Certain substances can contribute to an abnormal/irregular heartbeat, including: 1  Caffeine. 2  Tobacco. 3  Alcohol. 4  Cold and cough medications. 5  Appetite suppressants. 6  Psychotropic drugs (used to treat certain mental illnesses) 7  Antiarrhythmics (paradoxically, the same drugs used to treat arrhythmia can also cause arrhythmia.
Founded as an independent company in 1982, RSA Security, Inc. was acquired by EMC Corporation in 2006 for US$2.1 billion and operates as a division within EMC. RSA is based in Bedford, Massachusetts, with regional headquarters in Bracknell (UK) and Singapore, and numerous international offices.
NRA Certified Range Safety Officer (RSO) This NRA RSO certification will allow you to run range activities including range activities for the Boy Scouts of American (BSA) events. The BSA require that a Certified RSO (separate from the instructor(s)) is present to run the range at all BSA shooting events. You need to be an NRA Certified Instructor to train at BSA events. Refer to this webpage for more details on working with the BSA.