The function of arteriovenous endovascular fistula can be assessed by tremor, pulsation, blood flow, arm lifting test, clinical manifestations such as whether it is normal and stenosis site.
1. Normal function of arteriovenous endovascular fistula: it means that the endovascular fistula has continuous tremor, good elasticity, can be deflated, blood flow >200ml/min or more, arm lift test is normal, the puncture area is sufficient, and the time of stopping hemorrhage is 20~30min after dialysis.
2. Stenosis of outflow tract of arteriovenous fistula: tremor and pulsation at the stenosis are enhanced, no collapsing of blood vessels when lifting the arm, blood flow decreases, venous pressure increases, and the hemostasis time after dialysis is prolonged.
3. Stenosis of the inflow tract of the arteriovenous fistula: discontinuous tremor, severe tremor disappeared, weakened beat, normal or apparently no collapse of the blood vessels when the arm is lifted, decreased blood flow, puncture difficulties, increased negative arterial pressure.
If the patient needs to evaluate the function of the arteriovenous endovascular fistula, it is recommended to go to a regular hospital and consult a specialized nephrologist and vascular access physician.