Deep Vein Thrombosis – DVT
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- Deep Vein Thrombosis – DVT
Deep Vein Thrombosis (DVT) is the formation of a blood clot (thrombus) in the deep venous system, most commonly in the lower limbs (calf, popliteal, femoral, or iliac veins).
It is a major component of venous thromboembolism (VTE), which includes:
- Deep Vein Thrombosis (DVT)
- Pulmonary Embolism (PE)
DVT is clinically important because a clot can dislodge and travel to the lungs, causing PE, which may be life-threatening.
COMMON SITES:
- Popliteal vein
- Femoral vein
- Iliac Vein
- Rare- arm veins (upper limb DVT)
CAUSES AND RISK FACTORS:
DVT develops due to Virchow’s Triad:
A. Venous Stasis (Slow Blood Flow)
- Prolonged bed rest
- Long-distance travel
- Post-operative immobility
- Paralysis
- Heart failure
- Obesity
B. Endothelial Injury (Vein Wall Damage)
- Surgery (especially orthopedic)
- Trauma/fractures
- IV catheters
- Previous DVT
C. Hypercoagulability (Increased Clotting Tendency)
- Pregnancy and postpartum
- Oral contraceptive pills
- Hormone replacement therapy
- Cancer
- Smoking
- Dehydration
- Inherited thrombophilia (e.g., Factor V Leiden)
- Antiphospholipid syndrome
SIGNS/SYMPTOMS (Patient Complaints)
A. Local Limb Symptoms:
- Unilateral leg swelling
- Calf or thigh pain (aching/cramping)
- Heaviness in the limb
- Tightness
- Warm sensation
B. Skin Changes:
- Redness (erythema)
- Bluish discoloration (severe cases)
- Shiny, stretched skin
- Dilated superficial veins
C. Severe Presentations:
- Severe swelling and pain (massive DVT)
- Limb discoloration (phlegmasia cerulea dolens)
D. Symptoms of Pulmonary Embolism:
- Sudden shortness of breath
- Chest pain
- Tachycardia
- Hemoptysis- Medical emergency
- Syncope
Some DVTs are silent with no symptoms
DIAGNOSIS:
A. Clinical Assessment:
History +Physical examination -Signs (On Examination)
- Unilateral limb swelling
- Calf circumference difference >3 cm
- Local warmth
- Pitting edema
- Deep calf tenderness
- Dilated superficial collateral veins
- Redness/ skin discoloration
⚠ Homan’s sign (pain on dorsiflexion) is unreliable and not routinely used.
B. Laboratory Tests:
D-dimer
- Elevated in clot formation
- Useful to rule out DVT in low-risk patients
C. Imaging:
1. Compression Doppler Ultrasound – most common
- First-line, non-invasive
- Shows clot in the vein
2. Venography-
- Rarely used invasive test
- Done when ultrasound unclear
3. CT/MR Venography –
- For pelvic or complex DVT
Benefits of Early Treatment
Timely intervention for DVT offers numerous advantages, including:
- Prevention of Pulmonary Embolism: Early treatment reduces the risk of clots traveling to the lungs.
- Reduced Long-Term Complications: Prevents chronic conditions like post-thrombotic syndrome, characterized by swelling, pain, and skin changes.
- Improved Mobility and Quality of Life: Addresses symptoms promptly, enabling patients to return to normal activities.
- Cost-Effectiveness: Early diagnosis and treatment can avoid costly hospital stays or surgeries resulting from complications.
TREATMENT:
MEDICAL TREATMENT:
1. Anticoagulation:
- Common drugs- rivoraxaban, apixaban, dabigatran gives for almost 3 to 6 months.
2. Thrombolysis (clot dissolving drugs):
- In severe cases clot dissolving drugs are administered to actively dissolve the clots
Route of administration-
- Systemic Thrombolysis: drugs given through IV
- Catheter- directed thrombolysis– drug delivered directed at a preferred site through a catheter into the clot
INTERVENTIONAL PROCEDURES:
Used in:
Extensive proximal DVT
Limb threatening DVT
Failure of anticoagulation
1. Catheter-Directed Thrombolysis (CDT)
- A minimally invasive procedure used in case of chronic thrombus in which a catheter is placed directly into the clot and thrombolytic drugs ( ) are infused.
- Helps rapidly dissolve the thrombus and restore venous flow.
- Indicated in extensive proximal DVT (especially iliofemoral) and in young patients to prevent post-thrombotic syndrome.
- Carries a risk of bleeding, so ICU stay is sometimes required along with IV anticoagulants.
2. Mechanical Cetheter- Directed Thrombectomy
- A procedure that physically removes or breaks the clot using special devices inserted via catheter.
- Often combined with thrombolysis (pharmaco-mechanical therapy) for better results.
- Used in severe DVT, limb-threatening cases, or when rapid clot removal is needed.
- Advantage: faster relief of obstruction with less drug use.
3. Inferior Vena Cava (IVC) Filter Placement
- A small umbrella shaped like metal device placed in the inferior vena cava to trap clots and prevent them from reaching the lungs.
- Does not treat existing DVT, only prevents pulmonary embolism.
- May be temporary or permanent, but long-term use can increase risk of future DVT.
- IVC filter removal- usually within 3 months
4. AngioJet-Directed Thrombolysis (Pharmacomechanical Thrombolysis)
- Angiojet is a special catheter-based device used for pharmaco-mechanical thrombolysis, meaning it combines mechanical clot disruption + thrombolytic drug delivery.
- It works by high-velocity saline jets that create a vacuum (Venturi effect) to break the clot and simultaneously aspirate it out.
- Usually done in cases with large, acute thrombus as it allows rapid removal of thrombus.
Advantages-
- Faster clot clearance
- Shorter treatment time
- Doesn’t require ICU stay, discharge the same day
COMPRESSSION THERAPY:
- Graded compression stockings
- Reduce swelling and post- thrombotic syndrome
PREVENTION OF DVT:
In hospital:
- Early Immobilization
- Leg exercise
- Compression stockings
- Preventive anticoagulant after surgery
During travel:
- Walk every 1-2 hours
- Leg stretching
- Hydration
- Compression stocking
- Avoid tight clothing
Life style prevention:
- Physical Activity- daily graded walking/yoga/light exercise
- Maintain healthy weight
- Stop smoking
- Avoid prolonged immobilization
- Stay hydrated
Comprehensive Overview of Treatment Options
Treatment for DVT is tailored to each patient’s condition and risk factors. A combination of therapies is often employed to achieve the best outcomes:
- Medical Management: Regular monitoring and adjusting anticoagulant therapy for effective clot prevention.
- Rehabilitation Programs: Physical therapy to restore strength and mobility.
- Long-Term Care: Ongoing use of compression stockings and follow-ups to monitor for recurrence.
Frequently Asked Questions (FAQs)
Yes, if it leads to pulmonary embolism, which can be fatal without treatment.
No. It requires medical treatment with anticoagulants and in severe cases timely intervention is also important.
Usually 3–6 months, but sometimes lifelong depending on cause.
Yes, walking is encouraged after starting treatment unless doctor advises rest.
No. Many cases are silent.
Yes, especially with:
- Oral contraceptives
- Pregnancy
- Genetic clotting disorders
No. It may dislodge the clot and cause pulmonary embolism.
Yes. Recurrence risk exists, especially without proper treatment.
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