Tuyển tập các báo cáo nghiên cứu về bệnh thú y được đăng trên tạp chí y học General Psychiatry cung cấp cho các bạn kiến thức về ngành thú y đề tài: Change of Diurnal Heart Rate Patterns During Pregnancy and Lactation in Dogs (Canis familiaris). | Acta vet. scand. 2003 44 105-110. Change of Diurnal Heart Rate Patterns During Pregnancy and Lactation in Dogs Canis familiaris By K. Olsson1 . Lagerstedt2 A. Bergstrom2 and J. Haggstrom1 2 department of Anatomy and Physiology and department of Small Animal Clinical Sciences Faculty of Veterinary Medicine Swedish University of Agricultural Sciences Uppsala Sweden. Olsson K Lagerstedt A-S Bergstrom A Hăggstrôm J Change of diurnal heart rate patterns during pregnancy and lactation in dogs canis familiaris . Acta vet. scand. 2003 44 105-110. - Pregnancy and lactation involve great demands on the cardiovascular system. The purpose of this study was to investigate how the heart rate and diurnal heart rate pattern change when dogs become pregnant or lactate. Five clinically healthy female beagle dogs were mated and delivered three to seven healthy puppies. The heart rate was investigated with 24-h ECG Holter once during anoestrus at 3 5 7 and 9 weeks of pregnancy and at week 4 postpartum lactation . However at 9 weeks the ECG could not be recorded for the fully 24 h in 4 of 5 dogs because labour started and the dogs then appeared disturbed by the recordings. The results at this date are not included in the statistical comparison. The heart rate increased progressively during pregnancy and was still elevated at 4 weeks of lactation. During late pregnancy the difference in heart rates between daytime and nighttime became smaller but the heart rate was significantly higher in daytime in all periods. In conclusion the increased heart rates during pregnancy and lactation reflect increased demands on the cardiovascular system and may be important to consider in clinical practice. đog pregnancy Introduction Heart rate changes in response to both external and internal stimuli but diurnal variations during the reproductive cycle appear not to have been studied in dogs. During pregnancy extra blood is needed to meet the demands of the feto-placental unit leading to an .
