Introduction and exegesis. - The authors report a case of sinus node dysfun
ction that occurred in a 22-year-old patient with Graves' disease and disap
peared after thyroidectomy.
Conclusion. - Bradycardia is uncommon ill hyperthyroidism, the sinus node d
ysfunction would be due to thyrotoxicity-related myocarditis. (C) 1999 Else
vier; Paris.