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Predictive value of colour Doppler ultrasonography in detecting failure of vascular access grafts
Insights
Color Doppler ultrasonography can predict the success of polytetrafluoroethylene (PTFE) grafts for hemodialysis. Lower preoperative and postoperative blood flow rates detected by this imaging technique indicate a higher risk of graft thrombosis.
Area of Science:
- Vascular Surgery
- Radiology
- Nephrology
Background:
- Polytetrafluoroethylene (PTFE) grafts are crucial for hemodialysis vascular access.
- Assessing graft patency and predicting thrombosis are critical for patient outcomes.
Purpose of the Study:
- To investigate the predictive value of color Doppler ultrasonography for PTFE graft success in hemodialysis.
- To determine if preoperative and postoperative flow rates correlate with graft patency and thrombosis.
Main Methods:
- A comparative study involving two groups: clinical examination only (control) and color Doppler ultrasonography (Doppler group).
- Seventeen patients underwent pre- and post-operative color Doppler assessment of PTFE grafts.
- Graft patency and thrombosis were monitored over time.
Main Results:
- Patients who developed graft thrombosis had significantly lower median preoperative brachial artery flow rates (66 vs. 87 ml/min).
- Lower median postoperative graft flow rates were also observed in patients with thrombosis (480 vs. 800 ml/min).
Conclusions:
- Color Doppler ultrasonography demonstrates predictive value for initial PTFE graft success and long-term patency.
- Routine pre- and post-operative color Doppler assessment is recommended for patients receiving vascular access grafts.
Abstract:
The predictive role of colour Doppler ultrasonography in determining the initial success and long-term patency of polytetrafluoroethylene (PTFE) vascular access grafts for haemodialysis was investigated. Two groups of patients were studied. The upper extremities of 21 patients in the control group were assessed by clinical examination only; those of 17 in a second group (Doppler group) were also assessed by ultrasonography before and after operation. Straight PTFE vascular access grafts were used between the brachial artery and axillary vein in all patients. The median preoperative brachial artery flow rate was significantly lower in patients who later developed graft thrombosis (66 versus 87 ml/min, P < 0.01), as was the median postoperative graft flow rate (480 versus 800 ml/min, P < 0.001). Routine preoperative and postoperative colour Doppler ultrasonography is recommended for every patient in whom a vascular access graft is planned.