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Specialist Advice Support for Management of Severe Hereditary Angioedema Attacks: A Multicenter Cluster-Randomized Controlled Trial

Bernard Floccard 1 Gisele Kanny 2 Elinor Baker Ludovic Martin 3 Eric Vicaut 4 Frederic Adnet 5 Nicolas Javaud 6 Olivier Fain 7, 8, 9, 10 Isabelle Durand-Zaleski 11 David Launay 12, 13, 14 Laurence Bouillet 15 Anne Gompel 16, 17 Alain Sobel Maguy Woimant 5 Hasina Rabetrano 11 Tomislav Petrovic Frédéric Lapostolle 5, 18 Isabelle Boccon-Gibod 19, 15 Paul-Georges Reuter 20 Philippe Bertrand 21 Malha Mezaour 5 Brigitte Coppere 1
Abstract :

STUDY OBJECTIVE: Hereditary angioedema is a rare disease associated with unpredictable, recurrent attacks of potentially life-threatening edema. Management of severe attacks is currently suboptimal because emergency medical teams are often unaware of new specific treatments. The objective of this trial is to test whether a dedicated national telephone care-management strategy would reduce resource use during severe hereditary angioedema attacks.

METHODS: We conducted a cluster-randomized multicenter prospective trial of patients with a documented diagnosis of hereditary angioedema (type I, II or FXII hereditary angioedema). Participants were enrolled between March 2013 and June 2014 at 8 participating reference centers. The randomized units were the reference centers (clusters). Patients in the intervention arm were given a national free telephone number to call in the event of a severe attack. Emergency physicians in the SOS-hereditary angiœdema (SOS-HAE) call center were trained to advise or prescribe specific treatments. The primary outcome was number of admissions for angioedema attacks. Economic evaluation was also performed.

RESULTS: We included 100 patients in the SOS-HAE group and 100 in the control group. During the 2 years, there were 2,368 hereditary angioedema attacks among 169 patients (85%). Mean number of hospital admissions per patient in the 2-year period was significantly greater in the usual-practice group (mean 0.16 [range 0 to 2] versus 0.03 [range 0 to 1]); patient risk difference was significant: -0.13 (95% confidence interval -0.22 to -0.04; P=.02). Probabilistic sensitivity graphic analysis indicated a trend toward increased quality-adjusted life-years in the SOS-HAE group.

CONCLUSION: A national dedicated call center for management of severe hereditary angioedema attacks is associated with a decrease in hospital admissions and may be cost-effective if facilities and staff are available to deliver the intervention alongside existing services.

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Soumis le : lundi 25 mai 2020 - 03:35:47
Dernière modification le : samedi 21 mai 2022 - 03:20:47



Bernard Floccard, Gisele Kanny, Elinor Baker, Ludovic Martin, Eric Vicaut, et al.. Specialist Advice Support for Management of Severe Hereditary Angioedema Attacks: A Multicenter Cluster-Randomized Controlled Trial. Annals of Emergency Medicine, Elsevier, 2018, 72 (2), pp.194-203.e1. ⟨10.1016/j.annemergmed.2018.01.053⟩. ⟨hal-02616882⟩



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