Substances That Can Cause Heart Rhythm Disorders
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http://www.hrspatients.org/patients/substances/default.asp 
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Description
Thousands of substances have the potential to affect the heart's electrical system and alter its ability to pump blood through the body. Many illegal, prescription and over-the-counter drugs, as well as certain foods can affect the electrical signals that stimulate the heartbeat. This document describes substances that can cause heart rhythm disorders, including alcohol, tobacco, and substances in the environment and workplace.