Please assess the completion status of the following clinical trial:

Trial Title: Determination of ED90 of Intrathecal Lidocaine for Adequate Anesthesia for Elective Cervical Cerclage Surgery

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

Eligibility Criteria:
Inclusion Criteria:~* Any patient who is at least 18 years old~* ASA physical class I or II~* BMI \<40 kg/m2,~* Presents for elective cervical cerclage during their first or second trimester of pregnancy will be eligible to participate.~Exclusion Criteria:~* Any patient who is not a candidate for neuraxial anesthesia (including coagulopathy,~* Local skin infection, uncorrected hypovolemia)~* Allergy to lidocaine or fentanyl~* Chronic opioid user~* History of failed neuraxial anesthesia or analgesia,~* Had prior spine surgery~* Can not assume a sitting position for spinal anesthesia due to risk of amniotic membrane rupture

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

Study Arms:
- Spinal Lidocaine Administration (Type: EXPERIMENTAL): Spinal anesthesia will be induced with isobaric 2% lidocaine and 15 μg fentanyl.~The study lidocaine dose will be determined using a 9:1 biased-coin sequential allocation method. For the first participant, the starting dose will be 32 mg of 2% isobaric lidocaine (1.6 mL). If the lidocaine dose provides an unsatisfactory anesthetic, the case will be categorized as a failure. After a failed case, the next participant will receive a lidocaine dose increased by 4 mg. If the lidocaine dose provides satisfactory anesthesia, the next participant's lidocaine dose will determined by a biased allocation method with a 90% chance of maintaining the dose and a 10% chance of decreasing the dose by 4 mg.

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