Evidence map›Paper›PMID 38104083›Full record

ArticleScandinavian journal of trauma, resuscitation and emergency medicine2023

Trauma patient transport to hospital using helicopter emergency medical services or road ambulance in Sweden: a comparison of survival and prehospital time intervals.

Oscar Lapidus, Rebecka Rubenson Wahlin, Denise Bäckström

Erratum issuedOpen access · goldAbstract read
In one paragraph

Article in Scandinavian journal of trauma, resuscitation and emergency medicine, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. An erratum has been issued. Cited by 15 papers.

0numbers the graph read from it
0cells of the map it votes in
15citing papers in PubMed
8.0field-weighted citation impact, top 2% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

15 citing papers in PubMed, 23 citations in OpenAlex.

  1. Physician-staffed prehospital units for severely injured patients in the Stockholm trauma system - is there a survival benefit?European journal of trauma and emergency surgery : official publication of the European Trauma Society · 2026
    Article
  2. Article
  3. Helicopter emergency medical services for interfacility transfers: an Italian expert consensus.Scandinavian journal of trauma, resuscitation and emergency medicine · 2026
    Article
  4. Review
  5. Observational
  6. Article
  7. Article
  8. Factors associated with a positive shock index in the prehospital setting after major trauma.Scandinavian journal of trauma, resuscitation and emergency medicine · 2025
    Article
  9. Observational
  10. Article
  11. Article
  12. Article
  13. Article
  14. Article
  15. Article
4 · The record

Corrections and comments

5 · Who and what money

Authors and funding

3 authors at 3 institutions in 1 country.

Oscar LapidusDepartment of Clinical Science, Intervention and Technology, Karolinska Institutet, Stockholm, Sweden. oscar.lapidus@ki.se.ORCID http://orcid.org/0000-0003-4377-1262
Rebecka Rubenson WahlinDepartment of Clinical Science, Intervention and Technology, Karolinska Institutet, Stockholm, Sweden.ORCID http://orcid.org/0000-0003-3890-8236
Denise BäckströmDivision of Surgery, Orthopedics and Oncology, Department of Biomedical and Clinical Sciences, Linköping University, Linköping, Sweden.ORCID https://orcid.org/0000-0003-4075-4600
Karolinska Institutet · SEKarolinska University Hospital · SELinköping University · SE

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

backgroundThe benefits of helicopter emergency medical services (HEMS) transport of adults following major trauma have been examined with mixed results, with some studies reporting a survival benefit compared to regular emergency medical services (EMS). The benefit of HEMS in the context of the Swedish trauma system remains unclear.

aimTo investigate differences in survival and prehospital time intervals for trauma patients in Sweden transported by HEMS compared to road ambulance EMS.

methodsA total of 74,032 trauma patients treated during 2012-2022 were identified through the Swedish Trauma Registry (SweTrau). The primary outcome was 30-day mortality and Glasgow Outcome Score at discharge from hospital (to home or rehab); secondary outcomes were the proportion of severely injured patients who triggered a trauma team activation (TTA) on arrival to hospital and the proportion of severely injured patients with GCS ≤ 8 who were subject to prehospital endotracheal intubation.

results4529 out of 74,032 patients were transported by HEMS during the study period. HEMS patients had significantly lower mortality compared to patients transported by EMS at 1.9% vs 4.3% (ISS 9-15), 5.4% vs 9.4% (ISS 16-24) and 31% vs 42% (ISS ≥ 25) (p < 0.001). Transport by HEMS was also associated with worse neurological outcome at discharge from hospital, as well as a higher rate of in-hospital TTA for severely injured patients and higher rate of prehospital intubation for severely injured patients with GCS ≤ 8. Prehospital time intervals were significantly longer for HEMS patients compared to EMS across all injury severity groups.

conclusionTrauma patients transported to hospital by HEMS had significantly lower mortality compared to those transported by EMS, despite longer prehospital time intervals and greater injury severity. However, this survival benefit may have been at the expense of a higher degree of adverse neurological outcome. Increasing the availability of HEMS to include all regions should be considered as it may be the preferrable option for transport of severely injured trauma patients in Sweden.

Indexed as

Air AmbulancesEmergency Medical ServicesWounds and InjuriesAdultAircraftAmbulancesHospitalsHumansInjury Severity ScoreRetrospective StudiesSwedenEMSHEMSPrehospitalThe Swedish Trauma RegistryTransportTrauma

Identifiers

PMID38104083
PMCPMC10725597
OpenAlexW4389832126

What OpenQuestion holds

Textmetadata
LicenceCC BY
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.