| Summary: | Yunlu Liu,1,2 Lin Wang,1 Feng Wan,3 Na Yang1 1Institute of Laboratory Animal Sciences, Sichuan Academy of Medical Sciences & Sichuan Provincial People’s Hospital, Chengdu, People’s Republic of China; 2Department of Pharmacy, Sichuan Academy of Medical Sciences & Sichuan Provincial People’s Hospital, Chengdu, People’s Republic of China; 3College of Pharmacy, Chengdu University of Traditional Chinese Medicine, Chengdu, People’s Republic of ChinaCorrespondence: Na YangInstitute of Laboratory Animal Sciences, Sichuan Academy of Medical Sciences & Sichuan Provincial People’s Hospital, Ying Long Community, Zhong he Street Office, High Tech Zone, Chengdu 610212, People’s Republic of ChinaTel +86 13880145342Fax +86 2867087558Email nayang@glpcd.comPurpose: Anisodine hydrobromide (Ani) is isolated from the medicinal plant Anisodus tanguticus (Maxim.) Pascher for clinical use. Although considerable research regarding Ani has been reported, the safety profiles of Ani are currently unknown. This study investigated the cardiorespiratory effects of Ani in conscious dogs to provide clinicians a detailed safety profile of Ani on the cardiorespiratory system.Materials and Methods: Using the Latin square design, the study was divided into six phases, where in each phase, six telemetered beagle dogs received one dose of normal saline or sotalol hydrochloride or Ani (0.1, 0.4, 1.6, or 6.4 mg/kg). Electrocardiogram, blood pressure (BP) and respiratory parameters were collected before and after administration for 24 hours. Statistical comparisons were performed at scheduled time-points.Results: The heart rate was significantly increased, PR and QTCV intervals were significantly shortened in Ani 0.4, 1.6, 6.4 mg/kg treatment group after drug administration. Compared with the saline group, a significant increase in heart rate and shortening of PR, QTCV intervals were observed in the Ani 1.6, 6.4 mg/kg treatment groups from 5 min to 4 h time-points. Diastolic and mean BP were significantly increased in Ani 1.6, 6.4 mg/kg from 1 h to 2 h time-points compared to those of the saline control. Accelerated breathing was observed in the first 20 min after Ani 0.4, 1.6, and 6.4 mg/kg treatment, although not statistically significant. Furthermore, no significant differences were observed in any of the corresponding indexes of Ani 0.1 mg/kg treatment group at different time-points compared to those of the saline group.Conclusion: Ani may have adverse effects on the cardio-respiratory systems of dogs at doses above 0.4 mg/kg, whereas Ani 0.1 mg/kg was devoid of potentially deleterious effects on cardiorespiratory function.Keywords: anisodine hydrobromide, electrocardiogram, blood pressure, cardio-respiratory function, telemetered dogs, safety
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