What is acidosis, and why is it a medical emergency?
Acidosis is a medical condition characterized by a blood pH below 7.35—outside the normal physiological range (7.35–7.45). Not to be confused with dietaryacid-base balance (the PRAL concept), acidosis is a biological emergency. Arnaud, Ph.D. in Pharmacy, emphasizes: any suspected case of acidosis requires immediate hospital care. Our calcium and magnesium product line supports mineral balance to help prevent mild acidosis.
- Metabolic acidosis (serum bicarbonate < 22 mmol/L): accumulation of nonvolatile acids or loss of bicarbonate—main causes: diabetic ketoacidosis (DKA), chronic kidney disease, salicylate poisoning, lactic acidosis (circulatory shock), severe chronic diarrhea
- Respiratory acidosis (PaCO₂ > 45 mmHg): alveolar hypoventilation → accumulation of CO₂ → carbonic acid → acidification — causes: exacerbated COPD, severe pneumonia, severe acute asthma, central hypoventilation (stroke, depressant medications)
- Anion gap (Normal Anion Gap / High Anion Gap): key diagnostic tool — high anion gap (> 12 mEq/L): ketoacidosis, lactate, renal failure, poisonings (methanol, ethylene glycol) — normal anion gap: gastrointestinal losses (diarrhea), renal tubular loss
- Mixed acidosis: combination of metabolic and respiratory acidosis — most severe clinical presentation — common in intensive care (sepsis + pulmonary failure)
- Laboratory warning signs: pH < 7.20 → myocardial dysfunction + vasodilation + risk of cardiac arrest — pH < 7.00 → life-threatening condition → emergency hospitalization
Clinical symptoms and diagnosis of acidosis
- Clinical signs of metabolic acidosis: Kussmaul breathing (compensatory, deep, and rapid hyperventilation) — extreme fatigue — nausea and vomiting — mental confusion — abdominal pain (diabetic ketoacidosis)
- Clinical signs of respiratory acidosis: dyspnea + cyanosis + tachycardia — progressive drowsiness (hypercapnia = sedation) — headache + asterixis — in severe cases: hypercapnic coma
- Arterial blood gas (ABG) analysis: key test — pH + PaCO₂ + HCO₃⁻ + PaO₂ + SaO₂ — 4-step interpretation: pH (acidosis?), primary component (HCO3- or CO2?), compensation (adequate?), anion gap
- Additional laboratory tests: serum electrolyte panel (Na+, K+, Cl-) — blood glucose + ketone bodies (DKA) — lactate — creatinine + urea (renal failure) — salicylate levels if poisoning is suspected
- Absolute red flags (call 15): confusion + rapid hyperventilation + abdominal pain + polyuria/polydipsia in a diabetic patient — suspected diabetic ketoacidosis → life-threatening emergency
Medical treatments for acidosis based on the cause
- Diabetic ketoacidosis (DKA): IV insulin therapy + rehydration + electrolyte correction (closely monitor K+) — IV bicarbonate only if pH < 7.00 (risk of rebound alkalosis) — hospitalization in the ICU
- Lactic acidosis: treatment of the underlying cause (septic shock, heart failure) — oxygenation and fluid resuscitation — mechanical ventilation if associated respiratory failure
- Chronic renal acidosis: oral sodium bicarbonate 1–3 g/day — maintain HCO₃⁻ > 22 mmol/L — slows the progression of renal failure — bone protection (chronic acidosis mobilizes bone calcium)
- Chronic respiratory acidosis (COPD): bronchodilators + corticosteroids + long-term oxygen therapy (LTOT) — nocturnal NIV (noninvasive ventilation) if chronic hypercapnia
- Poisonings (methanol, ethylene glycol): fomepizole (antidote) + emergency hemodialysis — supplemental antidote: IV ethanol (enzymatic competition) — toxicology emergency
Prevention, natural support, and monitoring of chronic acidosis
- Well-controlled diabetes: HbA1c < 7% — strict self-monitoring of blood glucose — avoid prolonged fasting in people with type 1 diabetes (rapid ketogenesis) — be aware of the warning signs of DKA
- Magnesium: cofactor of intracellular buffer systems — common deficiency in chronic kidney disease and with prolonged PPI use — 300–400 mg/day of bisglycinate to prevent hypomagnesemia
- Vitamin D3: chronic renal acidosis → compensatory mobilization of bone calcium → osteomalacia — supplementation with 1,000–2,000 IU/day with monitoring of serum calcium levels
- Alkalizing diet to prevent latent acidosis: vegetables and fruits rich in potassium and magnesium (negative PRAL) — reduction of excess animal protein — see our acid-base balance page for detailed nutritional strategies
- Biochemical monitoring every six months for at-risk patients (kidney failure, diabetes, COPD): blood gas analysis + ionogram + creatinine + bicarbonate levels — treatment adjustment by a specialist physician
