RT Journal Article SR Electronic T1 STUDIES ON CYCLOPROPANE IX JF Journal of Pharmacology and Experimental Therapeutics JO J Pharmacol Exp Ther FD American Society for Pharmacology and Experimental Therapeutics SP 198 OP 201 VO 85 IS 2 A1 BENJAMIN H. ROBBINS YR 1945 UL http://jpet.aspetjournals.org/content/85/2/198.abstract AB 1. An investigation of the blood pressure and electrocardiographic changes has been made in dogs anesthetized with cyclopropane after medication with Demerol. 2. In most dogs there is a reduction in heart rate and temporary fall in blood pressure after the intramuscular injection of 10 mg./kg. of Demerol. 3. The cardiac irregularities routinely observed during cyclopropane anesthesia after morphine premedication in dogs are not observed after Demerol premedication. 4. Demerol reduces the amount of cyclopropane necessary for the lighter planes of anesthesia.