Validation of the HAR Score for Prioritization of Patients Calling the Emergency Medical Service for Chest Pain by Emergency Call Dispatcher

Not yet recruiting

• Conditions: Chest Pain

• Registration Number: NCT06859021
• Lead Sponsor: Centre Hospitalier le Mans

Brief Summary

The lifetime prevalence of chest pain in the general population is 20-40%. The etiologies to be evoked from the outset of management are those of cardiovascular origin, such as acute coronary syndrome (ACS) and pulmonary embolism. ACS is responsible for almost 20% of deaths. Delay in treatment is a major prognostic factor, given the importance of coronary reperfusion.

In France, one of the first contacts with the healthcare system is the medical regulation assistant (MRA) at the Centre 15. His or her role is to prioritize the call according to the identification of immediate signs of seriousness, and if necessary, to decide autonomously to send a rescue team before medical regulation. Depending on the reason for the call and any signs of seriousness, it prioritizes the call according to the expected response time. In line with current recommendations, all calls for chest pain should be answered by an emergency medical dispatcher (EMR) within 5 minutes. However, 60-90% of chest pain calls are not of cardiovascular origin. Their prioritization could therefore be re-qualified for longer response times.

Given the frequency of this type of call, a more efficient MRA referral strategy is needed. To achieve this, decision-support tools would be essential.

The performance of the HAR (History, Age and Risk Factors) score has been recently explored, derived from the HEART score, in a previous single-center prospective study in 2019. It stratifies the risk of a major cardiovascular event (MCE) into low (0 or 1 point), intermediate (2 or 3 points) or high (4, 5 or 6 points).

Investigator's hypothesis is that the HAR score could be entrusted to MRA, to enable them to optimize the prioritization of patients calling with non-traumatic chest pain, by qualifying low-risk chest pain calls on the one hand, which could be prioritized in P2 SNP, and high-risk calls on the other, making it possible to anticipate the dispatch of an emergency service.

Detailed Description

Not available

Study Timeline

• Study First Submitted: 2025-02-28
• Study First Submitted QC: 2025-02-28
• Status Verified: 2025-03
• Study First Posted: 2025-03-05
• Last Update Submitted: 2025-03-19
• Last Update Posted: 2025-03-24
• Study Start: 2025-05-02
• Primary Completion: 2025-12
• Study Completion: 2025-12

Recruitment & Eligibility

• Status: NOT_YET_RECRUITING
• Sex: All
• Target Recruitment: 796

Inclusion Criteria

• Patient of legal age (≥ 18 years)
• Calling Center 15 from 49, 72 or 37
• Expressing non-traumatic chest pain, even if this is not the main reason for seeking help.

Exclusion Criteria

• Treatment in departments other than 49, 72 and 37
• Taken in charge in an emergency department of a private facility in the 49, 72 and 37 départements
• Poor understanding of the French language
• Non-affiliated or non-beneficiary of a social security scheme
• Person deprived of liberty by judicial or administrative decision
• Person under forced psychiatric care
• Person subject to a legal protection measure
• Person unable to express his/her non-opposition.
• Follow-up at Day 30 impossible for any reason
• Person having expressed his/her opposition to the collection of his/her data.

Study & Design

• Study Type: OBSERVATIONAL
• Study Design: Not specified

Primary Outcome Measures

Name	Time	Method
Number of major cardiovascular events	30 days	Number of major cardiovascular events is measured by presence of Death from cardiological causes, Type 1 or 2 myocardial infarction, Percutaneous coronary intervention, Surgical coronary bypass surgery

Secondary Outcome Measures

Name	Time	Method
Performance of the HAR Score: Sensitivity, Specificity, and Comparison Between EMR and MRA	From Day 0 to Day 30	Sensitivity, specificity, likelihood ratios of the HAR score at different decision thresholds and the area under the ROC curve, as well as reclassification rates between the evaluation of the HAR score by the EMR (Emergency Medical Dispatcher) and the MRA (Medical Regulation Assistant)
Comparaison between rescue resources decided and predicted by the HAR score	From Day 0 to Day 30	The proportion of rescue resources (SMUR - VSAV...) that would have been decided according to the HAR score (≥ 4 points) compared to the proportion of rescue resources actually decided upon
Time delta between the end of the MRA's score suggesting the dispatch of equipment (HAR score ≥ 4 points) and the actual decision to dispatch equipment in the current situation.	From Day 0 to Day 30
Area under the ROC curve and Delong-Delong test	From Day 0 to Day 30

Trial Locations

Locations (3)

Centre Hospitalier Universitaire d'Angers; 🇫🇷 Angers, France

Centre Hospitalier Le Mans; 🇫🇷 Le Mans, France

CHRU de Tours; 🇫🇷 Tours, France