Remember the Allen test.
D000368:Aged; D001157:Arterial Occlusive Diseases / Q000150:complications*; D002408:Catheters, Indwelling / Q000009:adverse effects*; D003097:Collateral Circulation; D005260:Female; D005542:Forearm / Q000098:blood supply*; D005734:Gangrene / Q000209:etiology* / Q000601:surgery; D006801:Humans; D013933:Thumb / Q000601:surgery