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Is obesity a predictor of mortality, morbidity and readmission after cardiac surgery?
Marie Antoinette J Rockx1, Stephanie A Fox, Larry W Stitt
1London Health Sciences Centre, London, Ont.
Insights
Obesity does not increase mortality or major complications after cardiac surgery, but it is linked to a higher risk of sternal dehiscence and early hospital readmission. This finding impacts patient care and risk assessment for cardiac procedures.
Area of Science:
- Cardiology
- Surgical Outcomes
- Obesity Research
Background:
- Obesity is a known risk factor for coronary artery disease.
- The association between obesity and outcomes following cardiac surgery remains unclear.
- This study investigates obesity's impact on mortality, morbidity, and readmission after cardiac operations.
Purpose of the Study:
- To determine if obesity predicts adverse outcomes after cardiac surgery.
- To assess the relationship between body mass index (BMI) and postoperative complications.
- To evaluate the effect of obesity on early hospital readmission rates.
Main Methods:
- Prospective data collection from 1310 cardiac surgery patients (July 1999 - April 2002).
- Assessment of obesity using body mass index (BMI).
- Documentation of 10 major postoperative complications and analysis of mortality, morbidity, and readmission.
Main Results:
- Increased BMI was not associated with increased early postoperative death.
- Higher BMI did not predict most major complications, except for sternal dehiscence.
- Obesity was linked to a greater likelihood of hospital readmission within 30 days.
Conclusions:
- Obesity is not linked to adverse outcomes like mortality or major complications post-cardiac surgery.
- Increased risks associated with obesity include sternal dehiscence and early hospital readmission.
- Findings suggest obesity management may be important for reducing readmissions after cardiac procedures.
Introduction:
Obesity has been described as a risk factor for the development of coronary artery disease, but it has not been determined whether obesity is associated with adverse outcomes after cardiac surgery. Therefore, we analyzed a large cohort of patients who had undergone cardiac surgery to determine whether obesity is a predictor of mortality, morbidity or early readmission to hospital.
Methods:
At the London Health Sciences Centre, an academic tertiary care centre, we prospectively entered data from the cardiac surgical database from July 1999 to April 2002. We collected data on 1310 consecutive, unselected patients who underwent cardiac surgery during that time. We assessed the degree of obesity using the body mass index (BMI), and we prospectively documented the occurrence of 10 major complications after surgery. They included stroke, reoperation for bleeding, life-threatening cardiac arrest or arrhythmia, new renal failure requiring dialysis, septicemia, mediastinitis, sternal dehiscence, respiratory failure, postoperative myocardial infarction and low cardiac output necessitating intra-aortic balloon pump use. Univariable and multivariable analyses were conducted to determine the factors associated with and predictive of postoperative death and major complications.
Results:
An increased BMI did not increase the risk of early postoperative death. Furthermore, increased BMI was not a predictor of a patient experiencing any of the major complications, except sternal dehiscence. An increased BMI was associated with a higher likelihood of readmission to hospital within 30 days of discharge.
Conclusion:
Obesity was not associated with adverse outcomes after cardiac operations, aside from the increased risks of sternal dehiscence and early hospital readmission.
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