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Published on: March 27, 2018
Preoperative stroke and outcomes after coronary artery bypass graft surgery
Alex Bottle1, Abdul Mozid, Hilary P Grocott
1School of Public Health, Imperial College London, UK.
Insights
Timing of coronary artery bypass grafting (CABG) after stroke did not affect mortality or length of stay. However, a longer interval slightly increased postoperative stroke risk, while combined stroke and myocardial infarction significantly raised perioperative risk.
Area of Science:
- Cardiovascular Surgery
- Neurology
- Health Services Research
Background:
- Optimal timing for coronary artery bypass grafting (CABG) after stroke is unknown.
- Preoperative stroke is a significant risk factor for adverse outcomes in CABG patients.
Purpose of the Study:
- To investigate preoperative predictors of adverse outcomes in CABG patients.
- To determine the impact of the time interval between stroke and CABG on outcomes.
Main Methods:
- Analysis of elective CABG admissions from the Hospital Episode Statistics database (April 2006-March 2010).
- Logistic regression used to identify independent preoperative factors affecting length of stay, postoperative stroke, and mortality.
- Results presented as adjusted odds ratios (OR).
Main Results:
- Prior stroke increased mortality (OR 2.20), postoperative stroke (OR 1.99), and prolonged length of stay (OR 1.31).
- Time interval between stroke and CABG did not impact mortality or length of stay.
- A longer interval slightly increased postoperative stroke risk (OR per month 1.02).
- Combined prior stroke and myocardial infarction significantly increased death risk (OR 5.50).
- Liver disease (OR 20.8) and renal failure (OR 4.59) also prominently affected mortality.
Conclusions:
- No evidence suggests that recent preoperative stroke increases the risk of postoperative stroke, death, or prolonged stay after CABG.
- The combination of prior stroke and myocardial infarction substantially elevates perioperative risk in CABG patients.
Background:
Data are lacking on the optimal scheduling of coronary artery bypass grafting (CABG) surgery after stroke. The authors investigated the preoperative predictors of adverse outcomes in patients undergoing CABG, with a focus on the importance of the time interval between prior stroke and CABG.
Methods:
The Hospital Episode Statistics database (April 2006-March 2010) was analyzed for elective admissions for CABG. Independent preoperative patient factors influencing length of stay, postoperative stroke, and mortality, were identified by logistic regression and presented as adjusted odds ratios (OR).
Results:
In all, 62,104 patients underwent CABG (1.8% mortality). Prior stroke influenced mortality (OR 2.20 [95% CI 1.47-3.29]), postoperative stroke (OR 1.99 [1.39-2.85]), and prolonged length of stay (OR 1.31 [1.11-1.56]). The time interval between stroke and CABG did not influence mortality or prolonged length of stay. However, a longer time interval between stroke and CABG surgery was associated with a small increase in risk of postoperative stroke (OR per month elapsed 1.02 [1.00-1.04]; P = 0.047). An interaction was evident between prior stroke and myocardial infarction for death (OR 5.50 [2.84-10.8], indicating the importance of the combination of comorbidities. Prominent effects on mortality were also exerted by liver disease (OR 20.8 [15.18-28.51]) and renal failure (OR 4.59 [3.85-5.46]).
Conclusions:
The authors found no evidence that more recent preoperative stroke predisposed patients undergoing CABG surgery to suffer postoperative stroke, death, or prolonged length of stay. The combination of prior stroke and myocardial infarction substantially increased perioperative risk.
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