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Risk factors for postoperative morbidity

V A Ferraris1, S P Ferraris

  • 1Division of Cardiothoracic Surgery, Albany Medical College, N.Y, USA.

The Journal of Thoracic and Cardiovascular Surgery
|April 1, 1996
PubMed
Summary
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Older patients with anemia and low blood volume undergoing coronary artery bypass grafting face higher risks of postoperative complications. Identifying these risk factors can help target interventions to reduce morbidity.

Area of Science:

  • Cardiovascular Surgery
  • Medical Statistics
  • Patient Outcomes Research

Background:

  • Coronary artery bypass grafting (CABG) outcomes analysis traditionally focuses on operative mortality.
  • Nonfatal perioperative morbidity is more common and costly after CABG than mortality.

Purpose of the Study:

  • To identify preoperative risk factors associated with postoperative morbidity after CABG.
  • To differentiate risk factors for morbidity from those for mortality.

Main Methods:

  • Multivariate statistical analysis of 938 patients undergoing CABG.
  • Evaluation of preoperative patient variables for association with morbidity and length of stay.
  • Stepwise Cox regression analysis to identify independent predictors.

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Main Results:

  • Key risk factors for increased length of stay and morbidity included Age/RBCVOL (age divided by red blood cell volume), congestive heart failure, hypertension, peripheral vascular disease, COPD, and renal dysfunction.
  • Age/RBCVOL was a significant predictor for both increased length of stay and serious postoperative morbidity.
  • Risk factors for mortality (e.g., preoperative shock, redo operation) differed from those for morbidity.

Conclusions:

  • Risk factors for postoperative morbidity after CABG are distinct from those for mortality.
  • Older patients with preoperative anemia and comorbidities are at higher risk for complications.
  • Identification of high-risk patients allows for targeted interventions to reduce postoperative morbidity.