USMLE/COMLEX - Step 2 - Hyperosmolar Hyperglycemic State
Pathophysiology
Hyperosmolar Hyperglycemic State is caused by insulin deficiency leading to hyperglycemia, osmotic diuresis, dehydration, electrolyte imbalances, and hyperosmolarity. It can cause damage to blood vessels and organs, particularly the brain. The loss of electrolytes can also lead to significant disturbances in the body's electrolyte balance.
Symptoms
Extreme thirst
Dry mouth
Increased urination
High blood sugar levels
Weakness or fatigue
Blurred vision
Confusion or disorientation
Seizures or convulsions
Loss of consciousness
Findings
Profound dehydration
Neurological symptoms, such as confusion, lethargy, or coma
Focal or generalized seizures
Hypotension
Signs of electrolyte imbalances, such as hypernatremia or hyperkalemia
Diagnosis
Blood glucose levels
Arterial blood gas
Serum electrolyte levels
Serum osmolality
Complete blood count
Renal function tests
Urinalysis
Treatment
The management of Hyperosmolar Hyperglycemic State (HHS) typically involves the following steps:
1. Fluid resuscitation: The priority in HHS treatment is to correct dehydration and electrolyte imbalances by administering intravenous fluids. Normal saline is typically the initial fluid of choice, followed by half-normal saline if serum sodium levels are high. The goal is to restore intravascular volume and renal perfusion.
2. Insulin therapy: Insulin therapy is necessary to lower blood glucose levels and to shift glucose from the extracellular space into the intracellular space. Continuous intravenous insulin infusion is the preferred method of insulin administration.
3. Electrolyte replacement: Electrolyte imbalances are common in HHS and can be severe. Electrolyte replacement therapy, including potassium and magnesium, may be necessary.
4. Correction of underlying conditions: Treat any underlying conditions that may have contributed to the development of HHS, such as infection or renal failure.
5. Close monitoring: Patients with HHS require close monitoring of vital signs, fluid and electrolyte balance, and blood glucose levels.
6. Prevention of complications: Complications associated with HHS, such as cerebral edema, deep vein thrombosis, and infections, should be prevented or treated promptly.