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Updated: Aug 11, 2026

A Multicenter MRI Protocol for the Evaluation and Quantification of Deep Vein Thrombosis
Published on: June 2, 2015
Comparison of measures for prospective identification of venous stenoses
L C Dinwiddie1, A C Frauman, P F Jaques
1School of Medicine, Division of Nephrology, University of North Carolina, Chapel Hill, USA.
Objective:
To compare two methods, venous dialysis pressure (VDP) and intra-access static flow pressure (VPO), for the prospective identification of venous stenoses in high-risk PTFE grafts.
Design:
Comparative.
Sample/Setting:
Twenty patients with upper extremity loop grafts in an outpatient chronic hemodialysis population.
Methods:
VDP and VPO were measured for three consecutive treatments within subjects followed by angiography. VDP > 150 mmHg/200 ml/min, VPO > 0.40, and stenoses > 50% were considered positive findings.
Results:
In paired t-tests, VPO identified elevated venous pressure more frequently than VDP in patients positive on angiography (mean difference = 77.8%, p < 0.0001). Frequency analysis yielded a sensitivity of 36% for VDP and 93% for VPO (p < 0.05).
Conclusion:
This study found that while VDP is the simpler method to use, VPO is significantly more accurate at predicting venous stenoses.
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