Please assess the completion status of the following clinical trial:

Trial Title: Ventilation Strategies, Anesthetic Techniques and Cerebral Oxygenation in the Beach Chair Position

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

Eligibility Criteria:
Inclusion Criteria:~* scheduled for elective arthroscopic shoulder surgery in the beach chair position under general anesthesia with supplemental interscalene block~Exclusion Criteria:~* refusal to give consent~* ineligible for interscalene block~* history of cardiovascular disease~* history of cerebrovascular disease~* hypertension~* respiratory failure~* non-English speaker

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: 85 Years
- Healthy Volunteers: f

Study Arms:
- Desflurane (Type: EXPERIMENTAL): Patients will receive general anesthesia with desflurane. Both arms have rSO2 measured and undergo identical changes in ventilation strategy.
- Propofol (Type: EXPERIMENTAL): Patients will receive total intravenous general anesthesia (TIVA) with propofol. Both have rSO2 measured and undergo identical changes in ventilation strategy.

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