Likewise, I have PVCs (extra heartbeats) whenever I have matter going through my large intestine (I think it's the transverse segment).
It's also tied to left arm pain for me, and occasional panic attacks.
It's been very obvious to me that something is 'wrong' with my Vagus nerve for around 10 years, but I started getting the symptoms a few years before that. I had every kind of non-invasive heart examination I've ever heard of, up through cardiac radiology, and my heart is absolutely fine. I pass EKGs, I pass stress tests. I just sometimes have extra beats, and they're correlated to when I need to go to the bathroom.