What is the recommended next step in management for a patient whose lower‑extremity duplex ultrasound shows triphasic waveforms and no hemodynamically significant arterial stenosis?

Management of Normal Lower Extremity Duplex Ultrasound in PAD Evaluation

In a patient with triphasic waveforms and no hemodynamically significant stenosis on lower extremity duplex ultrasound, the next step is to focus on aggressive cardiovascular risk factor modification with guideline-directed medical therapy (GDMT), establish longitudinal clinical follow-up with routine assessment of limb symptoms and functional status, and coordinate multidisciplinary care—no further vascular imaging or intervention is indicated at this time. 1

Immediate Management Priorities

Medical Therapy Optimization

• Initiate or optimize GDMT to prevent major adverse cardiovascular events (MACE) and major adverse limb events (MALE), which is a Class I recommendation for all patients with PAD regardless of revascularization status 1
• Target aggressive lipid management (LDL <3.1 mmol/L), smoking cessation if applicable, and optimized antithrombotic therapy with clopidogrel as the preferred antiplatelet agent 2
• The absence of hemodynamically significant stenosis does not eliminate cardiovascular risk—these patients still require comprehensive atherosclerotic disease management 1

Clinical Follow-Up Structure

• Establish longitudinal follow-up with routine clinical evaluation including assessment of limb symptoms, functional status, lower extremity pulse examination, and foot assessment 1
• Periodic assessment of functional status and health-related quality of life should be incorporated as a standard component of ongoing care 1
• Coordinate care among clinicians to improve management of PAD and comorbid conditions (diabetes, hypertension, dyslipidemia) 1

When to Repeat Imaging

Surveillance Imaging Is NOT Routinely Indicated

• In patients without prior revascularization and no new symptoms, routine surveillance duplex ultrasound is not recommended 1
• The current study shows normal hemodynamics (triphasic/biphasic waveforms, no significant stenosis), which does not warrant scheduled repeat imaging in the absence of clinical change 3, 4

Indications for Repeat Duplex Ultrasound

• New or worsening lower extremity symptoms (claudication, rest pain, tissue loss) 1
• Development of absent or diminished pulses on physical examination 1
• Decline in functional status or walking distance 1
• If the patient subsequently undergoes revascularization, then structured surveillance protocols apply (within 1-3 months post-procedure, then at 6 and 12 months, then annually) 1

Clinical Context and Interpretation

Understanding the Duplex Findings

• Triphasic waveforms indicate normal arterial flow patterns without significant upstream stenosis 3, 5
• The bilateral nature of preserved waveforms (right side triphasic through distal SFA, left side biphasic but without stenosis) suggests no focal hemodynamically significant lesions 6
• Peak systolic velocities (PSV) in the range documented (CFA 113-131 cm/s, SFA 107-126 cm/s) are within normal limits and do not meet criteria for stenosis 7, 5
• Absence of significant calcific plaque further supports the lack of advanced atherosclerotic disease requiring intervention 3

Common Pitfalls to Avoid

• Do not pursue angiography or intervention based solely on imaging without corresponding clinical symptoms 1
• Do not neglect cardiovascular risk factor management simply because the duplex is normal—PAD is a systemic atherosclerotic disease marker 1, 2
• Do not schedule routine surveillance imaging in asymptomatic patients without prior revascularization—this represents unnecessary healthcare utilization 1

Multidisciplinary Coordination

• Coordinate care among primary care, cardiology, and vascular specialists to ensure comprehensive management of atherosclerotic risk factors and comorbidities 1
• Consider telehealth as an alternative mode for vascular evaluation and longitudinal follow-up, provided it is consistent with the urgency of presenting symptoms 1