**Question:** Gastric lavage is contraindicated in all the following poisonings except

A. Ingestion of non-corrosive substances like cosmetics, medications, or food poisoning
B. Ingestion of corrosive substances like acids or alkalis
C. Ingestion of gases like carbon monoxide or hydrogen cyanide poisoning
D. Ingestion of non-ionizing radiation

**Correct Answer:** .

**Core Concept:**
Gastric lavage, also known as stomach washing, is a procedure involving flushing the stomach with a large volume of fluid to remove toxic substances ingested by a patient. However, its use has been debated due to potential complications and limited efficacy. Contraindications refer to situations where gastric lavage should be avoided or performed with caution.

**Why the Correct Answer is Right:**
Gastric lavage is contraindicated in cases where the ingested substance is non-corrosive, as it might cause irritation to the stomach lining and result in unnecessary complications. Examples include ingestion of non-corrosive substances like cosmetics, medications, or food poisoning. In these cases, the body's natural defense mechanisms and supportive care are typically sufficient in managing the condition.

**Why Each Wrong Option is Incorrect:**

**A.** Ingestion of corrosive substances like acids or alkalis: Gastric lavage is indicated in cases of corrosive substance ingestion as it helps to neutralize the acid or base in the stomach, reducing the damage to the stomach lining and decreasing the severity of the poisoning.

**B.** Ingestion of gases: Gastric lavage may be considered in certain cases of gas poisoning, like carbon monoxide or hydrogen cyanide poisoning, where early intervention is crucial. However, it is not a universal contraindication, as the procedure's effectiveness is limited in removing gases.

**C.** Ingestion of non-ionizing radiation: Gastric lavage is not contraindicated in non-ionizing radiation poisoning, as the procedure would not have any significant effect on the ingestion of non-ionizing radiation.

**D.** Ingestion of non-ionizing radiation: Similar to option C, gastric lavage is not contraindicated in non-ionizing radiation poisoning. The procedure would not have a meaningful impact on the ingestion of non-ionizing radiation.

**Clinical Pearl:**
In the context of gastric lavage, it is essential to weigh the potential risks and benefits of the procedure. While it may be considered for specific poisoning types, the procedure's efficacy in removing gases and non-ionizing radiation is limited. Therefore, contraindications include cases involving corrosive substances (acids, bases, and certain gas poisoning), ionizing radiation poisoning, and situations where gastric lavage may not be effective or cause harm (e.g., gas poisoning, non-ionizing radiation poisoning). In these cases, the body has natural defense mechanisms to neutralize or eliminate the ingested toxic agents, and gastric lavage may cause more harm than good. In contrast, gastric lavage is indicated in cases involving corros