Effect of subsurface pressure on the interface pressure measurement in an in vitro experiment

Yung-wei Chi, Ray Lin, Kuo Hao Tseng, Blythe Durbin-Johnson

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


Introduction: It was hypothesized that subsurface pressure (mimicking subcutaneous pressure) variation may affect interface pressure measurement. Method: BISCO® (Rogers, CT) foam was placed on a cylinder cuff model for the experiment. Picopress® and a piezoresistive sensor were used for interface pressure measurement. External pressure was applied using an automated pressure cuff at 40 mmHg. Subsurface pressure mimicking subcutaneous pressure from 3 mmHg to 12 mmHg was generated by a pressure pump underneath the foam. Interface pressure was compared between the true pressure, 40 mmHg, versus Picopress® and the piezoresistive sensor using linear mixed effect model (SAS software, version 9.4, SAS Institute, Cary, NC). Result: Interface pressure measurement using Picopress® did not differ between the incremental subsurface pressures (mean 45.4 ± 0.4) (P = 0.54), in contrast to piezoresistive sensor, which demonstrated a difference (mean 42.65 ± 2.7) (P < 0.001). This difference appeared to be linearly related. Conclusion: Subsurface pressure mimicking subcutaneous pressure may affect the overall interface pressure measurement according to the piezoresistive sensor but not Picopress®.

Original languageEnglish (US)
StatePublished - Jan 1 2019


  • compression therapy
  • Interface pressure
  • manometry sensor
  • piezoresistive sensor
  • subcutaneous pressure
  • subsurface pressure

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine


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