Please assess the completion status of the following clinical trial:

Trial Title: Theophylline for Low Adenosine Syncope

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

Eligibility Criteria:
Inclusion Criteria:~1. Male or female gender with age \>18 years~2. Unexplained syncope without prodrome or neurally-mediated syncope with atypical prodrome, with normal heart and normal ECG~3. Two syncopes /last year or 3 syncopes /last 2 years before start of theophylline treatment~4. Having received an ICM according to conventional guideline-based indications~5. Being treated with oral theophylline therapy, while been waiting for ICM diagnosis~6. Having signed a written informed consent to the study participation and to the treatment of personal data~Exclusion Criteria:~1. Typical vaso-vagal syncope with long prodromes and situational syncope~2. Any other form of syncope/T-LOC different from reflex syncope~3. Pregnant or breast-feeding patients -

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

Study Arms:
- Theophylline group (Type: None): Patients who have electrocardiographic documentation of asystolic syncope will be treated with oral theophylline at tailored dosage
- Control untreated group (Type: None): A propensity-score matched control group is generated from the large database of patients who had received an implantable loop recorder

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