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.
Declared a weapon of mass destruction by the UN, the banned chemical agent is more potent than any other. The VX nerve agent that killed North Koreaâs Kim Jong-nam is 100 times more deadly than the nerve gas sarin. Photograph: OJO Images/Rex/Shutterstock.