portaladmin posted on October 05, 2009 11:12
by Gerald G. Briggs, BPharm, FCCP
Diabetes mellitus can be classified into three types:
type 1: autoimmune disease that results in β-cell destruction, usually leading to absolute insulin deficiency; ketoacidosis prone; may have a late onset and slow progression of disease; pregestational diabetes
type 2: non-autoimmune disease that results in progressive insulin secretory defect on the background of insulin resistance; ketoacidosis resistant; pregestational diabetes
type 3: diabetes diagnosed during pregnancy, called gestational diabetes.
Diabetes mellitus is the most common medical complication of pregnancy, occurring in 2%-3% of all pregnancies. Approximately 90% of these represent gestational diabetes mellitus (GDM; type 3) where the onset or recognition of glucose intolerance occurs during pregnancy. Most of these cases represent true GDM in which glucose intolerance disappears after delivery, but a significant number are newly diagnosed type 2 diabetics. The distinction is important because poorly controlled pregestational diabetes can cause all aspects of developmental toxicity (growth alteration, structural anomalies, functional/neurobehavioral defects, and death), whereas true GDM does not cause structural anomalies because its onset is after organogenesis. Suboptimal treatment of this disease, indicated by a hemoglobulin A1c (HbA1c) above (>6%) the normal, is associated with significant maternal, embryo, fetal, neonatal, childhood and adolescent morbidity and mortality. Thus, tight control of the blood glucose level in pregnant diabetic patients is a primary therapeutic goal.
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