Please assess the completion status of the following clinical trial:

Trial Title: Dexamethasone and Respiratory Function After Mastectomy

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: PREVENTION
- Time Perspective: None
- Masking: TRIPLE
- Phase: PHASE3
- Number of Arms: 2.0

Eligibility Criteria:
Inclusion Criteria:~* confirmed diagnosis of breast carcinoma~Exclusion Criteria:~* patients with a classification of the American Society of Anesthesiologists classes III and IV.~* pregnancy~* during menstruation~* during steroid therapy~* severe diabetes mellitus (serum HbA1c\> 8%)~* opioids, sedatives or painkillers less than a week before the mastectomy~* history of alcohol or drugs~* patients with a history of inner ear disease and / or severe PONV after any surgical procedure performed in the past

- Gender: FEMALE
- Minimum Age: 20 Years
- Maximum Age: 69 Years
- Healthy Volunteers: f

Study Arms:
- dexamethasone group (Type: ACTIVE_COMPARATOR): patients receive one single dose of intravenous dexamethasone 8 mg.
- placebo group (Type: PLACEBO_COMPARATOR): patients receive one single dose of intravenous placebo.

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