Abstract
BackgroundEmergency medical service (EMS) data, particularly from the emergency department (ED), is a common source of information for syndromic surveillance. However, the entire EMS chain, consists of both out-of-hospital and in-hospital services. Differences in validity and timeliness across these data sources so far have not been studied. Neither have the differences in validity and timeliness of this data from different European countries. In this paper we examine the validity and timeliness of the entire chain of EMS data sources from three European regions for common syndromic influenza surveillance during the A(H1N1) influenza pandemic in 2009.MethodsWe gathered local, regional, or national information on influenza-like illness (ILI) or respiratory syndrome from an Austrian Emergency Medical Dispatch Service (EMD-AT), an Austrian and Belgian ambulance services (EP-AT, EP-BE) and from a Belgian and Spanish emergency department (ED-BE, ED-ES). We examined the timeliness of the EMS data in identifying the beginning of the autumn/winter wave of pandemic A(H1N1) influenza as compared to the reference data. Additionally, we determined the sensitivity and specificity of an aberration detection algorithm (Poisson CUSUM) in EMS data sources for detecting the autumn/winter wave of the A(H1N1) influenza pandemic.ResultsThe ED-ES data demonstrated the most favourable validity, followed by the ED-BE data. The beginning of the autumn/winter wave of pandemic A(H1N1) influenza was identified eight days in advance in ED-BE data. The EP data performed stronger in data sets for large catchment areas (EP-BE) and identified the beginning of the autumn/winter wave almost at the same time as the reference data (time lag +2 days). EMD data exhibited timely identification of the autumn/winter wave of A(H1N1) but demonstrated weak validity measures.ConclusionsIn this study ED data exhibited the most favourable performance in terms of validity and timeliness for syndromic influenza surveillance, along with EP data for large catchment areas. For the other data sources performance assessment delivered no clear results. The study shows that routinely collected data from EMS providers can augment and enhance public health surveillance of influenza by providing information during health crises in which such information must be both timely and readily obtainable.
Highlights
Emergency medical service (EMS) data, from the emergency department (ED), is a common source of information for syndromic surveillance
To evaluate the performance of a common syndromic influenza surveillance approach based on the emergency medical dispatch (EMD), Ambulance services staffed with emergency physician (EP) and ED data from different European regions during the autumn/winter wave of the A(H1N1) influenza pandemic, we focus on the validity components, sensitivity and specificity, as well as on timeliness measures as described by Buehler et al [21]
The baseline periods were used to determine the parameters of the Poisson cumulative sum (CUSUM) aberration detection algorithm
Summary
Emergency medical service (EMS) data, from the emergency department (ED), is a common source of information for syndromic surveillance. In this paper we examine the validity and timeliness of the entire chain of EMS data sources from three European regions for common syndromic influenza surveillance during the A(H1N1) influenza pandemic in 2009. Existing syndromic surveillance approaches apply indicator-based components, such as data from emergency departments [6,7], emergency medical dispatch centres [8,9], and telephone help lines [10,11]; as well as information on schoolabsenteeism [12,13] or over-the-counter drug sales of analgesics [14]. The data may be even broader, systems that apply event-based information use information from media sources or web queries related to influenza [15,16]
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