**Question:** Heimlich valve is used for drainage of-

A. Airway obstruction
B. Pleural effusion
C. Ascites
D. Airway re-expansion pulmonary edema

**Core Concept:** Heimlich maneuver is a technique primarily used to expel a foreign object or a lung embolism causing airway obstruction. The Heimlich valve is a modified version of the maneuver primarily used to manage specific medical conditions.

**Why the Correct Answer is Right:** The Heimlich valve is designed to drain excess fluid from the lungs (pleural effusion) and abdomen (ascites). It is a modified version of the Heimlich maneuver used in these situations, preventing the reintroduction of the fluid into the patient's respiratory or circulatory system.

**Why Each Wrong Option is Incorrect:**

A. Airway obstruction is not the primary function of the Heimlich valve. The correct technique for airway obstruction is the Heimlich maneuver itself.

B. Pleural effusion and ascites are conditions where the Heimlich valve is used for drainage, not for airway obstruction.

C. Airway re-expansion pulmonary edema (D) is a complication that can occur after rapid removal of excessive fluid from the lungs during chest decompression. The Heimlich valve is not used for this condition.

**Clinical Pearl:** The Heimlich valve is a valuable tool for managing specific medical scenarios, including pleural effusion and ascites, and serves as a safer alternative to the classic Heimlich maneuver in these cases. Always ensure you select the appropriate technique for the correct clinical scenario to ensure patient safety and optimal treatment outcomes.