title: The penumbra effect: vasomotion-dependent pulse oximeter artifact due to probe malposition.
authors.affiliation: Department of Anesthesiology, Mercy Hospital and Medical Center, San Diego, California 92103.
authors.forename: J F
authors.initials: JF
authors.lastname: Kelleher
authors.forename: R H
authors.initials: RH
authors.lastname: Ruff
mesh_terms: D004560:Electricity; D004868:Equipment Failure; D006801:Humans; D007432:Intraoperative Period; D008297:Male; D008875:Middle Aged; D010092:Oximetry / Q000295:instrumentation*; D014666:Vasomotor System / Q000502:physiology*