Hypernatremia

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Hypernatremia
Hypernatremia: High sodium concentration in blood
Definition: Serum sodium above 145 mmol/L
Important electrolyte imbalance in clinical practice

Causes and Classifications

Low volume hypernatremia
Sweating
Vomiting
Diarrhea
Diuretic medication
Kidney disease

Normal volume hypernatremia
Fever
Extreme thirst
Prolonged increased breath rate
Diabetes insipidus
Lithium use

High volume hypernatremia
Hyperaldosteronism
Excessive IV normal saline or sodium bicarbonate
Rare: Excessive salt consumption

Symptoms

Early: Excessive thirst, weakness, nausea, loss of appetite
Advanced: Confusion, muscle twitching
Severe (above 160 mmol/L): Bleeding in or around the brain

Diagnosis
Serum sodium levels above 145 mmol/L
Detailed patient history
Physical examination (assess volume status)
Urine analysis (osmolality and sodium levels)

Treatment
Goal: Safely restore water balance
Methods:
Oral free water intake
IV fluids (e.g., dextrose solutions)
Avoid rapid correction to prevent complications

Correction rates
Acute (less than 48 hours): 1 mEq/L/h
Chronic: less than 0.5 mEq/L/h or 10-12 mEq/24 h

Special Considerations
Infants: Risk from improper formula mixing
Elderly: Increased susceptibility to dehydration
Patients with impaired mental status: Unable to communicate thirst

Complications
Cerebral edema (from rapid correction)
Central pontine myelinolysis
Seizures
Coma

Prevention
Encourage adequate fluid intake
Educate on proper infant formula preparation
Monitor high-risk patients:
Fluid intake and output
Regular serum sodium checks

Conclusion
Hypernatremia requires thorough understanding
Vigilance in identifying risk factors is crucial
Measured approach to treatment improves outcomes
Collaborative healthcare team approach is essential