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Surgery - Assessment of peripheral vascular disease
Placement and examination The patient ought to be assessed in a heated setting while at rest. Ensure to assess the pulse and blood pressure, inspect the belly for aneurysms and scars, and conduct a comprehensive cardiovascular examination, including all peripheral pulses, heart sounds, and carotid auscultation.
Examine the leg in the supine position, subsequently elevated (passively), and ultimately in a dependent position. Fully expose the leg, encompassing the foot or hand, to facilitate a comprehensive examination and eliminate any bandages. The patient should be assessed in an upright position for venous disease. During supine examination,
observe the following:
Appearance Are there any regions with confirmed skin necrosis (dry gangrene, such as the tips of fingers or toes, interdigital spaces, or the heel of the foot)? Are there alterations in chronic venous stasis (such as varicosities, venous dermatitis, lipodermatosclerosis, or leg ulcers)?
Color - Waxy white indicates critical or acute ischaemia; blue and mottled coloration denotes potentially irreversible acute ischaemia; dark red or purple signifies chronic ischaemia.
Color alterations occur with positional modifications. Observe the angle at which the skin of the limb becomes pale when lifted passively (Buerger’s test). Normal extremities may have no blanching whatsoever. An angle of 15° or less indicates significant ischaemia. Observe the occurrence and latency of color change when the limb is in a dependent position. Ischaemic limbs gradually assume a vivid scarlet hue (reactive hyperaemia).
Ulcers-What is the site (digital or pedal) indicative of arterial disease? Ensure to examine the areas between the toes and fingers, as well as the plantar surface of the foot, particularly in cases of diabetes.
• Examination of venous structures. Assist the patient in standing upright. Examine for varicose veins. Are they located within the long saphenous or short saphenous distribution?
Palpation
• Temperature. Is the skin seen as chilly or warm? Is there a transitional phase? Compression and filling of skin capillaries. The standard is 2 seconds or fewer. A delay over 5 seconds indicates markedly diminished perfusion.
• Peripheral pulsations. Commence with the most proximal (major) vessels and go distally. Document whether the pulse is normal (++), diminished (+), or missing (–). Document any discernible excitement.
• In venous pathology, assessments of venous competence may be conducted (% Varicose veins). Surgical grafts. Examine the pathway of any surgical grafts and document the existence or nonexistence of pulses. Auscultation Assess for bruits. Are there bruits in the proximal vessels indicative of stenosis?
Inquiries Handheld Doppler (at the bedside), followed by Duplex ultrasound or CT angiography, are the primary modalities for examining vascular disease.
Portable Doppler ultrasonography • A simple and portable "bedside" assessment for preliminary evaluation. • used to: • Verify the existence of flow within a vessel or graft. • Assess the ankle-brachial pressure index (ABPI). Assess the existence of venous reflux.
Duplex Ultrasound (USS) • Integrates two-dimensional (2D) ultrasound imaging with Doppler-derived flow, shown in color and superimposed in real time. • Arterial duplex: utilized for the evaluation of stenoses and occlusions. Venous duplex: utilized for evaluating reflux or thrombosis in deep and superficial veins.
Computed Tomography Angiography Requires a multi-slice rapid acquisition ('helical'/'spiral') scanner. Images obtained during the arterial and/or venous phase following intravenous contrast administration.
Three-dimensional (3D) reconstruction facilitates the generation of 'virtual angiogram' images. This process is rapid, non-invasive, and comparatively safe. Utilizes iodinated contrast, which is nephrotoxic (relatively contraindicated in renal impairment) and poses a minor risk of allergic reaction. The presence of vessel wall calcification may hinder the visibility of the lumen.
Digital subtraction angiography (DSA) involves X-ray imaging subsequent to the injection of contrast material into the target vessel, effectively eliminating background structures (such as bone) to render the vessel lumen in black. This technique is primarily employed when endovascular intervention is necessary during the same procedure or when prior investigations yield inconclusive results. It is an invasive procedure that necessitates arterial puncture, which carries inherent risks, including the potential for false aneurysm or retroperitoneal hemorrhage associated with groin puncture. • Necessitates iodinated contrast, necessitating vigilance in cases of renal impairment and allergies.
Magnetic resonance angiography produces images of the arterial network by detecting arterial flow throughout the scanning process. • Safe and non-invasive: does not necessitate iodinated contrast, typically employing gadolinium to accentuate circulating blood. • Often overestimates the extent of stenosis due to the underrepresentation of very low flow.
Placement and examination The patient ought to be assessed in a heated setting while at rest. Ensure to assess the pulse and blood pressure, inspect the belly for aneurysms and scars, and conduct a comprehensive cardiovascular examination, including all peripheral pulses, heart sounds, and carotid auscultation.
Examine the leg in the supine position, subsequently elevated (passively), and ultimately in a dependent position. Fully expose the leg, encompassing the foot or hand, to facilitate a comprehensive examination and eliminate any bandages. The patient should be assessed in an upright position for venous disease. During supine examination,
observe the following:
Appearance Are there any regions with confirmed skin necrosis (dry gangrene, such as the tips of fingers or toes, interdigital spaces, or the heel of the foot)? Are there alterations in chronic venous stasis (such as varicosities, venous dermatitis, lipodermatosclerosis, or leg ulcers)?
Color - Waxy white indicates critical or acute ischaemia; blue and mottled coloration denotes potentially irreversible acute ischaemia; dark red or purple signifies chronic ischaemia.
Color alterations occur with positional modifications. Observe the angle at which the skin of the limb becomes pale when lifted passively (Buerger’s test). Normal extremities may have no blanching whatsoever. An angle of 15° or less indicates significant ischaemia. Observe the occurrence and latency of color change when the limb is in a dependent position. Ischaemic limbs gradually assume a vivid scarlet hue (reactive hyperaemia).
Ulcers-What is the site (digital or pedal) indicative of arterial disease? Ensure to examine the areas between the toes and fingers, as well as the plantar surface of the foot, particularly in cases of diabetes.
• Examination of venous structures. Assist the patient in standing upright. Examine for varicose veins. Are they located within the long saphenous or short saphenous distribution?
Palpation
• Temperature. Is the skin seen as chilly or warm? Is there a transitional phase? Compression and filling of skin capillaries. The standard is 2 seconds or fewer. A delay over 5 seconds indicates markedly diminished perfusion.
• Peripheral pulsations. Commence with the most proximal (major) vessels and go distally. Document whether the pulse is normal (++), diminished (+), or missing (–). Document any discernible excitement.
• In venous pathology, assessments of venous competence may be conducted (% Varicose veins). Surgical grafts. Examine the pathway of any surgical grafts and document the existence or nonexistence of pulses. Auscultation Assess for bruits. Are there bruits in the proximal vessels indicative of stenosis?
Inquiries Handheld Doppler (at the bedside), followed by Duplex ultrasound or CT angiography, are the primary modalities for examining vascular disease.
Portable Doppler ultrasonography • A simple and portable "bedside" assessment for preliminary evaluation. • used to: • Verify the existence of flow within a vessel or graft. • Assess the ankle-brachial pressure index (ABPI). Assess the existence of venous reflux.
Duplex Ultrasound (USS) • Integrates two-dimensional (2D) ultrasound imaging with Doppler-derived flow, shown in color and superimposed in real time. • Arterial duplex: utilized for the evaluation of stenoses and occlusions. Venous duplex: utilized for evaluating reflux or thrombosis in deep and superficial veins.
Computed Tomography Angiography Requires a multi-slice rapid acquisition ('helical'/'spiral') scanner. Images obtained during the arterial and/or venous phase following intravenous contrast administration.
Three-dimensional (3D) reconstruction facilitates the generation of 'virtual angiogram' images. This process is rapid, non-invasive, and comparatively safe. Utilizes iodinated contrast, which is nephrotoxic (relatively contraindicated in renal impairment) and poses a minor risk of allergic reaction. The presence of vessel wall calcification may hinder the visibility of the lumen.
Digital subtraction angiography (DSA) involves X-ray imaging subsequent to the injection of contrast material into the target vessel, effectively eliminating background structures (such as bone) to render the vessel lumen in black. This technique is primarily employed when endovascular intervention is necessary during the same procedure or when prior investigations yield inconclusive results. It is an invasive procedure that necessitates arterial puncture, which carries inherent risks, including the potential for false aneurysm or retroperitoneal hemorrhage associated with groin puncture. • Necessitates iodinated contrast, necessitating vigilance in cases of renal impairment and allergies.
Magnetic resonance angiography produces images of the arterial network by detecting arterial flow throughout the scanning process. • Safe and non-invasive: does not necessitate iodinated contrast, typically employing gadolinium to accentuate circulating blood. • Often overestimates the extent of stenosis due to the underrepresentation of very low flow.
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