title: Progressive familial heart block. Part I. Extent of the disease.
abstract: Progressive familial heart block (type I) has been identified in the RSA. Since 1977 many families have been referred for pedigree tracing. The present probands of some 9 pedigrees are the descendants of specific children of an immigrant; other genetic diseases appear in these pedigrees. The necessity of identifying, diagnosing and possibly treating the descendants of carriers is emphasized.
mesh_terms: D006327:Heart Block / Q000235:genetics*; D006801:Humans; D010375:Pedigree; D013019:South Africa