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Prognostic factors in intentional insulin self-poisoning and the significance of plasma insulin levels are unclear. We therefore conducted this study to investigate prognostic factors in insulin poisoning, in relation to the value of plasma insulin concentration.    Methods  We conducted a prospective study, and used logistic regression to explore prognostic factors and modelling to investigate toxicokinetic/toxicodynamic relationships.    Results  Twenty-five patients (14 female and 11 male; median [25th to 75th percentiles] age 46 [36 to 58] years) were included. On presentation, the Glasgow Coma Scale score was 9 (4 to 14) and the capillary glucose concentration was 1.4 (1.1 to 2.3) mmol/l. The plasma insulin concentration was 197 (161 to 1,566) mIU/l and the cumulative amount of glucose infused was 301 (184 to 1,056) g. Four patients developed sequelae resulting in two deaths. Delay to therapy in excess of 6 hours (odds ratio 60.0, 95% confidence interval 2.9 to 1,236.7) and ventilation for longer than 48 hours (odds ratio 28.5, 95% confidence interval 1.9 to 420.6) were identified as independent prognostic factors. Toxicokinetic/toxicodynamic relationships between glucose infusion rates and insulin concentrations fit the maximum measured glucose infusion rate (E max ) model (E max  29.5 [17.5 to 41.1] g/hour, concentration associated with the half-maximum glucose infusion rate [EC 50 ] 46 [35 to 161] mIU/l, and R 2  range 0.70 to 0.98;  n  = 6).    Conclusion  Intentional insulin overdose is rare. Assessment of prognosis relies on clinical findings. The observed plasma insulin EC 50  is 46 mIU/l.

Intentional overdose with insulin: prognostic factors and toxicokinetic/toxicodynamic profiles