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RESPIRATORY INFECTION |
1 Respiratory Infection Research Group, Respiratory Medicine, Nottingham City Hospital, Nottingham NG5 1PB, UK
2 Medical Centre Alkmaar, PO Box 501, 1800 AM Alkmaar, The Netherlands
3 Christchurch School of Medicine and Health Sciences, University of Otago, Christchurch Hospital, Christchurch, New Zealand
4 Waikato Respiratory Department, Health Waikato, Hamilton, New Zealand
5 Division of Respiratory Medicine, Nottingham City Hospital, Nottingham NG5 1PB, UK
Correspondence to:
Correspondence to:
Dr J T Macfarlane, Respiratory Infection Research Group, Respiratory Medicine, Nottingham City Hospital, Nottingham NG5 1PB, UK;
john.macfarlane{at}tinyworld.co.uk
Background: In the assessment of severity in community acquired pneumonia (CAP), the modified British Thoracic Society (mBTS) rule identifies patients with severe pneumonia but not patients who might be suitable for home management. A multicentre study was conducted to derive and validate a practical severity assessment model for stratifying adults hospitalised with CAP into different management groups.
Methods: Data from three prospective studies of CAP conducted in the UK, New Zealand, and the Netherlands were combined. A derivation cohort comprising 80% of the data was used to develop the model. Prognostic variables were identified using multiple logistic regression with 30 day mortality as the outcome measure. The final model was tested against the validation cohort.
Results: 1068 patients were studied (mean age 64 years, 51.5% male, 30 day mortality 9%). Age 
65 years (OR 3.5, 95% CI 1.6 to 8.0) and albumin <30 g/dl (OR 4.7, 95% CI 2.5 to 8.7) were independently associated with mortality over and above the mBTS rule (OR 5.2, 95% CI 2.7 to 10). A six point score, one point for each of Confusion, Urea >7 mmol/l, Respiratory rate 30/min, low systolic(<90 mm Hg) or diastolic (
60 mm Hg) Blood pressure), age 65 years (CURB-65 score) based on information available at initial hospital assessment, enabled patients to be stratified according to increasing risk of mortality: score 0, 0.7%; score 1, 3.2%; score 2, 3%; score 3, 17%; score 4, 41.5% and score 5, 57%. The validation cohort confirmed a similar pattern.
Conclusions: A simple six point score based on confusion, urea, respiratory rate, blood pressure, and age can be used to stratify patients with CAP into different management groups.
Keywords: prediction rule; community acquired pneumonia; severity assessment
Relevant Article
Thorax 2003 58: 371.
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 Other articles noted Evid. Based Med., January 1, 2004; 9(1): 31 - 32. [Full Text] [PDF]
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