There are multiple definitions:

1. hormone replacement therapy(English)

   • ERT, TRT
   • Hormone, Therapeutic approaches
   • https://doi.org…srev.00041.2022

2. heart rate turbulence(English)

   • CVHR, HRV, HR, TWA, ECG, MACE
   • Electrophysiology, Cardiology, Variability / oscillation
   • https://doi.org…390/jcm14207209

3. Habit and Reversal Training(English)

   • e.g. for treating trichotillomania, which is an impulse control disorder characterized by intense and repeated urge to pull out hairs with a mounting tension before and a sense of relief afterwards
   • TTM
   • Behavior(al science), Psychology, Therapeutic approaches
   • https://doi.org…0974-7753.96089

4. human respiratory tract [system](English)

   • ACI, AIM, AIM-pHRT, CPM, EPM, FPM, OIP, pHRT, QC, USP
   • Respiratory system, Pharmacology / pharmaceutics
   • https://doi.org…/jamp.2011.0925

5. Heidelberg Retina Tomograph(English)

   • refers to corneal modifications induced by either femtosecond laser or mechanical microkeratome
   • LASIK
   • Ophthalmology, Medical imaging, Laser technique
   • https://doi.org…67/iovs.05-1207

6. heart replacement therapy(English)

   • in the form of a left ventricular assist device or cardiac transplantation is the gold standard
   • HTX, LVAD
   • Cardiology, Surgery
   • https://doi.org…bts.2025.01.009

7. high-intensity resistance training(English)

   • AT, CPET, LVEDV, HFpEF
   • Exercise & Training, Cardiology, Rehabilitation
   • https://doi.org…chf.2025.102828

8. heel rise test(English)

   • used for the assessment of calf muscle function and venous emptying. Also, determination of calf ejection fraction
   • CVD, EF, NIRS, VAS
   • Vascular disease, Woman /female, Diagnostics
   • https://doi.org…jvn.2025.08.004