[Congenital total AV block in the direct fetal electrocardiogram]

The congenital total av-block in the fetal electrocardiogram is a rare condition with a frequency of 1:20 000. The reason are heart failure and umbilical cord complications, but probably immunological reactions may be the source of a part of these blocks. In the sera of mothers, which have born children with a congenital total av-block, antibodies of IgG-class would be found, for instance anti-Ro (SS-A) and anti-La (SS-B). These mothers had or developed a connective-tissue disease (Sjögren's syndrome or Lupus erythematosus). This means a new behavior for the obstetrician detecting pre- or intranatally a total av-block. A own case will be demonstrated together with a differential diagnostical example of interference dissoziation.