Understanding and Managing Diabetes and Blood Glucose Levels

Understanding Glucose Extremes

Blood glucose levels are generally categorized into two dangerous states: hypoglycemia and hyperglycemia.

Hypoglycemia (Low Blood Sugar)

Hypoglycemia occurs when blood sugar is reduced, causing the brain and body cells to starve. This condition often has a rapid onset and can lead to altered mental status, seizures, or unconsciousness.

• Symptomatic Threshold: A level less than $60\text{ mg/dL}$ in a symptomatic patient indicates hypoglycemia.
• Severe Hypoglycemia: Levels below $50\text{ mg/dL}$ can cause significant alterations in mental status or unconsciousness.
• Meter Alert: If a meter displays LOW, the glucose level is below $15\text{ mg/dL}$.

Hyperglycemia (High Blood Sugar)

Hyperglycemia is characterized by high blood sugar, often developing more slowly over days or weeks. It is frequently caused by insulin deficiency, infection, or stress.

• Threshold: Levels greater than $140\text{ mg/dL}$ indicate hyperglycemia.
• Severe Hyperglycemia: Prolonged levels above $300\text{ mg/dL}$ can lead to dehydration and more serious symptoms.
• Meter Alert: If a meter displays HIGH, the glucose level exceeds $500\text{ mg/dL}$.

Managing Altered Mental Status

A primary sign of a diabetic emergency is altered mental status. Because the Reticular Activating System (RAS) requires glucose to function, a lack of sugar can cause a patient to appear intoxicated, agitated, or even combatant.

Oral Glucose Administration

In the field, if a patient is experiencing mild hypoglycemia and exhibits altered mental status, oral glucose may be administered. However, this is only appropriate if the patient meets three specific criteria:

1. A known history of diabetes.
2. Presenting with altered mental status.
3. The ability to swallow and protect their airway.

If the patient is awake enough to swallow, they can squeeze the glucose directly from the tube into their mouth.

Airway Protection and Aspiration Prevention

The most critical decision point in administering oral glucose is ensuring the patient can prevent aspiration (inhaling the substance into the lungs).

If a patient is unable to swallow or has an unprotected airway, you must treat them as a high-priority airway emergency:

• Secure the airway.
• Provide artificial ventilations (if breathing is inadequate).
• Place the patient in the recovery position if ventilations are not required.

Exam Tip: It is not strictly necessary to distinguish between hypoglycemia and hyperglycemia to provide field treatment. Oral glucose is recommended for any suspected diabetic emergency because while it helps the hypoglycemic patient, it will not harm a hyperglycemic patient. Always reassess the patient after administration and consult medical direction if no improvement occurs.