Genotyping performed on DNA isolated from 720 hip fracture elderly patients concluded that AA genotype of the SLC6A3 gene (rs393795) is protective for the development of delirium while genetic polymorphisms in the receptor DRD2 and dopamine transporter genes, were associated with delirium (rs6276, rs6277, and rs2734839) (Munster et al., 2011). This evidence concerns the gene SLC6A3 and delirium.