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OBJECTIVE: Hereditary angiœdema (HAE) is a rare autosomal dominant disease characterized by recurrent, unpredictable, potentially life-threatening swelling. Objective is to assess the management of the acute HAE attacks in the real life setting through a call center in France. METHODS: A pre-specified ancillary study of SOS-HAE, a cluster-randomized prospective multicenter trial, was conducted. HAE patients were recruited from 8 participating reference centers. The outcome of interest was the rate of hospitalization. RESULTS: onerhundred patients were included. The median (quartile) age was 38 (29-53) years, and 66 (66%) were female. Eighty (80%) patients had HAE type I, 8 (8%) had HAE type II and 12 (12%) patients had FXII-HAE. Fifty-one (51%) patients had experienced at least one time the call center during the follow-up. Nine over 166 (5%) attacks for 9 different patients resulted in hospital admission to the hospital (in the short-stay unit, ie, <24 h) during the follow-up period. During 2 years, there were 166 calls to call center for 166 attacks. All attacks were treated at home after call center contact. CONCLUSIONS: Use of emergency departments and hospitalizations are reduced by the use of a coordinated national call center in HAE after therapeutic education program that promoted self-administration of specific treatment and use of call to call center. TRIAL REGISTRATION: clinicalTrials.gov identifier: NCT01679912.
Use of emergency departments and hospitalizations are reduced by the use of a coordinated national call center in HAE after therapeutic education program that promoted self-administration of specific treatment and use of call to call center.
the intervention-only descriptive analysis provides no concurrent counterfactual for the claimed reduction
Nine over 166 (5%) attacks for 9 different patients resulted in hospital admission to the hospital during the follow-up period.
directly reported attack-level count consistent across the Summary, Results, and Table 2
All attacks were treated at home after call center contact.
directly observed descriptive outcome reported consistently in the Summary and Results
The course was favorable for all 166 attacks with a median time from treatment to onset of symptom relief of 1.9 (0.5-11.9) hours.
prospectively collected descriptive outcomes lack a comparator and inferential uncertainty estimates
Derived from the full evaluation — not a separate score.
Strengths
Emergency physicians collected standardized information on attack triggers, sites, treatment timing, symptom relief, EMS dispatch, and admission over two years. This provides a detailed operational account of 166 calls and attacks.
↳ Methods, p. 5; Table 2
The intervention connected HAE patients, trained emergency physicians, reference centers, and EMS through centralized calls and predefined treatment recommendations. It was implemented across eight French reference centers rather than described only conceptually.
↳ Methods, p. 4; Table 3
The Discussion compares attack patterns, treatment rates, and emergency utilization with prior cohorts and explicitly notes that tranexamic acid use was inconsistent with international guidance.
↳ Discussion, pp. 8–9
Limitations
The ancillary analysis includes only the intervention arm and uses descriptive statistics, so it cannot establish whether the call center reduced emergency visits or hospitalization relative to usual practice.
↳ Methods, pp. 4–5; Conclusion, p. 10
The Limitations section says that no causal link can be demonstrated, but the Abstract and Conclusion attribute reduced emergency use and hospitalization to the call center.
↳ Abstract; Limitations and Conclusion, p. 10
Participants were followed through an expert HAE network, had emergency treatment at home, and almost all received self-administration training. The paper acknowledges that this may select “over-performing” patients but does not quantify the effect.
↳ Results, p. 6; Limitations, p. 10
The prospective data collection and detailed attack-level reporting support the paper’s descriptive account of real-world call-center management. The main score constraint arises because the Methods analyze only intervention-arm attacks, while the Abstract and Conclusion assert that the call center reduced emergency use and hospitalization. That assertion also conflicts directly with the Limitations section’s statement that no causal link could be demonstrated. Practical relevance remains visible because the pathway was implemented across eight reference centers, although transfer depends on specialist infrastructure, home medication, and patient education.
Nabu’s assessment, alongside the field’s view.
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Limited2.6
Confidence mediumThe study contributes prospective operational data on 166 attacks managed through a coordinated HAE call center, including timing, treatment, EMS dispatch, and admission. Its advance is bounded because the ancillary report does not present the parent trial’s randomized comparison.
“During 2 years, there were 166 calls to call center for 166 attacks.”
Standardized prospective attack-level collection supports the descriptive analysis. The intervention-only design, historical comparisons, and causal conclusion leave confounding and the counterfactual unresolved, producing a stacked methodological ceiling.
“The unit of analysis was the attack, data from the intervention group were analyzed.”
The Methods, Results, and tables make the care pathway and observed outcomes readily followable. Precision is reduced by the conclusion’s attribution of a reduction to the call center despite the explicitly non-causal design.
“no causal link could be demonstrated”
The Discussion compares findings with French and international HAE literature and acknowledges guideline-discordant tranexamic acid use. Its positioning is undermined because the causal and selection limitations are followed by conclusions that contradict their implications.
“which could lead to a potential source of inclusion bias with ‘over-performing’ HAE patients.”
Caveats4 of 4 checks
The descriptive counts generally reconcile, but the central comparative conclusion conflicts with the paper’s explicit statement that the ancillary design cannot demonstrate causality. A separate unexplained arithmetic statement in the Discussion does not affect the primary counts but reduces internal precision.
Ethics approval, trial registration, funding, author contributions, and absence of conflicts are declared. No conduct inconsistency or suspicious availability claim is identified in the supplied text.
Flags: 3 declared / 5 total
23 of 23 checkable references verified
23 references in manuscript
No retraction notice found in Retraction Watch.
Sources: Retraction Watch ✓
Where this paper’s evidence sits on the path from initial observation to real-world use.
The call-center pathway operated prospectively across eight French reference centers for two years, placing it in an operational rather than hypothetical setting. Deployment evidence remains incomplete because the report does not estimate comparative effectiveness.
“Patients from intervention centers were assigned to receive care management through national centralization of calls”
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