Aortic valve

(Redirected from Aortic valves)
Jump to navigation Jump to search
Anterior (frontal) view of the opened heart. White arrows indicate normal blood flow.

WikiDoc Resources for Aortic valve

Articles

Most recent articles on Aortic valve

Most cited articles on Aortic valve

Review articles on Aortic valve

Articles on Aortic valve in N Eng J Med, Lancet, BMJ

Media

Powerpoint slides on Aortic valve

Images of Aortic valve

Photos of Aortic valve

Podcasts & MP3s on Aortic valve

Videos on Aortic valve

Evidence Based Medicine

Cochrane Collaboration on Aortic valve

Bandolier on Aortic valve

TRIP on Aortic valve

Clinical Trials

Ongoing Trials on Aortic valve at Clinical Trials.gov

Trial results on Aortic valve

Clinical Trials on Aortic valve at Google

Guidelines / Policies / Govt

US National Guidelines Clearinghouse on Aortic valve

NICE Guidance on Aortic valve

NHS PRODIGY Guidance

FDA on Aortic valve

CDC on Aortic valve

Books

Books on Aortic valve

News

Aortic valve in the news

Be alerted to news on Aortic valve

News trends on Aortic valve

Commentary

Blogs on Aortic valve

Definitions

Definitions of Aortic valve

Patient Resources / Community

Patient resources on Aortic valve

Discussion groups on Aortic valve

Patient Handouts on Aortic valve

Directions to Hospitals Treating Aortic valve

Risk calculators and risk factors for Aortic valve

Healthcare Provider Resources

Symptoms of Aortic valve

Causes & Risk Factors for Aortic valve

Diagnostic studies for Aortic valve

Treatment of Aortic valve

Continuing Medical Education (CME)

CME Programs on Aortic valve

International

Aortic valve en Espanol

Aortic valve en Francais

Business

Aortic valve in the Marketplace

Patents on Aortic valve

Experimental / Informatics

List of terms related to Aortic valve

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]


The aortic valve is one of the valves of the heart. It lies between the left ventricle and the aorta.

Morphology

The aortic valve has three cusps. These cusps are half moon shaped hence also called aortic semilunar valve. Each cusp has a small swelling in the center called the nodule. Dilatation of the wall of the aorta behind these cusps is called aortic sinus. When the aortic valve is open, the normal size of the orifice is 3-4 cm² in adults.

Function & Physiology

During ventricular systole, pressure rises in the left ventricle. When the pressure in the left ventricle rises above the pressure in the aorta, the aortic valve opens, allowing blood to exit the left ventricle into the aorta. When ventricular systole ends, pressure in the left ventricle rapidly drops. When the pressure in the left ventricle decreases, the aortic pressure forces the aortic valve to close. The closure of the aortic valve contributes the A2 component of the second heart sound (S2).

Disease of the aortic valve

There are two protypical processes that can affect the aortic valve - aortic stenosis in which the valve fails to open fully, thereby obstructing blood flow out from the heart, and aortic insufficiency, also called aortic regurgitation, in which the aortic valve is incompetent and blood flows passively back to the heart in the wrong direction. These two conditions frequently co-exist.

Bicuspid aortic valve

The most common congenital abnormality of the heart is the bicuspid aortic valve. In this condition, instead of three cusps, the aortic valve has two cusps. This condition is often undiagnosed until later in life when the person develops symptomatic aortic stenosis. Aortic stenosis occurs in this condition usually in patients in their 40s or 50s, an average of 10 years earlier than can occur in people with congenitally normal aortic valves.

Aortic Valve Replacement

Aortic valve replacement means that a patient's aortic valve is replaced by a different valve. The aortic valve can be affected by a range of diseases and require aortic valve replacement. The valve can either become leaky (regurgitant or insufficient) or stuck partially shut (stenotic). Aortic valve replacement currently requires open heart surgery. Research is being done now to develop valves that can be implanted using a catheter without open heart surgery. There are two basic types of artificial heart valve, mechanical valves and tissue valves. Tissue heart valves are usually made from animal tissues, either animal heart valve tissue or animal pericardial tissue. The tissue is treated to prevent rejection and to prevent calcification.

There are alternatives to animal tissue valves. In some cases a human aortic valve can be implanted. These are called homografts. Homograft valves are donated by patients and harvested after the patient expires. The durability of homograft valves is probably the same for porcine tissue valves. Another procedure for aortic valve replacement is the Ross procedure (after Donald Ross) or pulmonary autograft. The Ross procedure involves going to surgery to have the aortic valve removed and replacing it with the patient's own pulmonary valve. A pulmonary homograft (a pulmonary valve taken from a cadaver) or a valvular prothesis is then used to replace the patient's own pulmonary valve.

The first minimally invasive aortic valve surgery took place at the Cleveland Clinic in 1996. [1]

Additional images

See also

References

External links


de:Aortenklappe no:Aortaklaff nn:Aortaklaff uk:Аортальний клапан

Template:WikiDoc Sources