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Objective To detect the A/C1166 polymorphism of angiotensin Ⅱ type-1 receptor (AT1 R) gene in essential hypertensive elderly.MethodsThe A/C1166 polymorphism of AT1 R gene was assessed by polymerase chain reaction restriction fragment length polymorphism (PCR RFLP) in a case control study of 87 essential hypertensive elders (EH) and 55 normotensive elders (NT).ResultsThe genotype frequencies of AA, AC, CC were 0.805, 0.161, 0.034 in EH group and 0.927, 0.073, 0.000 in NT group respectively. The frequency of C1166 allele was higher in EH group (0.115) than in NT group (0.036)(P＜0.05).ConclusionThe results indicate that A/C1166 polymorphism of AT1 R gene may be associated with essential hypertension in elderly.