This clinical trial aims to test the effectiveness of ELLASI intervention in response time, deterioration score, and metabolic status of polytrauma patients in the emergency department. The main questions it aims to answer are:

1. Is the response time of polytrauma patients who receive ELLASI in the intervention group faster than the control group?
2. Is the deterioration score of polytrauma patients who receive ELLASI in the intervention group better than the control group?
3. Is the metabolic status of polytrauma patients who receive ELLASI in the intervention group better than the control group?

Polytrauma patients in the intervention group will receive ELLASI, a structured intervention consisting of the six following:

1. Evaluation of airway and cervical control, remove the foreign body, fluid, etc., from the airway,
2. Patient positioning and giving oxygen, head-up,
3. Stabilisation, including IV insertion, applying pressure and bandage, place monitor, and haemodynamic monitoring
4. Assessment: re-assessment of pain and other main complaints
5. Make sure informed consents are documented
6. Inform patient and family for further intervention

Polytrauma patients in the control group will receive the usual/standard intervention.

Response time, early warning score, and arterial blood gas of polytrauma patients from both groups will be obtained and documented before and after the intervention.

Inclusion Criteria:

• Polytrauma patients
• Have not received medical treatment before

Exclusion Criteria:

• Canceled registration
• Polytrauma patients who are unwilling to participate in the study

IPD will only be shared with supervisors for consultation. Due to privacy and anonymity, no participants' identifiers that will be disclosed