title: Hemodynamics in the guinea pig after anesthetization with ketamine/xylazine.
abstract: The resting hemodynamics were determined in 8 guinea pigs after they were anesthetized with ketamine/xylazine. Measurements were made of blood pressure, heart rate, cardiac output, arterial blood gases, and pH. These measurements were obtained initially at 4 to 5 hours after an injection (IM) of ketamine HCl (25 mg) and xylazine (0.15 mg) was given to anesthetize the animals for catheterization (period 1), again 5 days after the operation (period 2), and finally 4 to 5 hours after a 2nd injection of ketamine/xylazine (period 3). There were no differences in heart rates, respiratory rates, or cardiac outputs among the 3 study periods. However, arterial blood pressure was slightly, but significantly, lowered after, and presumably due to, instrumentation (62 +/- 4 mm of Hg, P less than 0.05) when compared with the 5-day postoperative period (67 +/- 7 mm of Hg) or after the readministration of anesthetics (66 +/- 7 mm of Hg). The partial pressure of carbon dioxide in the arterial blood was slightly lower (4 mm of Hg, P less than 0.05) in both acutely postanesthetic periods (period 1 and period 3) than in the same animals at postoperative day 5 (period 2). This study has demonstrated that resting hemodynamics measured shortly after this anesthesia with ketamine/xylazine are not largely different from those in chronically instrumented animals.
mesh_terms: D000768:Anesthesia, General / Q000662:veterinary*; D000818:Animals; D001794:Blood Pressure; D002302:Cardiac Output; D006168:Guinea Pigs / Q000502:physiology / Q000601:surgery*; D006339:Heart Rate; D006439:Hemodynamics; D007649:Ketamine; D013843:Thiazines; D014991:Xylazine
chemical_list: D013843:Thiazines; D014991:Xylazine; D007649:Ketamine