**Core Concept**
Succinylcholine is a depolarizing neuromuscular blocking agent that acts by mimicking the action of acetylcholine at the neuromuscular junction, leading to muscle fasciculations and eventual paralysis. When administered via endotracheal intubation, succinylcholine can cause a range of systemic and local effects due to its rapid absorption and distribution.

**Why the Correct Answer is Right**
When succinylcholine is given via endotracheal intubation, it can cause a significant increase in intragastric pressure, which can lead to gastric rupture and other complications. This is because the drug is absorbed rapidly from the stomach lining and can cause a massive contraction of the gastrointestinal smooth muscle. Additionally, the high concentration of succinylcholine in the endotracheal tube can cause irritation and inflammation of the respiratory tract.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because, while succinylcholine can cause cardiac arrhythmias, it is not a primary concern when administered via endotracheal intubation.

**Option B:** This option is incorrect because, while succinylcholine can cause hyperkalemia, it is not a unique consequence of endotracheal administration.

**Option C:** This option is incorrect because, while succinylcholine can cause muscle fasciculations, it is not a primary concern when administered via endotracheal intubation.

**Clinical Pearl / High-Yield Fact**
It is essential for anesthesiologists to be aware of the potential risks of succinylcholine administration via endotracheal intubation, including gastric rupture and respiratory irritation. To minimize these risks, it is recommended to use alternative neuromuscular blocking agents or to administer succinylcholine via a different route.

**Correct Answer:** A.