There are multiple definitions:

1. Heart Rhythm Society(English)

   • APHRS, AED, ECAS, EHRA, ESC, ICD, SCD

2. hepatorenal syndrome(English)

   • Kidney and adrenals, Liver disease

3. high resistance state(English)

   • CMOS, LRS, MOM, PCM

4. hyperreflective speck(English)

   • distinctive features included smaller diameter, lower reflectivity than the RPE band, and more uniform size than HRF
   • AF, AMD, HRF, ONL, RPE
   • Ophthalmology
   • https://doi.org…55/2021/6096017

5. high-risk stigmata(English)

   • refers to risk classification
   • ERCP, IPMN, PJC
   • Risk factor, Classification
   • https://doi.org…pan.2019.02.013

6. Hodgkin and Reed/Sternberg [cell](English)

   • B-CLL, HL, NF-kB, RS
   • Oncology, Cell biology
   • https://doi.org…cel.2003.10.025