Using a special probe holder, cross-sectional area and time-averaged mean spatial velocity of the internal jugular vein were measured by means of a duplex scanner and multiplied to calculate volume flow. In a cohort of 100 subjects ages 21 to 70 years, average right plus left flow was 740 ± 209 mlfmin. Flow was 8.7% lower in females than in males. Normalization of flow to 100 g I n an earlier paper 1 we proposed a method for ultrasonically assessing internal jugular venous flow (IJVF) through multiplication of mean cross-sectional area by time-averaged mean spatial velocity. With this technique area measurement was made using the planimetric system of a linear array scanner and velocity measurement by means of a single-gated pulsed wave Doppler device. A double-beam technique originally described by Peronneau et al 2 was used for angle determination.The present study was undertaken to find out whether the determination of IJVF based on ultrasonic area and velocity measurement could alternatively be accom· plished by means of a commercially available duplex scanner and, if so, how the values obtained compared with those measured with our earlier technique. It was anticipated that with such a method IJVF could be noninvasively investigated on a broader base, including pa· tients having cerebrovascular pathology.
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