Document Detail

Determinants of measured dialysis venous pressure and its relationship to true intra-access venous pressure.
MedLine Citation:
PMID:  1751143     Owner:  NLM     Status:  MEDLINE    
Venous pressure measured at the venous bubble trap (VPdm) is a complex function of true intra-access pressure (VP0), hematocrit, needle gauge, and blood flow. In a patient free circuit, needle gauge, hematocrit, and blood flow influenced the pressure drop through the venous return needle. Measured intra-access pressure (VPm) and VPdm also were determined 149 times in 83 subjects. The increase in VPdm above VP0 under conditions of flow through 16 gauge needles was affected by blood flow rate, hematocrit, and VP0 with coefficients similar to those found in vitro. Calculation of VP0 from VPdm produced an absolute difference greater than 20 mmHg in 35-40% of cases. Mean VP0 was significantly lower in subjects with native compared with expanded polytetrafluorethylene accesses. It was concluded that VP0 is influenced by access type and can be estimated but that direct measurement is preferred. Direct measurement of VP0 may be a sensitive test to screen for venous outlet stenosis because it should vary with access flow and outlet geometry.
A Besarab; S Dorrell; M Moritz; H Michael; K Sullivan
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  ASAIO transactions / American Society for Artificial Internal Organs     Volume:  37     ISSN:  0889-7190     ISO Abbreviation:  ASAIO Trans     Publication Date:    1991 Jul-Sep
Date Detail:
Created Date:  1992-01-29     Completed Date:  1992-01-29     Revised Date:  2004-11-17    
Medline Journal Info:
Nlm Unique ID:  8611947     Medline TA:  ASAIO Trans     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  M270-1     Citation Subset:  IM    
Department of Surgery, College of Medicine of Thomas Jefferson University, Philadelphia, Pennsylvania.
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MeSH Terms
Arteriovenous Shunt, Surgical*
Blood Flow Velocity
Blood Pressure Monitors*
Blood Vessel Prosthesis
Kidney Failure, Chronic / physiopathology*,  therapy*
Renal Dialysis / instrumentation*
Signal Processing, Computer-Assisted / instrumentation*
Transducers, Pressure
Venous Pressure / physiology*

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