title: Characteristics of patients less than 45 years of age compared with older patients undergoing coronary artery bypass grafting.
abstract: BACKGROUND
  Coronary artery disease (CAD) was not recognized as common among young patients until the study by Yater in 1948. Subsequent studies further elucidated the nature of the disease, which had become more apparent in the younger groups.
  
  
  OBJECTIVE
  The study was undertaken to determine the prevalence of risk factors and severity of coronary disease among young patients aged < or = 45 years undergoing coronary artery bypass grafting (CABG) compared with older patients.
  
  
  METHODS
  In all, 112 young patients aged < or = 45 years (Group 1) and 798 older patients aged > 45 years (Group 2) were analyzed for trends to hypertension, smoking, diabetes, family history of heart disease, hypercholesterolemia, obesity, and history of previous myocardial infarction (MI). The severity of disease was examined in terms of number of diseased vessels, vessel size, number of grafts performed, performance of endarterectomies, and left ventricular function.
  
  
  RESULTS
  Group 1 had a higher incidence of positive family history (68.5 vs. 51.2%, p < 0.05), and lower incidences of hypertension (62.7 vs. 81.5%, p < 0.05), obesity (42.9 vs. 83.9%, p < 0.05), and history of previous MI (54.5 vs. 94.6%, p < 0.05). Group 2 had a higher incidence of left main disease (22.6 vs. 11.4%, p < 0.05). The distribution of the affected vessels of the young patients was most commonly the left anterior descending (90.4%) followed by the right coronary (79.8%) and circumflex arteries (69.2%). Group 2 had more grafts per patient (3.82 vs. 3.37, p < 0.05). The size of the diseased vessels measured intraoperatively was similar (1.56 vs. 1.58 mm, p = NS) in both groups. Endarterectomy was performed almost three times more often in Group 1 patients (8.2 vs. 3.0%, p < 0.05). Operative mortality was less in Group 1 mean (1.8 vs. 6.3%, p < 0.05). Group 2 had a greater mean left ventricular ejection fraction (53.8 vs. 49.7%, p < 0.05).
  
  
  CONCLUSIONS
  Compared with the older population, patients < or = 45 years of age who underwent CABG had (1) a higher incidence of positive family history of CAD, (2) a higher likelihood of requiring an endarterectomy, and (3) lower operative mortality rate despite a slightly poorer ventricular function.
authors.affiliation: Division of Cardiothoracic Surgery, Harbor-UCLA Medical Center, Torrance, USA.
authors.forename: T D
authors.initials: TD
authors.lastname: Nguyen
authors.forename: C
authors.initials: C
authors.lastname: de Virgilio
authors.forename: J
authors.initials: J
authors.lastname: Kakuda
authors.forename: B O
authors.initials: BO
authors.lastname: Omari
authors.forename: J C
authors.initials: JC
authors.lastname: Milliken
authors.forename: J R
authors.initials: JR
authors.lastname: Robertson
authors.forename: F J
authors.initials: FJ
authors.lastname: Baumgartner
mesh_terms: D000328:Adult; D000367:Age Factors; D000368:Aged; D001026:Coronary Artery Bypass / Q000401:mortality; D003327:Coronary Disease / Q000150:complications / Q000235:genetics / Q000601:surgery*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012307:Risk Factors; D012720:Severity of Illness Index