title: [Connection between the season of year, season of birth, and trimester of the individual year in patients with ischemic heart disease at risk for myocardial infarction and its complications].
abstract: OBJECTIVE
  To clarify whether the periods of the individual year (from one birthday to another), season of the year, season of birth of patients with ischemic heart disease (IHD) are involved in development of myocardial infarction and its complications.
  
  
  METHODS
  Case histories of 349 men hospitalized for acute myocardial infarction (MI) have been analysed. The analysis concerned the rate of MI onset in various seasons of the year, trimesters of the individual year (IY) and seasons of the patient's birth.
  
  
  RESULTS
  Incidence of MI was higher in winter and summer. MI complications develop more frequently in spring. Trimester I and IV (months i-III and IX-XII since birthday) appeared more favourable for development of MI and its complications. Most favourable for IM was trimester III of IY, for MI complications--trimester II of IY. IM occurred more frequently in IHD patients born in autumn, complications in those born in summer.
  
  
  CONCLUSIONS
  Development of MI and its complications is determined by a number of chronobiological factors: season of the year, season of the patient's birth and period of the individual year. This information is valuable in planning preventive measures.
authors.forename: O L
authors.initials: OL
authors.lastname: Barbarash
authors.forename: N V
authors.initials: NV
authors.lastname: Fomina
authors.forename: N A
authors.initials: NA
authors.lastname: Barbarash
authors.forename: N I
authors.initials: NI
authors.lastname: Lazik
authors.forename: A A
authors.initials: AA
authors.lastname: Martsiiash
mesh_terms: D006801:Humans; D008297:Male; D008875:Middle Aged; D009203:Myocardial Infarction / Q000150:complications / Q000503:physiopathology*; D017202:Myocardial Ischemia / Q000150:complications / Q000503:physiopathology*; D012307:Risk Factors; D012621:Seasons