There are multiple definitions:

1. image analyzing system(English)

   • Medical imaging

2. interatrial septum(English)

   • AVS, IVS, AF, CFD, CW, DRT, ICE, ISD, LA, LAA, LAAO, non-CW, PDL, PLAATO, SEC, TEE, TTE
   • Cardiology, Anatomy
   • https://doi.org…1111/echo.15722

3. International Atherosclerosis Society(English)

   • Cardiology, Organizations (international)

4. internal anal sphincter(English)

   • may be thickened as confirmed by anal endosonography
   • EAUS, PF
   • Gastroenterology
   • https://doi.org…082005000700004

5. internal alveolar surface(English)

   • changes in lung volume are related to the increase/decrease in the number of alveoli that are open/closed and not to the modification in the size of the alveoli
   • AS, TPP
   • Respiratory system
   • https://doi.org…14670/HH-17.383

6. inappropriate shock(English)

   • S-ICDs may be associated with increased inappropriate shock in HCM patients
   • HCM, ICD, S-ICD
   • Electrophysiology, Cardiology
   • https://doi.org…thm.2020.02.008

7. irrigation activation system(English)

   • may refer to postoperative pain in maxillary incisors with asymptomatic apical periodontitis
   • PP, XPF
   • Dentistry, Ultrasound, Laser technique
   • https://doi.org/10.1002/cre2.786