Please assess the completion status of the following clinical trial:

Trial Title: Optimal Sensing in Atrial Tachyarrhythmia's Study

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

Eligibility Criteria:
Inclusion Criteria:~* Patients with class I or II pacing indications for Sick Sinus Syndrome with suspected paroxysmal atrial tachyarrhythmias over the last 6 months~* Signed informed consent~* Age \>18 yrs~Exclusion Criteria:~* Severe valvular heart disease (echocardiogram less than 6 months old)~* Angina Pectoris class ≥ III~* Congestive heart failure - NYHA class ≥ III~* Left Ventricular Ejection Fraction \< 35% (less than 6 months old)~* Hypertrophic Cardiomyopathy

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

Study Arms:
- Optisense lead (Type: ACTIVE_COMPARATOR): Patients with an Accent pacemaker and an OptiSense atrial lead
- Tendril lead (Type: ACTIVE_COMPARATOR): Patients with an Accent pacemaker and a Tendril atrial lead

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