title: Severity prediction rules in community acquired pneumonia: a validation study.
abstract: BACKGROUND
  The British Thoracic Society (BTS) developed a rule (BTSr) based on severity criteria to predict short term mortality in adults admitted to hospital with community acquired pneumonia (CAP). However, neither the BTSr nor a recent modification of it (mBTSr) have been validated in the UK. A case-control study was conducted in a typical UK population to determine the clinical factors predictive of mortality and to assess the performance of these rules.
  
  
  METHODS
  Cases were drawn from all patients with CAP who died in 1997 in five large hospitals in the Mid Trent area. Controls were randomly selected from survivors. Factors associated with mortality were identified following review of medical case notes and performance of the severity prediction rules assessed.
  
  
  RESULTS
  Age >65 years, temperature <37 degrees C, respiratory rate >24 breaths/min, mental confusion, urea concentration of >7 mmol/l, sodium concentration of <135 mmol/l, and the presence of a pleural effusion, all determined on admission, were independently associated with in-hospital mortality on multivariate analysis. The BTSr was 52% sensitive and 79% specific in predicting death while the mBTSr displayed 66% sensitivity and 73% specificity.
  
  
  CONCLUSIONS
  The value of three of the four factors (presence of mental confusion, raised respiratory rate, raised urea) used in the mBTSr as predictors of mortality is confirmed. However, the BTSr and mBTSr did not perform as well in this validation study which included a high proportion (48%) of elderly patients (> or =75 years) compared with the derivation studies.
authors.affiliation: Respiratory Medicine, City Hospital, Nottingham NG5 1PB, UK.
authors.forename: W S
authors.initials: WS
authors.lastname: Lim
authors.forename: S
authors.initials: S
authors.lastname: Lewis
authors.forename: J T
authors.initials: JT
authors.lastname: Macfarlane
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D016022:Case-Control Studies; D017714:Community-Acquired Infections / Q000401:mortality*; D006801:Humans; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D011014:Pneumonia / Q000401:mortality*; D017410:Practice Guidelines as Topic; D011237:Predictive Value of Tests; D012307:Risk Factors; D012720:Severity of Illness Index