Analysis of Helicopter Emergency Medical Services Metrics-Altmetrics Score Perspective: HEMS-MAP

Helicopter emergency medical services (HEMS) provide time-sensitive transport and advanced prehospital care. Although traditional bibliometrics (eg, citation counts) have measured academic impact, the role of alternative metrics (altmetrics), such as social media and news mentions, in capturing real-time scholarly influence remains underexplored in HEMS research. To evaluate the relationship between traditional citation metrics and altmetric indicators in HEMS-related publications and to identify trends in online engagement and academic dissemination.

This cross-sectional analysis included 817 HEMS-related articles published between 1984 and 2025, identified using Altmetric Explorer. Data were extracted from Altmetric Explorer, PlumX Metrics, and Springer Nature Citations, covering various traditional and alternative impact indicators. Descriptive statistics summarized citation and altmetric indicators. Spearman's correlation analysis assessed relationships between Altmetric Attention Score (AAS), Mendeley readership, and citation counts from multiple sources (Dimensions, CrossRef, Scopus, PubMed). Geographic and temporal engagement patterns were also evaluated.

The mean AAS was 11.18 ± 28.80, and the mean citation count (Dimensions) was 17.04 ± 24.48. A strong positive correlation was found between AAS and X (formerly Twitter) mentions (ρ = 0.723, P < .001). Mendeley readers had strong positive correlations with citation counts. However, overall correlations between AAS and citation counts were weak. Social media engagement was highest in the United Kingdom and the United States. Nordic countries dominated policy and guideline citations.

This is the first comprehensive altmetric analysis of HEMS-related publications. Although AAS reflects online attention, it correlates only modestly with traditional academic impact. Altmetrics offer complementary insight into research dissemination, especially in the digital age, and may inform more holistic evaluation strategies in prehospital and emergency medicine scholarship.