title: Body mass index and preinfarction angina in elderly patients with acute myocardial infarction.
abstract: BACKGROUND
  Preinfarction angina, a clinical equivalent of ischemic preconditioning, seems to protect against in-hospital death, cardiogenic shock, and the combined endpoints in adult but not in elderly patients with acute myocardial infarction. Experimental evidence indicates that caloric restriction may restore ischemic preconditioning in aged animals.
  
  
  OBJECTIVE
  The objective was to verify whether body mass index (BMI) influences the cardioprotective effect of preinfarction angina in the elderly.
  
  
  METHODS
  We retrospectively studied 820 patients aged >/= 65 y with acute myocardial infarction by evaluating BMI and major (death and cardiogenic shock) and minor in-hospital outcomes.
  
  
  RESULTS
  In-hospital death, cardiogenic shock, and the combined endpoints were not significantly different between elderly patients with and without preinfarction angina. Interestingly, in-hospital death, cardiogenic shock, and the combined endpoints were significantly fewer in elderly patients with than without preinfarction angina in the subset of patients with the lowest BMI (P < 0.01, < 0.01, and < 0.01, respectively). Regression analysis showed that preinfarction angina did not protect against in-hospital death when analyzed in all patients independently of BMI, whereas it was protective in the subset of patients with the lowest BMI (odds ratio: 0.06; 95% CI: 0.00, 0.54).
  
  
  CONCLUSIONS
  Preinfarction angina does not protect against in-hospital death, cardiogenic shock, or the combined endpoints in elderly patients with acute myocardial infarction. With stratification by quartiles of BMI, the protective effect of preinfarction angina is preserved in elderly patients with the lowest BMI.
authors.affiliation: Cattedra di Geriatria, Dipartimento di Medicina Clinica, Scienze Cardiovascolari ed Immunologiche, Università degli Studi di Naples Federico II, Naples, Italy. p.abete@unina.it
authors.forename: Pasquale
authors.initials: P
authors.lastname: Abete
authors.forename: Francesco
authors.initials: F
authors.lastname: Cacciatore
authors.forename: Nicola
authors.initials: N
authors.lastname: Ferrara
authors.forename: Claudio
authors.initials: C
authors.lastname: Calabrese
authors.forename: Domenico
authors.initials: D
authors.lastname: de Santis
authors.forename: Gianluca
authors.initials: G
authors.lastname: Testa
authors.forename: Gianluigi
authors.initials: G
authors.lastname: Galizia
authors.forename: Stefania
authors.initials: S
authors.lastname: Del Vecchio
authors.forename: Dario
authors.initials: D
authors.lastname: Leosco
authors.forename: Mario
authors.initials: M
authors.lastname: Condorelli
authors.forename: Claudio
authors.initials: C
authors.lastname: Napoli
authors.forename: Franco
authors.initials: F
authors.lastname: Rengo
mesh_terms: D000368:Aged; D000789:Angina, Unstable / Q000150:complications*; D015992:Body Mass Index; D003325:Coronary Care Units; D005260:Female; D005853:Geriatrics; D017052:Hospital Mortality; D006801:Humans; D008297:Male; D009203:Myocardial Infarction / Q000150:complications*