There are multiple definitions:

1. right anterior oblique(English)

   • LAO
   • Medical imaging

2. radial artery occlusion(English)

   • remains the “Achilles’ heel” of the distal transradial access approach. Due to the dual vascular supply of the hand from the palmar arch, RAO extremely rarely causes clinical manifestations. However, the existence of RAO precludes the future use of the radial artery as an access point for a new endovascular procedure or as a conduit for coronary artery bypass surgery
   • dTRA, PCI, TRA
   • Coronary circulation
   • https://doi.org…cin.2022.05.001

3. retinal artery occlusion(English)

   • CRAO, RVO
   • Ophthalmology, Vascular disease
   • https://doi.org…390/jcm11144076

4. recurrent airway obstruction(English)

   • frequent coughing, increased breathing effort, exercise intolerance, or a combination of these. Obsolete name for equine asthma
   • IAD, NBM, HOARSI
   • Respiratory system, Asthma, Veterinary medicine
   • https://doi.org…al.pone.0293956
   • https://doi.org…1111/jvim.12279