Please assess the completion status of the following clinical trial:

Trial Title: Ultrasound-guided Intermediate Cervical Plexus Block

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

Eligibility Criteria:
Inclusion Criteria:~* internal carotid stenosis: open surgical revascularization~* age over 18 years~* written informed consent~Exclusion Criteria:~* allergy (local anesthetics)~* pregnancy~* participation in other studies~* drug addiction~* non-cooperative patients

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: None
- Healthy Volunteers: f

Study Arms:
- with perivascular block (Type: EXPERIMENTAL): 1. ultrasound-guided intermediate cervical plexus block (20ml ropivacaine 0.75%) 2. facial nerve block (cervical branch) (5ml prilocaine 1%) 3. perivascular block (5ml prilocaine 1%)
- without perivascular block (Type: EXPERIMENTAL): 1. ultrasound-guided intermediate cervical plexus block (20ml ropivacaine 0.75%) 2. facial nerve block (cervical branch) (5ml prilocaine 1%)

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