Objective: to evaluate the impact of preoperative use of angiotensin-converting enzyme inhibitors on hemodynamics in elderly patients. The use of enalapril on the day of surgery in patients lowly tolerant to transient hypoxia and hypercapnia was accompanied by hemodynamic instability during anesthesia and by the higher frequency of vasopressor usage. The hemodynamics of patients moderately tolerant to transient hypoxia and hypercapnia did not depend on the intake of enalapril
