?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rft.title=Atrial+Fibrillation+and+Hyperthyroidism%0A&rft.creator=Jayaprasad%2C+N&rft.creator=Francis%2C+Johnson&rft.subject=Indian+Pacing+and+Electrophysiology+Journal&rft.description=Atrial+fibrillation+occurs+in+10+%E2%80%93+15%25+of+patients+with+hyperthyroidism.+Low+serum+thyrotropin+concentration+is+an+independent+risk+factor+for+atrial+fibrillation.+Thyroid+hormone+contributes+to+arrythmogenic+activity+by+altering+the+electrophysiological+characteristics+of+atrial+myocytes+by+shortening+the+action+potential+duration%2C+enhancing+automaticity+and+triggered+activity+in+the+pulmonary+vein+cardio+myocytes.+Hyperthyroidism+results+in+excess+mortality+from+increased+incidence+of+circulatory+diseases+and+dysrhythmias.+Incidence+of+cerebral+embolism+is+more+in+hyperthyroid+patients+with+atrial+fibrillation%2C+especially+in+the+elderly+and+anti-coagulation+is+indicated+in+them.+Treatment+of+hyperthyroidism+results+in+conversion+to+sinus+rhythm+in+up+to+two-third+of+patients.+Beta-blockers+reduce+left+ventricular+hypertrophy+and+atrial+and+ventricular+arrhythmias+in+patients+with+hyperthyroidism.+Treatment+of+sub+clinical+hyperthyroidism+is+controversial.+Optimizing+dose+of+thyroxine+treatment+in+those+with+replacement+therapy+and+beta-blockers+is+useful+in+exogenous+subclinical+hyperthyroidism.%0A&rft.publisher=Indian+Pacing+and+Electrophysiology+Group&rft.contributor=Singh%2C+Balbir&rft.contributor=Lokhandwala%2C+Yash&rft.contributor=Francis%2C+Johnson&rft.contributor=Gupta%2C+Anup&rft.date=2005-10&rft.type=Journal+(Paginated)&rft.type=PeerReviewed&rft.format=text%2Fhtml&rft.identifier=http%3A%2F%2Fcogprints.org%2F4597%2F1%2Fjayaprasad.htm&rft.format=application%2Fpdf&rft.identifier=http%3A%2F%2Fcogprints.org%2F4597%2F2%2Fjayaprasad.pdf&rft.identifier=++Jayaprasad%2C+N+and+Francis%2C+Johnson++(2005)+Atrial+Fibrillation+and+Hyperthyroidism.++%5BJournal+(Paginated)%5D+++++&rft.relation=http%3A%2F%2Fcogprints.org%2F4597%2F