Please assess the completion status of the following clinical trial:

Trial Title: Nitrous Oxide Analgesia Vaso-occlusive Crisis

Study Design Characteristics:
- Allocation: None
- Intervention Model: SINGLE_GROUP
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: NONE
- Phase: PHASE2
- Number of Arms: 1.0

Eligibility Criteria:
Inclusion Criteria:~* Patients with sickle cell disease~* Ages 8 to 18, inclusive~* Present to the pediatric emergency department with VOC and whose pain scores remain greater than or equal to 7/10 on the NRS after initial standard treatment (i.e. IV fluids, morphine and NSAIDs).~Exclusion Criteria:~* life-threatening illness as determined by attending clinician~* developmental delay~* altered level of consciousness~* any contraindications to receiving N2O~* foster children and wards of the state

- Gender: ALL
- Minimum Age: 8 Years
- Maximum Age: 18 Years
- Healthy Volunteers: f

Study Arms:
- Nitrous oxide 50% (Type: EXPERIMENTAL): Nitrous oxide 50% administered for 20 minutes.

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