Table 2 Operational and medical variables, including content and completeness of each variable in Hemsfile
From: The Danish helicopter emergency medical service database: high quality data with great potential
| Variable | Content | Completeness (%) |
|---|---|---|
| Operational | ||
| Hems ID | Unique number for identification of the event | 100 |
| Type of mission | Four separate report forms (patient treated and carried (RF1), patient attended to, but not carried (RF2), aborted missions (RF3), rejected missions (RF4)) and a telephone registration | 100 |
| HEMS base | Location of HEMS unit (Skive, Billund, Ringsted) | 100 |
| Crew | ||
| Physician | Name of physician on call | 100 |
| Paramedic | Name of paramedic on call | 98.6 |
| Pilot | Name of pilot on call | 98.6 |
| Dispatching region | One of the five Danish regions (Capital Region, Region of Zealand, Central Denmark Region, Northern Region, Southern Region) | 100 |
| Date | Date of event | 100 |
| Timestamps | ||
| Time of alarm | Defined as time of dispatch | 100 |
| Airborne | Defined as time of leaving the helipad at the base | 97.6 |
| Arrival on-scene | Defined as time of arrival on scene | 99.9 |
| Departure from the scene | Defined as time of helicopter take-off from the scene | 99.0 |
| Arrival at hospital | Defined as time of arrival at hospital | 85.1 |
| Patient management | Thirteen options (presented in Table 3) | 100 |
| Destination | Receiving university or regional hospital | 100a |
| Island | Mission to an island not connected to the mainland (yes/no) | 89.1b |
| Reason for aborted mission | Eight options (landing impossible, cancelled by RRV staff, cancelled by EMDC staff, cancelled by ambulance staff, redirected, weather, technic or other) | 99.5 |
| Reason for rejected mission | Eight options (duty-time, no need, no time gain, landing impossible, weather, concurrency, technic or other) | 99.7 |
| Medical | ||
| Civil registry number | Unique 10-digit personal identifier | 93.6c |
| NACA score | Used to assess the severity of illness/injury. Score ranges from 0 to 7 | 99.9 |
| ICD-10 |
Pre-hospital diagnosis based on the International Classification of Diseases, 10th edition | 99.8 |
| Interventions | ||
| Airway management | Three options (yes intubation by HEMS physician, yes intubation by RRV physician or no) | 99.2 |
| Ultrasound examination | Ultrasound examination by HEMS physician (yes/no) | 98.2 |
| Mechanical CPR (LUCAS) | Five options (yes at the scene, yes at the scene and during transfer, yes at the scene but not during transfer, yes stand-by during transfer or no) | 96.2 |
| Intraosseous access | Intraosseous access by HEMS physician (yes/no) | 97.7 |
| Thoracic intervention | Four options (yes thoracotomy, yes chest tube placement, yes thoracostomy or no) | 95.8 |
| Blood products | Red blood cells or plasma administered by HEMS physician (yes/no) | 98,0 |