A duplex scanner is used for noninvasive and semiquantitative flow measurement of Cimino-shunts. Normal venous shunt flow was in 12 chronic shunts 15.2 +/- 3.9 ml/sec and 3 fresh shunts 7.3 +/- 1.8 ml/sec. A noninvasive diagnosis of hemodynamically significant shunt stenoses seems to be possible. Therefore an early and routinely examination of shunts by means of a duplex scanner ist recommended.
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