Sinus node dysfunction.
D001285:Atropine; D002304:Cardiac Pacing, Artificial; D003937:Diagnosis, Differential; D004562:Electrocardiography / Q000379:methods; D005080:Exercise Test; D006801:Humans; D011379:Prognosis; D012804:Sick Sinus Syndrome / Q000175:diagnosis* / Q000503:physiopathology; D012849:Sinoatrial Node / Q000503:physiopathology
D001285:Atropine