© 1992 Oxford University Press
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Markers of Risk of Asthma Death or Readmission in the 12 Months Following a Hospital Admission for Asthma
Department of Medicine. Wellington School of Medicine PO Box 7343. Wellington. New Ztaland
Crane J (Department of Medicine, Wellington School of Medicine, PO Box 7343, Wellington, New Zealand), Pearce N, Burgess C, Woodman K, Robson B and Beasley R. Markers of risk of asthma death or readmission in the 12 months following a hospital admission for asthma. International Journal of Epidemiology 1992; 21: 737–744.
A case-control study has previously been reported of asthma deaths in people aged 5–45 years who had a hospital admission for asthma (the index admission) in New Zealand during 191–1987. The study has been re-analysed to examine the association between markers of asthma severity and risk of asthma death or hospital admission; patients prescribed fenoterol were excluded from this re-analysis because of the previously reported interaction between fenoterol, asthma severity, and asthma deaths. The re-analysis included 39 patients who died of asthma during the 12 months after their index admission, 226 patients who had a readmission for asthma during the 12 months after their index admission, and controls chosen from all index admissions. An admission in the previous 12 months was the strongest marker of subsequent risk of death (odds ratio (OR) = 3.5,95% confidence interval (CI): 1.8–6.9, P < 0.01), and was also a strong marker of subsequent risk of readmission (OR = 3.0, 95% CI: 2.1–4.2, P < 0.01); the risk increased with the number of previous admissions. Three or more categories of prescribed asthma drugs wrrs also associated with subsequent death (OR = 1.7,95% CI: 0.9–3.3, P = 0.13) or readmission (OR = 1.9,95% CI: 1.3–2.7, P < 0.01); prescribed oral corticosteroids was only weakly associated with subsequent death (OR = 1.3,95% CI: 0.6–2.8, P = 0.69), but was more strongly associated with subsequent readmission (OR = 1.9, 95% CI: 1.2–2.8, PPPP < 0.01). Of the four markers of acute asthma severity, (arterial carbon dioxide tension [PCO2], plasma potassium [K+], forced expiratory volume in 1 second [FEV1], peak expiratory flow rate [PEFR]) a PEFR < 100 l/min carrid a 2-fold risk of subsequent death or readmission, and a PCO2 
45 mm Hg was associated with an increased risk of death (but not of readmission). Prescription of psychotropic drugs was atso associated with an increased risk of death (but not of readmission). These findings indicate that the most valid and reliable marker of risk of asthma death or readmission is the number of hospital admissions for asthma in the previous 12 months.
Received 1 February 1992
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