[Myocardial infarction pain duration in relation to alterations in homeostasis characteristics of cardiac injury].

Relationship between duration of myocardial infarction pain (MIP) and homeostatic disturbances as well as degree of myocardial injury was investigated. Thirty patients admitted to the Coronary Care Unit during the pain due to progressive myocardial infarction were studied. Patients were divided into two groups according to the duration of pain. First one consisted of subject with pain lasting up to four hours, second group included those whose pain exceeded 4 hours. Following parameters were measured: 24 hours urine catecholamines excretion, serum triiodothyronine and creatinine phosphokinase activity estimated every 6 hours during consecutive two days. We concluded that patients with longer MIP displayed lager thyro-adrenergic and myocardial injury.