Positive Psychology for Acute Coronary Syndrome Patients

This is a randomized controlled pilot trial in approximately 50 acute coronary syndrome patients to determine if a 12 week, telephone-delivered, combined positive psychology-motivational interviewing intervention is feasible and more effective than a motivational interviewing health education program at improving health behaviors and other outcomes. The investigators hypothesize that the intervention will be associated with better mental and physical health outcomes and better health behavior adherence compared to the motivational interviewing health education program.

The initial study visit will occur in-person two weeks after discharge from the hospital. Participants will meet with a member of the study staff (the study "trainer") and complete self-report questionnaires assessing health behavior adherence and mental and physical health. Then, participants will be randomized to receive the positive psychology + motivational interviewing or the motivational interviewing health education interventions. A study interventionist will provide a treatment manual specific to their condition, review the rationale for the initial exercise, and assign the first exercise. If the participant is in the positive psychology + motivational interviewing condition, the trainer will explain the rationale for both the positive psychology and goal-setting portions of the program, and will be assigned the first exercise. Similarly, if the participant is randomized into the motivational interviewing health education program, the interventionist will introduce them to the program and assign the first exercise. Participants in both groups will then be given an accelerometer, which they will be asked to wear for 7 days to ensure that they are comfortable with the device and that useable data can be obtained from the participant. Participants in both groups will then complete twelve 30-minute weekly phone sessions with a study trainer. The phone sessions primarily will include a review of the prior week's session content and a discussion of the rationale and assignment of the next week's exercise/assignment. Upon the completion of these calls, and again at a final follow-up timepoint at 24 weeks, a blinded member of the study staff will call participants to administer self-report outcome measures. Participants will also be asked to wear an accelerometer at each of these follow-up timepoints as an objective measure of physical activity, which they will return by mail to the study staff.

Eligibility Criteria:
Inclusion Criteria:

* Adult patients admitted to Massachusetts General Hospital or Brigham and Women's Hospital inpatient units
* Diagnosis of acute coronary syndrome (using established criteria for myocardial infarction or unstable angina; confirmed via medical record and/or patient's treatment team)
* Age 18 or older
* Suboptimal adherence on MOS-SAS: Score \< 15 OR Score = 15 with physical activity \< 6

Exclusion Criteria:

* Cognitive deficits, assessed via a 6-item cognitive screen used to assess appropriate participation of medically ill patients in research studies.
* Medical conditions precluding interviews or likely to lead to death within 6 months, determined in consultation with the primary treatment team and cardiology co-investigator.
* Inability to perform moderate to vigorous physical activity, as defined by an inability to walk without aid of an assistive device such as a walker or cane, OR inability to walk at a steady pace for at least 5 minutes without stopping.
* Inability to communicate in English.
* Inability to participate in physical activity