title: Letter: A note of caution.
mesh_terms: D001158:Arteries; D001784:Blood Gas Analysis / Q000379:methods; D002404:Catheterization / Q000009:adverse effects*; D002408:Catheters, Indwelling / Q000009:adverse effects*; D005542:Forearm / Q000098:blood supply*; D006801:Humans; D007231:Infant, Newborn