The vagus nerve innervates the GI tract as the pneumogastric nerve and the relationship between vagus nerve-induced palpitations and GI distress is termed cardiogastric syndrome.

Indeed, irritation at the level of the GI tract can induce inappropriate vagus nerve stimulation proper via the pneumogastric nerve, resulting in a response by the organs at the terminal ends of the vagus nerve, one of which is naturally the heart.

Under such circumstances, a reduction in GI symptoms is directly correlated with a reduction in benign palpitations.

Best regards,

Rutheford Rane, MD (ret.)

Maybe it has been discussed before, but does this Wiki-page give a sort of accurate description of the connection/causal influences between the cardiac and gastric systems?
http://en.wikipedia.org/wiki/Roemheld_syndrome