High-Dose Insulin Therapy in Aluminum Phosphide Poisoning

Clinical Indications for Initiation

The presence of myocardial dysfunction strengthens the indication for high-dose insulin therapy, as insulin provides direct positive inotropic effects similar to its use in calcium channel blocker poisoning, according to the American College of Critical Care Medicine 1, 2

Administer an initial bolus of 1 U/kg regular insulin IV, followed by continuous infusion of 1 U/kg/hour, with doses up to 10 U/kg/hour used in refractory cases, as recommended by the American College of Critical Care Medicine 1, 2, 3

The recommendation for high-dose insulin therapy in aluminum phosphide poisoning is based primarily on recent randomized controlled trials and open-label studies, showing consistent mortality benefit, with a dosing protocol extrapolated from well-established calcium channel blocker poisoning guidelines, according to the American College of Critical Care Medicine 1, 2, 3

Potassium levels must be monitored closely as insulin drives potassium intracellularly; supplementation is typically required, according to the American College of Critical Care Medicine 4, 5
The large dextrose infusions required to maintain euglycemia can cause fluid overload, as noted by the American Heart Association 6, 7

An initial bolus of 1 U/kg regular insulin IV, followed by a continuous infusion of 1 U/kg/hour, titrated to clinical effect, is recommended by the American Association of Clinical Endocrinologists, with dextrose co-administration to maintain euglycemia 8, 4, 5, 9
Potassium supplementation is necessary to maintain normal levels, as supported by the American College of Critical Care Medicine 4, 5

High-dose insulin with euglycemia works primarily by providing direct positive inotropic effects on the myocardium, switching cellular metabolism from fatty acids to carbohydrates, and restoring intracellular calcium flux, which collectively improve cardiac contractility and hemodynamic stability in severe poisoning 10
Insulin exerts a direct positive inotropic effect on myocardial contractility independent of its metabolic actions 10
This inotropic benefit is particularly valuable in calcium channel blocker and beta-blocker poisoning where myocardial dysfunction predominates 10, 11

The presence of myocardial dysfunction strengthens the indication for high-dose insulin therapy, though it should be considered first-line treatment in severe poisoning even before myocardial function is formally assessed 10
The Society of Critical Care Medicine recommends high-dose insulin as first-line treatment for documented myocardial dysfunction in calcium channel blocker poisoning 10
In refractory shock or periarrest situations, high-dose insulin is recommended even without documented myocardial dysfunction 11

Standard dosing consists of 1 U/kg regular insulin IV bolus followed by continuous infusion of 1 U/kg/hour, with titration up to 10 U/kg/hour in refractory cases 10, 11
Dextrose must be co-administered to maintain euglycemia, typically requiring large infusions 10