DISTANT SPREAD OF TOXIN EFFECT. Postmarketing reports indicate that the effects of DYSPORTÂ® and all botulinum toxin products may spread from the area of injection to produce symptoms consistent with botulinum toxin effects.
Not to be confused with Agonal heart rhythm. Agonal respiration, gasping respiration or agonal breathing is an abnormal pattern of breathing and brainstem reflex characterized by gasping, labored breathing, accompanied by strange vocalizations and myoclonus. Possible causes include cerebral ischemia, extreme hypoxia or even anoxia.
But when you exhale and hold it, your body is left with almost no oxygen. And I guess this is also the reason why the gasp after we are done holding our breath is louder and more intense in the latter case than the former. P.S1: I had to conduct the experiment thrice. P.S2: This was a seemingly right logic.