[Work-up of penicillin allergy].

Up to 10% of hospitalised patients are registered as penicillin allergic. However, 80-90% will tolerate penicillin after evaluation. New Danish guidelines suggest criteria for evaluation of patients based on risk stratification according to the severity of the index reaction. The allergy label can be removed immediately, if allergy can be ruled out using the criteria presented in this review, but all other patients should be referred for evaluation in a specialist allergy department. Specific IgE measurement should only be done in adult patients with an immediate reaction (onset less-than 2 h after intake of a tablet) or urticaria.

The Importance of Prolonged Provocation in Drug Allergy - Results From a Danish Allergy Clinic.

BACKGROUND: Drug provocation is the "Gold Standard" in drug allergy investigation. Recent studies suggest that a negative drug provocation on first dose should be followed by a prolonged provocation over several days. OBJECTIVE: To evaluate drug allergy investigations on the basis of drug provocation, including prolonged provocation. METHODS: Data from adult patients investigated for drug allergy in a Danish Allergy Clinic during the period 2010 to 2014 were entered into a database. Data included clinical details and results of provocations with suspected culprit drug (for penicillins performed only in specific IgE-negative patients). If provocation was negative on first dose, treatment was continued for 3 to 10 days. RESULTS: A total of 1,913 provocations were done in 1,659 patients, median age 46 years, of whom 1,237 (74.6%) were females. Drugs investigated were antibiotics, 1,776 (92.8%), of which 1,590 (89.5%) were penicillins; analgesics, 59 (3.1%); local anesthetics, 33 (1.7%); and other drugs, 45 (2.4%). In total, 211 of 1,913 (11.0%) provocations were positive. Causes were antibiotics, 198 (93.8%), of which 167 (84.3%) were penicillins; analgesics, 7 (3.3%); local anesthetics, 0; and other drugs, 6 (2.8%). Only 43 (20.4%) provocations were positive on first dose, whereas 95 (45.0%) turned positive more than 3 days later. CONCLUSIONS: Only 11.0% of the provocations were positive. Importantly, only 1 of 5 patients tested positive on the first dose, indicating that prolonged exposure should always be considered when drug provocation is included in allergy investigations. Most provocations were with penicillins, reflecting the pattern of antibiotic use in Denmark, which differs from that in other countries, especially outside Northern Europe.

Positive serum specific IgE has a short half-life in patients with penicillin allergy and reversal does not always indicate tolerance.

BACKGROUND: The positive and negative predictive values of specific IgE to penicillins are not well established for penicillin hypersensitivity. One reason may be that serum IgE levels to penicillin diminish over time. The objective in this study was to investigate variations in serum half-life (T½) for specific IgE to penicillins (s-IgE) and to evaluate the outcome of penicillin challenges in patients with previous but not present specific IgE to penicillins. METHODS: Two subgroups were investigated. All included patients had a history of penicillin allergy with reported symptoms such as urticaria/angioedema or unclassified cutaneous rash. T½ of specific IgE to penicillins was calculated based on sera from 29 patients with repeated measurements of s-IgE. Twenty-two patients with a previous positive s-IgE was followed and challenged with penicillin when IgE had become negative. RESULTS: The T½ for s-IgE varied between the 26 patients with decreasing s-IgE from 1.6 months to 76.4 months and 52% had a T½ of less than a year. The three patients with stable and increasing IgE-values showed T½ approaching infinity A total of 29 challenges with ß-lactams were performed. Four different patterns were seen when evaluating the clinical reaction to challenge (positive/negative) and post-challenge boost of s-IgE (yes/no). Eight (36.4%) had negative challenge and negative post-challenge s-IgE, eight (36.4%) negative challenge, but positive post-challenge s-IgE levels. 3 (13.6%) had positive challenge and positive post-challenge s-IgE whereas 3 (13.6%) were challenge positive, but had negative post-challenge s-IgE. CONCLUSION: Specific IgE to penicillins declines over time stressing the importance of a close time relation between diagnostic work-up and clinical reaction. Reversal of previously positive s-IgE may still be associated with positive penicillin challenges and/or re-boostering of s-IgE to positivity.

One-week oral challenge with penicillin in diagnosis of penicillin allergy.

Many patients experience reactions during penicillin treatment. The diagnosis may be difficult and is mainly based on short-term tests. The European Network for Drug Allergy (ENDA) guidelines proposed for diagnosing penicillin allergy do not include long-term challenge. In this study a total of 405 patients were evaluated. The ENDA guidelines were extended, to include a 7-day oral treatment (p.o.7) with penicillin for all patients who were negative in the ENDA programme. Among the 405 patients; 85 had an immediate reaction to penicillin, and a further 13 reacted during p.o.7. Among the 307 patients with a negative outcome, 88 had a case history of reaction to other ß-lactam antibiotics and were subsequently tested with the culprit drug. Thirteen patients had a positive outcome: 3 on single-dose challenge and 10 during p.o.7. The extended penicillin diagnostic work-up was positive in 111 patients, 30.0% showed immediate reactions and 5.7% reacted during p.o.7. Approximately 20% of all patients with positive outcome during penicillin challenge are detected by adding p.o.7 with penicillin to the original ENDA guidelines.

[Salivary gland tumors in the County of Funen, 1984-2003]. / Spytkirteltumorer i Fyns Amt 1984-2003.

INTRODUCTION: The objective of this study is to estimate the incidence of major salivary gland tumors in a geographically well-defined area (the County of Funen, Denmark) and to analyse the demographic data and distribution of histological types. MATERIALS AND METHODS: Patients with salivary gland tumors were identified through a search on pathology and diagnosis codes in the period 1984-2003, which initially resulted in a group of 951 patients. Of these a total of 682 patients (72%) fulfilled the criteria for inclusion. RESULTS: The incidence of major salivary gland tumors for the County of Funen is calculated to 7.3 per 100,000 residents per year. The material consisted of 372 females (55%) and 310 males (45%), with a median age of 56 years. Pleomorphic adenoma (55%) was the most common type, followed by adenolymphoma (29%). 90% of the tumors were found in the parotid gland - 93% benign and 7% malignant. 10% were located in the submandibular gland - 73% benign and 27% malignant. Only one neoplasm was located in the sublingual gland and it was malignant (100%). The older group harboured significantly more malignant neoplasms (12%) than the younger group (7%). The occurrence of pleomorphic adenomas among females (66%) was higher than among males (43%), on the other hand more adenolymphomas were found in males (43%) than in females (17%). CONCLUSION: The incidence of major salivary gland tumors in the County of Funen is calculated to 7.3 per 100,000 inhabitants per year which is equivalent to 383 new cases in Denmark per year.