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This idealized diagram shows the fluctuation of blood sugar (red) and the sugar-lowering hormone insulin (blue) in humans during the course of a day containing three meals. Hyperglycemia, or high blood sugar, is a condition of abnormally high levels of glucose in the blood. Hyperglycemia represents a breakdown in the normal system that maintains glucose levels within an acceptable range. Blood glucose levels need to be maintained within a narrow range, despite the impact of consuming substantial carbohydrates or considerable intervals between meals. Various conditions can affect the level of blood glucose levels above or below the normal range.
Hyperglycemia results when there is an abundance of glucose in the bloodstream, such as when the glucose in the blood cannot enter cells.
Glucose levels vary before and after meals, and at various times of day; the definition of "normal" varies among medical professionals. Chronic hyperglycemia that persists even in fasting states is most commonly caused by diabetes mellitus, and in fact chronic hyperglycemia is the defining characteristic of the disease.
Certain eating disorders can produce acute non-diabetic hyperglycemia, as in the binge phase of bulimia nervosa, when the subject consumes a large amount of calories at once, frequently from foods that are high in simple and complex carbohydrates. A high proportion of patients suffering an acute stress such as stroke or myocardial infarction may develop hyperglycemia, even in the absence of a diagnosis of diabetes. A transient hyperglycemic episode also can be triggered by a stress that overtaxes a person’s mental resources (Culvert 2005). Frequent hunger without other symptoms can also indicate that blood sugar levels are too low. Polydipsia and polyuria occur when blood glucose levels rise high enough to result in excretion of excess glucose via the kidneys (glycosuria), producing osmotic diuresis. Treatment of hyperglycemia requires elimination of the underlying cause, such as treatment of diabetes when diabetes is the cause or removal of stressors.
The prognosis for individuals with mild to moderate hyperglycemia is good, based on treatment.


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Such excessive concentrations of blood sugar circulating in blood plasma most commonly results from type 1 or type 2 diabetes mellitus, but also can occur from other circumstances, such as illness or infection.
It is a treatable condition, but if not addressed it can develop into one of two life-threatening complications: diabetic ketoacidosis (DKA) or hyperglycemic hyperosmolar nonketotic syndrome (HHNS). Normally, these blood glucose levels are maintained by two complementary groups of metabolic hormones. One of the most well-known of these is diabetes mellitus, a condition where there is abnormally high blood glucose levels. The hyperosmolar, glucose-rich blood draws fluid from the intracellular and interstitial spaces and causes thirst and dehydration (Fain 2001). Acute episodes of hyperglycemia without an obvious cause may indicate developing diabetes or a predisposition to the disorder. Certain medications also increase the risk of hyperglycemia, including beta blockers, thiazide diuretics, corticosteroids, niacin, pentamidine, protease inhibitors, L-asparaginase (Detin et al.
Human and animal studies suggest that this is not benign, and that stress-induced hyperglycemia is associated with a high risk of mortality after both stroke and myocardial infarction (Capes et al. When the body is stressed, endogenous catecholamines are released that, among other things, serve to raise the blood glucose levels. This may occur when people who have diabetes take too much oral hypoglycemic medication or insulin for the amount of food they eat. Acute and severe hyperglycemia can be treated by direct administration of insulin in most cases, under medical supervision.
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Insulin, an anabolic polypeptide hormone synthesized in the pancreas, regulates carbohydrate metabolism such as to decrease blood glucose.
The two most common forms of diabetes are due to either a diminished production of insulin (in type 1), or diminished response by the body to insulin (in type 2 and gestational). Chronic hyperglycemia can result when diabetes is untreated or poorly controlled, while acute hyperglycemia can result when there is an underlying condition that interferes with glucose control, such as an illness or infection, as well as those with type 2 diabetes that are under extreme stress (Fain 2001). The amount of increase varies from person to person and from inflammatory response to response. The resulting drop in blood sugar level to below the normal range prompts a hunger response.


Treatment of hyperglycemia should be done with close monitoring and delivered carefully in order to avoid the risk of hypokalemia (higher than normal blood serum levels of potassium) and subsequent edema (Culvert 2005).
Credit is due under the terms of this license that can reference both the New World Encyclopedia contributors and the selfless volunteer contributors of the Wikimedia Foundation. The catabolic hormones (such as glucagon, growth hormone, and catecholamines) increase blood glucose. Both lead to hyperglycemia, which largely causes the acute signs of diabetes: excessive urine production, resulting compensatory thirst and increased fluid intake, blurred vision, unexplained weight loss, lethargy, and changes in energy metabolism. These low insulin levels inhibit the transport of glucose across cell membranes therefore causing high blood glucose levels.
As such, no patient with first-time hyperglycemia should be diagnosed immediately with diabetes if that patient is concomitantly sick.
This hunger is not usually as pronounced as in Type I diabetes, especially the juvenile onset form, but it makes the prescription of oral hypoglycemic medication difficult to manage. Patients with type 1 diabetes mellitus depend on external insulin for their survival because of an absolute deficiency of the hormone. Sustained higher levels of blood sugar cause damage to the blood vessels and to the organs they supply, leading to the complications of diabetes. Further testing, such as a fasting plasma glucose, random plasma glucose, or two-hour postprandial plasma glucose level, must be performed. Hyperglycemia, ketoacidosis and other complications of L-asparaginase in children with acute lymphoblastic leukemia. Mood and cognitive functions during acute euglycaemia and mild hyperglycaemia in type 2 diabetic patients Exp.
Patients with type 2 diabetes mellitus have insulin resistance or relatively low insulin production, or both; some type 2 diabetics eventually require insulin when other medications become insufficient in controlling blood glucose levels. Evidence for reduced availability of nitric oxide during hyperglycemia Circulation 95(7): 1783–90. Acute hyperglycemia alters mood state and impairs cognitive performance in people with type 2 diabetes Diabetes Care 27(10): 2335–40.
Acute effects on insulin sensitivity and diurnal metabolic profiles of a high-sucrose compared with a high-starch diet Am J Clin Nutr.



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