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Hormonal and Metabolic Responses to Glucose Infusion in Sepsis Studied by the Hyperglycemic Glucose Clamp Technique

University of Melbourne, Department of Surgery, St. Vincent's Hospital, Fitzroy 3065, Australia

Keith N. Frayn, PH.D.

MRC Trauma Unit, University of Manchester, Manchester, United Kingdom, Sheikh Rashid Diabetes Unit. Radcliffe Infirmary, Oxford, U.K.

Roderick A. Little, PH.D.

MRC Trauma Unit, University of Manchester, Manchester, United Kingdom

Cedric J. Threlfall, B.SC.

MRC Trauma Unit, University of Manchester, Manchester, United Kingdom

H.B. Stoner, F.R.C.S.

MRC Trauma Unit, University of Manchester, Manchester, United Kingdom

Miles H. Irving, F.R.C.S.

Department of Surgery (University of Manchester School of Medicine), Hope Hospital, Salford

Although nutritional support is vital to treatment of severe sepsis, the septic patient does not respond normally to glucose infusion. We have used the hyperglycemic glucose clamp technique to investigate the initial hormonal and metabolic responses of the septic patient to glucose under controlled conditions. The plasma glucose concentration was raised to and maintained at 12 mmol/liter for 2 hr in 12 septic patients and 11 normal controls. Glucose utilization, assessed from the amount infused, was significantly depressed in the patients, despite similar plasma insulin concentrations in the two groups. Forearm glucose uptake was similarly impaired. Despite very similar plasma free fatty acid concentrations in the two groups, which were suppressed equally by the glucose infusion, whole-body fat oxidation was elevated in the patients compared with the controls, and suppressed to a lesser extent in response to glucose. Glycerol and ketone body concentrations were elevated in the patients in keeping with a picture of accelerated release, clearance, and oxidation of fatty acids.

Plasma cortisol, epinephrine, and norepinephrine concentrations were elevated in the septic patients in a severity-related manner, but not to high levels compared with experimental work. Norepinephrine showed no response to the glucose infusion in either group. Plasma glucagon concentrations were not significantly elevated in the septic patients.

We conclude that the hyperglycemic glucose clamp provides a useful model for studying glucose intolerance in sepsis. Impaired glucose utilization in septic patients is associated with increased fat oxidation, although the hormonal basis for these changes is still unclear. (Journal of Parenteral and Enteral Nutrition 11: 345-353, 1987)

Journal of Parenteral and Enteral Nutrition, Vol. 11, No. 4, 345-353 (1987)
DOI: 10.1177/0148607187011004345


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