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Objectives To examine the preventive effect of atorvastatin on acetylcholine (Ach)-induced endothelium-dependentrelaxation (EDdR) in small pulmonary artery (SPA) rings in monocrotaline (MCT)-inducedpulmonary hypertension rats.Methods 72 MaleSD rats were randomly assigned into four groups: normal control (Ctr), pulmonaryarterial hypertension (PAH), PAH preventively treated with 5 mg/kg/d (Lator)and 10 mg/kg/d (Hator) atorvastatin respectively.Rats were sacrifiedat the end of 1st, 2nd and 4th wks after administration.