After total knee implant surgery, a 65-year-old woman complains of calf pain and swelling in the leg from last 2 days. Later she complains of breathlessness and dies suddenly in the ward. What is the probable cause?
First, the symptoms after surgery: calf pain and swelling. That makes me think of deep vein thrombosis (DVT). DVT is a common postoperative complication, especially after orthopedic surgeries like knee replacements. The swelling and pain in the calf are classic signs.
Then she develops breathlessness and dies suddenly. That points towards a pulmonary embolism (PE). A PE occurs when a thrombus from the deep veins breaks off and travels to the lungs, causing a blockage. The sudden death is consistent with a massive PE, which can lead to acute right heart failure and cardiac arrest.
Looking at the options, the correct answer should be PE. Now, let's check the other options to make sure.
Option A: Maybe a myocardial infarction? But the symptoms don't fit. MI usually presents with chest pain, not breathlessness after DVT. Also, the temporal relation to surgery makes PE more likely.
Option B: Pneumothorax? That can cause sudden breathlessness, but usually there's no prior DVT. Also, pneumothorax would have chest pain and maybe decreased breath sounds, not the sequence described here.
Option C: Aortic dissection? Less likely. Aortic dissection after surgery is rare and would present with tearing chest pain, not calf symptoms leading to sudden death.
Option D: Maybe a spinal cord injury? But the scenario doesn't mention any trauma or neurological deficits. The symptoms point more towards embolic events.
Clinical pearl: Remember Virchow's triad for DVT—stasis, hypercoagulability, endothelial injury. Post-op patients are at high risk. The classic presentation of DVT followed by sudden PE is a red flag. Always consider PE in post-op patients with unexplained dyspnea.
**Core Concept**
This question tests understanding of postoperative complications, specifically the pathophysiology and clinical course of **pulmonary embolism (PE)** secondary to **deep vein thrombosis (DVT)**. The scenario highlights the risk of **venous thromboembolism (VTE)** after **major orthopedic surgery**, a classic high-risk scenario governed by **Virchow’s triad** (stasis, hypercoagulability, endothelial injury).
**Why the Correct Answer is Right**
The patient’s **calf pain and swelling** indicate **DVT**, likely due to **stasis** from postoperative immobility and **hypercoagulability** from surgical trauma. The **sudden breathlessness and death** point to a **massive PE**, where a thrombus dislodges, travels to the pulmonary arteries, and causes **acute right ventricular strain**, **hypoxia**, and **cardiogenic shock**. This cascade is a **classic textbook presentation** of VTE post-surgery.
**Why Each Wrong Option is Incorrect**
**Option A:** *Myocardial infarction* is unlikely due to the absence of chest pain, ECG changes, or cardiac risk factors in the prompt.
**Option B:** *Pneumothorax* would cause **sudden pleuritic chest pain** and **decreased breath