title: [Acute myocardial infarction in patients under 40 years of age].
abstract: OBJECTIVE
  To evaluate the short and long-term prognosis of a group of patients aged 40 and under, who developed an acute myocardial infarction.
  
  
  METHODS
  In the last 15 years we studied a group of 73 patients aged 40 and under with a confirmed diagnosis of first acute myocardial infarction. Patients with infarctions caused by coronary embolisms or to revascularization procedures were excluded.
  
  
  RESULTS
  Ninety percent were male and mean the age was 35. The most frequent risk factors observed were cigarette smoking in 64 (88%), hypertension in 16 (22%), hypercholesterolemia in 12 (16%) and diabetes in 3 (4%). Seven (9%) patients had no risk factors. The myocardial infarction was anterior em 50 (68%) cases and inferior in the remaining 23 (32%). Severe heart failure (Killip III and IV) was present in 3 (4%). Angiographic studies were performed in 63 (86%). Cineangiography showed critical coronary lesions (obstruction greater than 70%) in one vessel in 38 (60%) patients, multivessel disease in 18 (28%) and 7 (12%) had normal coronary vessels. In-hospital mortality was 5% (3 patients died due to severe heart failure and 1 due to cerebro-vascular accident). The 56 survivors were followed-up to 15 years, with overall survival of 74%. Fourty-nine (71%) were asymptomatic and 7 (10%) had recurrent chest pain. There were 7 (10%) late deaths and follow-up was lost in 6 (9%). Reinfarctions were observed in 5 cases (7%). Revascularization procedures were performed in 12 (17%) patients (bypass-graft surgery in 9 and coronary angioplasty in 3).
  
  
  CONCLUSIONS
  Young patients with acute myocardial infarction have a low mortality rate in the early phase and a favorable outcome after the discharge of the hospital.
authors.affiliation: Instituto Dante Pazzanese de Cardiologia, São Paulo.
authors.forename: L F
authors.initials: LF
authors.lastname: Tanajura
authors.forename: L S
authors.initials: LS
authors.lastname: Piegas
authors.forename: A
authors.initials: A
authors.lastname: Timerman
authors.forename: R F
authors.initials: RF
authors.lastname: Ramos
authors.forename: C
authors.initials: C
authors.lastname: Gun
authors.forename: S
authors.initials: S
authors.lastname: Timerman
authors.forename: L A
authors.initials: LA
authors.lastname: Abdalla
authors.forename: R B
authors.initials: RB
authors.lastname: Freire
authors.forename: E R
authors.initials: ER
authors.lastname: Romano
authors.forename: J E
authors.initials: JE
authors.lastname: Sousa
mesh_terms: D000293:Adolescent; D000328:Adult; D001938:Brazil / Q000453:epidemiology; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D006973:Hypertension / Q000150:complications; D008297:Male; D009203:Myocardial Infarction / Q000453:epidemiology* / Q000209:etiology; D015995:Prevalence; D012189:Retrospective Studies; D012307:Risk Factors; D012907:Smoking / Q000009:adverse effects
vernacular_title: Infarto agudo do miocárdio em pacientes com idade inferior a 40 anos.