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Laboratory-Confirmed Metformin-Associated Lactic Acidosis

C Nestor¹, S Nasim², N Coyle³

¹Specialist Registrar, Irish National Anaesthesia Training Program

Irish Medical Journal

|October 26, 2019

Summary

This summary is machine-generated.

Metformin-associated lactic acidosis is a rare but serious complication of type 2 diabetes treatment. This case series highlights diagnostic challenges and risks of inappropriate prescription in vulnerable patients.

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Area of Science:

Internal Medicine
Pharmacology
Critical Care Medicine

Background:

Metformin is a first-line oral hypoglycemic agent for type 2 diabetes.
Metformin-associated lactic acidosis (MALA) is a rare but severe adverse effect.
Accurate diagnosis can be challenging due to limited laboratory testing.

Observation:

Three cases of MALA were prospectively identified and confirmed by laboratory testing.
Patients presented with severe lactic acidosis and elevated metformin levels.
All three patients required intensive care unit admission for supportive treatment.

Findings:

Two out of three patients with MALA died despite intensive care and continuous venovenous hemodialysis (CVVHD).
Elevated metformin levels were confirmed in all three cases, ranging from 3.9 to 48.7 mg/L.
The severity of acidosis (pH 6.7-6.95) and lactate levels (14.8-27.6 mmol/L) indicated critical illness.

Implications:

This case series underscores the critical importance of judicious metformin prescription, especially in patients with risk factors.
Diagnostic challenges associated with MALA necessitate increased awareness and accessible laboratory confirmation methods.
Inappropriate prescription in specific patient populations can lead to severe outcomes, emphasizing the need for careful patient selection and monitoring.