BACKGROUNDSpecific allergen immunotherapy to Hymenoptera venom (VIT) is a basic treatment for patients allergic to Hymenoptera venom. The aim of the study was to evaluate the safety of an ultra-rush regimen compared with the rush and conventional protocols.MATERIALS AND METHODSIn 31 patients with an allergy to bee venom and 82 with an allergy to wasp venom, the allergic adverse reactions during VIT were monitored. Patients were selected based on the criteria established by EAACI (European Academy of Allergy and Clinical Immunology) recommendations. Adverse reactions during the ultra-rush immunotherapy were measured, documented and classified according to the criteria of Mueller. Ultra-rush, rush or conventional protocols of the initial phase VIT using the Venomenhal vaccine (Hal Allergy, Leiden, Netherlands) were conducted.RESULTSSix (13.7%) patients on the ultra-rush regimen, 5 (14.3%) patients on the rush regimen and 9 (26.5%) on conventional VIT experienced an allergic reaction. There were no associations between the adverse allergic reactions and the following factors: gender, total IgE and allergen-specific IgE to wasp or bee venom before the VIT and cardiological drugs that were used.CONCLUSIONWe found that the ultra-rush protocol (similar to the rush protocol) using the Venomenhal vaccine is safer than the conventional protocol.

01 Jan 2011·Journal of investigational allergology & clinical immunology

Serum tryptase level is a better predictor of systemic side effects than prostaglandin D2 metabolites during venom immunotherapy in children.

Article

Author: Gielicz, A ; Pietrzyk, J J ; Szczeklik, A ; Cichocka-Jarosz, E ; Brzyski, P ; Sanak, M

OBJECTIVESWe performed a prospective study to analyze mast cell mediators as predictors of systemic adverse reactions during rush venom-specific immunotherapy (VIT) in children.PATIENTS AND METHODSNineteen children aged 5-17 years received VIT with Venomenhal (HALAllergy). We analyzed serum tryptase (CAP, Phadia), plasma prostaglandin (PG) D2 metabolites (9alpha, 11beta-PGF2), and urine PGD2 metabolites (9alpha, 11beta-PGF2, tetranor-PGD-M) using gas chromatography mass spectrometry before and after the rush protocol.RESULTSThree boys with high baseline serum tryptase values (>7.76 g/L) (P < .001) and low 9alpha, 11beta-PGF2 concentrations developed grade III systemic adverse reactions during VIT. Baseline serum tryptase was lowest in children who had a Mueller grade II reaction (1.93 [0.36]) before VIT and highest in children with a Mueller grade III reaction (6.31 [4.80]) (P = .029). Repeated measures analysis of variance confirmed that, in children who developed systemic adverse reactions during VIT, serum tryptase was higher both before and after desensitization and increased significantly following the procedure. Analysis of PGD2 metabolites in the prediction of systemic adverse reactions during VIT was inadequate (sensitivity 67% and specificity 0.53%), whilst prediction based on serum tryptase was accurate.CONCLUSIONSIn children with severe systemic adverse reactions to Hymenoptera sting, the evaluation of baseline tryptase levels should be a standard procedure. Children with Apis mellifera venom allergy and baseline tryptase levels higher than 7.75 g/L are at risk of anaphylaxis during buildup. Lower baseline values of plasma and urinary PGD2 metabolite concentration in patients with systemic adverse reaction during VIT suggest that prostaglandin catabolism is altered.

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Hypersensitivity	NL	HAL Allergy Holding BV	01 Jan 2011

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