Duplex scan graft surveillance: how often and in whom?
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1Department of Surgery, Community Hospital of Roanoke Valley, Virginia, USA.
Insights
Postoperative surveillance of infrainguinal bypass grafts using duplex scans is crucial. This study found that while duplex scans are valuable, individualized follow-up protocols are necessary for optimal graft monitoring.
Area of Science:
- Vascular Surgery
- Medical Imaging
- Graft Surveillance
Background:
- Postoperative surveillance of infrainguinal grafts is challenging.
- Accurate and cost-effective protocols are needed to detect failing grafts early and monitor long-term patency.
Purpose of the Study:
- To determine an effective postoperative surveillance protocol for infrainguinal bypass grafts.
- To identify a method that is both cost-effective and accurate in detecting early graft failure and monitoring long-term outcomes.
Main Methods:
- Evaluation of 86 infrainguinal bypass grafts in 61 patients over a 6-year period.
- Analysis of 116 postoperative duplex scans measuring graft velocities.
- Comparison of demographic data, angiograms, medical records, and duplex scan findings.
Main Results:
- 59% of grafts showed normal velocities and long-term patency.
- 17% of grafts with normal scans occluded unexpectedly shortly after examination.
- Abnormal velocities in 13% of grafts led to timely surgical revision, while 11% occluded before revision.
Conclusions:
- Duplex scanning is a valuable tool for evaluating and monitoring infrainguinal bypass grafts.
- Graft surveillance protocols should be individualized based on graft characteristics and velocity measurements.
- Further analysis is needed for grafts with normal duplex scans that subsequently occlude.
Abstract:
The appropriate postoperative surveillance of infrainguinal grafts remains difficult and controversial topic. This study was undertaken to determine a surveillance protocol that was not only cost effective but accurate in detecting both high risk, early failing grafts as well as following long-term grafts. All patients who had an infrainguinal bypass and a postoperative duplex scan measuring velocities over a 6-year period were evaluated. The demographic data, angiograms, medical records, and duplex scans were evaluated, studied, and compared. There were a total of 116 duplex scans performed on 86 grafts in 61 patients. On the basis of velocity measurements and graft patency, grafts were categorized into four groups. The largest group (59%) were those with normal velocities and long-term graft patency. The other group with normal values (17%) was a subset of grafts that occluded shortly after the scans for no apparent reason. This group of occluded grafts with normal scans was closely scrutinized and analyzed. The other two groups both had abnormal values, one (13%) that detected abnormalities and directed surgical revision while the other (11%) occluded before revision. The duplex scan has allowed the vascular surgeon to carefully evaluate and follow infrainguinal bypasses; however, different grafts require different follow-up.