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Fig. 16B. —68-year-old asymptomatic woman with percussive waves because
of temporal tap maneuver. Spectral Doppler sonography tracing obtained during
temporal tap (T) shows internal carotid artery. Changes produced by tapped
percussions are evident in internal carotid artery and external carotid artery
tracings and therefore have been transmitted around carotid bulb. It is
important to examine both carotid vessels under consideration. If these
perturbations are found in only one of two vessels in question, that vessel is
always external carotid artery. When percussive waves are detected in both
vessels, waves are sharper and of higher amplitude in external carotid artery
in 74% of cases.
