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CARDIOVASCULAR ANESTHESIA

Maintenance of Normoglycemia During Cardiac Surgery

George Carvalho, MD^*, Anne Moore, MD^*, Baqir Qizilbash, MD^*, Kevin Lachapelle, MD, and Thomas Schricker, MD PhD^*

Departments of *Anesthesia and Cardiac Surgery, Royal Victoria Hospital, McGill University Health Center, Montreal, Quebec, Canada

Address correspondence and reprint requests to George Carvalho and Thomas Schricker, Department of Anesthesia, McGill University, Royal Victoria Hospital, Room S5.05, 687 Pine Ave. West, Montreal, Quebec, Canada H3A 1A1. Address e-mail to thomas.schricker{at}mcgill.ca

	Abstract

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We used the hyperinsulinemic normoglycemic clamp technique, i.e., infusion of insulin at a constant rate combined with dextrose titrated to clamp blood glucose at a specific level, to preserve normoglycemia during elective cardiac surgery. Ten nondiabetic and seven diabetic patients entered the clamp protocols. Perioperative glucose control was also assessed in 19 nondiabetic and 11 diabetic patients (control group) receiving a conventional insulin infusion sliding scale. In patients of the clamp group, a priming bolus of insulin (2 U) was started before the induction of anesthesia followed by infusions of insulin at 5 mU · kg^–1 · min^–1 and of variable amounts of dextrose. Arterial blood glucose was measured every 5 min in the clamp group and every 20 min in the control group. Control of normoglycemia was defined as 95% of the glucose levels within 4.0–6.0 mmol/L. Glucose concentration was recorded before surgery, 15 min before cardiopulmonary bypass (CPB), during early and late CPB, and at sternal closure. Patients of the control group became progressively hyperglycemic during surgery (late CPB; nondiabetics, 9.0 ± 3.2 mmol/L; diabetics, 10.1 ± 3.6 mmol/L), whereas normoglycemia was achieved in the study group (late CPB; nondiabetics, 5.5 ± 0.7 mmol/L; diabetics, 4.9 ± 0.6 mmol/L; P < 0.05 versus control group). In conclusion, it seems that normal blood glucose concentration during open heart surgery can be reliably maintained in nondiabetic and diabetic patients by using the hyperinsulinemic normoglycemic clamp technique.

IMPLICATIONS: The hyperinsulinemic normoglycemic clamp can be used to preserve normoglycemia during open heart surgery. This technique in combination with a continuous intravenous glucose monitoring system may be applied in future studies to investigate the effect of aggressive intraoperative glucose control on outcome after cardiac surgery.

	Introduction

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There is growing evidence that aggressive maintenance of blood glucose within the physiological range is an essential component of perioperative care. Hyperglycemia during cardiac procedures and cardiopulmonary bypass (CPB) is severe, with plasma glucose levels often exceeding 15.0 mmol/L, particularly in diabetic patients who comprise a significant percentage of the cardiac surgery patient population (1). These alterations in glucose metabolism are related, in part, to the metabolic response to surgical trauma but mostly to specific aspects of CPB, such as heparinization (2), hypothermia (3), and rewarming (4). The etiology of the disturbance of the plasma glucose-insulin relationship, which consistently occurs during CPB, includes inadequate insulin secretion, stimulated endogenous glucose production, decreased total body glucose uptake (5,6), enhanced renal absorption of filtered glucose (7), and decreased exogenous insulin activity (8).

In critically ill patients admitted to a surgical intensive care unit (ICU), most after cardiac surgery, normalization of blood glucose between 4.0 and 6.0 mmol/L reduced morbidity (sepsis and renal failure) and decreased inhospital mortality by 40% (9). However, early mortality was not affected in this study population, perhaps because normoglycemia was only achieved within the first 12–24 h after surgery (10). Therefore, that study did not account for the changes in glucose metabolism during surgery and subjected patients to a prolonged period of hyperglycemia during and after surgery.

Notwithstanding the adverse clinical effects of hyperglycemia on neurological outcome (11), incidence of infection (12), renal failure (13), and mortality (14) in patients undergoing cardiac procedures requiring CPB, perioperative normoglycemia cannot be reliably achieved, despite the use of large doses of insulin (15–17). The sole study in the literature, which was successful in preserving normoglycemia, was performed in nondiabetic patients only (8). It also was conducted under experimental conditions, i.e., the study was started hours before the operation with the aid of the Biostator©, a glucose controlled insulin infusion system that is cumbersome and no longer commercially available (8).

In this pilot study, we present the results of a preemptive strategy to maintain normoglycemia during cardiac surgery using the hyperinsulinemic normoglycemic clamp. With this technique, insulin is infused at a constant rate to increase plasma insulin, and, concurrently, IV glucose is titrated to clamp the blood glucose concentration at a specific level (18). We hypothesized that this method could be used to preserve normal blood glucose concentrations in diabetic and nondiabetic patients during open-heart surgery requiring CPB.

	Methods

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After discussion with the ethics committee of our hospital, we felt that this prospective audit did not require IRB approval or patient consent. Ten nondiabetic and seven diabetic patients scheduled for elective cardiac surgery requiring CPB at the Royal Victoria Hospital, Montreal, entered the clamp protocols. In a previous prospective study, we had assessed the perioperative glucose control in 19 nondiabetic and 11 diabetic patients (control group). In those patients, we attempted to maintain normoglycemia by using a conventional insulin infusion sliding scale as outlined below. Patients were deemed diabetic if they had diabetes and were actively treated with diet, oral hypoglycemic drugs, or insulin.

Administration of all concurrent cardiac medications was continued until the time of operation. Administration of oral hypoglycemic drugs was discontinued 24 h before surgery, and a sliding scale insulin regimen was ordered. All patients received prophylactic perioperative antibiotics (vancomycin 1 g preincision and 500 mg post-CPB) in a solution free of glucose. Anesthetic and surgical treatment was performed following the standards established in our institution. All patients received a total IV anesthetic using sufentanil, midazolam, and pancuronium. CPB was conducted with a roller pump and a membrane oxygenator primed with a solution consisting of 1 L of Ringer’s lactate solution, 5000 IU of heparin, 750 mL of pentaspan, 44 mEq of bicarbonate, and 2 x 10⁶ kIU of aprotinin. Immediately before CPB, heparin 400 IU/kg was given IV followed by additional doses, if required, to maintain an activating clotting time >500 s. During CPB, pump flow was set at 2.4 L/min times the body surface area, and mean arterial blood pressure was maintained between 50 and 60 mm Hg. Temperature was allowed to drift with active rewarming at the end of CPB. Cardioplegia was free of glucose and consisted of large-dose (100 mEq/L) and small-dose (40 mEq/L) potassium used at the discretion of the cardiac surgeon. After CPB, protamine was administered as 1 mg/100 IU of the heparin dose. Separation from CPB was attempted without use of inotropes, although if required, epinephrine or norepinephrine were used.

Before the induction of anesthesia, a baseline blood glucose value was obtained. If the blood glucose at this time was <8.0 mmol/L, subsequent blood glucose measurements were performed immediately before CPB (pre-CPB), 15 min after the initiation of CPB (early CPB), approximately 15 min before separation from CPB (late CPB), and at the time of sternal closure. At any of these measurements, if the blood glucose was 8.0 mmol/L, an insulin (Humulin® R, Eli Lilly and Company, Indianapolis, IN) infusion of 2 U/h was started, and blood glucose was measured every 20 min until the end of the surgery. The insulin infusion was then adjusted according to the following sliding scale to a maximum of 20 U/h:

Blood glucose: action

<4.0 mmol/L: administer 25 mL of dextrose 50%/stop infusion

4.0–8.0 mmol/L: maintain current infusion rate if rate <8 U/h/if infusion rate 8 U/h set rate at 6 U/h

8.1–10.0 mmol/L: increase infusion by 2 U/h

10.1–12.0 mmol/L-increase infusion by 4 U/h

12.1–14.0 mmol/h-increase infusion by 6 U/h

>14.0 mmol/h-increase infusion by 8 U/h

Before the induction of anesthesia, a baseline blood glucose value was obtained. A 2-U priming bolus of insulin was followed by an insulin infusion of 5 mU · kg^–1 · min^–1. Additional boluses of insulin were given during the equilibration period before CPB if the blood glucose remained >6.0 mmol/L according to the following sliding scale:

Blood glucose:action

6.1–8.0 mmol/L: 2 U of insulin IV

8.1–10.0 mmol/L: 4 U of insulin IV

10.1–12.0 mmol/L: 6 U of insulin IV

12.1–14.0 mmol/h: 8 U of insulin IV

>14.0 mmol/h: 10 U of insulin IV

Ten minutes after commencing the insulin infusion and when the blood glucose was <6.0 mmol/L, a variable continuous infusion of glucose (dextrose 20%) supplemented with potassium (40 mEq/L) and phosphate (30 mmol/L) was administered to preserve normoglycemia (4.0–6.0 mmol/L) (18). The glucose infusion was started at 60 mL/h in nondiabetics and 30 mL/h in diabetics. The insulin infusion was discontinued at sternal closure. Arterial blood glucose was measured every 5 to 10 min throughout the procedure with the Accu-Chek® glucose monitor (Roche Diagnostics, Switzerland). Hyperglycemia was defined as blood glucose >6.0 mmol/L. Hypoglycemia was defined as blood glucose <3.5 mmol/L. Successful control of normoglycemia was defined as >95% of the glucose levels obtained after an equilibration period of 60 min within the target range of 4.0–6.0 mmol/L. Glucose infusion rates were recorded immediately before (pre-CPB), 15 min after CPB (early CPB) was started, approximately 15 min before the end of CPB (late CPB), during sternal closure, at the arrival in the ICU, and 2 h thereafter.

The Mann-Whitney U-test was used for power analysis and comparison between the two groups. Within-group comparison in the control groups was made by analysis of variance for repeated blood glucose measurements followed by post hoc analysis by Student-Newman-Keuls test. Differences were judged statistically significant if P was 0.05 or less. Sample size calculation was based on the assumption that patients receiving the hyperinsulinemic normoglycemic clamp, in contrast to patients receiving the insulin sliding scale infusion, would show a normal blood glucose concentration during late CPB (this is the time when the perioperative changes in blood glucose concentration are most pronounced). On the basis of our previous studies in nondiabetic subjects receiving insulin according to a sliding scale (Fig. 1), a blood glucose concentration that was at least 2.0 mmol/L less in the hyperinsulinemic normoglycemic clamp group would require a sample size of 10 patients to detect a difference between groups at = 5% and power = 80%. On the basis of our previous studies in diabetic subjects receiving the insulin sliding scale (Fig. 1) a blood glucose concentration that was at least 3.0 mmol/L smaller in the hyperinsulinemic normoglycemic clamp group would require a sample size of 7 patients to detect a difference between groups at = 5% and power = 80%.

View larger version (17K): [in this window] [in a new window]   Figure 1. Blood glucose concentrations in the two control groups (nondiabetic group, n = 19; diabetic group, n = 11; CPB = cardiopulmonary bypass, pre-CPB = immediately before CPB, early CPB = 15 min after the initiation of CPB, and late CPB = 15 min before separation from CPB). Data are presented as mean ± SD.

	Results

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View larger version (29K): [in this window] [in a new window]   Figure 2. Blood glucose concentrations (squares) and glucose infusion rates (bars) during cardiac surgery in the two clamp groups (nondiabetic group, n = 10; diabetic group, n = 7; CPB = cardiopulmonary bypass, pre-CPB = immediately before CPB, early CPB = 15 min after the initiation of CPB, late CPB = 15 min before separation from CPB, ICU = at the arrival in the intensive care unit). Data are presented as mean ± SD.

	Discussion

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In the present protocol, the insulin dose of 5 mU · kg^–1 · min^–1 was chosen because it totally suppresses endogenous glucose production and optimizes glucose use in normal subjects and in subjects with impaired glucose tolerance (19). At larger doses, glucose uptake by insulin-dependent tissues, i.e., muscle and to a lesser degree liver and adipose tissue, is not substantially more in normal subjects (19) or in diabetic patients (20,21). For these reasons, we set our maximum insulin infusion rate at 20 U/h in the control group.

The failure of earlier attempts to maintain normoglycemia during cardiac surgery can be explained by inadequate dosage and timing of insulin (15–17). The most intensive of protocols proposed by Chaney et al. (15), initially infused insulin at 2 U/h corresponding to 0.5 mU · kg^–1 · min^–1 in a 70-kg patient. Insulin administered at that rate, resulting in a plasma insulin level of approximately 50 µg/mL, does not completely suppress endogenous glucose production (19). CPB leads to a major counter-regulatory hormone surge with subsequent stimulation of glucose production and hyperglycemia (4,22). This is accompanied by an insulin-resistant state initiated by counter-regulatory hormones and further enhanced by hypothermia and hypoperfusion of the peripheral muscle mass during CPB. According to the protocol of Chaney et al. (15), large doses of insulin were administered during that period but were ineffective. Furthermore, once patients were rewarmed, the massive doses of insulin administered too late began to take effect, and hypoglycemia was not unexpectedly observed in the postoperative period. The results of our study indicate that overcoming the initial insulin resistance, particularly in diabetic patients, and suppressing any subsequent metabolic derangement (22) before initiation of CPB was fundamental in achieving normoglycemia.

Our results indicate that prolongation of the insulin-glucose clamp allows glucose infusion rates in diabetic patients to approach those of nondiabetics. This is consistent with previous observations demonstrating that insulin-mediated glucose disposal in obese and noninsulin dependent diabetics is delayed but seems to normalize after several hours of insulin infusion (23). Conversely, our results may be interpreted to show that diabetic subjects, after the initial period of normalization when treated with large-dose insulin, were insulin resistant to the same degree thereafter because the glucose infusion rates remained about the same. However, the nondiabetic group started with a normal glucose tolerance and became insulin resistant as a consequence of cardiac surgery. Regardless of the interpretation, the dynamics of glucose metabolism in our study imply that diabetic patients may benefit from an earlier start of insulin administration to maximize myocardial glucose uptake before the ischemia of CPB.

There has been considerable interest in the concept of perioperative myocardial protection by large doses of glucose, insulin, and potassium (GIK) with the provision of glucose as a substrate for the period of ischemia and reperfusion. The results of these studies have revealed conflicting results (24,25), which may in part be explained by the detrimental effects of hyperglycemia. The hyperinsulinemic normoglycemic clamp is essentially a GIK infusion and may serve to further study GIK therapy without the potential adverse effects of hyperglycemia.

The interactions between glucose metabolism and elements of cardiac surgery, including anesthesia, surgical stress, heparinization, CPB, cardioplegia, body temperature fluctuations, and inotropic support, are so complex that optimal control cannot be expected to be achieved with occasional measurements of blood glucose. Normoglycemia is not achievable with reactive protocols because they permit and then react to hyperglycemia. This situation is no different than that of outpatient diabetic patients who achieve tight glucose control by preemptive administration of insulin before the glucose load of a meal. Our results confirm that maintenance of normoglycemia during cardiac surgery can be achieved in a predictable and reliable fashion by using a hyperinsulinemic normoglycemic clamp technique, whether patients are diabetic or nondiabetic. Routine use of this technique is made difficult by the frequency of blood samplings to adjust the glucose infusion rate. Combining the hyperinsulinemic normoglycemic clamp technique with a continuous IV glucose monitoring device would obviate the need for frequent glucose measurements and, thus, would make this practice safer and available to more patients. It remains to be investigated if tight perioperative glucose control in patients undergoing cardiac surgery will result in better outcome, i.e., a reduction in major morbidities including infection, renal and neurological dysfunction, an improvement in cardiac performance, and a decrease in the length of ICU and/or hospital stay.

	References

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This Article Abstract Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Email this article to a colleague Similar articles in this journal Similar articles in ISI Web of Science Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via ISI Web of Science (26) Citing Articles via Google Scholar Google Scholar Articles by Carvalho, G. Articles by Schricker, T. Search for Related Content PubMed PubMed Citation Articles by Carvalho, G. Articles by Schricker, T. Related Collections Cardiovascular Heart Complications Monitoring (Non-cardiac)

Anesthesia & Analgesia® is published for the International Anesthesia Research Society® by Lippincott Williams & Wilkins with the assistance of Stanford University Libraries' HighWire Press®. Copyright 2006 by the International Anesthesia Research Society. Online ISSN: 1526-7598   Print ISSN: 0003-2999