IC: intervalo de confiança; CEC: circulação extracorpórea; ECMO: membrana de oxigenação extracorpórea; PS: pronto socorro; Hb: hemoglobina; UTI: unidade de terapia intensiva; OR: odds ratio; pré: período pré-operatório. The gene discussed is GSTM1; the disease is bacterial urinary tract infection.