Classification. Hives and angioedema are described by the length of time that symptoms last. A rash and/or swelling lasting less than six weeks is called acute hives/angioedema. Episodes that last more than six weeks are described as chronic hives/angioedema. The causes and the bodyâs reactions that lead to development of hives are different in acute and chronic hives/angioedema, and so treatment is also different.
Types of Stroke. An ischemic stroke occurs if an artery that supplies oxygen-rich blood to the brain becomes blocked. Blood clots often cause the blockages that lead to ischemic strokes. The two types of ischemic stroke are thrombotic (throm-BOT-ik) and embolic (em-BOL-ik). In a thrombotic stroke, a blood clot (thrombus) forms in an artery that supplies blood to the brain. In an embolic stroke, a blood clot or other substance (such as plaque, a fatty material) travels through the bloodstream to an artery in the brain. With both types of ischemic stroke, the blood clot or plaque blocks the flow of oxygen-rich blood to a portion of the brain.
Bhatt added, This combination of plaque and blood clots causes the majority of heart attacks and certain types of stroke, if the blood clot obstructs blood flow to the heart or brain.. An artery to the heart thatâs blocked causes a heart attack. A blocked artery in or leading to the brain causes an ischemic stroke.