Alkalosis Treatment – Causes, Symptoms and Therapy
Alkalosis treatment includes measures to correct an elevated blood pH and restore the normal acid-base balance. The approach depends on the underlying cause.
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Alkalosis treatment includes measures to correct an elevated blood pH and restore the normal acid-base balance. The approach depends on the underlying cause.
What Is Alkalosis?
Alkalosis is a disturbance of the acid-base balance in which the pH of the blood rises above the normal range of 7.35 to 7.45. The body depends on a precisely regulated balance between acids and bases to maintain vital functions. When the pH rises too high, the normal functioning of organs, nerves, and muscles can be severely impaired.
Types of Alkalosis
There are two main forms of alkalosis:
- Metabolic alkalosis: Caused by an excess of bicarbonate (HCO₃⁻) or a loss of acids in the body, for example due to severe vomiting, the use of diuretics, or potassium deficiency.
- Respiratory alkalosis: Caused by excessive elimination of carbon dioxide (CO₂) through the lungs, commonly seen in hyperventilation, fever, high-altitude exposure, or mechanical ventilation.
Causes of Alkalosis
The causes of alkalosis vary depending on the type:
- Frequent vomiting or gastric drainage (leading to loss of hydrochloric acid)
- Use of diuretics (medications that increase urine output)
- Potassium deficiency (hypokalemia)
- Overdose of sodium bicarbonate
- Hyperventilation due to anxiety, pain, or lung conditions
- Mechanical ventilation set at too high a respiratory rate
Symptoms of Alkalosis
Symptoms can vary depending on severity and include:
- Tingling or numbness in the hands, feet, or around the mouth
- Muscle cramps or spasms (tetany)
- Dizziness and lightheadedness
- Nausea and vomiting
- Cardiac arrhythmias (in severe cases)
- Confusion or altered consciousness
Diagnosis
Alkalosis is diagnosed using an arterial blood gas (ABG) analysis, which measures blood pH, carbon dioxide partial pressure (pCO₂), bicarbonate levels, and other parameters. Blood and urine electrolytes -- especially potassium, chloride, and sodium -- are also measured to identify the underlying cause.
Treatment of Alkalosis
Treatment is directed at the underlying cause and the specific type of alkalosis. The primary goal is always to eliminate the triggering factor and restore a normal blood pH.
Treatment of Metabolic Alkalosis
- Fluid and electrolyte replacement: Infusion of normal saline (NaCl) to restore chloride levels; correction of potassium deficiency through potassium supplementation.
- Discontinuation of causative medications: Reducing or stopping diuretics if they are the cause of alkalosis.
- Treatment of the underlying condition: Addressing primary hyperaldosteronism, Cushing syndrome, or other hormonal disorders.
- Hydrochloric acid infusion: In very severe cases, diluted hydrochloric acid (HCl) may be administered intravenously, but only under intensive care monitoring.
- Acetazolamide: This medication inhibits carbonic anhydrase and promotes the renal excretion of bicarbonate.
Treatment of Respiratory Alkalosis
- Treating the underlying cause: Managing fever, pain, or underlying pulmonary conditions.
- Breathing regulation: In cases of anxiety- or panic-induced hyperventilation, controlled breathing techniques can help normalize CO₂ levels in the blood.
- Adjustment of ventilator settings: In mechanically ventilated patients, the respiratory rate or tidal volume is reduced.
- Rebreathing: Rebreathing into a paper bag (previously practiced) is no longer recommended due to associated risks.
Prognosis
With timely diagnosis and consistent treatment of the cause, the prognosis for alkalosis is generally good. However, severe or untreated alkalosis can lead to serious cardiac arrhythmias, seizures, or loss of consciousness and constitutes a medical emergency.
References
- Kellum, J. A. - Disorders of Acid-Base Balance. In: Critical Care Medicine (2015), Elsevier.
- Gennari, F. J. - Metabolic Alkalosis. In: New England Journal of Medicine, 2002; 346:1876-1883.
- World Health Organization (WHO) - Guidelines on the Management of Electrolyte Disorders. WHO Press, Geneva.
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