Emergency Medical Dispatch CentreCAM-VISIONNCT05742412
Dispatch of Emergency Call Using Video Streaming Compared With Traditional Telephone Communication
A study testing Video streaming (smartphone camera) and Telephone (telephone microphone) in people with Emergency Medical Dispatch Centre and Video Streaming, run by Central Denmark Region at 1 site in Denmark.
Trial summary
In the Emergency Medical Dispatch Center, all EMS dispatchers were divided into one of two clusters with 11 EMS dispatchers in each cluster. Because of few clusters, a matched-pair (MP) design was used based on the average proportion of the dispatched level of urgency (highest level of urgency used as primary matching… Read more about this study
- Who is it for?
- Any age
- Conditions the study is for
- Emergency Medical Dispatch Centre, Video Streaming, Emergency Call
- What is being tested?
- Video streaming (smartphone camera) and Telephone (telephone microphone)
- Type of treatment
- Medical device
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 20,539 participants
- Where
- 1 siteDenmark
- Study dates
- 1 Jan 2023to 30 Apr 2023
- Phase
- Interventional
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages Any age
- All sexes
- No healthy volunteers
- Child, Adult, Older adult
Who may be able to join
- Emergency call to the EMS dispatcher in the EMDC
- EMS dispatcher employed in the total study period
- EMS dispatchers with a completed training period (6 weeks total) at the start of the study period
Who cannot join
- Emergency calls directed to an EMDC physician or technical logistical personnel not using the criteria-based dispatch tool
- non-emergency calls (health care provider requested prehospital transports)
- EMS dispatcher not employed in the total study period
- EMS dispatchers without a completed training period (6 weeks total) at the start of the study period
Trial locations and contacts
1 site in 1 country.
Denmark1 site
Prehospital Emegency Medical Service, Central Denmark Region, Denmark
Aarhus N, Central Jutland, 8200
About this study
Official title: Criteria-based Ambulance Management - Video Indexation VS Standard Indexation On Non-selected Emergency Calls
In the Emergency Medical Dispatch Center, all EMS dispatchers were divided into one of two clusters with 11 EMS dispatchers in each cluster. Because of few clusters, a matched-pair (MP) design was used based on the average proportion of the dispatched level of urgency (highest level of urgency used as primary matching criteria), years of employment and the average duration of emergency calls in a 3-months period (1st of January 2022 - 31st of March 2022) before the implementation of video streaming. Newly employed personnel where matching was not possible were randomly assigned to one of the two clusters. Prior to the study period, video streaming was gradually implemented in the intervention group during a 6-months period (1st of July 2022 - 31st of December 2022).
Using a cluster randomized setup, the aim was to investigate differences in the management of emergency calls (dispatches) when emergency medical service (EMS) dispatchers use video streaming compared with telephone-only (audio-only) communication. All emergency calls will be randomly distributed between the two clusters.
Read the detailed description
In Denmark, all emergency medical calls are answered by a nurse- or paramedic trained in dispatching emergencies. The EMS dispatcher determines the level of urgency and the type and number of resources to be allocated (e.g., ambulance, physician-manned vehicle and/or physician-manned helicopter (HEMS). The decision-making process is supported by a standardized national criteria-based dispatch tool called Danish Index for Emergency Care (DI). DI is a tool that classifies the patient's main complaint into different symptom groups (chapters) to determine the level of urgency required and which resources to allocate.
As standard, emergency calls are based on telephone-only (audio-only) communication, which might limit the understanding of a complex clinical presentation.
Previous studies suggest that a visualized clinical presentation could aid the EMS dispatchers in their decision-making and dispatch.
The decision on implementing video streaming has been made by the management board of the Prehospital Emergency Medical Services, Central Denmark Region, Denmark. It has been decided to implement video streaming gradually to allow for this cluster randomized study. Because video streaming is a deemed part of the standard operating procedure (SOP), ethical approval from our local ethical committee is waived. After the study period, video streaming will be implemented in the current control group as the decision to use video streaming as SOP has already been decided.
- Conditions
- Emergency Medical Dispatch Centre, Video Streaming, Emergency Call, Prehospital Emergency Medical Services
- Being tested
- Video streaming (smartphone camera), Telephone (telephone microphone)
- Keywords
- Emergency Medical Services, Emergency Medical Service Communication Systems, Audiovisual aid
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Video streaming (smartphone camera)Device
Adding video streaming as a technical adjunct to the otherwise audio-based-only communication during emergency medical dispatch
Telephone (telephone microphone)Device
Usual care: Audio-based-only communication using telephone during emergency medical dispatch
| Study group | Role | What they receive |
|---|---|---|
| Intervention Group | Experimental | Intervention group: EMS dispatcher using video-based communication in emergency calls.
In the intervention arm, the EMS Dispatchers are requested to use video in all emergency calls during the 4-month study period. Receives: Device: Video streaming (smartphone camera) |
| Control Group | Active comparator | Control group: EMS dispatcher using telephone-only (audio-only) communication in emergency calls.
In the control arm, the EMS Dispatchers continue using standard telephone communication (usual care). Receives: Device: Telephone (telephone microphone) |
What is being measured
The primary outcome is the main question the study is designed to answer.
The frequency of dispatches with the highest level of urgency (A-responses)
Defined by the dispatch code generated by the computer-aided dispatch software Logis and stored in the EMDC database
Measured: Continuously stored during the study period (4 months). Data collection from study termination.
Secondary outcomes (11)
The frequency of dispatches with the levels of urgency A, B, C, D and E
Defined by the dispatch code generated by the computer-aided dispatch software Logis and stored in the EMDC database graded in 5 levels.
Measured: Continuously stored during the study period (4 months). Data collection from study termination.
Mortality, 30-day
Mortality within 30 days after study inclusion
Measured: Data collection 30 days after study termination (31st of May 2023)
Number of participants where the levels of urgency are identical when comparing the ambulance to and from the scene
The number and proportion of participant where the level of urgency dispatched by the EMS dispatcher (determining the speed of the ambulance transport to the scene) is identical to the level of urgency determined by the EMS provider (determining the speed of the ambulance transport to hospital).
Measured: Continuously stored during the study period (4 months). Data collection from study termination.
Length of stay at hospital
Time from initial hospital admission to hospital discharge to home or care facility
Measured: Data collection 90 days after study termination or until last patient discharged or dead
The number of participants needing an ICU admission at hospital
Number and proportion of patients needing ICU admission during hospital stay
Measured: Continuously stored during the study period (4 months). Data collection from study termination.
Number of emergency calls where the dispatched level of urgency is changed during the call
Number and proportion of emergency medical calls, where the EMS dispatcher change the level of urgency during the emergency medical call.
Measured: Continuously stored during the study period (4 months). Data collection from study termination.
Number of emergency calls where the allocated resources is changed during the call
Change in allocated resources (e.g., number of ambulances, helicopter, physician manned vehicles etc.) during the emergency call compared with the initially allocated resources.
Measured: Continuously stored during the study period (4 months). Data collection from study termination.
Number of participants readmitted to hospital within 24 hours after a dispatch without hospital admission (lowest level of urgency - response level E)
The number and rate of readmission to hospital within 24 hours among emergency medical calls dispatched at lowest level of urgency (response level E) without allocated prehospital resources (patients only provided with an advice from the EMS dispatcher).
Measured: 24-hours after study termination
Duration of emergency medical calls
The duration of the total call time in minutes.
Measured: Continuously stored during the study period (4 months). Data collection from study termination.
Time from emergency call to dispatch
Time (in minutes) from the start of the emergency medical call to the dispatch (allocated resources with a level of urgency) by EMS dispatcher.
Measured: Continuously stored during the study period (4 months). Data collection from study termination.
On-scene time
Time (in minutes) from EMS provider arrival at scene to departure with the patient.
Measured: Continuously stored during the study period (4 months). Data collection from study termination.
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted24 Feb 2023
- Study start1 Jan 2023
- Primary completion30 Apr 2023
- Study completion30 Apr 2023
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (3)Papers the sponsor has linked to this study.
- Other trials for Emergency Medical Dispatch CentreStudies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase N/A
- Primary purpose
- Diagnosis
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Model description
- Cluster Randomised Clinical Trials
- Masking
- Single blind
- Who is masked
- Participant
- Enrolment
- 20,539 participants (actual)
Sponsor and investigators
- Lead sponsor
- Central Denmark Region
- Sponsor type
- University, hospital or other
- Responsible party
- Sponsor
- Investigators
- Martin F Gude, MD, Principal investigator, Prehospital Emergency Medical Service, Central Denmark Region, Denmark
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT05742412
- Sponsor's protocol ID
- 3436
- Acronym
- CAM-VISION
- Status last verified
- Aug 2023
- First submitted
- 13 Jan 2023
- Last updated
- 30 Aug 2023
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
Publications
Sohoel JE, Gehrt TB, Bohnstedt-Pedersen NH, Dalgaard AK, Vaeggemose U, Gude MF. Can video reduce conflict between dispatcher and caller during emergency medical calls? A randomized substudy of the CAM-VISION trial. J Telemed Telecare. 2026 Apr 7:1357633X261435246. doi: 10.1177/1357633X261435246. Online ahead of print.
PubMed 41944280Bohnstedt-Pedersen NH, Gehrt TB, Blauenfeldt RA, Vaeggemose U, Gude MF. Video-assisted versus telephone-only pediatric emergency calls: a predefined substudy of the cluster randomized CAM-VISION trial. Scand J Trauma Resusc Emerg Med. 2026 Mar 26;34(1):85. doi: 10.1186/s13049-026-01602-8.
PubMed 41888824Gude MF, Valentin JB, Meisner-Jensen M, Bohnstedt-Pedersen NH, Dalgaard AK, Vaeggemose U, Blauenfeldt RA. Video Streaming or Telephone Communication During Emergency Medical Services Dispatch Calls: A Cluster Randomized Clinical Trial. JAMA Netw Open. 2025 Jul 1;8(7):e2519020. doi: 10.1001/jamanetworkopen.2025.19020.
PubMed 40591356
Study at a glance
From the registry record, last updated by the sponsor on 30 Aug 2023. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Criteria-based Ambulance Management - Video Indexation VS Standard Indexation On Non-selected Emergency Calls
- ClinicalTrials.gov ID
- NCT05742412
- Acronym / sponsor ID
- CAM-VISION / 3436
- Conditions
- Emergency Medical Dispatch Centre, Video Streaming, Emergency Call, Prehospital Emergency Medical Services
- Keywords
- Emergency Medical Services, Emergency Medical Service Communication Systems, Audiovisual aid
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 20,539 participants (actual)
- Lead sponsor
- Central Denmark RegionUniversity, hospital or other
- Study start
- 1 Jan 2023 (actual)
- Primary completion
- 30 Apr 2023 (actual)
- Study completion
- 30 Apr 2023 (actual)
- First posted
- 24 Feb 2023 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
In the Emergency Medical Dispatch Center, all EMS dispatchers were divided into one of two clusters with 11 EMS dispatchers in each cluster. Because of few clusters, a matched-pair (MP) design was used based on the average proportion of the dispatched level of urgency (highest level of urgency used as primary matching criteria), years of employment and the average duration of emergency calls in a 3-months period (1st of January 2022 - 31st of March 2022) before the implementation of video streaming. Newly employed personnel where matching was not possible were randomly assigned to one of the two clusters. Prior to the study period, video streaming was gradually implemented in the intervention group during a 6-months period (1st of July 2022 - 31st of December 2022).
Using a cluster randomized setup, the aim was to investigate differences in the management of emergency calls (dispatches) when emergency medical service (EMS) dispatchers use video streaming compared with telephone-only (audio-only) communication. All emergency calls will be randomly distributed between the two clusters.
Detailed description
In Denmark, all emergency medical calls are answered by a nurse- or paramedic trained in dispatching emergencies. The EMS dispatcher determines the level of urgency and the type and number of resources to be allocated (e.g., ambulance, physician-manned vehicle and/or physician-manned helicopter (HEMS). The decision-making process is supported by a standardized national criteria-based dispatch tool called Danish Index for Emergency Care (DI). DI is a tool that classifies the patient's main complaint into different symptom groups (chapters) to determine the level of urgency required and which resources to allocate.
As standard, emergency calls are based on telephone-only (audio-only) communication, which might limit the understanding of a complex clinical presentation.
Previous studies suggest that a visualized clinical presentation could aid the EMS dispatchers in their decision-making and dispatch.
The decision on implementing video streaming has been made by the management board of the Prehospital Emergency Medical Services, Central Denmark Region, Denmark. It has been decided to implement video streaming gradually to allow for this cluster randomized study. Because video streaming is a deemed part of the standard operating procedure (SOP), ethical approval from our local ethical committee is waived. After the study period, video streaming will be implemented in the current control group as the decision to use video streaming as SOP has already been decided.
Study design
- Primary purpose
- Diagnosis
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Single blind (participant)
- Number of arms
- 2
- Model description
- Cluster Randomised Clinical Trials
| Arm | Type | Receives |
|---|---|---|
| Intervention Group | Experimental | Device: Video streaming (smartphone camera)Intervention group: EMS dispatcher using video-based communication in emergency calls. In the intervention arm, the EMS Dispatchers are requested to use video in all emergency calls during the 4-month study period. |
| Control Group | Active comparator | Device: Telephone (telephone microphone)Control group: EMS dispatcher using telephone-only (audio-only) communication in emergency calls. In the control arm, the EMS Dispatchers continue using standard telephone communication (usual care). |
Who may qualify
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Child, Adult, Older adult
Key inclusion criteria (3 listed)
- Emergency call to the EMS dispatcher in the EMDC
- EMS dispatcher employed in the total study period
- EMS dispatchers with a completed training period (6 weeks total) at the start of the study period
Key exclusion criteria (4 listed)
- Emergency calls directed to an EMDC physician or technical logistical personnel not using the criteria-based dispatch tool
- non-emergency calls (health care provider requested prehospital transports)
- EMS dispatcher not employed in the total study period
- EMS dispatchers without a completed training period (6 weeks total) at the start of the study period
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| Video streaming (smartphone camera)Adding video streaming as a technical adjunct to the otherwise audio-based-only communication during emergency medical dispatch | Device | Intervention Group |
| Telephone (telephone microphone)Usual care: Audio-based-only communication using telephone during emergency medical dispatch | Device | Control Group |
Primary outcome
The frequency of dispatches with the highest level of urgency (A-responses)
Time frame: Continuously stored during the study period (4 months). Data collection from study termination.
Defined by the dispatch code generated by the computer-aided dispatch software Logis and stored in the EMDC database
11 secondary outcomes
The frequency of dispatches with the levels of urgency A, B, C, D and E
Time frame: Continuously stored during the study period (4 months). Data collection from study termination.
Mortality, 30-day
Time frame: Data collection 30 days after study termination (31st of May 2023)
Number of participants where the levels of urgency are identical when comparing the ambulance to and from the scene
Time frame: Continuously stored during the study period (4 months). Data collection from study termination.
Length of stay at hospital
Time frame: Data collection 90 days after study termination or until last patient discharged or dead
The number of participants needing an ICU admission at hospital
Time frame: Continuously stored during the study period (4 months). Data collection from study termination.
Number of emergency calls where the dispatched level of urgency is changed during the call
Time frame: Continuously stored during the study period (4 months). Data collection from study termination.
Number of emergency calls where the allocated resources is changed during the call
Time frame: Continuously stored during the study period (4 months). Data collection from study termination.
Number of participants readmitted to hospital within 24 hours after a dispatch without hospital admission (lowest level of urgency - response level E)
Time frame: 24-hours after study termination
Duration of emergency medical calls
Time frame: Continuously stored during the study period (4 months). Data collection from study termination.
Time from emergency call to dispatch
Time frame: Continuously stored during the study period (4 months). Data collection from study termination.
On-scene time
Time frame: Continuously stored during the study period (4 months). Data collection from study termination.
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 30 Aug 2023.
- Derived from this study: PubMed 41944280Sohoel JE, Gehrt TB, Bohnstedt-Pedersen NH, Dalgaard AK, Vaeggemose U, Gude MF. Can video reduce conflict between dispatcher and caller during emergency medical calls? A randomized substudy of the CAM-VISION trial. J Telemed Telecare. 2026 Apr 7:1357633X261435246. doi: 10.1177/1357633X261435246. Online ahead of print.
- Derived from this study: PubMed 41888824Bohnstedt-Pedersen NH, Gehrt TB, Blauenfeldt RA, Vaeggemose U, Gude MF. Video-assisted versus telephone-only pediatric emergency calls: a predefined substudy of the cluster randomized CAM-VISION trial. Scand J Trauma Resusc Emerg Med. 2026 Mar 26;34(1):85. doi: 10.1186/s13049-026-01602-8.
- Derived from this study: PubMed 40591356Gude MF, Valentin JB, Meisner-Jensen M, Bohnstedt-Pedersen NH, Dalgaard AK, Vaeggemose U, Blauenfeldt RA. Video Streaming or Telephone Communication During Emergency Medical Services Dispatch Calls: A Cluster Randomized Clinical Trial. JAMA Netw Open. 2025 Jul 1;8(7):e2519020. doi: 10.1001/jamanetworkopen.2025.19020.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
Martin F Gude, MD principal investigator
Prehospital Emergency Medical Service, Central Denmark Region, Denmark
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A study testing Video streaming (smartphone camera) and Telephone (telephone microphone) in people with Emergency Medical Dispatch Centre and Video Streaming, run by Central Denmark Region at 1 site in Denmark.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 3 inclusion and 4 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 30 Aug 2023. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in Denmark. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
The frequency of dispatches with the highest level of urgency (A-responses) (time frame: Continuously stored during the study period (4 months). Data collection from study termination.). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
On the ClinicalTrials.gov record for NCT05742412, which also lists 3 linked publications.
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 30 Aug 2023.