Heart valves


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Heart valves

Valves that regulate blood flow into and out of the heart chambers.
Mentioned in: Heart Failure

heart

the hollow muscular organ lying on the sternum that serves as a pump controlling the blood flow in two circuits, the pulmonary and the systemic. See also circulatory system.

artificial heart
a mechanical device that replaces the heart by using pulsating air to pump blood to the body. Successfully placed in calves, sheep and dogs as experimental models for the subsequent use of such methods in humans.
heart attack
see myocardial infarction.
heart bones
ossicles in the fibrous skeletal ring which surrounds the aortic orifice of the heart in cattle and occasionally in other species; called also ossa cordis.
heart conducting system
consists of the sinoatrial node, the atrioventricular node, the atrioventricular bundle and its two crura.
cyanotic heart malformations
insufficient oxygenated hemoglobin is received in the peripheral capillary beds resulting in blue discoloration of tissues, and an incapacity of the body to maintain a life-sustaining level of activity.
heart disease
an all-embracing term including those diseases in which there is intrinsic disease of the heart such as uremia, valvular disease, African horse sickness, vitamin E-selenium nutritional deficiency, inherited cardiomyopathies of dogs and cattle, altitude sickness, canine parvovirus infection, and in a number of plant and other poisonings. See also mulberry heart disease.
heart failure cells
hemosiderin-laden macrophages present in the pulmonary alveoli in cases of congestive heart failure.
heart malformations
includes ectopia cordis, patent foramen ovale, ventricular septal defects such as Fallot's tetralogy, Eisenmenger complex, patent ductus arteriosus, aortic coarctation, right aortic arch persistence, truncus arteriosus persistence, fibroelastosis, subvalvular aortic stenosis, anomalous origin of carotid arteries, transposition of great vessels, pulmonic stenosis, aortic stenosis.
heart massage
see cardiac massage.
heart meridian points
acupuncture points along the heart meridian.
heart rate
the number of contractions of the cardiac ventricles per unit of time. For normal rates see pulse rate.
heart score
a concept which sets out that performance in racing horses is related to heart size, now a well-established relationship, and that heart size can be estimated in the living horse by the measurement of the QRS interval.
heart sounds
see heart sounds, heart murmur.
heart strain
is an unpopular concept in any medical science but overtrained horses which perform poorly do have a high incidence of abnormal T waves.
heart valve anomalies
failure of complete development of atrioventricular or semilunar valves results in stenosis or incompetence of the valves and often congestive heart failure.
heart valve hematoma
congenital, usually multiple lesions on the edges of atrioventricular valves, mostly in calves; disappear spontaneously in most cases.
heart valve thrombosis
common lesion on the free edges of valves, often the source of widespread emboli; on healing leave scarred, insufficient valves.
heart valves
flaps of endothelial connective tissue that guard the entrance into and exit from the ventricles and bring about unidirectional blood flow. Include the atrioventricular and semilunar valves, the proper closure of which is essential to maintain circulatory equilibrium, can be diseased and cause heart failure. See also heart murmur, endocarditis, endocardiosis.
References in periodicals archive ?
Heart Valve Voice's White Paper reveals under-diagnosis, treatment gaps and postcode lotteries across the country, with our nation lagging behind Europe in treating heart valve disease
Although the valve conduits did not have the same cell layers as natural heart valves, they functioned in a similar way when the researchers performed flow studies in test tubes.
Microorganisms may attach and develop biofilms on components of mechanical heart valves and surrounding tissues of the heart, leading to a condition known as prosthetic valve endocarditis.
Silzone-coated heart valves went on the market in Europe in 1997 and in the US in 1998.
A hardened heart valve is like a rusty carburetor on a car: It call stall the machinery.
4 Transcatheter Heart Valve Market, Americas, Revenue, 2007 - 2020
CryoLife says it is close to completing advanced animal studies in SynerGraft anterior cruciate ligament (ACL) and SynerGraft vascular graft heart valves.
Officials of FDA took this unusual step after reviewing data showing that many people on the drugs had developed leaky heart valves.
Prosthetic Heart Valves Market, Global, Revenue ($m), 2010-2017 The global prosthetic heart valves market was valued at $1.
Global Market Watch: The Cardiac Prosthetic Heart Valves market value is expected to reach US$2.
21 Prosthetic Heart Valves Market, Australia, Revenue ($m), By Segment, Historic, 2003 - 2010 52
The CryoValve-SG process depopulates the native cells of the donor heart valve leaving a collagen matrix with the same functionality as Cryolife's other cryopreserved heart valves.