Natriumwaterstofcarbonaat Fresenius Kabi Nederland (Sodium Hydrogen Carbonate)

Sodium hydrogen carbonate is employed to treat acid‑base disorders, primarily metabolic acidosis, by providing exogenous bicarbonate.

• Metabolic acidosis: restores normal blood pH by increasing serum bicarbonate and neutralizing excess hydrogen ions.
• Renal tubular acidosis: corrects systemic acidemia when endogenous bicarbonate reabsorption is impaired.
• Diabetic ketoacidosis: supplies bicarbonate to support pH normalization in severe cases where acidosis persists despite insulin therapy.
• Lactic acidosis: provides bicarbonate to buffer hydrogen ions generated from lactate accumulation in septic or hypoxic conditions.
• Hyperchloremic acidosis: supplies bicarbonate to offset chloride‑induced reduction in plasma pH.

• Sodium hydrogen carbonate dissociates in plasma to yield sodium and bicarbonate ions. The bicarbonate acts as a physiological buffer, combining with hydrogen ions to form carbonic acid, which is rapidly converted to water and carbon dioxide for exhalation. This shift reduces the concentration of free hydrogen ions, raising blood pH toward normal. The administered sodium also contributes to extracellular fluid volume and electrolyte balance, supporting overall acid‑base homeostasis.

Sodium hydrogen carbonate may be associated with several adverse reactions, most of which are related to its electrolyte and alkalinizing properties.

Common Side Effects

• Hypernatremia: serum sodium may increase, causing thirst, hypertension, or mild neurologic signs.
• Fluid overload: excess volume can produce peripheral edema and increased cardiac workload.
• Metabolic alkalosis: over‑correction may raise blood pH beyond the normal range.
• Hypokalemia: potassium shift into cells may lead to muscle weakness or arrhythmias.
• Infusion site irritation: redness, pain, or swelling at the injection site.

Serious or Rare Side Effects

• Severe hypernatremia: marked sodium rise can cause confusion, seizures, or coma.
• Pulmonary edema: fluid in lungs may cause dyspnea and reduced oxygenation.
• Anaphylactic reaction: rare hypersensitivity with rash, bronchospasm, hypotension, and possible shock.
• Severe metabolic alkalosis: profound pH elevation may precipitate cardiac arrhythmias and neuromuscular irritability.

When using sodium hydrogen carbonate injection, several precautions should be observed to ensure safe and effective therapy.

• Monitor serum electrolytes: regularly check sodium, bicarbonate, and potassium levels during treatment.
• Assess acid‑base status: obtain baseline arterial blood gas before infusion and repeat as needed.
• Adjust infusion rate: avoid rapid administration that could over‑correct pH.
• Use caution in renal impairment: reduced excretion may increase risk of electrolyte imbalance.
• Contraindicated in severe metabolic alkalosis: do not administer when pH is already elevated.
• Store at 2-8°C: keep refrigerated, protect from light, do not freeze or shake.

Sodium hydrogen carbonate can interact with other medicines, influencing electrolyte balance or acid‑base status.

Major Interactions (Avoid)

• Sodium bicarbonate + calcium carbonate: risk of hypercalcemia and excessive alkalinity.
• Sodium bicarbonate + loop diuretics: may exacerbate electrolyte disturbances, especially hypokalemia.
• Sodium bicarbonate + ACE inhibitors or ARBs: increased chance of metabolic alkalosis.

Moderate Interactions (Monitor Closely)

• Sodium bicarbonate + potassium‑sparing diuretics: monitor potassium to prevent hyperkalemia.
• Sodium bicarbonate + antacids: cumulative alkali load may require dose adjustment.
• Sodium bicarbonate + insulin therapy: insulin‑induced potassium shift can be amplified.