There are multiple definitions:

1. small vessel vasculitis(English)

   • a systemic autoimmune disease characterized by necrotizing inflammation of small blood vessels
   • ANCA, MPO, NET
   • Autoinflammatory, Microcirculation
   • https://doi.org….1002/art.34619

2. stroke volume variation(English)

   • Ea, Eadyn, PPV, SV, VE, SVI
   • Hemodynamics, Variability / oscillation, Anesthesiology/analgesia
   • https://doi.org…3054-014-0626-6
   • https://doi.org…1093/bja/aeq031
   • https://doi.org…560-024-00730-6

3. subjective visual vertical(English)

   • correlates with clinical dizziness symptoms in patients with acute unilateral vestibular neuritis
   • SVH, DHI, VADL
   • ENT, Neuropathy
   • https://doi.org…271674.41307.f2