Triphasic Waveform in Ankle-Brachial Index (ABI) Test

Clinical Significance of Triphasic Waveforms

The American College of Cardiology recommends that the presence of triphasic pedal Doppler arterial waveforms is one of the tests that largely excludes PAD, indicating healthy, elastic arterial walls with normal compliance 1
The presence of triphasic waveforms is considered a reliable indicator of normal arterial flow even when other measurements may be ambiguous, with a strong evidence level 1, 3
Triphasic waveforms provide stronger evidence for the absence of PAD than some other measurements, and when combined with normal ABI values (0.9-1.3), significantly increase confidence in ruling out PAD 1, 3

The American College of Cardiology states that triphasic waveforms can be used as a criterion for control subjects in studies evaluating PAD diagnostic methods, providing a high level of confidence in the diagnosis 4
The combination of ABI measurement with Doppler waveform assessment improves diagnostic accuracy, according to the American College of Cardiology 3, 8

Normal ABI values (1.00-1.40) with triphasic waveforms strongly indicate absence of significant arterial disease, as recommended by the American College of Cardiology 3, 5
Even when ABI values are borderline (0.91-0.99), the presence of triphasic waveforms suggests normal arterial flow, with a moderate level of evidence 3, 6

The American College of Cardiology recommends Doppler waveform analysis, including identification of triphasic patterns, as part of the initial assessment for PAD, with a high level of evidence 3, 7
Waveform analysis can detect PAD even when ABI values are falsely normal due to arterial calcification, providing a valuable diagnostic tool 9

When triphasic waveforms are present, clinicians can be reasonably confident in excluding significant PAD, according to the American College of Cardiology, with a high level of evidence 1, 2
In patients with exertional leg symptoms but triphasic waveforms, alternative diagnoses should be considered, as recommended by the American College of Cardiology 8