Early Postoperative Ultrasonography Role for Av Fistula Failure Prediction in Hemodialysis Patients.

Abstract

Doppler ultrasonography is the main modality for imaging of hemodialysis AV stula as it is safe and non-invasive. This study is to measure the Arterio-venous (AV) stula blood ow during early postoperative period (0–7days) and assess its role in AV stula failure prediction. Doppler ultrasonography was used to estimate the blood ow in the AV stula of 50 patients at (0–7days) after the stula was made. The blood ow in stula during early postoperative period for stula failure was evaluated, and long term failure was predicted. Method Blood ow rates measured in arteriovenous stula created in upper extremity were measured in rst week and sixth week post-operative. Results After follow up evaluation out of 50 patients, 40 stulas considered to be matured; 10 considered failed. 30% failure were males and 70% were female. In early post operative period, cut off was set at 182 ml/min and the sensitivity of blood ow for prediction of stula failure is 98%, specicity 90 %, PPV 95% and NPV 90%. Conclusion Measurements of the AV stula blood ow in proximal artery and draining vein with its diameter of lumen were noted in the early postoperative period has a role predicting AV stula failure. There is risk of failure if the blood ow less than 182 ml/min (day 0–7).