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Lactic Acidosis Prophylaxis – Prevention Explained

Lactic acidosis prophylaxis includes measures to prevent a dangerous build-up of lactic acid in the blood. It is especially important in high-risk patients taking certain medications or with underlying conditions.

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Things worth knowing about "Lactic acidosis prophylaxis"

Lactic acidosis prophylaxis includes measures to prevent a dangerous build-up of lactic acid in the blood. It is especially important in high-risk patients taking certain medications or with underlying conditions.

What is Lactic Acidosis Prophylaxis?

Lactic acidosis prophylaxis refers to all preventive measures aimed at avoiding lactic acidosis -- a condition in which lactate (lactic acid) accumulates in the blood, leading to a dangerous over-acidification of the body. The blood pH falls below 7.35 and lactate levels exceed 5 mmol/l. Without timely intervention, this condition can be life-threatening.

Causes and Risk Factors of Lactic Acidosis

Understanding the causes of lactic acidosis is essential for effective prevention:

Tissue hypoxia: Oxygen deficiency in tissues -- for example during shock, heart failure, or severe blood loss -- promotes anaerobic glycolysis and thus increases lactate production.
Medication side effects: Certain drugs, especially metformin (an antidiabetic agent), can trigger lactic acidosis in cases of overdose or in patients with kidney impairment.
Liver disease: Since lactate is primarily metabolized in the liver, severe liver failure can lead to elevated lactate levels.
Sepsis and systemic infections: In septic shock, lactate production rises sharply due to tissue hypoxia and mitochondrial dysfunction.
Inherited metabolic disorders: Rare enzyme defects can impair lactate metabolism.
Intensive exercise: High-intensity physical activity can cause a temporary rise in lactate, though this is rarely clinically significant in healthy individuals.

Measures for Lactic Acidosis Prophylaxis

Pharmacological Prophylaxis

For patients taking metformin, prophylaxis is particularly important. Protective measures include:

Regular monitoring of kidney function (creatinine, GFR), as metformin can accumulate when renal function is impaired.
Temporary discontinuation of metformin before planned surgeries, contrast media procedures, or other interventions that carry a risk of kidney damage.
Dose adjustment or switching to alternative antidiabetic agents in cases of renal insufficiency.

Clinical and Intensive Care Prophylaxis

In critically ill patients, prevention includes:

Optimizing tissue oxygenation: Ensuring adequate oxygen supply through ventilation, volume therapy, and circulatory stabilization.
Early shock management: Rapid stabilization of the circulation in hypovolemic, cardiogenic, or septic shock.
Regular lactate monitoring: Measurement of blood lactate as an early indicator of tissue hypoxia or impending lactic acidosis.
Treatment of the underlying condition: Addressing the root cause (e.g., antibiotic treatment for sepsis, improving cardiac output in heart failure).

Dietary and Lifestyle Measures

In patients with certain inherited metabolic disorders, specific dietary approaches (e.g., ketogenic diet) and avoidance of prolonged fasting may have a preventive effect.

Diagnosis and Monitoring

Early detection of impending lactic acidosis is critical. The following diagnostic methods are used:

Blood gas analysis (BGA): Measurement of pH, bicarbonate, and base excess.
Blood lactate measurement: A value above 2 mmol/l is considered elevated; above 5 mmol/l indicates lactic acidosis.
Renal function parameters: Creatinine, urea, and GFR to assess excretory capacity.
Liver function tests: Transaminases and bilirubin to evaluate lactate metabolism.

Treatment of Manifest Lactic Acidosis

If lactic acidosis occurs despite prophylactic measures, treatment includes:

Addressing the underlying cause (e.g., discontinuing metformin, treating shock).
Cautious buffering with sodium bicarbonate in cases of severe pH decline.
Hemodialysis for lactate removal and acid-base stabilization in life-threatening cases.
Supportive intensive care measures.

References

Orban J.C., Leverve X., Ichai C.: "Lactate acidosis in critically ill patients". Annals of Intensive Care, 2011. PMID: 21906328.
Inzucchi S.E. et al.: "Metformin in patients with type 2 diabetes and kidney disease". JAMA, 2014. DOI: 10.1001/jama.2014.13787.
National Institute for Health and Care Excellence (NICE): "Type 2 diabetes in adults: management". NICE Guideline NG28, 2022. Available at: www.nice.org.uk.

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