In arterial Doppler assessment, what can biphasic waveforms indicate?

Biphasic waveforms in arterial Doppler assessments are indicative of moderately altered arterial flow. In a healthy, normal arterial circulation, one typically expects to see a triphasic waveform, reflecting the rapid acceleration, deceleration, and reversal of flow that accompanies the cardiac cycle.

When a biphasic waveform is present, it suggests that there is some degree of compromise to the arterial flow, such as moderate arterial disease. This alteration in flow pattern often results from factors like stenosis or other forms of vascular obstruction that lead to disturbed hemodynamics. While still showing some level of pulsatility, biphasic waveforms lack the full triphasic characteristics, which can be seen in patients with more severe conditions causing significant obstruction—these typically present with monophasic waveforms.

Therefore, recognizing a biphasic waveform is critical as it often serves as an early warning sign of developing vascular issues, highlighting the need for further evaluation or management to prevent progression to more severe arterial diseases.