SAT136 Severe Lactic Acidosis Due To Metformin Use.

Abstract

Abstract Disclosure: A. Khan: None. Lactic acidosis is an important cause of metabolic acidosis. Broadly, etiology can be divided into type A (impaired tissue oxygenation), type B (systemic hypoperfusion), and D-lactic acidosis. One such etiology which deserves mentioning is metformin associated lactic acidosis (MALA). The incidence of MALA is more notable in the setting of kidney dysfunction, hepatic failure, and alcohol use. Severe acidosis due to Metformin is an emergency and warrants timely management to avoid further hemodynamic compromise. 73-year-old female with a history of hypertension and type II diabetes mellitus (on metformin) presented to the hospital with acute onset of abdominal pain, nausea, and vomiting. She reported having intermittent vomiting and diarrhea for three days prior to admission, and describes the abdominal pain as 10/10, sharp with radiation to the lower back, and worsening 6 hours prior to arrival. She denies fever, melena, hematochezia, change in appetite. She was brought to the hospital via EMS and was given fentanyl for her pain. Vitals on arrival were stable. On exam, she appeared in distress due to pain, with diffuse tenderness in her abdomen, with normal cardiac and lung exam. Labs showed leukocytosis 15 K/mm3, hemoglobin 11.1 gm/dl, hyperkalemia 5.7 mEq/L, bicarb <5 mEq/L, creatinine 13.4 mg/dl, BUN 107 mg/dl, venous lactate 15.1 mmol/l, lipase 435 U/L, ammonia 229 umol/L, with normal AST, ALT and ALP, and troponin. Urinalysis was negative. Initial ABG showed an unreadable pH, which was then repeated, and pH was noted to be 6.72, pCO2 of 29.4 mm/hg, CTA angiography was negative for dissection, mesenteric or bowel ischemia. Soon she was noted to be hypotensive and went into shock requiring pressors, bicarbonate drip, and broad-spectrum antibiotics. She eventually was intubated for airway protection. Subsequently, she was admitted to the ICU for possibly combined hypovolemic and septic shock with multi-organ dysfunction, severe lactic acidosis, acute kidney failure, and respiratory failure. Nephrology was consulted and dialysis was initiated. It was postulated that the presentation was likely due to metformin associated lactic acidosis (MALA). She required dialysis daily for 4 days and ultimately her kidney function improved. On discharge, she was not dialysis dependent. The case above illustrates the severity of lactic acidosis that can occur due to Metformin use. It is important to bear in mind that such presentation, may not necessarily occur on initiation of Metformin, but rather at any point of use. More importantly, its of utmost importance to consider effective therapeutic options like dialysis once severe academia is noted to allow correction of metformin induced acid-base disorder. Mortality estimates of MALA have been around 25-50%, highlighting the significance of prompt treatment of this condition. Presentation: Saturday, June 17, 2023