There are multiple definitions:

1. supraventricular ectopy(English)

   • higher presence and rate of ectopy tends to increase with duration of the flight condition
   • AVR, cfVE, ECG, NSVT, PVC, VE, VEB
   • Cardiology, Electrophysiology, Oxygen, Aviation medicine
   • https://doi.org…598-022-27113-x

2. simple visual estimation(English)

   • CHD, MCI, MCW, PMI
   • Medical imaging, Skeleton and bone (formation), Pediatrics
   • https://doi.org…hildren10020227