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When aspirating through the distal access catheter (DAC), maximal laminar flow is highest in the catheter center of the catheter's cross-sectional area ( a ). A microcatheter in the lumen of the DAC markedly reduces flow rates ( b ), particularly when it protrudes through the DAC tip. When the microcatheter is removed, only the delivery wire remains in the DAC lumen and flow rates are improved ( c ).
