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Defining the incidence of cardiorespiratory instability in patients in step-down units using an electronic integrated monitoring system

Hravnak, M and Edwards, L and Clontz, A and Valenta, C and DeVita, MA and Pinsky, MR (2008) Defining the incidence of cardiorespiratory instability in patients in step-down units using an electronic integrated monitoring system. Archives of Internal Medicine, 168 (12). 1300 - 1308. ISSN 0003-9926

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Background: To our knowledge, detection of cardiorespiratory instability using noninvasive monitoring via electronic integrated monitoring systems (IMSs) in intermediate or step-down units (SDUs) has not been described. We undertook this study to characterize respiratory status in an SDU population, to define features of cardiorespiratory instability, and to evaluate an IMS index value that should trigger medical emergency team (MET) activation. Methods: This descriptive, prospective, single-blinded, observational study evaluated all patients in a 24-bed SDU in a university medical center during 8 weeks from November 16, 2006, to January 11, 2007. An IMS (BioSign; OBS Medical, Carmel, Indiana) was inserted into the standard noninvasive hardwired monitoring system and used heart rate, blood pressure, respiratory rate, and peripheral oxygen saturation by pulse oximetry to develop a single neural networked signal, or BioSign Index (BSI). Data were analyzed for cardiorespiratory instability according to BSI trigger value and local MET activation criteria. Staff were blinded to BSI data collected in 326 patients (total census). Results: Data for 18 248 hours of continuous monitoring were captured. Data for peripheral oxygen saturation by pulse oximetry were absent in 30% of monitored hours despite being a standard of care. Cardiorespiratory status in most patients (243 of 326 [74.5%]) was stable throughout their SDU stay, and instability in the remaining patients (83 of 326 [25%]) was exhibited infrequently. We recorded 111 MET activation criteria events caused by cardiorespiratory instability in 59 patients, but MET activation for this cause occurred in only 7 patients. All MET events were detected by BSI in advance (mean, 6.3 hours) in a bimodal distribution (>6 hours and ≤45 minutes). Conclusions: Cardiorespiratory instability, while uncommon and often unrecognized, was preceded by elevation of the IMS index. Continuous noninvasive monitoring augmented by IMS provides sensitive detection of early instability in patients in SDUs. ©2008 American Medical Association. All rights reserved.


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Item Type: Article
Status: Published
CreatorsEmailPitt UsernameORCID
Hravnak, Mmhra@pitt.eduMHRA
Edwards, L
Clontz, A
Valenta, C
DeVita, MA
Pinsky, MRpinsky@pitt.eduPINSKY0000-0001-6166-700X
Date: 23 June 2008
Date Type: Publication
Journal or Publication Title: Archives of Internal Medicine
Volume: 168
Number: 12
Page Range: 1300 - 1308
DOI or Unique Handle: 10.1001/archinte.168.12.1300
Schools and Programs: School of Medicine > Critical Care Medicine
Refereed: Yes
ISSN: 0003-9926
PubMed ID: 18574087
Date Deposited: 05 Mar 2012 17:35
Last Modified: 24 Feb 2021 11:55


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