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In page Vagus nerve:
"VNS may also be achieved by one of the vagal maneuvers: holding the breath for 20 to 60 seconds, dipping the face in cold water, coughing, humming or singing, or tensing the stomach muscles as if to bear down to have a bowel movement.[3] Patients with supraventricular tachycardia,[3] atrial fibrillation, and other illnesses may be trained to perform vagal maneuvers (or find one or more on their own).[citation needed]
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