After a successful Total Hip Replacement a 59 year old patient developed severe chest pain. Echocardiography revealed reduced wall motion of right ventricle with slow flow across the tricuspid valve. Which of the following is most likely diagnosis?
**Core Concept**
Pulmonary embolism (PE) is a life-threatening condition where one or more arteries in the lungs become occluded by a blood clot, leading to impaired gas exchange, right ventricular strain, and potentially fatal complications. In the context of a recent Total Hip Replacement (THR), the risk of venous thromboembolism (VTE) is significantly increased, making PE a likely concern.
**Why the Correct Answer is Right**
The patient's symptoms of severe chest pain, echocardiographic evidence of reduced right ventricular wall motion, and slow flow across the tricuspid valve are indicative of right ventricular strain due to a large pulmonary embolism. This occurs when the clot obstructs blood flow to the lungs, causing the right ventricle to work harder against increased resistance, leading to its reduced function and decreased flow across the tricuspid valve. The recent THR surgery has likely triggered a hypercoagulable state, increasing the risk of VTE.
**Why Each Wrong Option is Incorrect**
**Option A:** Fat Embolism Syndrome (FES) is a possible complication of THR, but it would typically present with symptoms such as respiratory distress, neurological deficits, and petechial rash, rather than isolated right ventricular strain.
**Option B:** Myocardial Infarction (MI) could cause chest pain and echocardiographic abnormalities, but it would not typically result in slow flow across the tricuspid valve, which is a hallmark of right ventricular strain due to PE.
**Option C:** Cardiac Tamponade is a condition where fluid accumulation in the pericardial sac compresses the heart, leading to impaired cardiac function. While it could cause chest pain and echocardiographic abnormalities, it would not typically result in slow flow across the tricuspid valve.
**Option D:** Pulmonary Hypertension could cause right ventricular strain and echocardiographic abnormalities, but it would not typically result in sudden onset of severe chest pain and slow flow across the tricuspid valve.
**Clinical Pearl / High-Yield Fact**
In patients undergoing THR, a high index of suspicion for VTE is crucial, and prompt evaluation and treatment can significantly improve outcomes. The use of prophylactic anticoagulation and early mobilization can help mitigate this risk.
**Correct Answer:** C.