Table 2 Final patient variables

Number

Data variable name

Type of data

Data variable categories or values

Choose only one option unless otherwise stated.

Definition of data variable

4

Age

Continuous

YY

Years rounded down. Ages under 1 year are reported in decimals (e.g. 6 months = 0.5 year)

5

Gender

Nominal

1 = Female

2 = Male

3 = Other / Unknown

Patient gender

6

Patient category

Nominal

1 = Trauma - Blunt

2 = Trauma – Penetrating

3 = Trauma - Head injury (including TBI)

4 = Trauma - Other (including burns, strangulation, drowning, or asphyxiation)

5 = Medical - Cardiac arrest

6 = Medical - Respiratory distress or breathing difficulties

7 = Medical – Intoxication

8 = Medical - Infection (including sepsis)

9 = Medical - Other (e.g. endocrinology or other medical emergencies)

10 = Neurology - Stroke (including cerebral haemorrhage or infarction)

11 = Neurology - Other (excluding stroke)

12 = Psychiatry (e.g. agitation/psychosis)

13 = Obstetrics

14 = Other emergencies, describe: ______

15 = Unknown

Dominating reason for emergency treatment

TBI = Traumatic Brain Injury

7

Indication for airway intervention

Nominal

1 = Decreased level of consciousness

2 = Hypoxemia

3 = Ineffective ventilation

4 = Existing airway obstruction

5 = Impending airway obstruction

6 = Combative or uncooperative

7 = Humanitarian (e.g. relief of pain or distress)

8 = Cardiac arrest

9 = Pre-existing airway device (e.g. SAD) not working adequately

10 = Other, describe: ____________

Indications for airway intervention.

Select all that apply.

8

Patient risk factors for difficult intubation

Nominal

1 = No risk factors for difficult intubation

2 = Prior difficult intubation

3 = Reduced neck mobility, neck-immobilization device or manual in-line stabilisation (MILS)

4 = Severe obesity or thick/short neck

5 = Limited mouth opening or inter incisor distance < 4 cm

6 = Short Thyroid-Mental-Distance (< 6.5 cm)

7 = Significant maxillofacial or upper airway trauma

8 = Blood, vomit, mucus or hypersalivation in airways

9 = Pre-existing airway device (e.g. SAD) not working adequately

10 = Other, describe: ______

11 = Risk factors not assessed.

Airway assessment before or during intervention showing patient risk factors for difficult intubation, e.g. poor visualisation, foreign body, blood or saliva.

SAD = Supraglottic airway device

Select all that apply.

9

Aggravating conditions for airway management

Nominal

1 = Patient entrapped during airway management

2 = Not 360-degree access to patient during airway management

3 = Suboptimal provider positioning

4 = Bright light/sunlight

5 = Darkness

6 = Hostile environment

7 = In moving helicopter/ambulance

8 = In stationary helicopter/ambulance

9 = Other, describe: ____

Patient entrapped means physically restrained in wreckage, etc.

Not 360-degree access means restricted access for providers to all parts of patient, e.g. cannot move freely around patient or patient cannot be positioned on half-high stretcher for intubation.

Suboptimal provider positioning means suboptimal intubating positioning, e.g. patient flat on ground during CPR with provider kneeling low or lying.

Hostile environment means environment containing physical, chemical, biological, radioactive or other threats to provider safety (e.g. “active shooter” scenario).

Select all that apply.

10

Respiratory rate, initial

Continuous and Nominal

1 = Number, describe

2 = NA: Did not measure

3 = NA: Could not measure

Initial value (Baseline) recorded on scene.

NA = Not available

11

Blood pressure, initial

Continuous and Nominal

1 = Number, describe (Syst-BP/Dias-BP (MAP))

2 = NA: Did not measure

3 = NA: Could not measure

Initial value (Baseline) recorded on scene.

NA = Not available

12

SpO₂, initial

Continuous and Nominal

1 = Number, describe

2 = NA: Did not measure

3 = NA: Could not measure

Initial value (Baseline) recorded on scene.

NA = Not available

13

Blood pressure, lowest prior to airway management

Continuous and Nominal

1 = Number, describe (Syst-BP/Dias-BP (MAP))

2 = NA: Did not measure

3 = NA: Could not measure

Lowest value prior to airway management recorded on scene.

NA = Not available

14

SpO₂, lowest prior to airway management

Continuous and Nominal

1 = Number, describe

2 = NA: Did not measure

3 = NA: Could not measure

Lowest value prior to airway management recorded on scene.

NA = Not available

15

Blood pressure, lowest during airway management

Continuous and Nominal

1 = Number, describe (Syst-BP/Dias-BP (MAP))

2 = NA: Did not measure

3 = NA: Could not measure

Lowest value during airway management recorded on scene.

NA = Not available

16

SpO₂, lowest during airway management

Continuous and Nominal

1 = Number, describe

2 = NA: Did not measure

3 = NA: Could not measure

Lowest value during airway management recorded on scene.

NA = Not available

17

Glasgow Coma Score (GCS), initial

Continuous and Nominal

1 = Sum GCS (Motor + Verbal + Eyes)

2 = NA

Initial value (Baseline) recorded on scene.

NA = Not available

18

Glasgow Coma Score (GCS), lowest prior to airway management

Continuous and Nominal

1 = Sum GCS (Motor + Verbal + Eyes)

2 = NA

Lowest value prior to airway management recorded on scene.

NA = Not available