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Metformin and lactic acidosis: cause or coincidence? A review of case reports Stades AM; Heikens JT; Erkelens DW; Holleman F; Hoekstra JBJ Intern Med 2004[Feb]; 255 (2): 179-87OBJECTIVE: Metformin has been associated with the serious side-effect lactic acidosis. However, it remains unclear whether the use of metformin was a cause or a coincidence in lactic acidosis. DESIGN: A literature search of the Index Medicus (1959-66) and of the databases Embase, Medline, Medline Express (1966-99) was performed using the keywords metformin, biguanides and lactic acidosis. All articles of cases with metformin-induced lactic acidosis (MILA) were cross-referenced. SUBJECTS: Cases were included for analysis if they met the following criteria: serum pH < or =7.35, lactate concentration > or =5 mmol L(-1). INTERVENTION: A forum of six experts in intensive care medicine independently categorized the cases in MILA unlikely (score 0), possible MILA (score 1) or probable MILA (score 2). MAIN OUTCOME MEASURES: Statistical analysis included the paired interobserver agreement (kappa) and multivariate regression analysis. RESULTS: Of 80 reported cases, 33 were excluded because of insufficient quality. The forum scores of the remaining 47 cases were distributed normally with a mean score of 7 (range 2-10). The kappa-value was 0.041 (SD = 0.24, range -0.514, 0.427). Neither lactate concentration nor mortality correlated with serum metformin concentrations. CONCLUSIONS: Given the low interobserver agreement and the lack of any relationship between metformin levels and outcome parameters, the concept that there is a simple, causal relationship between metformin use and lactic acidosis in diabetic patients has to be reconsidered.|Acidosis, Lactic/*chemically induced[MESH]|Adult[MESH]|Aged[MESH]|Aged, 80 and over[MESH]|Diabetes Mellitus, Type 2/drug therapy[MESH]|Female[MESH]|Humans[MESH]|Hypoglycemic Agents/*adverse effects[MESH]|Male[MESH]|Medical Records[MESH]|Metformin/*adverse effects[MESH]|Middle Aged[MESH]|Regression Analysis[MESH]|Risk Factors[MESH] |
