Please assess the completion status of the following clinical trial:

Trial Title: Efficacy of Premixed Nitrous Oxide and Oxygen in Elderly Patient With Out-of-hospital Severe Acute Pain

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: DOUBLE
- Phase: PHASE2/PHASE3
- Number of Arms: 2.0

Eligibility Criteria:
Inclusion Criteria:~* Patients aged 65 years old and over~* Severe acute pain (NRS score greater than 6)~Exclusion Criteria:~* Contraindication of premixed 50% nitrous oxide and oxygen

- Gender: ALL
- Minimum Age: 65 Years
- Maximum Age: 100 Years
- Healthy Volunteers: f

Study Arms:
- Premixed 50% nitrous oxide and oxygen (Type: ACTIVE_COMPARATOR): The patient will be taken care by the physician SMUR or home emergency. Upon acceptance of participation in the study, the clock will be started at the time of the establishment of the face mask. Premixed 50% nitrous oxide and oxygen is administered for 30 minutes and an opioid titration is started 10 minutes after the introduction of gas, unless the patient expresses pain score EN \<3/10.
- Medical air (Type: PLACEBO_COMPARATOR): The patient will be taken care by the physician SMUR or home emergency. Upon acceptance of participation in the study, the clock will be started at the time of the establishment of the face mask. The medical air is administered for 30 minutes and an opioid titration is started 10 minutes after the introduction of gas, unless the patient expresses pain score EN \<3/10.

Based on this trial design, predict the completion outcome and termination type (if applicable).