[Familial sinuatrial and atrioventricular arrhythmia causing an emergency case (author's transl)].

An acute life endangering bradycardy-tachycardy-syndrome in a 37 years old female could be referred to a rare familiar sinuatrial and atrioventricular arrhythmia with an inherited autosomal dominant trait. The patient's mother, three brothers, one sister and four children showed arrhythmias ranging from sinusbradycardia to second degree heart block. There was an obvious coincidence between intellectual retardation and the extent of the cardiac arrhythmia. Familial arrhythmias should be considered in instances of sudden death or rhythm disorders in young individuals.