Please assess the completion status of the following clinical trial:

Trial Title: Breathing Intervention for Cardiac Anxiety

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

Eligibility Criteria:
Inclusion Criteria:~* Age 18 to 80~* BMI 17 to 35~* Proficient in English language~* Paroxysmal atrial fibrillation or ventricular fibrillation or frequent premature atrial/ventricular contractions~Exclusion Criteria:~* No telephone access~* Active suicidal ideation with intent or plan~* Active drug or alcohol dependence, or active binge drinking within the last month~* Cardiovascular instability, as evidenced any of the following:~  1. New York Heart Association (NHYA) heart failure class IV (i.e., unable to carry on any physical activity without discomfort, symptoms of heart failure at rest, increased discomfort with any physical activity is undertaken)~ 2. American College of Cardiology/American Heart Association congestive heart failure stage D (i.e., heart failure symptoms at rest, receiving end of life care).~ 3. Unstable angina or exercise induced angina~ 4. Persistent atrial fibrillation~* Pacemakers or combined pacemaker/ICDs will be excluded~* Presence of unstable cardiac, vascular, pulmonary, gastrointestinal, endocrine, neurologic, hematologic, rheumatologic, or metabolic disease; or any other condition that, in the opinion of the investigator, would make participation not be in the best interest (e.g., compromise the well-being) of the subject or that could prevent, limit, or confound the protocol-specified assessments.

- Gender: ALL
- Minimum Age: 18 Years
- Maximum Age: 80 Years
- Healthy Volunteers: t

Study Arms:
- Breathing exercise (Type: EXPERIMENTAL): Participants will perform a paced breathing intervention (slow breathing) prompted by pseudorandomized remote reminders (scheduled reminders plus non scheduled reminders), through cellular phone application.

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