“…Eff ort should mainly be made to recognise the early manifestations in order to treat the fi stula in time. A number of methods are recommended: physical examination of the site 24 , digital plethysmography of the arm periphery 24,25,33 , skin temperature monitoring 24 , periphery oxygenation measurement 24 , digital pressure measurements 37 , vessel bundle fl ow rate assessment by colour duplex sonography 33 or arteriography of the entire fi stula bed with or without fi stula compression 25,33 . The fi stula fl ow rate, however, does not typically infl uence steal development.…”