Why can orogastric intubation cause heart arrhythmia? i'm a medical student and i can't find the answer sorry if it's not the right place for asking

Rarely happens: The answer that you are looking for is that the esophagus and the heart are both innervated by the vagus nerve, so intubating the esophagus can increase stimulation. The real life answer is that this is extremely rare. Having done thousands of upper endoscopies with heart monitoring, I have never seen it. Still must be cautious though. Good luck with school!