Transudative pleural effusion seen in-a) Nephrotic syndromeb) Rheumatoid arthritisc) Constrictive pericarditisd) Myxedemae) Pulmonary embolism
**Core Concept**
Transudative pleural effusion is a type of pleural effusion characterized by a low protein content and a low fluid viscosity. It is often seen in conditions that cause an imbalance in hydrostatic and oncotic pressures, leading to fluid accumulation in the pleural space.
**Why the Correct Answer is Right**
Transudative pleural effusions are commonly seen in conditions that cause fluid overload, such as nephrotic syndrome. In nephrotic syndrome, the loss of albumin in the urine leads to a decrease in oncotic pressure, causing fluid to shift from the intravascular space to the interstitial space, including the pleural space. This results in a transudative pleural effusion.
**Why Each Wrong Option is Incorrect**
**Option A:** Nephrotic syndrome is indeed a cause of transudative pleural effusion, but it is not the only option listed. The question asks for a specific condition.
**Option B:** Rheumatoid arthritis can cause a pleural effusion, but it is typically exudative in nature due to the presence of inflammatory cells and proteins in the fluid.
**Option C:** Constrictive pericarditis can cause a transudative pleural effusion due to the impaired diastolic filling of the heart, leading to fluid accumulation in the pleural space. However, it is not the most common cause of transudative pleural effusion.
**Option D:** Myxedema can cause a pleural effusion, but it is typically exudative in nature due to the presence of inflammatory cells and proteins in the fluid.
**Option E:** Pulmonary embolism can cause a pleural effusion, but it is typically exudative in nature due to the presence of inflammatory cells and proteins in the fluid.
**Clinical Pearl / High-Yield Fact**
When evaluating a pleural effusion, it is essential to distinguish between transudative and exudative effusions, as they have different underlying causes and prognoses. A transudative effusion is often seen in conditions that cause fluid overload, while an exudative effusion is often seen in conditions that cause inflammation or malignancy.
**Correct Answer: a) Nephrotic syndrome**