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Effects of Antihistamines on the Cardiovascular System in Telemetered Conscious Dogs

  • 이윤희 (식품의약품안전청 국립독성연구원 일반약리팀) ;
  • 나한광 (식품의약품안전청 국립독성연구원 일반약리팀) ;
  • 윤재석 (식품의약품안전청 국립독성연구원 일반약리팀) ;
  • 정수연 (식품의약품안전청 국립독성연구원 일반약리팀) ;
  • 김주일 (식품의약품안전청 국립독성연구원 일반약리팀) ;
  • 최기환 (식품의약품안전청 국립독성연구원 일반약리팀)
  • Lee Yun-Hee (General Pharmacology Team, National Institute of Toxicological Research, Korea Food and Drug Administration) ;
  • Na Han-Kwang (General Pharmacology Team, National Institute of Toxicological Research, Korea Food and Drug Administration) ;
  • Yun Jae-Suk (General Pharmacology Team, National Institute of Toxicological Research, Korea Food and Drug Administration) ;
  • Chung Soo-Youn (General Pharmacology Team, National Institute of Toxicological Research, Korea Food and Drug Administration) ;
  • Kim Joo-Il (General Pharmacology Team, National Institute of Toxicological Research, Korea Food and Drug Administration) ;
  • Choi Ki-Hwan (General Pharmacology Team, National Institute of Toxicological Research, Korea Food and Drug Administration)
  • 발행 : 2006.04.01

초록

Two Antihistamines, terfenadine and astemizole have been withdrawn from major markets for the reason that these durgs have been reported to induce QT interval prolongation associated with the onset of Torsades do Pointes (TdP), resulting in a life-threatening ventricular arrhythmia. In this study, we investigated effects of diphenhydramine on electrocardiograms and hemodynamic parameters in conscious telemetered dogs. We validated and defined the sensitivity of the test system by monitoring basal parameters and using positive control substance, terfenadine. Single administration effects were tested during 24 hours for each test drug at dose 1 mg/kg, 10 mg/kg, 30 mg/kg, 100 mg/kg. We monitored QT, QTc, heart rate, blood pressure and body temperature after administering test drugs. In conscious telemetered dogs, diphenhydramine significantly prolonged $QT\;(6.8\%\;of\;basal)\;and\;QTc\;(7.8\%\;of\;basal)$ at 100 mg/kg. Other parameters were not affected significantly. These findings suggest that antihistamines could induce important clinical relevance for patients taking excessive dosages of conventional antihistamines and those at risk of developing cardiac arrhythmias. Future studies that include other antihistamines and other classes will be necessary to predict the torsadogenic risk of drugs in humans.

키워드

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