Compared with euthyroid patients , hypothyroid patients were more likely to have a history of stroke , had worse renal function and higher N-terminal pro-B-type natriuretic peptide ( NT-proBNP ) levels , were more likely to be treated with an antiarrhythmic drug ( or have an implantable cardioverter defibrillator ) , and were less likely to smoke or be treated with a beta-blocker or angiotensin-converting enzyme inhibitor/angiotensin receptor blocker .