[Acute myocardial infarction: vegetative balance in individuals subjected to occupational hazards]

The article covers results of studies concerning heart rhythm variability in 194 patients having myocardial infarction with elevated ST segment, of which 93 were subjected to prolonged occupational hazards. Vegetative dysbalance with prevailing sympathetic influences on heart rhythm were more marked in individuals subjected to occupational hazards. The same patients demonstrated significantly weaker compensation mechanisms underlying normalization of vegetative tone and recovery of biologic rhythms of sinus node activity. The patients with prolonged occupational exposure to hazards showed lower (at hospital stage) level of heart rate amplitude intensity in lower and high frequency range--that can be assessed as a result of toxic influence by xenobiotics on sympathetic and parasympathetic vegetative nervous system.