The major advantages of a tissue-based compared to a mechanical-based heart valve prosthesis includes . .

Biology

1 answer:

mash [69]3 years ago

7 0

Answer:

reduced thrombogenicity.

Explanation:

For patients with significant heart valve disease, surgical options for treatment include valve repair or replacement. The choice between repair and replacement is influenced by a number of factors including age, type of the valve disease and other medical conditions. When valve replacement is performed, there are options of mechanical or tissue heart valves. These two classes of valves confer different characteristics and each have their advantages and disadvantages.

Mechanical valves: Mechanical heart valves are made from materials such as titanium and carbon. They usually consist of two leaflets and a metal ring surrounded by a ring of knitted fabric, which is sewn onto the heart in place of the original valve.The main advantage of mechanical valves is that they are very durable. However, these valves provide a surface on which blood clots can form easily. As a result, anyone who has been implanted with a mechanical valve needs to be on lifelong blood-thinning medication, such as warfarin, to prevent the development of blood clots that can cause heart attack or stroke

Tissue valves, also known as biological or bioprosthetic valves, are composed of animal or human tissue. The valves are derived from animal tissue such as porcine (pig), bovine (cow) and equine (horse) models, and then fixed with a preserving solution that may be mounted on a flexible frame to assist in deployment during surgery. As with mechanical valves, the bottom of a tissue valve is often surrounded by a ring of knitted fabric that is sewn onto the heart. In addition to animal-derived valves, a human tissue valve from a donor human heart, known as an allograft or homograft, may also be used as a replacement valve. Tissue valves can be used in open heart surgery or in a minimally invasive aortic operation known as transcatheter aortic valve implantation (TAVI).

Advantages of tissue valves compared to mechanical valves include the avoidance of lifelong warfarin therapy to prevent the development of blood clots.

You might be interested in

Which feedback mechanism is used to regulate blood glucose?

ASHA 777 [7]

B. a negative feedback loop because the blood glucose level was returned to the set point, not amplified

The glands which get involved are the pancreas and adrenal glands. During increase in blood sugar, the pancreas secretes insulin, a hormone produced by the beta cells of the pancreas. Insulin causes red blood cells, muscle cells and fat cell to absorb sugar from the blood.During decrease of blood sugar, the pancreas secretes glucagon, a hormone produced by the alpha cells of the pancreas. Glucagon causes the liver to release the glucose stored in its cells.The Adrenal gland secretes cortisol during times of low blood sugar levels. Cortisol promotes the use of fatty acids to provide energy for working muscles, rather than using glucose.

7 0

3 years ago

This is an organism exhibiting characteristics similar to one known to be dangerous, is called?

leva [86]

Mimicry, this is an organism exhibiting characteristics similar to one known to be dangerous.

8 0

3 years ago

Gametes are____ They have_____ the number of chromosomes. hanloid: double half the

Gnesinka [82]

Answer:

Explanation:

gametes are a haploid which means half. so it would be half the chromosome number.

6 0

3 years ago

Read 2 more answers

A substitute is a good that is _____ another good, and a complement is a good that is _____ another good.

marishachu [46]

The right option is c. consumed in place of; consumed together with

A substitute is a good that is consumed in place of another good, and a complement is a good that is consumed together with another good. Substitutes serve in place of another and complements make something seem better.

8 0

3 years ago

Boreal owls range over a much larger area than do other owls of similar size. The reason for this behavior is probably that the

Sonbull [250]

Answer:

(B) Boreal owls range over larger areas in regions where food of the sort eaten by small mammals is sparse than they do in regions where such food is abundant

Explanation:

Living beings exhibit various changes in the behavior and niche to make themselves better fitted to the conditions of their habitats.

Boreal owls feed on the other smaller mammals such as mice and shrews. These organisms that serve as their prey are relatively less abundant in the habitat. To ensure the food availability, the boreal owls occupy a larger area so that they can catch their less abundant food organisms.

In the habitats where the prey species of boreal owls are present in a larger number, these owls occupy smaller regions since the food organisms are easily available.

7 0

3 years ago