Predictors of intermediate syndrome after organophosphorus poisoning and its management in Nepal

Organophosphorus (OP) poisoning is a global public health challenge, is common in agricultural regions, and is associated with high morbidity and mortality. Intermediate syndrome (IMS) is a delayed complication of OP poisoning that usually occurs 24-96 hours post-exposure and is characterized by proximal muscle weakness, cranial nerve palsies, and respiratory failure. The syndrome significantly increases mortality if not identified and managed promptly. This review comprehensively examines the predictors of IMS, including clinical, biochemical, and electrophysiological markers, and evaluates current management strategies. The key predictors are severe initial poisoning, low initial acetylcholinesterase level, and specific electrophysiological abnormalities. Management involves early recognition, antidote administration (atropine and oximes), respiratory support, and emerging therapies like magnesium sulfate. Challenges such as diagnostic uncertainty and resource constraints in low-income settings are discussed, alongside future directions for research and prevention. Understanding these predictors and optimizing management protocols are critical to improving outcomes in IMS following OP poisoning.