There are multiple definitions:

1. Riva-Rocci(English)

   • meaning noninvasive arterial blood pressure determination
   • BP, DBP, SBP
   • Hypertension

2. relative risk(English)

   • HR, PAR, aRR

3. respiratory rate(English)

   • BP, HR, HRV, AP, AVN, CNS, CVLM, DMV, DRA, DRG, GP, ICNS, NA, NPY2R, NTS, PG, RVLM, SAN, SG, VRA, VSN
   • Pulmonology, Nervous activity - (para)sympathetic, Brain (dys)function, Cardiology
   • https://doi.org…siol.00018.2024

4. risk ratio(English)

   • aRR
   • Epidemiology, Statistics

5. cardiac cycle length(English)

   • i.e. interval from R-peak to next R-peak in ECG
   • DFP, ISTI
   • Electrophysiology, Cardiology

6. retention rate(English)

   • refers to gastric emptying
   • ADM, GE, GES, MMC, PIPO, TTP
   • Gastroenterology
   • https://doi.org….1111/nmo.14334

7. radioresistant(English)

   • now recognized as the major obstacle to the effective therapeutic management of non-small-cell lung cancer
   • lncRNA, NSCLC, RS, TCGA
   • Oncology, Pulmonology, Therapeutic approaches
   • https://doi.org…55/2021/4338838

8. Recall Reminder(English)

   • refers to effectiveness of reminder procedures for established patients returning for follow-up appointments
   • NIRMO, OIG, SOP, VHA, TURNUP
   • Guidelines
   • https://www.ncb…ooks/NBK384609/

9. rituximab-resistant(English)

   • clones are established from lymphoma lines and compared with parental cells
   • Bcl-2
   • Chemotherapy, Lymphatic system/lymphoma
   • https://doi.org…472.CAN-06-2184

10. relapse risk(English)

    • AML, GO, DFS, EFS, OS
    • Leukemia, Prognosis
    • https://doi.org…00/JCO.20.03048

11. retrorectus(Latin)

    • refers to ventral abdominal hernia repair with biosynthetic mesh
    • PRO, TAM, TAR, VHR
    • Surgery, Myocyte / muscle
    • https://doi.org…urg.2021.03.020

12. retrorubral [nucleus](English)

    • PHA-L, SNc, VTA
    • Neurons, Brain (dys)function
    • https://doi.org…nce.2008.02.003

13. residual risk(English)

    • HBV, HCV, HIV, NAT
    • Risk factor
    • https://doi.org…59/cureus.34216

14. rigid reamer(English)

    • ACL, ACLR, AM, FR
    • Knee, Orthopedics, Surgery
    • https://doi.org…259671211035741

15. recall rate(English)

    • may refer to imaging in the post-treatment surveillance of patients with a history of breast cancer
    • CDR
    • Mammary gland, Surveillance, Medical imaging
    • https://doi.org…adi.2023.07.001

16. reduction rate(English)

    • vertebral compression (CR), progressive height loss (PHL), reduction angle (RA), and progressive angle (PA) can be calculated
    • IVC, ODI, OVCF, PA, PHL, PKP, PVP, RA, VAS
    • Spine (or spinal cord), Surgery, Biophysics
    • https://doi.org…2-1892.20160225

17. rate ratio(English)

    • PYE
    • Ratio-based metric, Insulin, Clinical chemistry
    • https://doi.org…/jama.2017.7115

18. rupture risk(English)

    • AIE, AMI, AMS, CTA, EL, EVAR, IBD
    • Risk factor, Vascular disease
    • https://doi.org…vsg.2024.05.022