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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/2984

Title: Effects of two newly synthesized analogues of lidocaine on rat arterial blood pressure and heart rate
Authors: Al Rasheed, N.M.
Al-Sayed, M.I.
Al Zuhair, H.H.
Al Obaid, A.R.M.
Fatani, A.J.
Keywords: Lidocaine
Ca2C channels
Na+ channels
Blood pressure
Heart rate
Issue Date: 2001
Publisher: Academic Press
Citation: Pharmacological Research: 43 (4); 313-319
Abstract: Two new analogues of lidocaine were synthesized at the College of Pharmacy, King Saud University: compound I (Methyl-2-[2-(N,N-diethylamino) acetamido]-3-cyano-4,5-dimethylbenzoate) and compound II (Methyl-2-[2-(piperidino) acetamido]-3-cyano-4,5-dimethylbenzoate). Their influence on the arterial blood pressure and the heart rate of urethane-anaesthetized rats was studied and compared with the actions of lidocaine. Compounds I, II and lidocaine induced significant dose-dependent decreases in the arterial blood pressure and heart rate, which usually returned to basal values within 3–5 min. There were significant differences in the potency of the three compounds in producing their effects on blood pressure and heart rate (P < 0:0001, ANOVA). Compound II was 14 and 6 times more potent in reducing blood pressure and 8 and 2 times more capable of reducing the heart rate than lidocaine and compound I, respectively. The results of this study also indicated the ineffectiveness of antagonists of autonomic, histaminergic and 5-HT receptor, and various vasodilators in blocking the actions of the three compounds on blood pressure and heart rate. Pretreatment with CaCl2 significantly reduced the hypotension and bradycardia induced by the three compounds, suggesting the involvement of calcium channels, probably of the L type. Several possible mechanisms are postulated. In conclusion, the results direct attention to the capability of the two new compounds to decrease blood pressure and heart rate; affects that may have clinical potential.
URI: http://hdl.handle.net/123456789/2984
ISSN: 1043–6618
Appears in Collections:College of Pharmacy

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