title: Late HIV diagnosis is a major risk factor for intensive care unit admission in HIV-positive patients: a single centre observational cohort study.
abstract: BACKGROUND
  HIV positive patients are at risk of infectious and non-infectious complications that may necessitate intensive care unit (ICU) admission. While the characteristics of patients requiring ICU admission have been described previously, these studies did not include information on the denominator population from which these cases arose.
  
  
  METHODS
  We conducted an observational cohort study of ICU admissions among 2751 HIV positive patients attending King's College Hospital, South London, UK. Poisson regression models were used to identify factors associated with ICU admission.
  
  
  RESULTS
  The overall incidence rate of ICU admission was 1.0 [95% CI 0.8, 1.2] per 100 person-years of follow up, and particularly high early (during the first 3 months) following HIV diagnosis (12.4 [8.7, 17.3] per 100 person-years compared to 0.37 [0.27, 0.50] per 100 person-years thereafter; incidence rate ratio 33.5 [23.4, 48.1], p < 0.001). In time-updated analyses, AIDS and current CD4 cell counts of less than 200 cells/mm3 were associated with an increased incidence of ICU admission while receipt of combination antiretroviral therapy (cART) was associated with a reduced incidence of ICU admission. Late HIV diagnosis (initial CD4 cell count <350 or AIDS within 3 months of HIV diagnosis) applied to 81% of patients who were first diagnosed HIV positive during the study period and who required ICU admission. Late HIV diagnosis was significantly associated with ICU admission in the first 3 months following HIV diagnosis (adjusted incidence rate ratio 8.72, 95% CI 2.76, 27.5).
  
  
  CONCLUSIONS
  Late HIV diagnosis was a major risk factor for early ICU admission in our cohort. Earlier HIV diagnosis allowing cART initiation at CD4 cell counts of 350 cells/mm3 is likely to have a significant impact on the need for ICU care.
authors: King's College Hospital, Bessemer Road, London, UK.
authors: Julia
authors: J
authors: Shrosbree
authors: Lucy J
authors: LJ
authors: Campbell
authors: Fowzia
authors: F
authors: Ibrahim
authors: Phillip
authors: P
authors: Hopkins
authors: Marcela
authors: M
authors: Vizcaychipi
authors: Stephanie
authors: S
authors: Strachan
authors: Frank A
authors: FA
authors: Post
mesh_terms: D000328:Adult; D015331:Cohort Studies; D057210:Delayed Diagnosis; D005260:Female; D015658:HIV Infections / Q000175:diagnosis* / Q000453:epidemiology; D006679:HIV Seropositivity / Q000175:diagnosis / Q000453:epidemiology; D006760:Hospitalization; D006801:Humans; D015994:Incidence; D007362:Intensive Care Units; D008131:London / Q000453:epidemiology; D008297:Male; D008875:Middle Aged; D012307:Risk Factors