A newborn was given a drug in neonatal ICU, but then was found in respiratory distress. The likely drug is ?
**Core Concept**
The question is testing the knowledge of a specific drug that can cause respiratory distress in newborns. This is related to the pharmacological effects of certain medications on the neonatal respiratory system.
**Why the Correct Answer is Right**
The likely drug that can cause respiratory distress in newborns is succinylcholine. Succinylcholine is a depolarizing neuromuscular blocking agent used for endotracheal intubation in neonates. However, it can cause severe hyperkalemia and muscle rigidity, particularly in neonates, which can lead to respiratory distress. This is due to the immature muscle physiology and the increased sensitivity of neonatal muscles to succinylcholine.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not relevant to the context of the question.
* **Option B:** While certain medications can cause respiratory depression, this is not the most likely cause of respiratory distress in this scenario.
* **Option C:** This option is not a medication that is commonly associated with respiratory distress in newborns.
**Clinical Pearl / High-Yield Fact**
Succinylcholine can cause severe hyperkalemia in neonates, particularly if used in high doses or in combination with other medications that can increase potassium levels.
**Correct Answer: C. Succinylcholine.**