Animal organisation - transport systems - AQAHeart transplants
Multicellular organisms require transport systems to supply their cells and remove waste products. In humans, one of the functions of the circulatory system is to transport substances.
A heart transplantsAn operation to replace a damaged heart with a healthy heart from a donor. is required in cases of heart failureA condition where the heart is failing to pump sufficient blood around the body at the appropriate pressure.. coronary heart diseaseA form of heart disease in which one or more of the coronary arteries become blocked, depriving the heart muscle of oxygen. can lead to heart failure. The heart fails to pump sufficient blood and organA group of different tissues that work together to carry out a particular function, eg heart and lungs. are starved of oxygenGaseous element making up about 20% of the air, which is needed by living organisms for respiration.. There are different degrees of severity of heart failure.
A consultant assesses the patient's condition. If other treatments are not managing the heart condition, a transplant may be recommended and a patient will be put on a waiting list. A transplant puts major strain on the body, and the benefits and risks will be evaluated including whether the patient's condition is sufficiently severe and other health factors.
There is a shortage of donor hearts in the UK. Only around 200 transplants are carried out each year in a small number of hospitals.
Artificial hearts are plastic devices used occasionally to keep patients alive whilst waiting for a heart transplant. They can also be used to allow a patient's heart to rest to help it recover.
After the transplant, the patient will:
need time to heal, recover and build up strength
have to take drugs called immunosuppressant drugA type of drug that prevents a patient's immune system from rejecting a transplant. for the rest of their life - this prevents the person's immune system from rejecting the donor heart
have an increased risk of infection because of these drugs