WebMD Symptom Checker helps you find the most common symptom combinations and medical conditions related to palpitations (fluttering in chest). Click on the combination that matches your symptoms to find the conditions that may cause these problems.
Nerve agents are a class of phosphorus-containing organic chemicals (organophosphates) that disrupt the mechanism by which nerves transfer messages to organs. The disruption is caused by blocking acetylcholinesterase, an enzyme that normally destroys acetylcholine, a neurotransmitter.
VX, short for venomous agent X, is the best known of Tammelin's esters, named for the member of the Swedish National Defence Research Institute who first studied them; now one of a broader V-series of agents, they are classified as nerve agents and have been used as a chemical weapon in various recorded deadly attacks.