A Glossary of Heart Failure Terms
Mitral Insufficiency: A condition where the mitral valve does not fully close during heart contraction, allowing blood from the left ventricle to leak back into the left atrium.
Mitral Stenosis: A condition where the mitral valve becomes narrowed or stenotic preventing the easy flow of blood from the left atrium into the left ventricle.
Mitral Valve: The valve that lies between the left atrium and left ventricle (main pumping chamber of the heart). This valve allows blood to flow from the left atrium into the left ventricle.
Morbidity Rate: The percentage of people who have complications from a medical condition or after a procedure or treatment.
Mortality Rate: The percentage of deaths associated with a disease or medical treatment.
Multigated Acquisition Scan (MUGA scan): A nuclear scan that evaluates the pumping function of the ventricles.
Murmur: Turbulent blood flow across a heart valve creating a "swishing" sound heard by a stethoscope.
Myocardial Biopsy (Cardiac biopsy): An invasive procedure to obtain a small piece of heart muscle tissue for analysis.
Myocardial Infarction (Heart attack): See heart attack (above).
Myocarditis: Inflammation of the myocardium (heart muscle).
Myocardium: Heart muscle.
Myomectomy: A surgical procedure to remove abnormally thickened heart muscle. Used to treat people with idiopathic hypertrophic subaortic stenosis (IHSS) or HOCM to relieve the obstruction to blood flow in the left ventricle during contraction.
Nitroglycerin: A drug used to relax and dilate the blood vessels (vasodilator), improving blood flow. It is the most common vasodilator used to treat angina.
Nuclear Scan: Nuclear imaging is a method of producing images by detecting radiation from different parts of the body after the administration of a radioactive tracer material.
Obesity: Excess fat due to eating more calories than used. It is usually defined having a body mass index (BMI -- see above) of 30 or higher.
Off Pump Heart Surgery: Heart surgery done without the use of the cardiopulmonary bypass machine.
Pacemaker: A small electronic device is implanted under the skin and sends electrical impulses to the heart muscle to maintain a suitable heart rate and to prevent slow heart rates.