Document Detail

Effects of combination therapy with atenolol and amlodipine on blood pressure control and stroke prevention in stroke-prone spontaneously hypertensive rats.
MedLine Citation:
PMID:  17959026     Owner:  NLM     Status:  MEDLINE    
AIM: To test the effects of atenolol and amlodipine, either alone or in combination, on blood pressure, blood pressure variability (BPV), baroreflex sensitivity (BRS), and the prevalence of stroke in stroke-prone spontaneously hypertensive rats (SHR-SP). METHODS: In the first set of the study, 24 8-month-old, female SHR-SP rats were randomly divided into 3 groups. Blood pressure, heart period, and BRS were determined before and after the intragastric administration of atenolol (10 mg/kg) and amlodipine (1.0 mg/kg), either alone or in combination. In the second set of the study, 40 male and 40 female rats were randomly assigned to 1 of the following 4 groups: control, atenolol (10, amlodipine (1.0, and both (10 male and 10 female in each group). The stroke incident and survival time were recorded. RESULTS: Atenolol and amlodipine, either alone or in combination, significantly decreased blood pressure, with the exception of the amlodipine-induced effect on diastolic blood pressure. Meanwhile, only the combination treatment significantly decreased the BPV levels for the same period. The q-values calculated by the probability sum analysis were 1.17 and 2.67 for systolic and diastolic blood pressure, respectively, and were 2.48 and 2.10 for systolic and diastolic BPV, respectively, following administration. Neither drug exhibited any significant effect on BRS. Atenolol and amlodipine, either alone or in combination, significantly increased the lifespan of SHR-SP, with the best effect elicited by the combination therapy. CONCLUSION: A significant synergism exists between atenolol and amlodipine in lowering and stabilizing blood pressure in SHR-SP. Combination therapy may be an optimal strategy for the prevention of stroke in hypertension.
Gang Ling; Ai-jun Liu; Fu-ming Shen; Guo-jun Cai; Jian-guo Liu; Ding-feng Su
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Acta pharmacologica Sinica     Volume:  28     ISSN:  1671-4083     ISO Abbreviation:  Acta Pharmacol. Sin.     Publication Date:  2007 Nov 
Date Detail:
Created Date:  2007-10-25     Completed Date:  2009-05-12     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100956087     Medline TA:  Acta Pharmacol Sin     Country:  China    
Other Details:
Languages:  eng     Pagination:  1755-60     Citation Subset:  IM    
Department of Pharmacology, School of Pharmacy, Second Military Medical University, Shanghai 200433, China.
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MeSH Terms
Amlodipine / administration & dosage*
Antihypertensive Agents / administration & dosage*
Atenolol / administration & dosage*
Blood Pressure / drug effects*
Drug Synergism
Drug Therapy, Combination
Rats, Inbred SHR
Stroke / drug therapy,  prevention & control*
Survival Rate
Reg. No./Substance:
0/Antihypertensive Agents; 29122-68-7/Atenolol; 88150-42-9/Amlodipine

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