There are multiple definitions:

1. avascular necrosis(English)

   • PFF
   • Pathology

2. atrioventricular node(English)

   • SAN, AP
   • Cardiology, Electrophysiology

3. aortic valve navigator(English)

   • multi-detector row computed tomography is currently the standard imaging modality for correct prosthesis sizing, despite risks of radiation and contrast-induced renal injury
   • MDCT, TAVR, TEE
   • Cardiology, Surgery
   • https://doi.org…cho.2017.10.003