There are multiple definitions:

1. hours post injury(English)

   • Hct, PAH, PID, PIH
   • Injury, Monitoring, Emergency medicine
   • https://doi.org…587.2016.03.003

2. hypotension prediction index(English)

   • algorithm is reliably available for finger-cuff derived arterial waveform
   • NoL, ML, PACU
   • Hemodynamics, Anesthesiology/analgesia
   • https://doi.org…bja.2024.08.007