Ultrasonic velocimetry in resection of renal arteriovenous fistulas and other intrarenal surgical procedures.

The Doppler velocimetry is considered to be useful frequently and indispensable occasionally for intrarenal surgery. Current equipment is relatively inexpensive, the operation is technically simple and maintenance is minimal. The instrument provides an instantaneous appraisal of the precise location of a blood vessel and some characteristics of blood flow with a facility unlikely to be achieved with any other technique. It is important that the limitations of current instruments be appreciated since the concepts of the procedure and current instrumentation are deceptively conductive to expectations beyond their capability.