title: Long-term outcomes in patients with sickle cell disease and frequent vaso-occlusive crises.
abstract: BACKGROUND
  The frequency of vaso-occlusive crises correlates with mortality in patients with sickle cell disease (SCD). We examined the degree to which a high number of hospitalization days for these events affected survival.
  
  
  METHODS
  We reviewed data for 58 adult patients with SCD (mean age, 29.9 +/- 7.3 years) treated at our hospital between 1986 and 1994 who had at least 100 hospitalization days during any of these years. Their mean follow up period was 6.65 years (median, 6.84 years; range, 0.15-14.51 years).
  
  
  RESULTS
  Thirty-five patients (60.3%) died during follow-up. In multivariate analysis that included age, gender, and numbers of transfusions and hospitalization days, only age was significantly associated with mortality. The National Cooperative Study of Sickle Cell Disease (CSSCD) estimates the 10-year mortality at 15% for all 20-year old SS patients and also for all 30-year-old women. For 30-year-old men, the CSSCD estimated a 10-year mortality of about 28%. Thus, the 60.3% mortality of our patients after a median follow-up of only 6.84 years was substantially higher. Fifty-one patients were still alive after 1992, when hydroxyurea became available for SCD. The median survival of 15 hydroxyurea-treated patients was 7.3 years, compared with 4.3 years in 36 patients who did not take the drug.
  
  
  CONCLUSIONS
  Mortality for patients with SCD with a high number of hospitalization days was much higher than that expected for patients with SCD in general. There was a (nonsignificant) trend for longer survival in these severely ill patients if they took hydroxyurea.
authors.affiliation: Center for Sickle cell Disease, Howard University, College of Medicine, Washington DC 20060, USA.
authors.forename: Rajinder
authors.initials: R
authors.lastname: Prasad
authors.forename: Syed
authors.initials: S
authors.lastname: Hasan
authors.forename: Oswaldo
authors.initials: O
authors.lastname: Castro
authors.forename: Elliott
authors.initials: E
authors.lastname: Perlin
authors.forename: Kyungsook
authors.initials: K
authors.lastname: Kim
mesh_terms: D000328:Adult; D000755:Anemia, Sickle Cell / Q000401:mortality* / Q000503:physiopathology / Q000628:therapy; D000986:Antisickling Agents / Q000627:therapeutic use; D002423:Cause of Death; D005260:Female; D005500:Follow-Up Studies; D006760:Hospitalization; D006801:Humans; D006918:Hydroxyurea / Q000627:therapeutic use; D007902:Length of Stay; D008297:Male; D011788:Quality of Life; D015996:Survival Rate; D016896:Treatment Outcome
chemical_list: D000986:Antisickling Agents; D006918:Hydroxyurea