📚 Deeper Dive · Scenario 32 of 57

The Leg That Swelled, In Depth

Recognizing DVT & preventing clots — the why behind "hands off, report it"
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Coach Katie
You already lived this with Mrs. Carter. Now let's understand it deeply — how skin breaks down, how you prevent it with your hands, and how you pass it on. Learn it, live it, share it.
Learn It

The clot in the leg, the danger in the lungs

Mr. Delgado has been in bed for days, and now one calf is swollen, warm, red, and tender while the other leg looks normal. That one-sided picture after immobility is the classic look of a deep vein thrombosis (DVT) — a blood clot in a deep leg vein.

Think of blood as a river that needs to keep moving. When a patient lies still for days, the flow in the leg veins slows and can pool — and slow, pooling blood is where clots form. The calf muscles normally act like a pump with every step; take away the walking, and the pump goes quiet.

The signs — and the power of comparison

A DVT is usually one leg: swelling, warmth, redness, and pain or tenderness, often in the calf. Your single most useful move is to compare the two legs — a clear difference in size, color, or temperature is a strong clue. Symmetric swelling of both legs points to other causes (heart or kidney issues), not a single-leg clot.

The rule that protects the patient

As a precaution, keep your hands off a suspected DVT — don't massage or rub it. No trial has proven that massage dislodges a clot, but the theoretical risk isn't worth taking. Notify the provider and follow their orders (imaging, anticoagulation, activity instructions). Once the patient is anticoagulated, early walking is usually encouraged rather than strict bed rest.

Why the danger is in the lungs. If a piece of the clot breaks off, it can travel to the lungs — a pulmonary embolism (PE) — and block blood flow. Watch for sudden shortness of breath, chest pain (often worse with a breath), a fast heart rate, and a falling oxygen level. PE is a life-threatening emergency.

Prevention is the nurse's superpower

Most DVTs are preventable: early mobility and ankle pumps, hydration, and prescribed prophylaxis — sequential compression devices (SCDs) that gently squeeze the legs, and/or anticoagulant medications — plus catching and reporting leg changes early. SCDs are applied to both legs for prophylaxis, but they are contraindicated on a limb with an acute DVT.