Analysis of thoracic duct flow waves using fast Fourier transform in sheep

We measured the lymph flow of the thoracic duct using an ultrasound transit -time flowmeter and then analyzed the obtained flow signals by fast Fourier transform. We found that the wave form included a low frequency component (similar to 0.1 Hz) as well as high frequency components which represented cardiac pulsation and respiratory movement. The low frequency component sig nified an intrinsic thoracic duct pulsation. When venous outflow pressure w as increased, the frequency of the thoracic duct pulsation increased, where as the frequencies of cardiac pulsation and respiratory movement were uncha nged. These findings suggest that thoracic duct pulsation is independent of cardiac pulsation and respiratory movement.