title: Outcomes of percutaneous coronary intervention in patients ≥ 75 years: one-center study in a Chinese patient group.
abstract: OBJECTIVE
  To investigate the clinical and perioperative characteristics of patients ≥ 75 who undergoing percutaneous coronary intervention (PCI) and to evaluate the risk factors related to short-term post-PCI mortality in this specific patients group.
  
  
  METHODS
  1,035 consecutive subjects who underwent PCI from December 2011 to November 2013 were divided into four categories: (1) patients with stable angina (SA) ≥ 75 years (n = 58); (2) patients with SA < 75 years (n = 218); (3) patients with acute coronary syndrome (ACS) ≥ 75 years (n = 155); (4) patients with ACS < 75 years (n = 604). A multivariable logistic regression analysis was conducted to detect risk factors of six-month mortality in patients ≥ 75 years who had undergone PCI. Clinical comorbidities, in-hospital biochemical indicators, perioperative data, in-hospital and six-month outcomes were analyzed and compared among the four groups.
  
  
  RESULTS
  Compared with the younger group, patients ≥ 75 years were more likely to have hypertension, history of stroke, chronic obstructive pulmonary disease, peripheral vascular disease, cardiogenic shock and malignant arrhythmia, and they were admitted to hospital with relative lower weight, hemoglobin, albumin, triglyceride, higher creatinine, uric acid, urea nitrogen and pro-BNP. Left main artery lesions, multi-vessel, calcified lesions, chronic totally occlusion were also more likely to be seen in the elderly group. Univariate analysis revealed that age ≥ 85 years, cardiogenic shock or severe arrhythmia at admission, emergency PCI, prior stroke and chronic kidney disease were related to six-month mortality in elderly patients ≥ 75 years who underwent PCI. Multivariable logistic regression showed that cardiogenic shock or severe arrhythmia at admission, chronic kidney disease and prior stroke were independent risk factors predicting six-month mortality in elderly patients ≥ 75 years who had undergone PCI.
  
  
  CONCLUSIONS
  Our data showed that, compared with patients under 75 years, elderly patients (≥ 75 years) who had undergone PCI had a relative higher risk of mortality, and more often accompanied with multi-comorbidities, severer admission conditions and complex coronary lesions. Better evaluation of risk factors and more intensively care should be taken to patients ≥ 75 years who had undergone PCI therapy to reduce complications.
authors.affiliation: Departmentof Cardiology, Shanghai Changzheng Hospital, Shanghai, China; Department of cardiology, the 309th Hospital of Chinese People's Liberation Army, Beijing, China.
authors.forename: Peng-Fei
authors.initials: PF
authors.lastname: Chen
authors.affiliation: Departmentof Cardiology, Shanghai Changzheng Hospital, Shanghai, China.
authors.forename: Dan-Ning
authors.initials: DN
authors.lastname: Wang
authors.affiliation: Departmentof Cardiology, Shanghai Changzheng Hospital, Shanghai, China.
authors.forename: Kan
authors.initials: K
authors.lastname: Chen
authors.affiliation: Departmentof Cardiology, Shanghai Changzheng Hospital, Shanghai, China.
authors.forename: Chun
authors.initials: C
authors.lastname: Liang
authors.affiliation: Departmentof Cardiology, Shanghai Changzheng Hospital, Shanghai, China.
authors.forename: Yu-Sheng
authors.initials: YS
authors.lastname: Reng
authors.affiliation: Departmentof Cardiology, Shanghai Changzheng Hospital, Shanghai, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Yang
authors.affiliation: Departmentof Cardiology, Shanghai Changzheng Hospital, Shanghai, China.
authors.forename: Ru
authors.initials: R
authors.lastname: Ding
authors.affiliation: Wake Forest School of Medicine, Winston-Salem, NC, USA.
authors.forename: Jacob
authors.initials: J
authors.lastname: Blackwell
authors.affiliation: Departmentof Cardiology, Shanghai Changzheng Hospital, Shanghai, China.
authors.forename: De-Ning
authors.initials: DN
authors.lastname: Liao
keywords: Outcome; Percutaneous coronary intervention; The elderly