Effect of vagal stimulation in acute asthma

American lung association report,there were 1.8 million emergency department visits and 3,816 deaths per year attributable to asthma [1]. according to (GINA2012) the role of complementary and alternative medicine in adult asthma treatment are limited because these approaches have been insufficiently researched and their effect are largely unproven [2]. the parasympathetic nervous system are the primary regulators of pulmonary smooth muscle tone. Postganglionic parasympathetic nerves mediate both cholinergic contractions and inhibitory non-adrenergic non-cholinergic (iNANC) relaxations. It is the close balance between these two that ultimately determines airway caliber. These relaxation and contraction responses are through anatomical and physiological distinct vagus nerve pathways [3].