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Correlation between pre-operative metabolic syndrome and persistent blood glucose elevation during cardiac surgery in non-diabetic patients

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Abstract:

Background:

Cardiopulmonary-bypass (CPB) induces hyperglycemia. There is growing evidence that perioperative maintenance of blood glucose within the physiological range improves patients' outcome. Nevertheless, perioperative normoglycemia is often difficult to achieve during surgery with CPB and the response to insulin infusion is characterized by a considerable variability. The aim of this study was to determine to what extent the presence of pre-operative metabolic syndrome (MS) influences the blood glucose and insulin response during cardiac surgery. Methods:

Forty-five patients scheduled for elective cardiac surgery were screened for the presence of MS according to the International Diabetes Federation definition. Patients were then assigned to two groups: those with metabolic syndrome (MSP) and those without (control). During surgery, blood glucose levels were measured in all patients and hyperglycemia was treated with a standard protocol of continuous insulin infusion. Results:

The mean blood glucose levels during CPB increased only in the MSP group (P<0.001). Mean blood glucose in control patients did not increase during CPB (P=0.4). Patients with MS received 13.3±8.4 IU of insulin during CPB, while the control group did not require insulin treatment (P<0.001). Forty percent of patients in the control group and 100% of those in the MSP group developed post-operative insulin resistance. C-reactive protein was higher in the MSP group before, during and at 48 h after surgery. Conclusions:

The mean blood glucose levels during CPB increased only in patients with MS, while they remained unchanged in patients in the control group.

Keywords: Metabolic syndrome; cardiopulmonary bypass

Document Type: Research Article

DOI: http://dx.doi.org/10.1111/j.1399-6576.2008.01693.x

Affiliations: 1: Department of Anesthesia, Ospedali Riuniti di Bergamo, Bergamo, Italy, 2: Universita di Milano, Bicocca, Italy and 3: Department of Anesthesia, McGill University, Montreal, Canada

Publication date: September 1, 2008

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