There are multiple definitions:

1. tricuspid regurgitation peak gradient(English)

   • E/A, E/SV, HF, LV, PCWP, PLL, RHC, SV
   • Cardiology, Biophysics
   • https://doi.org…1111/echo.15756

2. tumor regression grade(English)

   • TRAE, MPR, PCR
   • Oncology, Therapeutic approaches
   • https://doi.org…mu.2024.1339757