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The correlation of peroperative outflow resistance measurements with patency 109 infrainguinal arterial
G A Vos1, J A Rauwerda, T A van den Broek
1Academic Hospital, Free University, Department of Surgery, Amsterdam, The Netherlands.
Insights
Intraoperative outflow resistance measurements in femoro-popliteal and femoro-crural bypass grafts show limited predictive value for graft patency. While higher resistance correlates with occlusion, significant overlap in values limits individual case prediction.
Area of Science:
- Vascular Surgery
- Biomedical Engineering
- Medical Diagnostics
Background:
- Assessing the long-term success of infrainguinal arterial reconstructions is crucial for patient outcomes.
- Outflow resistance is a potential intraoperative parameter to predict bypass graft patency.
Purpose of the Study:
- To analyze the predictive value of intraoperative outflow resistance measurements for the patency of femoro-popliteal and femoro-crural bypass grafts.
Main Methods:
- Performed peroperative outflow resistance measurements in 109 infrainguinal arterial reconstructions.
- Analyzed the correlation between outflow resistance and bypass graft patency at 3 months.
- Utilized statistical analysis to determine the significance of the correlations.
Main Results:
- Outflow resistance was significantly higher in occluded bypasses compared to patent ones (P < 0.01).
- A considerable overlap in resistance values was observed between patent and occluded grafts.
- Marginal, non-significant correlation (R = -0.25, P = 0.064) for femoro-popliteal bypasses.
- Marginal, statistically significant correlation (R = -0.27, P = 0.05) for femorocrural bypasses.
Conclusions:
- Intraoperative outflow resistance measurements have limited value in predicting individual bypass graft patency.
- Further research may be needed to identify more reliable intraoperative predictors of graft success.
Abstract:
The predictive value of outflow resistance measurements for the patency of femoro-popliteal and femoro-crural bypass grafts was analysed. Peroperative outflow resistance measurements were performed in 109 infrainguinal arterial reconstructions. Outflow resistance was significantly higher in occluded bypasses compared with those which remained open (P less than 0.01), but there was a considerable overlap of values in both groups. Statistical analysis of the correlation between outflow resistance and patency rates at 3 months revealed a marginal correlation in the femoro-popliteal bypass group (R = -0.25), which was not significant (P = 0.064). In the femorocrural bypass group there was again only a marginal correlation (R = -0.27) but this was statistically significant (P = 0.05). These data demonstrate that intraoperative outflow resistance measurements are only of limited value for predicting bypass patency in individual cases.