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.
Nerve agents are the most toxic and fast-acting substances known in chemical warfare and, according to the US Centers for Disease Control and Prevention (CDC), VX is the most potent of all of them, including Sarin, which was developed in Germany in 1938 as a pesticide.