Please assess the completion status of the following clinical trial:

Trial Title: Cerebral Blood Flow Evaluation With Trancranial Doppler After Interscalene Nerve Block

Study Design Characteristics:
- Allocation: None
- Intervention Model: None
- Observational Model: COHORT
- Primary Purpose: None
- Time Perspective: PROSPECTIVE
- Masking: None
- Phase: None
- Number of Arms: None

Eligibility Criteria:
Inclusion Criteria:~* Patients undergoing orthopedic surgery and with an indication for preoperative insertion of interscalene nerve block~* 18-85 years old~* Give consent to participate in study~Exclusion Criteria:~* Cannot give consent~* Patients who are clinically unstable or require urgent/emergent intervention

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

Study Arms:
- Treatment Arm (Type: None): Patients ages 18-85 years old presenting with orthopedic shoulder surgery with indication to receive preoperative insertion of interscalene nerve block.

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