Diurnal variations of blood pressure in dogs

• Published in: Journal of Veterinary Medical Science Vol. 61; no. 6; pp. 643 - 647
• Main Authors: Mishina, M. (Azabu Univ., Sagamihara, Kanagawa (Japan). Faculty of Veterinary Medicine), Watanabe, T, Matsuoka, S, Shibata, K, Fujii, K, Maeda, H, Wakao, Y
• Format: Journal Article
• Language: English
• Published: Japan JAPANESE SOCIETY OF VETERINARY SCIENCE 01-06-1999; Japan Science and Technology Agency
• Subjects: Animals; BIOLOGICAL RHYTHMS; BLOOD PRESSURE; Blood Pressure - physiology; Blood Pressure Monitors; canine; CHIEN; Circadian Rhythm; diurnal variation; DOGS; Female; Male; PERRO; PRESION SANGUINEA; PRESSION SANGUINE; RITMOS BIOLOGICOS; RYTHME BIOLOGIQUE; Sleep; TELEMETRIA; TELEMETRIE; TELEMETRY
• ISSN: 0916-7250; 1347-7439
• DOI: 10.1292/jvms.61.643

Using the telemetry system, we measured the blood pressure (BP) invasively in seven adult mongrels while unanesthetized and unbound. Post-operative BP after implanting the telemetry BP transmitter showed temporarily high values due to the invasive nature of the surgery. It was, however, observed that BP gradually decreased thereafter, and showed settled trends from the eighth day post-operatively. When we took the average of the systolic, mean and diastolic BP at hourly intervals for each of the dogs once their BP had settled, a twin peak diurnal variation (at 8:00 and 19:00) was observed. Moreover, significantly high values (p<0.05) were identified in active state compared with when sleeping or at rest. The 24 hr BP measured by the telemetry system in seven normal dogs resulted in the following values: systolic 123.4 ± 7.9 mmHg, mean 91.1 ± 5.6 mmHg, and diastolic 74.5 ± 4.9 mmHg.