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Diabetes - type 2

Description

An in-depth report on the causes, diagnosis, treatment, and prevention of type 2 diabetes.

Alternative Names

Type 2 diabetes; Maturity onset diabetes; Noninsulin-dependent diabetes

Emergency Complications

Hypoglycemia

People with diabetes who need to intensively control glucose levels are at risk for low blood sugar (hypoglycemia). Hypoglycemia, also called insulin shock, develops if blood sugar levels fall below normal. It may also be caused by insufficient intake of food, excess exercise, or alcohol intake. The condition is usually manageable, but occasionally it can be severe or even life threatening, particularly if the patient fails to recognize the symptoms. Mild hypoglycemia is common among people with type 2 diabetes, but severe episodes are rare, even among those who are taking insulin. Still, all patients who intensively control blood sugar (glucose) levels should be aware of warning symptoms.

Risk Factors for Severe Hypoglycemia. People at highest risk for severe hypoglycemia are those who intensively control blood glucose and also have one or more of the following conditions:

• Long-term diabetes
• Less education on their condition
• A previous history of severe hypoglycemia
• Hypoglycemia unawareness

Hypoglycemia unawareness is a condition in which people become insensitive to hypoglycemic symptoms. It affects about 25% of patients who use insulin, nearly always people with type 1 diabetes. In such cases, hypoglycemia appears suddenly, without warning, and can escalate to a severe level. Even a single recent episode of hypoglycemia may make it more difficult to detect the next episode. With vigilant monitoring and by rigorously avoiding low blood glucose levels, patients can often regain the ability to sense the symptoms. However, even very careful testing may fail to detect a problem, particularly one that occurs during sleep.

Symptoms. Mild hypoglycemia symptoms usually occur at moderately low and easily correctable levels of blood glucose. They include:

• Sweating
• Trembling
• Hunger
• Rapid heartbeat

Severely low blood glucose levels can cause neurologic symptoms such as:

• Confusion
• Weakness
• Disorientation
• Combativeness
• In rare and worst cases, coma, seizure, and death

Preventive Measures. The following tips may help avoid hypoglycemia or prepare for attacks:

• Patients are at highest risk for hypoglycemia at night. Bedtime snacks may be helpful.
• Patients who intensively control their blood sugar should monitor blood levels as often as possible, four times or more per day. This is particularly important for patients with hypoglycemia unawareness.
• In adults, it is also particularly critical to monitor blood glucose levels before driving, when hypoglycemia can be very hazardous.
• Patients who use medications that put them at risk for hypoglycemia should always carry hard candy, juice, sugar packets, or commercially available glucose substitutes designed for individuals with diabetes.

Family and friends should be aware of the symptoms and be prepared:

• If the patient is helpless (but not unconscious), family or friends should administer three to five pieces of hard candy, two to three packets of sugar, half a cup (four ounces) of fruit juice, or a commercially available glucose solution.
• If there is inadequate response within 15 minutes, additional oral sugar should be provided or the patient should receive emergency medical treatment, including intravenous administration of glucose.
• Family members and friends can learn to inject glucagon, a hormone, which, in contrast to insulin, raises blood glucose.

Diabetic Ketoacidosis (DKA)

Diabetic ketoacidosis (DKA) is a life-threatening complication caused by insulin depletion. Until recently, it was a complication almost exclusively of type 1 diabetes. In such cases, it is nearly always due to noncompliance with insulin treatments. However, DKA is being reported increasingly in type 2 diabetes, especially among Hispanic and African Americans. It is not clear what causes total insulin depletion in these patients. Researchers are trying to learn which individuals are at particular risk.

Diabetic ketoacidosis often develop as follows:

• The process is usually triggered in insulin-deficient patients by a stressful event, most often pneumonia or urinary tract infections. Other triggers include alcohol abuse, physical injury, pulmonary embolism, heart attacks, or other illnesses.
• Severely low insulin levels cause excessive amounts of glucose in the bloodstream (hyperglycemia).
• Fat breakdown then accelerates and increases the production of fatty acids.
• These fatty acids are converted into chemicals called ketone bodies, which are toxic at high levels.

Symptoms and complications may include:

• Nausea and vomiting
• Abnormally deep and rapid breathing with frequent sighing
• Rapid heartbeat
• If the condition persists, coma and, eventually, death, may occur; however, over the past 20 years, death from DKA has decreased to about 2% of all cases
• Other serious complications from DKA include aspiration pneumonia and adult respiratory distress syndrome

Life-saving treatment uses rapid rehydration with a saline solution followed by low-dose insulin and potassium replacement.

• Review Date: 7/15/2006
• Reviewed By: Harvey Simon, M.D., Editor-in-Chief, Associate Professor of Medicine, Harvard Medical School; Physician, Massachusetts General Hospital

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