Abstract:
BACKGROUND:The beta-lactam allergic work-up is mostly standardized. However, the negative predictive value of drug provocation tests is not yet well established. METHOD:A historical-prospective multicentre cohort study was conducted in four centres (one in France, one in Portugal, two in Italy) to assess the negative predictive value of provocation tests with beta-lactams in patients initially tested for a suspicion of drug allergy/hypersensitivity. Patients were contacted at least 6 months after the work-up, between 2003 and 2007. A new allergic work-up was proposed to reacting patients. RESULTS:Among the 457 patients included, 365 (79.9%) were followed up (159 [79.1%] from France, 153 [82.7%] from Italy and 53 [74.6%] from Portugal). Only 118 (25.8%) were re-exposed to the negatively tested beta-lactam. Nine (7.6%) reported a non-immediate (occurring more than 1 h after drug administration) reaction: five urticaria, three exanthema and one undefined cutaneous reaction. None were severe. Only four accepted a re-challenge, negative in two cases and positive in the two others. The negative predictive value was 94.1% (89.8-98.3) (111 out of 118 patients). CONCLUSION:Although the negative predictive value of drug provocation tests may not be 100%, none of the false negative patients experienced a life-threatening reaction. This should reassure doctors who might hesitate to prescribe beta-lactams, even in patients with negative allergic work-ups.
journal_name
Allergyjournal_title
Allergyauthors
Demoly P,Romano A,Botelho C,Bousquet-Rouanet L,Gaeta F,Silva R,Rumi G,Rodrigues Cernadas J,Bousquet PJdoi
10.1111/j.1398-9995.2009.02228.xsubject
Has Abstractpub_date
2010-03-01 00:00:00pages
327-32issue
3eissn
0105-4538issn
1398-9995pii
ALL2228journal_volume
65pub_type
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