There are multiple definitions:

1. regular rate and rhythm(English)

   • Electrophysiology, Cardiology

2. relative risc reduction(English)

   • AAA, ARR, QALY

3. reversed reverse remodeling(English)

   • 3R’s, EF, LVRR
   • Cardiology

4. resistive reserve ratio(English)

   • used to assess vasodilatory capacity. Calculated as {P(resting))x tTmean(resting} / {Pd(hyperemia) x tTmean(hyperemia)} with Pd as pressure distal to coronary occlusion. Value ≤ 2 is used as a cut-off for impaired microvascular vasodilator capacity
   • BRI, CFR, CMD, IMR, IS, LCBI, LVESVi, MLA, MVO, PCI, PICSO, PPCI, SAFT, STEMI, TTS
   • Coronary circulation, Hemodynamics, Ratio-based metric, Microcirculation
   • https://doi.org….1002/ccd.29793
   • https://doi.org…1002/ehf2.14394
   • https://doi.org…rev.2019.01.022

5. relative risk reduction(English)

   • ARNI, HFrEF, GDMT, MRA, NT-proBNP, SGLT2i
   • Risk factor, Preventive medicine
   • https://doi.org…NAHA.124.070228

6. ratio of relative risk(English)

   • CVD, DRD, IPD, OR, RR, SE, UKB
   • Statistics, Ratio-based metric, Epidemiology, Cardiology
   • https://doi.org…jnl-2019-315299