Abstract:
:A major problem in replacing insulin in type I diabetes mellitus is that currently no depot preparation exists that is capable of mimicking the background insulin secretion of the healthy pancreas. Because all of the currently available intermediate- or long-acting insulin preparations have a peaked-action profile, excess insulin action at midnight and insulin waning at dawn occur whenever such an insulin preparation is given at supper time. If the target fasting plasma glucose is the ambitious near-normoglycemia of intensive insulin therapy, intermediate-acting insulin at suppertime easily results in hypoglycemia in the early evening hours and hyperglycemia in the fasting state. The problems of overnight glycemia in type I diabetes are further complicated by the dawn phenomenon and the Somogyi phenomenon. The dawn phenomenon is the combination of an initial decrease in insulin requirements between approximately 2400 and approximately 0300, followed by an increase in the insulin needs between approximately 0500 and approximately 0800. The dawn phenomenon is the result of changes in hepatic (and extrahepatic) insulin sensitivity, which are best attributed to nocturnal growth hormone secretion. The dawn phenomenon is a day-to-day reproducible event that occurs in nearly all diabetic patients. Its contribution to fasting hyperglycemia correlates with diabetes duration (inversely) and the HbA1c percentage (directly). Overall, it is estimated that the specific contribution of the dawn phenomenon to fasting hyperglycemia is approximately 2 mM (approximately 35 mg/dl), but it may be much greater because of the warning of the depot-insulin preparation injected the previous evening. The Somogyi phenomenon, strictly speaking, refers to fasting hyperglycemia that occurs after inducement of nocturnal hypoglycemia by regular insulin. Because the present therapeutic regimens of NPH/Lente insulin given at suppertime cause overnight hyperinsulinemia, excessive fasting hyperglycemia rarely follows nocturnal hypoglycemia, except when excessive glucose is ingested to correct hypoglycemia. However, nocturnal hypoglycemia may easily deteriorate glycemic control later in the day, because it induces prolonged posthypoglycemic insulin resistance, which results in postbreakfast and late-morning hyperglycemia. With nocturnal insulin therapy, it is important to consider the problems of insulin pharmacokinetics, the dawn phenomenon, and the Somogyi phenomenon to prevent both nocturnal hypoglycemia and excessive fasting hyperglycemia.(ABSTRACT TRUNCATED AT 400 WORDS)
journal_name
Diabetes Carejournal_title
Diabetes careauthors
Bolli GB,Perriello G,Fanelli CG,De Feo Pdoi
10.2337/diacare.16.3.71subject
Has Abstractpub_date
1993-12-01 00:00:00pages
71-89eissn
0149-5992issn
1935-5548journal_volume
16 Suppl 3pub_type
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