Venae cavae flow pattern in cats: as studied with high-speed cinefluorographic technique

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Abstract
Movements of Lipiodol droplets were studied in the venae cavae of cats by high-speed cinefluorography at 260 frames/sec. Oscilloscopic tracings of simultaneous cardiac events were recorded on the same movie film. Droplets in the inferior vena cava flowed two to three times faster than in the superior vena cava. The flow pattern of these droplets in the superior vena cava changed between tachycardia and bradycardia, in that they moved predominantly with ventricular systole during tachycardia but moved both in ventricular systole and diastole during bradycardia. No appreciable change was noted in the inferior vena cava between tachycardia and bradycardia.