title: Determinants of disability in older coronary patients.
abstract: BACKGROUND
  Patient-reported physical function is a major component of disability determinations and an important contributor to health-related quality of life. Prior studies of coronary disability have shown a surprisingly poor correlation between real-life activity profile and exercise capacity measured on the treadmill. The goal of the current investigation was to evaluate the relative importance of medical factors, sex, fitness-related measures, and psychologic factors as determinants of patient-reported physical function score in older persons with established coronary heart disease (CHD).
  
  
  METHODS
  Determinants of disability were studied in 51 community-dwelling patients >65 years old (71 +/- 5 years, range 65-83 years) with established chronic CHD. Patient-reported physical function score (scaled 0-100) was measured by the Medical Outcomes Study Short Form physical function section. Independent variables included clinical and demographic data, treadmill testing, rest and exercise echocardiography, measures of body composition, strength, aerobic fitness, and a depression score.
  
  
  RESULTS
  Patients with a diagnosis of myocardial infarction had a lower physical function score than did patients with other CHD diagnoses (68 +/- 19 vs 82 +/- 22, P <.05). Univariate predictors of patient-reported physical function score included peak aerobic capacity (R = 0.62), treadmill test duration (R = 0.61), depression score (R = -0.60), handgrip strength (R = 0.42), and comorbidity score (R = -0.39). Peak aerobic capacity (R2 = 0.38) and depression score (cumulative R2 = 0.60) were the best independent predictors of physical function. Women had lower physical function scores than men (64 +/- 22 vs 78 +/- 20, P <.05) despite a similar age, diagnostic distribution, depression score, and comorbidity score. Resting left ventricular ejection fraction was not a predictor of physical function score.
  
  
  CONCLUSIONS
  Peak aerobic capacity and depression score were the best independent predictors of patient-reported physical function score in older coronary patients. These data focus on the potential for exercise training and treatment of mental depression to prevent and treat coronary disability in older coronary patients.
authors.affiliation: Division of Cardiology, Department of Medicine, University of Vermont College of Medicine, Burlington, Vt, USA. Philip.Ades@vtmednet.org
authors.forename: Philip A
authors.initials: PA
authors.lastname: Ades
authors.forename: Patrick D
authors.initials: PD
authors.lastname: Savage
authors.forename: Marc D
authors.initials: MD
authors.lastname: Tischler
authors.forename: Eric T
authors.initials: ET
authors.lastname: Poehlman
authors.forename: Justine
authors.initials: J
authors.lastname: Dee
authors.forename: Joelyn
authors.initials: J
authors.lastname: Niggel
mesh_terms: D015502:Absorptiometry, Photon; D000368:Aged; D000369:Aged, 80 and over; D000704:Analysis of Variance; D001823:Body Composition; D003327:Coronary Disease / Q000503:physiopathology* / Q000523:psychology; D003863:Depression / Q000503:physiopathology; D004185:Disability Evaluation; D004452:Echocardiography / Q000379:methods; D005080:Exercise Test; D018737:Hand Strength; D006801:Humans; D008297:Male; D009203:Myocardial Infarction / Q000503:physiopathology / Q000523:psychology; D010809:Physical Fitness; D012044:Regression Analysis; D012146:Rest; D012727:Sex Characteristics; D013318:Stroke Volume