There are multiple definitions:

1. atrio-ventricular ring(English)

   • CT, PM, SAN
   • Cardiology

2. aortic valve replacement(English)

   • by a prosthesis
   • MVR, SAVR, TAVI, TVR, DI, RAMT, CR, AS, FS, CONC, MIS
   • Cardiology, Prosthetics, Rehabilitation
   • https://doi.org…OMES.122.009175

3. arteriole-to-venule diameter ratio(English)

   • widely used in studies of the associations of retinal microvascular disease with systemic and ocular outcomes
   • WBC, SBP, CRAE, CRVE
   • Microcirculation, Ophthalmology, Ratio-based metric, Quality and outcomes
   • https://doi.org…67/iovs.06-0672
   • https://doi.org…440-021-00623-3