Pathophysiology
Clinical meaning
Toxicology is the study of the adverse effects of chemical, physical, or biological agents on living organisms. A poisoning or overdose occurs when a substance is ingested, inhaled, absorbed, or injected in quantities sufficient to cause harmful physiological effects. The toxicological emergency is one of the most time-sensitive clinical scenarios because the window for effective antidote administration and decontamination may be narrow, and delays directly impact patient outcomes. Understanding toxidromes (toxic syndromes) is essential for rapid identification and initial management. A toxidrome is a constellation of signs and symptoms that, when recognized as a pattern, points to a specific class of causative agent. The four major toxidromes are: (1) Cholinergic toxidrome (organophosphates, nerve agents, certain mushrooms): results from excessive acetylcholine at muscarinic and nicotinic receptors due to acetylcholinesterase inhibition; produces the SLUDGE/BBB mnemonic -- Salivation, Lacrimation, Urination, Defecation, GI distress, Emesis / Bradycardia, Bronchospasm, Bronchorrhea; miosis (constricted pupils) is a key finding; death occurs from bronchospasm and respiratory secretions drowning the airways. (2) Anticholinergic toxidrome (antihistamines, tricyclic antidepressants, atropine, jimsonweed): results from blockade of muscarinic acetylcholine receptors; produces the mnemonic...