Journal article
Propofol-induced interference with activated partial thromboplastin time-based monitoring of therapeutic heparin anticoagulation
American journal of health-system pharmacy : AJHP, Vol.80(7), pp.445-451
04/01/2023
DOI: 10.1093/ajhp/zxac337
PMID: 36370416
Abstract
DISCLAIMER In an effort to expedite the publication of articles, AJHP is posting manuscripts online as soon as possible after acceptance. Accepted manuscripts have been peer-reviewed and copyedited, but are posted online before technical formatting and author proofing. These manuscripts are not the final version of record and will be replaced with the final article (formatted per AJHP style and proofed by the authors) at a later time. PURPOSE The activated partial thromboplastin time (aPTT) is a coagulation assay commonly utilized for monitoring therapeutic heparin anticoagulation. aPTT methods based on optical detection are vulnerable to spectral interference from hemolysis, icterus, lipemia, and other substances. Intravenous lipid emulsions of primarily 20% have been shown to interfere with multiple clinical laboratory assays, including those measuring aPTT by optical methods, but there is limited data on propofol's effect. The primary objective of this study was to determine the rate of interference of propofol with aPTT measurements in patients receiving both propofol and intravenous heparin. METHODSA retrospective observational cohort study of intensive care unit patients who received concomitant propofol and heparin infusions (N = 38 patients) and whose heparin therapy was monitored by aPTT (N = 531 aPTTs) was conducted. Review of the electronic medical record was completed to obtain relevant clinical and laboratory data, while the laboratory information system was queried for analytical interference with the aPTT assay. RESULTSA total of 109 aPTTs (21%) spanning 21 patients (55%) had documented aPTT interference. All 21 patients had at least one aPTT requiring ultracentrifugation prior to reporting, and 12 aPTTs from 4 patients were unreportable due to interference. Patients with and without aPTT interference received similar doses of propofol. None of the cases of aPTT interference were caused by hemolysis or hyperbilirubinemia. CONCLUSIONA potential medication-assay interaction was observed in approximately half of patients who received concomitant propofol and heparin infusions and had aPTT measured for anticoagulation management. Sample ultracentrifugation removes the optical interference in most cases but significantly prolongs aPTT reporting and delays appropriate adjustments to heparin dosing.
Details
- Title: Subtitle
- Propofol-induced interference with activated partial thromboplastin time-based monitoring of therapeutic heparin anticoagulation
- Creators
- Briana J Negaard - Indiana University HealthRyan Hobbs - University of IowaJared R Frye - University of Iowa Hospitals and ClinicsAnna E Merrill - University of Iowa
- Resource Type
- Journal article
- Publication Details
- American journal of health-system pharmacy : AJHP, Vol.80(7), pp.445-451
- DOI
- 10.1093/ajhp/zxac337
- PMID
- 36370416
- NLM abbreviation
- Am J Health Syst Pharm
- ISSN
- 1079-2082
- eISSN
- 1535-2900
- Language
- English
- Electronic publication date
- 11/12/2022
- Date published
- 04/01/2023
- Academic Unit
- Pathology; Injury Prevention Research Center
- Record Identifier
- 9984317459402771
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