A species that possesss great variability in social characteristics, economic, dietary and cultural, beyond more, the inexistence of an easy animal model and low cost for more invasive and conclusive studies, does not allow the adequate determination of the etiology, therapeutical fisiopatologia and (Takiuti, Kahhale and Zugaib, 2000). According to Rudge (1994), it has tracks enough to consider the toxemia as illness of multiple agencies, with endotelial disfuno, being the common way and final in its etiology and patognese, however, it has not been given accurate. 3. RISK FACTORS the degree of probability of the occurrence of one Is understood for risk determined event (Pear tree, 2000). Relative risk informs how many times a risk is bigger in a group, if compared with another one.
To if analyzing the risk factors, it can, of an indirect form, to arrive at the concept of pregnancy of high risk (Gomes et al, 2001). Diverse recognized factors as predisponent with respect to the toxemia, authors according to searched will be pointed, which relate the DHEG with the age materna, parity, race, multiple pregnancy, partner-economic level, obesidade, chronic hipertenso arterial, antecedent familiar, diabetes mellitus, estresse, nefropatia, tobaccoism, alcohol, caffeine and manual work. 3,1 AGE MATERNA In Brazil, currently, of the four million women who are pregnant per year, about 20% is adolescent (Lins et al, 2001). The toxemia is more frequent in age extremities, below of the 18 years or above of the 35 years (Saints, Timerman and Andrade, 2000; Gomes, Matuo and Carvalheiro, 2000; Pascoal, 2002; Arajo et al, 1998; Ziegel and Granley, 1995; Cabral, Costa and Cabral Jr, 2003; Coast et al, 2002; Lins et al, 2001; Zampieri, 2000; Alencar Jr, 2000; Nurdan, Mattar and Camano, 2003 and Kahhale et al, 2000). Controversies how much to the fact of the gestation in the adolescence exist to increase the risk of obsttricas complications.