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Related to valvular incompetence: Varicose veins
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They do not differentiate between obstruction and valvular incompetence, nor do they define the location or extent of valvular dysfunction.
Valvular incompetence can be confirmed with spectral and colour Doppler, and unlike photoplethysmography and air plethysmography, venous insufficiency can be localised to specific valve sites in the deep and superficial veins.
Valvular incompetence is diagnosed by demonstrating retrograde flow in response to the Valsalva manoeuvre or by manual compression proximal to the site of duplex examination.