title: [Genotypic resistence in patients infected with HIV and its correlation with therapy].
abstract: OBJECTIVE
  Our goal was to establish the different therapeutic regimens used in our clinical setting, and to determine the prevalence of genotypic resistances in patients under antiretroviral therapy, analyzing the relationship between the appearance of mutations and treatments along with other HIV related variables.
  
  
  METHODS
  191 samples from the same number of patients who were on antiretroviral therapy and virological failure were analyzed. Samples were processed by means of the genotypic technique LiPA in order to study the presence of mutations in the reverse transcriptase (RT) and the protease (P) genes. Prescribed therapeutic regimens and epidemiological variables relevant in HIV infection were also analyzed.
  
  
  RESULTS
  Overall resistance prevalence was 72.32%. By LiPA, RT mutations were detected in 71.43% of patients, being M184V, T215Y and L41M the most frequent ones. Moreover, P mutations were detected in 59.38% of cases, being V82A, L90M and I84V the most frequent ones. 61.02% of the patients presented one or more mutations against the reverse transcriptase inhibitors included in their treatment. With regard to protease inhibitors, this fact was documented in 28.81% of cases, and in 23.73% of patients receiving both reverse transcriptase inhibitors and protease inhibitors.
  
  
  CONCLUSIONS
  Although the analysis of the mutation patterns by LiPA has known limitations, the prevalence of resistances in our study was different from that reported by other authors, being lower in the P gene and higher in the RT one. Of note, a high proportion of patients showed mutations against the drugs included in their prescribed treatment.
authors.affiliation: Servicio de Microbiología, Hospital Clínico Universitario, Facultad de Medicina, Valladolid, Spain. eiros@isciii.es
authors.forename: José M
authors.initials: JM
authors.lastname: Eiros
authors.forename: Raquel
authors.initials: R
authors.lastname: Blanco
authors.forename: Cristina
authors.initials: C
authors.lastname: Labayru
authors.forename: Beatriz
authors.initials: B
authors.lastname: Hernández
authors.forename: Agustín
authors.initials: A
authors.lastname: Mayo
authors.forename: Raúl
authors.initials: R
authors.lastname: Ortiz de Lejarazu
mesh_terms: D024882:Drug Resistance, Viral / Q000235:genetics; D005260:Female; D005838:Genotype; D006678:HIV / Q000187:drug effects* / Q000235:genetics*; D015658:HIV Infections / Q000188:drug therapy*; D006801:Humans; D008297:Male