Ventilator Management in Metformin-Associated Lactic Acidosis: A Case Report.

Area of Science:

• Critical Care Medicine
• Pulmonology
• Nephrology

Background:

• Mechanical ventilation initiation in profound metabolic acidosis presents unique challenges, especially during transport.
• Traditional guidelines suggest avoiding intubation in severe acidemia due to impaired patient-ventilator synchrony.
• Metformin-associated lactic acidosis (MALA) is a critical condition requiring careful management.

Observation:

• A patient with MALA (pH 6.51) required intubation due to altered mental status and airway protection issues.
• Maintaining adequate minute ventilation conflicts with the standard low tidal volume ventilation strategy.
• The patient had profound metabolic acidosis but no signs of acute respiratory distress syndrome (ARDS).

Findings:

• Clinician-managed mechanical ventilation can be less effective than patient's own compensatory ventilation in severe acidemia.
• Slightly increasing tidal volume in MALA patients without ARDS can improve respiratory efficiency.
• This strategy aids in maintaining acid-base homeostasis during mechanical ventilation.

Implications:

• Ventilatory strategies for metabolic acidosis may need individualization beyond standard low tidal volume protocols.
• Careful consideration of tidal volume adjustments can be crucial for managing acid-base status in specific patient populations.
• This approach may offer a viable alternative for managing patients with severe metabolic acidosis requiring mechanical ventilation.