Objective:To investigate the effect of Simvastatin on the development of high-altitude environment induced pulmonary hypertension and the endothelial nitric oxide synthase system in rat.Method:The 40 healthy male Sprague-Dawley rats(weight 180 to 250g)were randomly divided into 4 groups:Control group(Group N,n=10),in which the rats stayed in orthobaric environment and fed with vehicle;Experimental altitude pulmonary hypertension group(Group H+P,n=10),the animals were kept in hypobaric chamber which simulate...