European Heart Rhythm Association(EHRA)
http://www.escardio.org/bodies/associations/EHRA

Guidelines da Sociedade Europeia de Cardiologia
http://www.escardio.org/knowledge/guidelines/Scientific_Statements

European Society of Cardiology
http://www.escardio.org

Heart Rhythm Society
http://www.hrsonline.org

Heart Rhythm Foundation
http://www.heartrhythmfoundation.org

American College of Cardiology
http://www.acc.org

American Heart Association
http://www.americanheart.org

Sociedade Brasileira de Arritmias Cardíacas
http://www.daec-sbc.org.br

Secção de Electrofisiologia e Arritmias da Sociedade Espanhola de Cradiologia
http://www.secardiologia.es/arritmias

Centers for Education & Research on Therapeutics: LQTS drugs
http://www.qtdrugs.org