Abdominal Radiology

, Volume 42, Issue 5, pp 1571–1578 | Cite as

Observation time after outpatient non-arterial interventional procedures: standards, safety, and outcomes

  • Christine K. ChenEmail author
  • Johannes Boos
  • Ammar Sarwar
  • Bridget O’Bryan-Alberts
  • Muneeb Ahmed
  • Olga R. Brook



To evaluate the impact of standardized reduced post-procedure observation time on subsequent healthcare encounters such as emergency department (ED) visits, hospital admissions, and clinic visits.


800 consecutive patients undergoing outpatient non-arterial interventional radiologic procedures within the vascular interventional department between 1 June 2013 and 21 July 2014 were included in this IRB-approved, HIPAA-compliant single center observational retrospective study. Electronic medical records were reviewed for subsequent healthcare encounters, such as ED visits, hospital admissions, and clinic visits. An attending interventional radiologist and radiology resident reviewed, in consensus, medical records for relevance of the encounter to the index procedure. Procedure-related encounters were analyzed to determine relationship to length of observation time, using Matlab for statistical analysis.


397 and 403 patients were in the pre- and post-standardization groups, respectively. Median observation time decreased overall from 1.67 h [interquartile range (IQR) 1.17–2.17] to 1.42 h (IQR 1.08–1.92), p < 0.001. There was no significant change in either overall or procedure-related ED visits (16.6% [66/397] and 1.0% [4/397] pre-standardization vs. 20.1% [81/403] and 2.2% [9/403] post-standardization, p = 0.24 and 0.26), hospital admissions (27.7% [110/397] and 4.0% [16/397] prestandardization vs. 28.3% [114/403] and 2.7% [11/403] post-standardization, p = 0.88 and 0.33), or clinic visits (41.3% [164/397] and 1.0% [4/397] pre-standardization vs. 39.5% [159/403] and 2.2% [9/403] post-standardization, p = 0.61 and 0.26).


Proposed standardized shortened observation times after outpatient interventional radiologic procedures are safe, without change in either total or procedure-related ED visits, hospital admissions, or clinic visits.


Post-procedure Observation times Outcomes Interventional radiology 



The authors would like to thank Alexander Brook and Donna Wolfe for their help in this study.

Compliance with ethical standards


No funding was received for this study.

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.

Informed consent

Statement of informed consent was not applicable since the manuscript does not contain any patient data.


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Copyright information

© Springer Science+Business Media New York 2017

Authors and Affiliations

  • Christine K. Chen
    • 1
    Email author
  • Johannes Boos
    • 1
  • Ammar Sarwar
    • 1
  • Bridget O’Bryan-Alberts
    • 1
  • Muneeb Ahmed
    • 1
  • Olga R. Brook
    • 1
  1. 1.Department of RadiologyBeth Israel Deaconess Medical CenterBostonUSA

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