Medical Definition of Immunoglobulin E. Immunoglobulin E: A class of immunoglobulins that includes the antibodies that are important in an allergic response. Abbreviated IgE. A person who has an allergy often has elevated blood levels of IgE. IgE antibodies attack and engage the invading army of allergens.
Liver failure occurs when large parts of the liver become damaged beyond repair and the liver is no longer able to function. Liver failure is a life-threatening condition that demands urgent medical care. Most often, liver failure occurs gradually and over many years.
Heart failure is caused by many conditions that damage the heart muscle, including: 1  Coronary artery disease. 2  Coronary artery disease (CAD), a disease of the arteries that supply blood and oxygen to the heart, causes decreased blood flow to the heart muscle.