Carotid sinus syncope is due to pressure on the carotid sinus in the neck. The incidence of internal carotid artery dissection following cervical spine manipulation is unknown. Mainly, occlusion of the distal internal carotid artery occurs. PM is also linked to carotid artery thickening and increased risk of acute myocardial infarction. These arteries are both branches of the external carotid artery. Most episodes of amaurosis fugax are the result of stenosis of the ipsilateral carotid artery. Peripheral chemoreceptors are located in the aorta and carotid arteries. In one study of patients with carotid artery dissection, 60% had infarcts documented on neuroimaging. Researchers also hypothesize that loud snoring could create turbulence in carotid artery blood flow. The internal carotid arteries are branches of the common carotid arteries. Carotidynia is a syndrome marked by soreness of the carotid artery near the bifurcation. Livgren underwent surgery and received two stents in his carotid arteries. Other anastomoses between the carotid and vertebral arteries support this effect. New studies associate loud "snoring" with the development of carotid artery atherosclerosis. The carotid and vertebral arteries are most commonly affected.