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Diabetic ketoacidosis

Diabetic ketoacidosis is a serious complication of diabetes that occurs when your body produces high levels of blood acids called ketones.

Diabetic ketoacidosis develops when your body is unable to produce enough insulin. Insulin normally plays a key role in helping sugar (glucose) — a major source of energy for your muscles and other tissues — enter your cells. Without enough insulin, your body begins to break down fat as an alternate fuel. This process produces a buildup of toxic acids in the bloodstream called ketones, eventually leading to diabetic ketoacidosis if untreated.

If you have diabetes or you're at risk of diabetes, learn the warning signs of diabetic ketoacidosis — and know when to seek emergency care.

Symptoms Causes Risk factors Complications Prevention

Diabetic ketoacidosis signs and symptoms often develop quickly, sometimes within 24 hours. For some, these signs and symptoms may be the first indication of having diabetes. You may notice:

  • Excessive thirst
  • Frequent urination
  • Nausea and vomiting
  • Abdominal pain
  • Weakness or fatigue
  • Shortness of breath
  • Fruity-scented breath
  • Confusion

More-specific signs of diabetic ketoacidosis — which can be detected through home blood and urine testing kits — include:

  • High blood sugar level (hyperglycemia)
  • High ketone levels in your urine

When to see a doctor

If you feel ill or stressed, or you've had a recent illness or injury, check your blood sugar level often. You might also try an over-the-counter urine ketones testing kit.

Contact your doctor immediately if:

  • You're vomiting and unable to tolerate any food or liquid
  • Your blood sugar level is higher than your target range and doesn't respond to home treatment
  • Your urine ketone level is moderate or high

Seek emergency care if:

  • Your blood sugar level is consistently higher than 300 milligrams per deciliter (mg/dL), or 16.7 millimoles per liter (mmol/L)
  • You have ketones in your urine and can't reach your doctor for advice
  • You have multiple signs and symptoms of diabetic ketoacidosis — excessive thirst or frequent urination, nausea and vomiting, abdominal pain, shortness of breath, fruity-scented breath, confusion

Remember, untreated diabetic ketoacidosis can be fatal.

Sugar is a main source of energy for the cells that make up your muscles and other tissues. Normally, sugar enters your cells with the help of insulin. If you don't have enough insulin in your body, your body won't be able to use sugar properly for energy. This prompts the release of hormones that break down fat as an alternate fuel. In turn, this process produces toxic acids known as ketones. Excess ketones accumulate in the blood and eventually "spill over" into the urine.

Diabetic ketoacidosis is usually triggered by:

  • An illness. An infection or other illness can cause your body to produce higher levels of certain hormones, such as adrenaline or cortisol. Unfortunately, these hormones work against insulin — sometimes triggering an episode of diabetic ketoacidosis. Pneumonia and urinary tract infections are common culprits.
  • A problem with insulin therapy. Missed insulin treatments or inadequate insulin therapy can leave you with too little insulin in your system, triggering an episode of diabetic ketoacidosis.

Other possible triggers of diabetic ketoacidosis may include:

  • Stress
  • Physical or emotional trauma
  • High fever
  • Surgery
  • Heart attack
  • Alcohol or drug abuse, particularly cocaine

The risk of diabetic ketoacidosis is highest if you:

  • Have type 1 diabetes
  • Are younger than age 19
  • Frequently miss insulin doses

However, diabetic ketoacidosis can also occur if you have type 2 diabetes, although this is uncommon. In some cases, diabetic ketoacidosis may be the first sign that a person has diabetes.

Diabetic ketoacidosis is treated with fluids, electrolytes — such as sodium, potassium and chloride — and insulin. Perhaps surprisingly, the most common complications of diabetic ketoacidosis are related to this lifesaving treatment.

Possible complications of the treatments

Treatment complications include:

  • Low blood sugar (hypoglycemia). Insulin allows sugar to enter your cells. This causes your blood sugar level to drop. If your blood sugar level drops too quickly, you may develop low blood sugar.
  • Low potassium (hypokalemia). The fluids and insulin used to treat diabetic ketoacidosis may cause your potassium level to drop too low. A low potassium level can impair the activities of your heart, muscles and nerves.
  • Swelling in the brain (cerebral edema). Adjusting your blood sugar level too quickly can produce swelling in your brain. This complication appears to be more common in children, especially those with newly diagnosed diabetes.

Left untreated, the risks are much greater. Diabetic ketoacidosis can lead to loss of consciousness. Eventually, diabetic ketoacidosis can be fatal.

There's much you can do to prevent diabetic ketoacidosis and other diabetes complications.

  • Make a commitment to managing your diabetes. Make healthy eating and physical activity part of your daily routine. Take oral diabetes medications or insulin as directed.
  • Monitor your blood sugar level. You may need to check and record your blood sugar level at least three to four times a day — or more if you're ill or under stress. Careful monitoring is the only way to make sure that your blood sugar level remains within your target range.
  • Adjust your insulin dosage as needed. Talk to your doctor or diabetes educator about how to adjust your insulin dosage depending on your blood sugar level, what you eat, how active you are, whether you're ill and other factors. If your blood sugar level begins to rise, follow your diabetes treatment plan to return your blood sugar level to your target range.
  • Check your ketone level. When you're ill or under stress, test your urine for excess ketones with an over-the-counter urine ketones test kit. If your ketone level is moderate or high, contact your doctor right away or seek emergency care.
  • Be prepared to act quickly. If you suspect that you have diabetic ketoacidosis — your blood sugar level is high and you have excess ketones in your urine — seek emergency care.

Diabetes complications are scary. But don't let fear keep you from taking good care of yourself. Follow your diabetes treatment plan carefully, and ask your diabetes treatment team for help when you need it.

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