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Glucose Response to Abrupt Initiation and Discontinuation of Total Parenteral Nutrition

Department of Surgery, Medical College of Wisconsin, Milwaukee

Deborah A. Andris, RN, BSN, CNSN

Department of Surgery, Medical College of Wisconsin, Milwaukee

Julianne K. Whipple, PHARMD

Department of Surgery, Medical College of Wisconsin, Milwaukee

Carole C. Street, BS

Department of Surgery, Medical College of Wisconsin, Milwaukee

Robert K. Ausman, MD, PHD

Department of Surgery, Medical College of Wisconsin, Milwaukee

William J. Schulte, MD

Department of Surgery, Medical College of Wisconsin, Milwaukee

Edward J. Quebbeman, MD, PHD

Department of Surgery, Medical College of Wisconsin, Milwaukee

Plasma glucose was studied during the initiation of total parenteral nutrition (TPN) and the discontinuation of TPN without a tapering schedule. Blood was sampled every 5 minutes for 2 hours after the start of TPN and 1 week later as TPN was discontinued. A total of 14 initiations and 14 discontinuations were studied in 18 patients. Severity of illness in patients ranged from stable condition postoperatively to multiple-system failure; six patients had diabetes mellitus. The TPN solution was a 3:1 admixture that provided a caloric intake equal to 1.2 times the resting energy expenditure, with 40% fat and 60% carbohydrate calories. An average of 1963 kcal was provided per day (340 g of glucose, 79 g of fat). During the initiation phase, the mean increase in plasma glucose was 60 mg/dL. The increase for diabetic patients was 79 ± 14 mg/dL compared with 52 ± 23 mg/dL for the nondiabetics. During the discontinuation phase, the mean plasma glucose decreased 40 ± 20 mg/dL; two patients with high concentrations of regular insulin (50 and 100 units) showed an increase in plasma glucose when the TPN was stopped. Plasma glucose returned to the preinfusion baseline after discontinuation. During both initiation and discontinuation, plasma glucose showed little change after the first 60 minutes. No clinical symptoms of hypoglycemia were observed. In conclusion, TPN as a 3:1 admixture can be safely started as full nutrition support and stopped abruptly without a tapering schedule. Plasma glucose response is rapid, predictable, and mostly complete within 60 minutes. (Journal of Parenteral and Enteral Nutrition 17:64-67, 1993)

Journal of Parenteral and Enteral Nutrition, Vol. 17, No. 1, 64-67 (1993)
DOI: 10.1177/014860719301700164


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