Snapshot A 20-year-old woman presents to the emergency room for palpitations. She has previously had 1 or 2 episodes of this in the past few months. She reports that coughing or performing the Valsalva maneuver resolves the palpitations. However, this time the maneuver had no effect. Her pulse is 184/min, blood pressure is 100/60 mmHg, and respirations are 20/min with O2 saturation of 99% on room air. The physician presses on her neck and her pulse returns to 80/min. (Carotid massage) Introduction Mean arterial pressure is in part maintained by baroreceptors and chemoreceptors login to view 1 more bullet These peripheral receptors are located at the login to view 5 more bullets Baroreceptors Baroreceptors and mechanoreceptors login to view 5 more bullets Carotid sinus login to view 1 more bullet Aortic arch login to view 1 more bullet Baroreceptor reflex login to view 37 more bullets Chemoreceptors Chemoreceptors sense levels of oxygen, carbon dioxide, and pH Peripheral chemoreceptors login to view 13 more bullets Central chemoreceptors login to view 9 more bullets Cushing Reaction Cushing reaction login to view 2 more bullets ↑ Intracranial pressure constricts vessels → cerebral ischemia login to view 1 more bullet ↑ Sympathetic outflow → ↑ TPR → ↑ arterial pressure login to view 2 more bullets