There are multiple definitions:

1. fibrillation detection interval(English)

   • EGM, TDI
   • Electrophysiology, Cardiology

2. Fédération Dentaire Internationale(French)

   • Dentistry, Organizations (international)

3. first dorsal interosseous [muscle](English)

   • ISI, MEP, cMEP, iMEP, iSP
   • Anatomy, Myocyte / muscle
   • https://doi.org…let.2007.12.058
   • https://doi.org…2/jn.00950.2002

4. ferric derisomaltose(English)

   • for patients with heart failure and LVEF<45% and iron deficiency, intravenous administration of iron increases hemoglobin, improves symptoms, and reduces hospitalizations for heart failure
   • ACS, AF, AKI, HFrEF, MI, PTE, SVT, TSAT, VF, VT
   • Hematology, Cardiology, Pathology, Erythrocyte
   • https://doi.org…acc.2024.08.052