First step is to make sure the venous side is actually the venous side. Do this when the patient is running on the machine with BFR as prescribed. With your fingers, occlude the AVG in the middle of the loop. If the machine alarms, you know you have your sides reversed. If it runs, then you are correct and the patient needs intervention. You did not mention what the bruit sounded like, but did mention high venous pressures as a usual occurrance. Pay close attention to the quality and pitch of the bruit. A high pitch or change in quality is a warning sign and should be reported immediately. Hope this helps!