍｓ的百分比（ＰＮＮ５０）分别为１０８．００±４５．１１ｍｓ、９５．００±４３．８１ｍｓ、４１．４５±１８．０５ｍｓ、１９９．００±５４．４１ｍｓ、５６．００±１３．９４％。超低频成分（ＵＬＦ）、极低频成分（ＶＬＦ）、低频成分（ＬＦ）、高频成分（ＨＦ）、ＬＦ／ＨＦ分别为３８．００±３３．７６ｂｐｍ２／Ｈｚ、６１．００±４０．５８ｂｐｍ２／Ｈｚ、２７８．００±１６４．１７ｂｐｍ２／Ｈｚ、２７８．００±１９６．６０ｂｐｍ２／Ｈｚ、１．７３±２．５９。ｒＭＳＳＤ、ＨＦ等反映ＲＲ间期快速变化的成?

Experimental Study of Dog's Heart Rate Variability

To know the heart rate variability(HRV) features of healthy dogs so as to make foresighted study of various pathological models on the basis of them.HRVs were analysed in time domain,frequency domain and working up 24 hour 3 dimensional frequency spectrum graph and Poincare poltting by having 24 hour ECG of 20 adult healthy mongrel dogs during their free activities.Total heart beat number of the 20 dogs in 24 hours:134 65261±1 61931 beat,average heart rate 108.00±1661 bpm,SDNN 108.00±45.11 ms,SDANN 95.00±43.81 ms,SDNNi 41.45±18.05 ms,rMSSD 199.00±54.41 ms,PNN50 56.00±13.94%,ULF 38.00±3376 bpm2/Hz,VLF 61.00±4058 bpm2/Hz,LF 278.00±16417 bpm2/Hz,HF 278.00±19660 bpm2/Hz,LF/HF 173±259.The components prevail,such as rMSSD and HF,reflecting the changes at high rates during RR period.The circadian rhythm of dogs HRV was characterized by HF elevating at night and reaching its peak at 2 oclock.The 3 dimensional frequency spectrum graph showed that both the sympathetic and vagus nerves of a dog gave regulations of wide frequency band.The Poincare plotting took on a distinctive lobulated shape.Conclusions:Dogs have their innate rule of HRV.The characteristics of dogs HRV is related to their physiological features in their unique type of respiration and high alertness.