Working collaboratively with cardiologists, cardiothoracic surgeons, nursing staff, and multidisciplinary team members, the APP provides high-quality, evidence-based clinical care across the continuum, including inpatient and outpatient settings. OAPP: If practicing in an outpatient or other non-inpatient setting, APPs can use one of the certifications above or use a business unit approved certification which is relevant, and value added to the practice setting.