Trace venous pressure from valve failure to skin injury, distinguish arterial and lymphatic disease, and choose safe compression, wound care, and referral.
An ankle can swell because blood cannot return, because lymph cannot drain, or because the whole circulation is congested. A brown, itchy ankle with evening heaviness suggests venous hypertension. It does not establish that strong compression is safe.
Ask two separate questions. What is raising venous pressure, and is arterial inflow adequate?
Why standing exposes the problem
The calf muscles compress deep veins during walking. Competent valves limit backward flow as the muscles relax. With reflux, obstruction, an ineffective calf pump, or a combination, pressure fails to fall normally during ambulation. This sustained ambulatory venous hypertension is the mechanism connecting aching, edema and skin injury. Chronic venous disease spans small visible veins through ulcers; chronic venous insufficiency usually refers to the more advanced functional disease with edema or tissue changes. [1]
Superficial compartment
Skin and subcutaneous veins → great or small saphenous vein → deep veins at the saphenous junctions.
Across the fascia
Perforating veins connect superficial and deep systems. Normal lower-leg flow is predominantly inward. Incompetent perforators can transmit pressure outward toward skin.
Read from the skin toward the deep return route. The great saphenous vein passes anterior to the medial malleolus and joins the common femoral vein in the groin. The small saphenous vein passes behind the lateral malleolus and commonly joins the popliteal vein; its termination varies. This is a flow map, not a drawing to scale. [1]
Reflux and obstruction require different questions
Primary valve and vein-wall dysfunction can produce reflux without a previous clot. After DVT, residual obstruction and valve injury can coexist as post-thrombotic syndrome. The original clot need not disappear completely for chronic symptoms to develop. Reduced ankle mobility, prolonged immobility and obesity can further impair return. Pregnancy and family history also matter when assessing varicose disease. [1][9]
Proximal obstruction deserves attention when swelling involves the whole limb, venous claudication produces tight bursting discomfort during exertion, or suprapubic collateral veins appear. Classic May-Thurner anatomy places the left common iliac vein between the right common iliac artery anteriorly and the spine posteriorly. Compression on imaging can be incidental. A symptomatic syndrome requires clinical correlation, and a stent is not automatic. [11][12]
Try it here · Checkpoint 1 of 3
Make your prediction before reading the choices. A first attempt is just a starting point.
Case 2
Show answer and explanations for case 2
A. Recurrent acute DVT (Why this does not fit)
The study has no acute thrombus, and the symptoms have a stable chronic pattern rather than a new change.
B. Primary lymphedema alone (Why this does not fit)
The documented post-thrombotic venous abnormalities explain the pattern, although lymphatic overload may coexist.
C. Systemic cardiac congestion alone (Why this does not fit)
A systemic cause is less consistent with isolated ipsilateral disease and the demonstrated local abnormalities.
D. Post-thrombotic syndrome (Best answer)
Prior ipsilateral DVT can leave both obstructive scarring and valve dysfunction, as demonstrated here.
Takeaway: Post-thrombotic disease can involve reflux and obstruction together.
Heaviness, aching or itching accumulates with dependency and prolonged standing. Raising the leg and activating the calf pump often help. Edema, varicosities and brown gaiter-region pigmentation support venous hypertension. Ulcers commonly occur near the medial ankle, with shallow irregular edges and exudate. They can be substantially painful. Location or pain alone does not settle the cause. [1]
Arterial pattern
Reproducible calf discomfort with exertion that resolves after stopping suggests claudication. Ischemic rest pain, a cool foot, impaired pulses, or a distal wound warrants arterial assessment. Raising a severely ischemic foot can worsen pain. A venous-looking ulcer can coexist with PAD, and palpable pulses do not prove adequate wound perfusion. [3]
Lymphatic pattern
Dorsal foot and toe involvement, tissue thickening and inability to pinch skin at the second toe support lymphedema. Early disease can pit and improve with limb raising. Later fibrosis may eliminate pitting. Chronic venous hypertension can overload lymphatic drainage, creating combined disease, so these are not mutually exclusive boxes. [7]
Do not let an old diagnosis explain a new event
Stable post-thrombotic swelling is different from a new increase over hours or days. New unilateral swelling, deep tenderness or an acute change after immobilization requires a DVT probability assessment. D-dimer helps exclude DVT in selected low-probability patients; it is not a test for chronic reflux. A previous DVT does not protect against another one. [4]
Bilateral edema also calls for a medication review and a search for systemic disease. Dyspnea, jugular venous distention or pulmonary findings support cardiac congestion; substantial proteinuria and low albumin support renal protein loss. The absence of dyspnea alone excludes neither. Acute erythema, fever or spreading tenderness deserves assessment for infection, while a painful palpable superficial cord suggests superficial venous thrombosis. [1][2]
Map return flow and measure inflow
Venous duplex answers where flow reverses and where return is obstructed. A reflux examination usually uses standing positioning if feasible. Valsalva or augmentation can assess proximal segments; distal compression and release assess more distal segments. B-mode compression images evaluate deep-vein patency, while spectral Doppler measures flow direction and duration. A study ordered only to exclude acute DVT may not provide the full reflux map needed for intervention. [2]
Superficial truncal reflux
More than 0.5 seconds of reversed flow in the great or small saphenous vein meets the guideline reflux threshold.
Major proximal deep-vein reflux
More than 1 second is the threshold in the common femoral, femoral and popliteal veins. The 0.5-second rule is not universal.
Vein diameter alone does not diagnose reflux. If the history suggests iliac obstruction, extend imaging proximally; CT or MR venography and selected intravascular ultrasound answer questions that routine lower-leg ultrasound may not resolve. Historical tourniquet maneuvers such as Brodie-Trendelenburg are not adequate procedural maps. Use duplex to localize superficial, perforator and deep disease. [1][2]
ABI answers a different question. It compares ankle with brachial systolic pressure. Report ≤0.90 as abnormal, 0.91-0.99 as borderline, 1.00-1.40 as normal, and >1.40 as noncompressible. Persistent exertional symptoms with a normal or borderline resting ABI may require exercise ABI. A noncompressible result, especially with diabetes or kidney disease, calls for toe pressure or toe-brachial testing rather than reassurance. [3]
An ABI number by itself does not diagnose chronic limb-threatening ischemia. That diagnosis combines PAD with chronic ischemic rest pain, nonhealing tissue loss or gangrene and objective perfusion assessment. New motor or sensory loss with a cold painful limb is an emergency, not an outpatient reflux assessment. [3]
The skin records sustained pressure
Venous hypertension promotes capillary leakage and inflammation. Extravasated erythrocytes break down; iron stored as hemosiderin contributes to brown pigmentation. Inflammatory injury involves more than pigment deposition alone. Lipodermatosclerosis is fibrosis of skin and subcutaneous tissue that can narrow the lower leg into an inverted champagne-bottle contour. An inflammatory flare can be tender and warm, so lack of fever is not a complete diagnostic test. [1]
C0-C2
C0 has no visible or palpable venous signs. C1 has telangiectasias, usually less than 1 mm, or reticular veins about 1-3 mm. C2 has varicose veins, generally at least 3 mm in diameter when upright.
C3
Venous edema. Pigmentation is already a C4 finding.
C4a-C4c
C4a is pigmentation or eczema. C4b is lipodermatosclerosis or atrophie blanche. C4c is corona phlebectatica, a fan of small intradermal veins around the ankle or foot.
C5 and C6
C5 is a healed venous ulcer. C6 is an active venous ulcer. Recurrent active ulceration may be recorded as C6r.
CEAP records clinical, etiologic, anatomic and pathophysiologic information. In basic clinical classification, use the highest applicable class for each limb. A healed right ulcer does not make a left leg with edema C5. The classes describe findings; they are not an inevitable sequence through which every patient passes. [1]
Atrophie blanche describes porcelain-white atrophic skin with surrounding small vessels and pigmentation. It is not automatically proof of a previous venous ulcer. Similar scars can occur with other disorders, including livedoid vasculopathy; an atypical painful lesion needs reconsideration of the diagnosis. An actual documented healed ulcer takes precedence as C5. [1][14]
Stasis dermatitis often causes chronic itch and scale. Treat impaired return and protect the skin with emollients; a clinician-directed short course of topical corticosteroid can calm eczema. New sharply patterned itch after a dressing or cream suggests superimposed contact allergy. Neither that rash nor stable brown pigmentation is an automatic indication for antibiotics. [8]
Try it here · Checkpoint 2 of 3
Make your prediction before reading the choices. A first attempt is just a starting point.
Case 20
Show answer and explanations for case 20
A. C6 on the right because any previous ulcer remains active (Why this does not fit)
C6 requires current active ulceration.
B. Right C5 and left C4a (Best answer)
Stage each limb by its highest applicable finding; the healed right ulcer and left eczema differ.
C. C3 for both because edema is bilateral (Why this does not fit)
Skin injury and ulcer history must not be discarded.
D. C5 for both because the patient has an ulcer history (Why this does not fit)
A finding on the right does not assign the same class to the left.
Takeaway: CEAP clinical class belongs to the limb being described.
Compression reduces edema and supports venous return. Graduated stockings apply the highest pressure distally, with less pressure proximally. Fit, arterial supply, sensation, skin integrity and the ability to apply the device matter as much as its printed pressure. Walking, ankle exercises and periodic leg raising support the calf pump and reduce dependency. Diuretics, aspirin and anticoagulants do not repair reflux; use them when there is a separate indication. [1][13]
Venous edema
For C3 disease or symptomatic post-thrombotic edema, 20-40 mmHg at the ankle is a guideline-supported range. Select a tolerable system and teach application. A 20-30 mmHg stocking is reasonable for many patients; 30-40 mmHg is not reserved exclusively for ulcers. [13]
Active venous ulcer with adequate inflow
Trained teams commonly use multilayer or inelastic systems targeting at least 40 mmHg at the ankle. Confirm perfusion and reassess comfort and tissue response. Wound compression and a routine hosiery prescription are not interchangeable. [1]
Mixed arterial and venous ulcer
ABI between 0.6 and 0.8 warrants specialist planning; the cited supportive evidence for modified compression requires ABI >0.6. Modified compression below 40 mmHg may be considered with close supervision when ankle pressure is >60 mmHg and toe pressure >30 mmHg. Avoid sustained compression with ABI <0.6, ankle pressure <60 mmHg or toe pressure <30 mmHg pending arterial assessment. [1]
New severe pain, numbness, pallor or tissue deterioration after application requires prompt reassessment and release of the compression. Severe heart failure with symptoms at rest (NYHA IV) is a contraindication to sustained compression. NYHA III disease requires clinical and hemodynamic monitoring if compression is used. Severe sensory neuropathy or microangiopathy with skin-necrosis risk also warrants specialist assessment before compression. An adjustable wrap or donning aid may make treatment practical for someone with limited hand strength. [1]
Distinguish symptom treatment from prevention claims. Stockings may help swelling after DVT, but ASH conditionally suggests against their routine use solely to prevent post-thrombotic syndrome, based on very-low-certainty evidence. This is distinct from treating existing edema or pain. Anticoagulation decisions still follow the DVT indication and recurrence risk. [10]
Heal the wound and address the pressure source
A venous ulcer needs appropriate compression, cleansing, an exudate-managing dressing that maintains a moist healing environment, and assessment of the reflux or obstruction driving it. Record size and progress. Reconsider inadequate perfusion, pressure, contact allergy, infection or another ulcer diagnosis when healing stalls. An atypical edge, unusual site or persistently unexplained nonhealing warrants specialist evaluation and possible biopsy. [1][15]
A positive swab does not diagnose infection. Colonization is common. Antibiotics are indicated for clinical infection, such as spreading erythema beyond the ulcer, increased warmth or pain, or fever. Routine initial swabbing is discouraged. If infection worsens or fails to respond, reassess and obtain an appropriately cleaned sample when indicated. Neither systemic antibiotics nor a mandatory silver, iodine or honey dressing follows automatically from a culture result. [5]
Referral is appropriate for symptomatic varicosities, venous skin changes, a healed ulcer, or an ulcer persisting beyond two weeks. Bleeding varicosities require immediate attention. Raise the leg and apply direct pressure to the bleeding site while obtaining help; definitive treatment is needed to reduce recurrence. [9]
For suitable symptomatic superficial axial reflux, endovenous treatment can be offered without forcing a three-month stocking trial. Thermal ablation closes a selected vein with heat; sclerotherapy injures its endothelium chemically to produce fibrotic closure. Anatomy, patient preferences and procedural risks guide selection. Deep reflux alone is not an absolute bar to superficial treatment, but an important collateral around deep obstruction must be preserved. [1][2]
EVRA enrolled adults with an ulcer present for six weeks to six months, ABI ≥0.8, and suitability for compression and superficial reflux ablation. Ablation within two weeks plus compression shortened median healing time from 82 to 56 days compared with deferred intervention. This supports assessment during ulcer treatment, not waiting for every ulcer to close first. These trial results are not a guaranteed healing date for an individual. Continue a recurrence-prevention plan after closure. [6]
For superficial thrombosis, duplex must establish length, proximity to the deep junction and any DVT. The following SVS/AVF/AVLS recommendations concern patients without recent superficial venous intervention; postprocedural thrombosis follows a separate pathway. Above-knee saphenous thrombosis >3 cm from the saphenofemoral junction and at least 5 cm long generally warrants 45 days of anticoagulation, such as fondaparinux 2.5 mg subcutaneously daily if suitable.
For main saphenous truncal thrombus at or within 3 cm of the saphenofemoral junction, this guideline gives a consensus statement supporting full-dose anticoagulation for at least six weeks, with specialist management; an isolated short distal tributary may permit symptom care and surveillance. [2]
Acute change or limb threat → urgent acute vascular pathway.
Stable dependency symptoms and skin injury → map reflux and assess inflow.
Adequate inflow → compression and skin or wound care, with timely venous referral.
Mixed disease, proximal obstruction or poor healing → specialist plan, not simply tighter bandaging.
Try it here · Checkpoint 3 of 3
Make your prediction before reading the choices. A first attempt is just a starting point.
Case 28
Show answer and explanations for case 28
A. Treat the ulcer with dressings alone while arranging ablation (Why this does not fit)
The trial tested early ablation with compression; dressings alone omit a central treatment component.
B. Early superficial reflux ablation alongside compression (Best answer)
EVRA compared early ablation plus compression with deferred intervention and found shorter time to healing.
C. Wait for complete healing before every venous intervention (Why this does not fit)
That mandatory delay conflicts with the trial-supported early approach in suitable patients.
D. Ablation without wound care or compression (Why this does not fit)
The trial evaluated combined care, not replacement of ulcer care with a procedure alone.
Takeaway: Treat suitable superficial reflux during active ulcer care.
A. Immediate thermal ablation of the inflamed great saphenous vein (Why this does not fit)
The guideline considers ablation after the acute inflammation resolves if pathological reflux persists.
B. Full-dose anticoagulation for proximal DVT (Why this does not fit)
The deep veins are patent and the thrombus is more than 3 cm from the junction; this uncomplicated category supports the 45-day prophylactic-dose regimen.
C. Fondaparinux 2.5 mg subcutaneously daily for 45 days (Best answer)
The clot is at least 5 cm long and more than 3 cm from the junction, fitting this recommended prophylactic-dose regimen.
D. Warm compresses alone because the thrombus is superficial (Why this does not fit)
Its length and truncal location make symptom care alone insufficient for this category.
Takeaway: SVT treatment depends on length and distance from the deep junction.
