title: False alarm rates of three third-generation pulse oximeters in PACU, ICU and IABP patients.
abstract: The objective of this clinical study was to determine alarm rates--in particular the frequency of false positive alarms--of three third-generation pulse oximeters in the postanesthesia care unit (PACU), the intensive care unit (ICU), and in patients with an intra-aortic balloon pump (IABP): Nellcor Symphony N-3000, a Masimo IVY 2000, and Agilent Viridia CMS 2000. All alarms were classified into technical/physiological and false/correct. 235 consecutive ASA physical status I-IV patients after surgery were included into the study. In the PACU false positive alarms were rare: CMS n = 60, N-3000 n = 60, Masimo n = 87. Bland-Altman testing discovered only negligible differences of alarm rates and dropout times. Out of a total of 728 alarms 67.3% were classified as false positive in ICU-patients: 97 alarms by CMS, 176 by N-3000 and 218 by Masimo SET. If IABP was present, CMS indicated a significant smaller number of false positive alarms (n = 35, 7.2%) when compared to Masimo SET (n = 188, 38.9%) and N-3000 (n = 229, 47.4%), consecutively the majority of false positive alarms (76.2%) can be rated as a result of the interference of IABP. Unless IABP (and to a considerably smaller extent cardiac arrhythmia) is present the pulse oximeters do not differ significantly regarding sensitivity and specificity.
authors.affiliation: Department of Anesthesiology, University of Erlangen-Nuremberg, Erlangen, Germany. norbert.luttner@kfa.imed.uni-erlangen.de
authors.forename: Norbert O
authors.initials: NO
authors.lastname: Lutter
authors.forename: Sabine
authors.initials: S
authors.lastname: Urankar
authors.forename: Steffi
authors.initials: S
authors.lastname: Kroeber
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005189:False Positive Reactions; D005260:Female; D006801:Humans; D007362:Intensive Care Units; D007423:Intra-Aortic Balloon Pumping; D008297:Male; D008875:Middle Aged; D010092:Oximetry; D016528:Postanesthesia Nursing; D012680:Sensitivity and Specificity