[Congenital C1-esterase inhibitor deficiency. A study of 4 Algerian families].

We present the results of a preliminary study (the first of this kind in Algeria) in which 4 families presenting with congenital deficiency of the C1-esterase inhibitor (C1-INH) responsible for hereditary angioneurotic oedema were biologically explored. The complement fractions C1-INH, C4 and C3d were assayed in 38 subjects of the 4 families. Extending this biological evaluation to all members of theses families enabled us to identify all asymptomatic subjects (46 percent in our series). In 2 patients the congenital disease was associated with systemic lupus erythematosus. Some clinico-biological discordances are reported and discussed in the light of data from the literature.