Clinical Vascular Examination and Physiologic Testing
Clinical vascular examination and physiologic testing as the first triage step in suspected peripheral artery, carotid, aneurysmal, and venous disease. The chapter frames history, inspection, pulses, ABI, segmental pressures, and the laboratory request so the right patient enters the right pathway.
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General medical education, not patient-specific advice.
Choose an audio editionClinical assessment and indications
Peripheral artery disease () prevalence rises from approximately 5% in middle-aged adults to more than 18% among the oldest groups in high-income cohorts . It shares major atherosclerotic risk factors with coronary and cerebrovascular disease, predominantly smoking, diabetes mellitus, hypertension, and dyslipidaemia.
Evaluation begins with a targeted history and structured bedside examination. Symptomatic presentation ranges from classic intermittent to atypical exertional symptoms, walking impairment without recognized claudication, , or tissue loss. History assessment evaluates walking distance, pace, grade, reproducibility, relief with rest, prior interventions, and whether symptoms are limited by hip, knee, back, or pulmonary disease .
Clinical examination features include:
- , pallor on elevation, and trophic skin changes.
- Ulceration, tissue loss, deformity, and temperature asymmetry.
- Assessment of bilateral femoral, popliteal, dorsalis-pedis, and posterior-tibial pulses, and auscultation for femoral bruits.
- Identification of conditions that render arteries noncompressible, particularly advanced age, diabetes, and end-stage renal disease .
Targeted resting physiologic testing is indicated when history or examination suggests PAD, and as case finding for adults aged 65 years and older, or aged 50 years and older with a history of diabetes or smoking. Population-wide testing in asymptomatic adults without atherosclerotic risk factors is not indicated .
Men aged 65 to 75 years with any smoking history receive concurrent one-time abdominal ultrasound screening for abdominal aortic , defined as an aortic diameter >= 3.0 cm .
Ankle-brachial index and interpretation
The resting () is calculated by dividing the highest ankle systolic pressure (dorsalis pedis or posterior tibial) by the higher of the two brachial systolic pressures. Measurements are obtained supine using a manual Doppler, assessing both arms and both ankles .
Bilateral arm pressure measurement is mandatory. An interarm systolic pressure difference of >= 10 mmHg is associated with PAD. A difference of >= 15 mmHg indicates high cardiovascular risk and is associated with subclavian , cerebrovascular disease, and increased all-cause mortality. Using the higher brachial pressure prevents false elevation of the ABI by occult proximal upper-extremity disease .
Diagnostic categories for the resting ABI are defined as follows:
- 1.00 to 1.40: Normal.
- 0.91 to 0.99: Borderline.
- <= 0.90: Abnormal, diagnostic of PAD.
- > 1.40: Noncompressible, indicating medial arterial calcification and an unreliable index .
An abnormal ABI (<= 0.90) and a high ABI (> 1.40) are both associated with approximately doubled 10-year all-cause and cardiovascular mortality compared to the normal range . Both values establish high systemic risk and warrant secondary prevention targeting smoking cessation, body mass index, physical activity, diet, total cholesterol, blood pressure, and fasting plasma glucose .
Physiologic rescue and localisation testing
When the resting ABI is nondiagnostic, unreliable, or discordant with symptoms, secondary physiologic tests confirm the diagnosis and localise disease.
Toe pressure and toe-brachial index. Report absolute systolic toe pressure (TP) in mmHg and the toe-brachial index () separately. TP is measured with a small toe cuff and a Doppler or optical flow detector after rest; TBI divides TP by brachial systolic pressure. Digital arteries are less often noncompressible, not immune to technical failure. Prior toe/forefoot amputation can prevent measurement .
Absolute TP
- TP <30 mmHg indicates severe ischemia
- it is not by itself a diagnosis of CLTI.
TBI with waveform
- Complements ABI when ankle arteries are noncompressible
- ESVS 2024 describes TBI <0.7 as abnormal.
Exercise ABI
- For exertional symptoms with nondiagnostic resting ABI
- report the protocol and measurement timing.
TcPO2 or skin perfusion pressure
- Adds information in suspected CLTI when pressure indices are inadequate
- does not replace wound and infection assessment.
ESVS 2024 supports TP/TBI for suspected PAD despite normal or inconclusive ABI (IIa, B); ACC/AHA 2024 recommends exercise ABI for exertional nonjoint symptoms with normal/borderline ABI (1, B-NR). These pathways differ in emphasis and should not be collapsed into a mandatory TBI-first rule .
CLTI and exercise thresholds. CLTI combines PAD with ischemic rest pain, , or persistent ulceration; pressure values quantify ischemia within that clinical syndrome, rather than creating rigid separate diagnostic cutoffs for rest pain and every wound . The ESVS exercise recommendation specifies an ABI fall of at least 20% or an ankle-pressure decrease >30 mmHg; a 20% ankle-pressure fall is not the same criterion .
Segmental pressures and waveforms. Multilevel cuffs (high-thigh, low-thigh, calf, ankle) localise disease prior to anatomic imaging. An adjacent-cuff systolic pressure gradient of >= 20 mmHg indicates haemodynamically significant disease at the intervening segment. Pulse-volume recordings provide morphological waveform data that complement pressure readings, particularly when noncompressible vessels yield falsely elevated segmental pressures. High-thigh cuff artefact and bilateral inflow disease can confound interpretation .
Diagnostic logic and imaging selection
Anatomic imaging is a revascularization planning tool, not a first-line diagnostic reflex. It is pursued once physiologic testing confirms PAD and the severity of symptoms or tissue loss warrants intervention .
For revascularization candidates, and computed tomography angiography () are first-line modalities. Magnetic resonance angiography () is used when renal function or cumulative radiation exposure precludes CTA. Catheter angiography is reserved for concurrent endovascular intervention or when noninvasive imaging fails to resolve the anatomy .
- Measure the resting ankle-brachial index first, substituting the toe-brachial index when the ankles are noncompressible (suspected medial calcification).
- Obtain segmental pressures with Doppler waveforms or pulse-volume recordings to localise the level of disease.
- Add exercise or post-occlusive testing when resting indices are normal but symptoms persist.
- Proceed to duplex ultrasound, then to cross-sectional CTA or MRA or catheter angiography, only when intervention is planned.
Physiologic testing logic and rescue pathways
- Diagnostic threshold or trigger
- Resting ABI <= 0.90
- Recommended action
- Diagnose PAD, initiate cardiovascular risk reduction, and manage symptoms
CitationExertional nonjoint symptoms with normal resting ABI
- Diagnostic threshold or trigger
- Resting ABI 1.00 to 1.40
- Recommended action
- Perform exercise ABI; use the stated laboratory protocol and distinguish an ABI percentage fall from an ankle-pressure fall in mmHg
CitationExertional nonjoint symptoms with borderline resting ABI
- Diagnostic threshold or trigger
- Resting ABI 0.91 to 0.99
- Recommended action
- Exercise ABI is the ACC/AHA pathway; TP/TBI is an additional option when pressure reliability or persistent clinical suspicion warrants it
CitationSuspected medial calcification (DM, ESRD, age)
- Diagnostic threshold or trigger
- Resting ABI > 1.40 (noncompressible)
- Recommended action
- Perform TBI; diagnose PAD if TBI <= 0.70
CitationPhysiologically confirmed PAD with limiting symptoms
- Diagnostic threshold or trigger
- Candidate for revascularization
- Recommended action
- Plan anatomic imaging with duplex ultrasound, CTA, or MRA
Citation
Areas of controversy
Thresholds for segmental limb pressure gradients vary among accredited vascular testing facilities; while >= 20 mmHg is the standard criterion for a haemodynamically significant lesion, some laboratories validate and use a >= 30 mmHg threshold to prioritize diagnostic specificity .
Exercise ABI relies heavily on protocol standardization. Standardised treadmill protocols (e.g., Gardner-Skinner) are well validated, but timing of post-exercise measurement and the use of alternative provocation strategies (such as reactive hyperaemia or active pedal plantarflexion for patients with severe limitations) can alter the magnitude of the measured haemodynamic drop .
Nomenclature frameworks remain in transition. Historical classification languages, particularly TASC II lesion categories and the term "", permeate historical reports but are superseded by contemporary diagnostic pathways, physiologic thresholds, and current society guidelines .
Further reading
- Ankle brachial index combined with Framingham Risk Score to predict cardiovascular events and mortality: a meta-analysis. (2008). Historical synthesis of ABI prognostic value; does not establish modern diagnostic cutoffs.
References
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2024 ACC/AHA/AACVPR/APMA/ABC/SCAI/SVM/SVN/SVS/SIR/VESS Guideline for the Management of Lower Extremity Peripheral Artery Disease: A Report of the American College of Cardiology/American Heart Association Joint Committee on Clinical Practice Guidelines. 2024. doi:10.1161/CIR.0000000000001251. PMID:38743805.
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- 5.2016 AHA/ACC Guideline on the Management of Patients With Lower Extremity Peripheral Artery Disease.PubMed-indexed articleClinical practice guideline2016
2016 AHA/ACC Guideline on the Management of Patients With Lower Extremity Peripheral Artery Disease. doi:10.1016/j.jacc.2016.11.007.
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