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Related Experiment Videos

Accuracy of decrease in blood flow in predicting hemodialysis graft thrombosis.

W D Paulson1, S J Ram, C G Birk

  • 1Department of Medicine, Division of Nephrology, Interventional Nephrology Section, Louisiana State University Health Sciences Center, Shreveport, LA 71130, USA.

American Journal of Kidney Diseases : the Official Journal of the National Kidney Foundation
|June 10, 2000
PubMed
Summary
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Neither graft blood flow changes nor mean arterial pressure adjustments accurately predict graft thrombosis. Current methods lack the required sensitivity and specificity for sole clinical decision-making in preventing graft thrombosis.

Area of Science:

  • Vascular Surgery
  • Medical Monitoring
  • Diagnostic Accuracy

Background:

  • A single low graft blood-flow measurement (Qa) has shown limitations in predicting graft thrombosis.
  • The clinical utility of assessing changes in Qa (DeltaQa) or Qa adjusted for mean arterial pressure (MAP) remains to be fully elucidated.

Purpose of the Study:

  • To prospectively evaluate if DeltaQa or Qa/MAP offers improved predictive accuracy for graft thrombosis compared to a single Qa measurement.
  • To determine if these adjusted metrics meet clinical criteria for high sensitivity (>80%) and low false-positive rates (<20%).

Main Methods:

  • Prospective monitoring of 83 grafts in 80 patients for thrombosis over 12 months.
  • Monthly measurements of graft blood flow (Qa) using ultrasound dilution and mean arterial pressure (MAP).

Related Experiment Videos

  • Analysis using receiver operating characteristic (ROC) curves to compare predictive accuracy (Area Under the Curve - AUC) of Qa, DeltaQa, Qa/MAP, and Delta(Qa/MAP).

    • Main Results:

    • All tested predictors (Qa, DeltaQa, Qa/MAP, Delta(Qa/MAP)) demonstrated AUCs below the required 0.90 for clinical utility.
    • Adjustment for MAP (Qa/MAP and Delta(Qa/MAP)) reduced the predictive accuracy compared to unadjusted Qa and DeltaQa.
    • At 80% sensitivity, all predictors exhibited false-positive rates of at least 30%, indicating a trade-off between sensitivity and specificity.

    Conclusions:

    • Neither DeltaQa nor Qa/MAP provides significantly greater predictive accuracy for graft thrombosis than a single low Qa measurement.
    • Current monitoring methods, including these adjustments, are insufficient as sole criteria for clinical decision-making.
    • Future monitoring programs require integrating additional predictors with Qa to achieve the necessary accuracy for preventing graft thrombosis.