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. 2007 Sep;1(3):311–319.

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© 2007 Dove Medical Press Limited. All rights reserved

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At baseline. (a) Doppler waveform without lemon stimulation: control population. High systolic peak and a prominent following compliance peak, followed by a low diastolic flow (RI = 0.88). (b) Doppler waveform with lemon stimulation: control population. Physiologic changes in vasculature when parotid gland is stimulated in controls. Level of systolic and diastolic flow is increased (RI = 0.91). (c) Doppler waveform in patient population without stimulation. We noted a decreased impedance in parotid vessels with a decrease RI (RI = 0.77). (d) Doppler waveform with lemon stimulation: patients. The waveform profile is the same before and after stimulation.