Conversation so far:
where is the vagus nerve located and what effect does stimulation of nerve have on the patient
The vagus nerve arises from the medulla and projects connections to other locations on the central nervous system. Vagus nerve stimulation treats drug-resistant epilepsy and treatment-resistant depression.
what are the side effects of vagus nerve stimulation
The adverse effects of vagus nerve stimulation include cardiac arrest, bradycardia, voice altercation and hoarseness, cough, shortness, a tingling sensation, nausea, headache, difficulty swallowing, and sleepiness.
what is the mechanism of action for vagus nerve stimulation
As of 2017 little was understood about exactly how vagal nerve stimulation modulates mood and seizure control.
what type of device is used for vagus nerve stimulation
A matchbox sized generator is implanted under the skin below the collarbone. Lead wires tunnelled up the patient's neck to the left vagus nerve's carotid sheath deliver electrical impulses.

Question: is there any controversy
Self-contained rewrite: is there any controversy involving vagus nerve stimulation