What is the mechanism of action of an organophosphate?
The key feature of organophosphate insecticides is the inhibition of carboxyl ester hydrolases, chiefly inhibition of acetylcholinesterase (AChE). This enzyme plays a vital role in the breakdown of the neurotransmitter acetylcholine, which is found in both the peripheral and central nervous systems.
What is acute OP poisoning?
Definition. Acute organophosphorus poisoning occurs after dermal, respiratory, or oral exposure to either low volatility pesticides (e.g., chlorpyrifos, dimethoate) or high volatility nerve agents (e.g., sarin, tabun).
What happens in OP poisoning?
Organophosphate poisoning is poisoning due to organophosphates (OPs). Organophosphates are used as insecticides, medications, and nerve agents. Symptoms include increased saliva and tear production, diarrhea, vomiting, small pupils, sweating, muscle tremors, and confusion.
What is the pathophysiology behind the cause of the sludge process?
Cause. Cholinergic crisis, sometimes known by the mnemonic “SLUDGE syndrome” ( Salivation, Lacrimation, Urination, Defecation, Gastrointestinal distress and Emesis), can be a consequence of: Contamination with – or excessive exposure to – certain chemicals including: nerve agents, (e.g. sarin, VX, Novichok agents).
Why atropine is used in OP poisoning?
Atropine is given to poisoned patients to block muscarinic overstimulation. However, neuromuscular blocking agents (nicotinic acetylcholine receptor antagonists) are not currently used to prevent nicotinic overstimulation 57.
Which is the most important drug in the treatment of organophosphate poisoning?
The mainstays of medical therapy in organophosphate (OP) poisoning include atropine, pralidoxime (2-PAM), and benzodiazepines (eg, diazepam). Initial management must focus on adequate use of atropine. Optimizing oxygenation prior to the use of atropine is recommended to minimize the potential for dysrhythmias.
What is the mode of action of OPS and carbamates?
Organophosphate and carbamate insecticides are designed to kill different insects and other pests. They share the same target in both insects and mammals, including humans; in fact, they act by inhibiting the neural enzyme acetylcholinesterase.
Is sludge sympathetic or parasympathetic?
SLUDGE (Salivation, Lacrimation, Urination, Defecation Gastrointestinal upset: emesis] is a syndrome of pathological effects indicative of massive discharge of the parasympathetic nervous system. Unlikely to occur naturally, SLUD is usually encountered only in cases of drug overdose or exposure to nerve gases.
What causes cholinergic poisoning?
The most common cause of cholinergic toxicity worldwide is exposure to organophosphate and carbamate insecticides. Exposure to these insecticides may be through inhalation of vapors, ingestion, or direct contact of the chemical with the skin or mucous membrane.
