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The estimation of blood flow to hemodialyzers by bubble time
Proceedings of the Clinical Dialysis and Transplant Forum
|November 19, 1976
Abstract:
Reliable estimation of blood flow to hemodialyzers is essential to the accurate prescription of therapy. Customarily an air bubble is timed as it traverses a racetrack of known volume and blood flow is calculated from the formula Qb (ml/min) = (volume/BT) (60 sec/min). The linearity of this relationship has recently been questioned. Air bubble velocities were statistically fit to measured blood flows over 6 hematocrit values. From the resulting relationship, Qb (ml/min) = 62 (vol/L) (L/BT)0.96, one can generate a table relating velocity to flow for clinical use.