How are glucose intolerance disorders treated?

Updated: Jul 08, 2020
  • Author: Samuel T Olatunbosun, MD, FACP, FACE; Chief Editor: George T Griffing, MD  more...
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Routine evaluation in an ambulatory setting is feasible for most patients. Patients with acute decompensation due to glucose intolerance or any related disorders may require inpatient care. A major goal in the management of glucose intolerance is glycemic control.

Of note is the novel treatment with DPP-4–resistant GLP-1 receptor agonists, such as exenatide and liraglutide, which are incretin mimetics, as well as with the DPP-4 inhibitors sitagliptin and vildagliptin. [48, 49, 50] Exenatide may be effective in preventing steroid-induced glucose intolerance through suppression. [51]

Both strategies have been successful in clinical studies. Liraglutide was approved by the FDA in January 2010 for monotherapy, as a second-line treatment and in combination with oral agents. The mechanisms of action of incretin mimetics include stimulation of insulin secretion in response to nutrient intake, inhibition of glucagon secretion, delay of gastric emptying, and induction of early satiety. Other benefits include preservation of beta cell mass and improvement of secretory function. The advantages of the DPP-IV inhibitors include oral availability, good tolerability, and weight neutrality.

Amylin has several glucoregulatory effects that complement those of insulin in postprandial glucose regulation; thus, mealtime amylin administration may be adjunctive to mealtime insulin replacement and may facilitate improvement of postprandial and overall glycemic control in patients with type 1 or type 2 diabetes. Naturally occurring human amylin is unsuitable for clinical use because of several physicochemical properties, however; pramlintide acetate contains an amylin analogue without those limitations. [52, 53, 54, 55, 56]

All patients with type 1 diabetes are insulin-dependent. Treatment of severe hyperglycemia during acute decompensation in a patient with type 2 diabetes may reverse the state of glucose toxicity, further improving secretory function of beta cells in the pancreas. Type 2 diabetes can be treated effectively with oral hypoglycemic drugs, with or without the addition of insulin. The natural history of type 2 diabetes is that of progressive beta-cell deterioration, secondary failure of oral agents, and the subsequent need for insulin therapy.

Gestational diabetes mellitus is treated with insulin and/or with lifestyle change. Oral agents are contraindicated in pregnancy.

With regard to the management of impaired glucose tolerance, the current approach is aggressive lifestyle modification. The results of the Diabetes Prevention Program showed that metformin therapy and intensive lifestyle intervention reduced the risk of developing type 1 and type 2 diabetes by 31% and 58%, respectively, compared with placebo in individuals with impaired glucose tolerance. [57] The Study to Prevent Non-Insulin–Dependent Diabetes Mellitus Trial demonstrated a 25% relative risk reduction in the development of diabetes, and an associated reduction in hypertension (34%) and cardiovascular events (49%). [58]

Orlistat may be beneficial in the context of obesity. [59]

Medical nutritional therapy should be guided by the American Dietetic Association recommendations and individualized by weight and height, level of physical activity, and requirements for calories and nutrients. [60]  A high level of physical activity is desirable, as appropriate to the patient's ability and general health. Most patients benefit from carefully planned exercise programs tailored to individual needs. [61]

Long-term monitoring of affected patients includes ensuring medication compliance, identifying adverse effects, blood glucose and HbA1c monitoring, dietary consultations and measures, and exercise management.

For more information, see Diabetes Mellitus, Type 1 and Diabetes Mellitus, Type 2.

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