Which statement is incorrect regarding the Doppler waveform shapes?

The presence of a dicrotic notch is not inherently indicative of disease; instead, it is a normal physiological feature that can be observed in healthy individuals. The dicrotic notch represents the brief backflow of blood into the heart during diastole due to the closure of the aortic valve. In healthy Doppler waveforms, this notch is a characteristic feature and reflects normal cardiac function.

Understanding the other statements helps clarify why they are accurate: Doppler waveforms typically display distinct sharp wave patterns that are associated with the characteristics of blood flow in vessels. Also, abnormalities in these waveforms can indicate the presence of changes in hemodynamics, such as alterations in velocity or flow direction, which often accompany vascular diseases. Additionally, the presence of stenosis can significantly affect the shape and amplitude of Doppler waveforms, usually presenting them as flattened or disturbed due to turbulent flow, providing useful diagnostic information regarding vascular health.