title: Which drugs cause preventable admissions to hospital? A systematic review.
abstract: OBJECTIVE
  Previous systematic reviews have found that drug-related morbidity accounts for 4.3% of preventable hospital admissions. None, however, has identified the drugs most commonly responsible for preventable hospital admissions. The aims of this study were to estimate the percentage of preventable drug-related hospital admissions, the most common drug causes of preventable hospital admissions and the most common underlying causes of preventable drug-related admissions.
  
  
  METHODS
  Bibliographic databases and reference lists from eligible articles and study authors were the sources for data. Seventeen prospective observational studies reporting the proportion of preventable drug-related hospital admissions, causative drugs and/or the underlying causes of hospital admissions were selected. Included studies used multiple reviewers and/or explicit criteria to assess causality and preventability of hospital admissions. Two investigators abstracted data from all included studies using a purpose-made data extraction form.
  
  
  RESULTS
  From 13 papers the median percentage of preventable drug-related admissions to hospital was 3.7% (range 1.4-15.4). From nine papers the majority (51%) of preventable drug-related admissions involved either antiplatelets (16%), diuretics (16%), nonsteroidal anti-inflammatory drugs (11%) or anticoagulants (8%). From five studies the median proportion of preventable drug-related admissions associated with prescribing problems was 30.6% (range 11.1-41.8), with adherence problems 33.3% (range 20.9-41.7) and with monitoring problems 22.2% (range 0-31.3).
  
  
  CONCLUSIONS
  Four groups of drugs account for more than 50% of the drug groups associated with preventable drug-related hospital admissions. Concentrating interventions on these drug groups could reduce appreciably the number of preventable drug-related admissions to hospital from primary care.
authors.affiliation: Nottingham Primary Care Research Partnership, Broxtowe & Hucknall PCT, Hucknall Health Centre, Nottingham, UK. rachel.howard@broxtowehucknall-pct.nhs.uk
authors.forename: R L
authors.initials: RL
authors.lastname: Howard
authors.forename: A J
authors.initials: AJ
authors.lastname: Avery
authors.forename: S
authors.initials: S
authors.lastname: Slavenburg
authors.forename: S
authors.initials: S
authors.lastname: Royal
authors.forename: G
authors.initials: G
authors.lastname: Pipe
authors.forename: P
authors.initials: P
authors.lastname: Lucassen
authors.forename: M
authors.initials: M
authors.lastname: Pirmohamed
mesh_terms: D000293:Adolescent; D000328:Adult; D016907:Adverse Drug Reaction Reporting Systems / Q000706:statistics & numerical data*; D000368:Aged; D017723:Drug Utilization Review; D064420:Drug-Related Side Effects and Adverse Reactions; D006302:Health Services Research; D006760:Hospitalization / Q000706:statistics & numerical data*; D006801:Humans; D008875:Middle Aged; D011320:Primary Health Care