A patient developed breathlessness and chest pain, on second postoperative day after a total hip replacement. Echo-cardiography showed right ventricular dilatation and tricuspid regurgitation.What is the most likely diagnosis –
Post-op day two, so possible causes could include pulmonary embolism, which is a common complication after surgeries, especially orthopedic ones like hip replacement. Pulmonary embolism can lead to acute pulmonary hypertension, increasing the workload on the right ventricle, causing it to dilate and leading to tricuspid regurgitation. That makes sense because the right ventricle is trying to pump against the increased pressure, leading to dilation and eventual tricuspid insufficiency.
Other options might be things like heart failure, but left-sided heart failure usually presents with pulmonary edema and left ventricular issues, not right ventricular. Myocardial infarction? Unlikely on day two unless there's a history of CAD, but the scenario doesn't mention that. Maybe a cardiac tamponade? But that would present with pericardial effusion signs like Beck's triad. The echo findings here are more specific to RV strain, which points towards pulmonary embolism.
So the correct answer is probably pulmonary embolism. The clinical pearl here is that acute pulmonary embolism is a key differential in post-op patients with RV dilation and tricuspid regurgitation. High-yield fact: remember that DVT and PE are linked, especially in immobile or post-surgical patients. The correct answer is option C if the choices include that.
**Core Concept**
This question examines the differential diagnosis of acute right ventricular (RV) dysfunction post-surgery. Acute pulmonary embolism (PE) is a critical cause of RV strain due to sudden pulmonary artery occlusion, leading to increased right heart afterload and tricuspid regurgitation.
**Why the Correct Answer is Right**
Pulmonary embolism causes acute pulmonary hypertension, forcing the RV to work against elevated afterload. This leads to RV dilation, impaired contractility, and secondary tricuspid regurgitation. Postoperative patients (e.g., total hip replacement) are at high risk for hypercoagulability, immobilization, and venous stasis, making PE the most likely diagnosis. Echocardiographic findings of RV dilatation and tricuspid regurgitation are classic in massive PE.
**Why Each Wrong Option is Incorrect**
**Option A:** Myocardial infarction typically affects the left ventricle and would not cause acute RV dilation without specific right coronary artery involvement.
**Option B:** Cardiac tamponade presents with pericardial effusion, hypotension, and electrical alternans on ECG, not tricuspid regurgitation.
**Option D:** Chronic heart failure usually shows left ventricular dysfunction and pulmonary congestion, not acute RV findings.
**Clinical Pearl / High-Yield Fact**
Remember the **"McConnell's sign"** (RV akinesis with preserved LV function) as a hallmark of acute PE on echocardiography. Postoperative patients with RV strain should always prompt suspicion for PE, even in the absence of leg DVT.
**Correct Answer: C. Pulmonary embolism**