In which type of poisonings is gastric lavage contraindicated ?
**Core Concept**
Gastric lavage is a procedure used to remove harmful substances from the stomach, but it's not applicable in all types of poisonings due to the risk of causing further harm. The procedure involves flushing the stomach with water or saline solution to remove the toxin.
**Why the Correct Answer is Right**
Gastric lavage is contraindicated in poisonings involving corrosive substances, as it can cause further damage to the esophagus, stomach, and intestines. Corrosive substances, such as hydrochloric acid, sulfuric acid, and other strong acids or bases, can cause severe burns to the mucosal lining of the gastrointestinal tract. Performing gastric lavage in such cases can lead to perforation, hemorrhage, or even death.
**Why Each Wrong Option is Incorrect**
* **Option A:** Gastric lavage is not contraindicated in poisonings involving sedatives or hypnotics. In fact, it may be beneficial in certain cases to remove the toxin from the stomach.
* **Option B:** Gastric lavage is not contraindicated in poisonings involving antidepressants. While it's not the first line of treatment, it may be used in certain situations to remove the toxin.
* **Option C:** Gastric lavage is not contraindicated in poisonings involving anticholinergic agents. In fact, gastric lavage may be beneficial in removing the toxin from the stomach.
**Clinical Pearl / High-Yield Fact**
Remember the "4Ds" of poisoning management: **D**econtamination (removal of the toxin from the skin or mucous membranes), **D**econtamination (giving activated charcoal to absorb the toxin), **D**iagnosis (identifying the toxin and its effects), and **D**isposition (admitting the patient to the hospital for further treatment).
**Correct Answer:** C. Corrosive substances.