Sudden cardiac death (SCD) is defined as a non-violent death that cannot be explained, occurring less than 24 hours from the onset of symptoms. 
Out of all antiarrhythmic agents, only beta-blockers have been shown to be effective at reducing the risk of SCD. According to a new meta-analysis of all randomized control studies evaluating beta blockers vs. placebos, beta-blockers reduce the risk of SCD by 31%, cardiovascular death (CVD) by 29% and all-cause mortality by 33%. These results confirm the mortality benefits of these drugs and they should be recommended to all patients similar to those included in the trials.
 The International Classification of Diseases Version 10 ( ICD-10; Code No. 146.1) Geneva, Switzerland: WHO Press; 2010.