baxter AK 98 - Page 98

Single needle - terminology
In single needle the patient’s blood is removed from, and returned to, the single
access point in a cycle with two phases;
• The Arterial phase. The venous blood line is clamped, and blood is withdrawn
from the patient into the arterial blood line. The pressure and volume in the
circuit increases.
• The Venous phase. The arterial blood line is clamped, and the blood that
entered in the arterial phase is returned to the patient via pressure and gravity.
Single needle parameters;
• Mean blood flow. Is the effective mean blood flow rate during the complete
cycle.
• Stroke volume. Is the blood volume which passes through the dialyzer during
a cycle. The higher the stroke volume the more efficient the treatment.
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