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Ann Thorac Surg 2001;72:776-781
© 2001 The Society of Thoracic Surgeons
a Cardiopulmonary Research Science and Technology Institute, Dallas, Texas, USA
Address reprints requests to Dr Magee, 7777 Forest Lane, Suite A323, Dallas, TX 75230
e-mail: mmagee{at}csant.com
Presented at the Forty-seventh Annual Meeting of the Southern Thoracic Surgical Association, Marco Island, FL, Nov 911, 2000.
| Abstract |
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Methods. From January 1995 through December 1999, 9,965 patients, of whom 2,891 (29%) had diabetes, underwent isolated coronary artery bypass grafting. Diabetic and nondiabetic patients were further divided into groups on the basis of cardiopulmonary bypass use. Twelve percent (346 of 2,891) of diabetic patients and 12% (829 of 7,074) of nondiabetic patients underwent coronary artery bypass grafting without cardiopulmonary bypass; the remainder had coronary artery bypass grafting with cardiopulmonary bypass. Nineteen preoperative variables were compared among treatment groups by univariate analysis.
Results. Patients undergoing coronary artery bypass grafting without cardiopulmonary bypass compared with those having coronary artery bypass grafting with cardiopulmonary bypass had higher mean predicted mortalities (diabetic, 3.96% versus 3.72%, p = 0.83; nondiabetic, 3.03% versus 2.86%, p = 0.79). In nondiabetic patients, coronary artery bypass grafting without cardiopulmonary bypass provides an actual and risk-adjusted survival advantage over coronary artery bypass grafting with cardiopulmonary bypass (1.81% versus 3.44%, p = 0.0127; risk-adjusted mortality, 1.79% versus 3.61%, p = 0.007). This survival benefit of coronary artery bypass grafting without cardiopulmonary bypass was not seen in diabetic patients (2.89% versus 3.69%, p = 0.452; risk-adjusted mortality, 2.19% versus 2.98%, p = 0.42). Diabetic patients undergoing coronary artery bypass grafting without cardiopulmonary bypass had fewer complications, including decreased blood product use (34.39% versus 58.4%, p = 0.001), and reduced incidence of prolonged ventilation (6.94% versus 12.10%, p = 0.005), atrial fibrillation (15.90% versus 23.26%, p = 0.002), and renal failure requiring dialysis (0.87% versus 2.75%, p = 0.036).
Conclusions. The survival advantage in nondiabetic patients treated with coronary artery bypass grafting without cardiopulmonary bypass is not apparent in diabetic patients. Coronary artery bypass grafting without cardiopulmonary bypass in diabetic patients is nevertheless associated with a significant reduction in morbidity.
| Introduction |
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| Patients and methods |
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Procedure selection was at the discretion of the operating surgeon and varied accordingly. No specified selection criteria were used in determining which CABG procedure, with or without CPB, individual patients would receive, although medical comorbidities considered to increase the risks of CPB were generally used to select patients for OPCABG. The CABG-CPB and OPCABG patients were contemporaneous and not sequential cohorts.
Patient data were collected and analyzed according to the STS National Cardiac Surgery Database guidelines and definitions (http://www.ctsnet.org/doc/4314). Preoperative patient data were obtained relative to cerebrovascular disease, chronic obstructive pulmonary disease, cerebrovascular accident, hypertension, morbid obesity, peripheral vascular disease, renal failure, renal failure on dialysis, sex, current smoking, unstable angina, recent myocardial infarction (MI), arrhythmias, congestive heart failure, left main coronary artery disease, New York Heart Association class IV classification, age, and left ventricular ejection fraction. Postoperative data collected and compared between groups included length of hospital stay from operation to discharge, operative mortality, blood product use, reoperation for bleeding, MI, adult respiratory distress syndrome, prolonged ventilation, renal failure, renal failure requiring dialysis, transient and permanent neurologic dysfunction, infection, and atrial fibrillation.
Statistical analysis
Patients were grouped and compared according to preoperative disease status, diabetic versus nondiabetic, and according to surgical treatment, OPCABG versus CABG-CPB. Preoperative patient characteristics, intraoperative course, and operative outcomes were collected and compared among groups using either the
2 test or two-tailed Students t test as appropriate. Probability values less than or equal to 0.05 were considered significant.
The predicted risk of operative mortality was calculated for each patient using the STS algorithm, and mean predicted risk scores were calculated for each group for comparison.
| Results |
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The unadjusted and risk-adjusted mean operative mortality was less in the OPCABG group compared with the CABG-CPB group. This survival benefit of OPCABG was highly significant in the nondiabetic patients (Table 3).
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| Comment |
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During the period of study, diabetic patients as a group selected for OPCABG were older, more often female, and with renal impairment in accordance with higher risk status, but less often obese and less likely to have left main coronary artery disease, recent MI, or unstable angina. These differences in risk factors trended toward a higher overall mean predicted risk for the OPCABG group, although statistically the groups were similar. In nondiabetic patients, identical disparities noted above existed between therapeutic groups, with the addition of less hypertension, chronic obstructive pulmonary disease, and preoperative arrhythmias in the OPCABG group. Again these differences yielded a higher mean predicted risk score in the OPCABG group although the groups were statistically identical.
This study did not exclude single-vessel disease. Both diabetic and nondiabetic OPCABG groups had a lower mean number of grafts per patient than their CABG-CPB cohorts (diabetic, 2.3 versus 3.5; nondiabetic, 2.2 versus 3.4, respectively). This is largely a reflection of a much higher proportion of single CABG procedures in the OPCABG groups (diabetic, 0.347 versus 0.014; nondiabetic, 0.391 versus 0.028). The similarity in predicted risk scores among treatment groups, trending toward a higher risk in the OPCABG groups, argues against this having a favorable impact on OPCABG outcomes. Fewer mean grafts per patient may reflect an OPCABG selection bias for patients who require fewer grafts. Alternatively, surgeons performing OPCABG may have a surgeon-specific propensity to perform fewer grafts independent of the selected approach or may be influenced by procedure-related technical challenges to perform fewer grafts. The limitations of this database do not allow for precise anatomic characterization of preoperative coronary artery disease and the corresponding grafts required to achieve complete revascularization. Therefore, no conclusions can be drawn from this data as to the relative completeness of revascularization among groups.
Nondiabetic patients clearly derive a significant benefit from an OPCABG approach reflected in decreased unadjusted and risk-adjusted mortality as well as decreased morbidity, including decreased blood product use, decreased incidence of adult respiratory distress syndrome and prolonged ventilation, and decreased postoperative hospital length of stay.
It is unclear why diabetic patients do not derive the same benefits from OPCABG as nondiabetic patients. There may be factors with higher prevalence in the diabetic population, such as diffuse small vessel coronary artery disease, renal insufficiency, peripheral vascular disease, or other confounding risk variables that affect these findings. The diabetic treatment groups are smaller than the nondiabetic groups and may simply not be large enough to reflect a survival benefit.
Narrowing the analysis to include only treated diabetic patients, either with oral medication or insulin, or further narrowing the comparison to include only insulin-treated diabetic patients resulted in conclusions similar to those drawn from the entire diabetic population. Likewise, adjusting for differences in risk between diabetic treatment groups by comparing mean risk-adjusted mortalities did not alter the conclusion. Diabetic OPCABG patients as a group, compared with CABG-CPB, do benefit from less blood product use, less incidence of prolonged ventilation, less incidence of postoperative renal failure requiring dialysis, and less postoperative atrial fibrillation. This was reflected in a trend toward a decreased postoperative length of hospital stay.
In conclusion, OPCABG provides a significant survival advantage in nondiabetic patients. Off-pump CABG in diabetic patients and nondiabetic patients is associated with a significant reduction in morbidity. Additional studies including larger numbers of diabetic patients or prospective randomization are needed to confirm these conclusions.
| Discussion |
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I only have one question for you, and that is whether you subgrouped your diabetics into those patients on oral agents versus insulin agents? Historically there are some data that suggest that patients on oral agents do less well with myocardial type events, both with myocardial infarction and with operation. Our laboratory published data some years ago at the basic science level describing differences in the way human cardiac muscle behaves in oral-dependent diabetics versus insulin-dependent diabetics. We subsequently learned that the oral agents worked by inhibiting the potassium ATP channel, which is thought to be an endogenous cardiac protector. If there is a difference between the group that was taking oral agents versus insulin agents, it could be the oral group that could be responsible for your lack of benefit. Otherwise I think this is a beautifully presented talk and very relevant, solid data.
DR MAGEE: Thank you for your comments. We did in fact look at the insulin dependence of the patients, and you can see, as it is broken down in this slide, that the total number of insulin-dependent patients was 35% of the total population. That represented about 40% of the off-pump group and about 35% of the on-pump group, which was not statistically significant. In looking at morbidity and mortality differences, it did not differ at all from the total population.
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