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Original research
Use of a pressure sensing sheath: comparison with standard means of blood pressure monitoring in catheterization procedures
  1. Phillip D Purdy1,
  2. Charles South2,
  3. Richard P Klucznik3,
  4. Kenneth C Liu4,
  5. Robin L Novakovic5,
  6. Ajit S Puri6,
  7. G Lee Pride7,
  8. Beverly Aagaard-Kienitz8,
  9. Abishek Ray9,
  10. Alan C Elliott2
  1. 1Endophys Holdings, LLC, Dallas, Texas, USA
  2. 2Department of Statistical Science, Southern Methodist University, Dallas, Texas, USA
  3. 3Department of Interventional Neuroradiology, Methodist Hospital Houston, Houston, Texas, USA
  4. 4Department of Neurological Surgery, University of Virginia, Charlottesville, Virginia, USA
  5. 5Departments of Radiology, Neurology, and Neurotherapeutics, University of Texas Southwestern Medical Center, Dallas, Texas, USA
  6. 6Department of Radiology, University of Massachusetts, Worcester, Massachusetts, USA
  7. 7Departments of Radiology and Neurosurgery, UT Southwestern Medical Center, Dallas, Texas, USA
  8. 8Departments of Radiology and Neurological Surgery, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin, USA
  9. 9Department of Neurological Surgery, University Hospitals Case Medical Center, Cleveland, Ohio, USA
  1. Correspondence to Dr P D Purdy, Endophys Holdings, LLC, 1601 Elm Street, Suite 1930, Dallas, Texas 75201, USA; ppurdy{at}


Purpose Monitoring of blood pressure (BP) during procedures is variable, depending on multiple factors. Common methods include sphygmomanometer (BP cuff), separate radial artery catheterization, and side port monitoring of an indwelling sheath. Each means of monitoring has disadvantages, including time consumption, added risk, and signal dampening due to multiple factors. We sought an alternative approach to monitoring during procedures in the catheterization laboratory.

Methods A new technology involving a 330 µm fiberoptic sensor embedded in the wall of a sheath structure was tested against both radial artery catheter and sphygmomanometer readings obtained simultaneous with readings recorded from the pressure sensing system (PSS). Correlations and Bland–Altman analysis were used to determine whether use of the PSS could substitute for these standard techniques.

Results The results indicated highly significant correlations in systolic, diastolic, and mean arterial pressures (MAP) when compared against radial artery catheterization (p<0.0001), and MAP means differed by <4%. Bland–Altman analysis of the data suggested that the sheath measurements can replace a separate radial artery catheter. While less striking, significant correlations were seen when PSS readings were compared against BP cuff readings.

Conclusions The PSS has competitive functionality to that seen with a dedicated radial artery catheter for BP monitoring and is available immediately on sheath insertion without the added risk of radial catheterization. The sensor is structurally separated from the primary sheath lumen and readings are unaffected by device introduction through the primary lumen. Time delays and potential complications from radial artery catheterization are avoided.

  • Blood Pressure
  • Catheter
  • Angiography
  • Device

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