Understanding Heart Transplant
February 22, 2010
Dr. Don Chomsky & Dr. Chester Falterman
Heart Failure: Heart Transplantation
news notes via www.webmd.com
A heart transplant is the replacement of a person's diseased heart with a healthy donor's heart. The donor is a person who has died and whose family has agreed to donate their loved one's organs.
In the nearly four decades since the performance of the first human heart transplant in 1967, heart transplantation has changed from an experimental operation to an established treatment for advanced heart disease. Approximately 2,300 heart transplants are performed each year in the U. S.
A heart transplant procedure is considered when heart failure is so severe that it does not respond to all other therapies, but the person's health is otherwise good.
People who have advanced (end stage) heart failure, but are otherwise healthy may be considered for a heart transplant.
The following basic questions should be considered by you, your doctor, and your family to determine if heart transplantation is right for you.
If you answered "no" to any of the above questions, heart transplantation may not be for you. Also, if you have additional medical problems, such as other severe diseases, active infections, or severe obesity, you most likely will not be considered a candidate for transplant.
In order to get a heart transplant, you must first be placed on a transplant list. But, before you can be placed on the transplant list, you must go through a careful screening process. A team of heart doctors, nurses, social workers and bioethicists review your medical history, diagnostic test results, social history and psychological test results to see if you are able to survive the procedure and then comply with the continuous care needed to live a healthy life.
Once you are approved, you must wait for a donor to become available. This process can be long and stressful. A supportive network of family and friends is needed to help you through this time. The health care team will monitor you closely to keep your heart failure in control until a donor heart is found. The hospital must know where to contact you at all times should a heart become available.
Donors for heart transplants are individuals who may have recently died or become brain dead, which means that although their body is being kept alive by machines, the brain has no sign of life. Many times, these donors died as a result of a car accident, severe head injury or a gunshot wound. Donors give their permission for organ donation before their death; the donor's family must also give consent for organ donation at the time of the donor's death.
Donor organs are located through the United Network for Organ Sharing's (UNOS) computerized national waiting list. This waiting list assures equal access and fair distribution of organs when they become available. When a heart becomes available for transplantation, it is given to the best possible match, based on blood type, body size, UNOS status (based on the recipient's medical condition) and the length of time the recipient has been waiting. The race and gender of the donor have no bearing on the match.
Unfortunately, not enough hearts are available for transplant. At any given time, almost 3,500 to 4,000 people are waiting for a heart or heart-lung transplant. A person may wait months for a transplant and more than 25% do not live long enough to receive a new heart.
Many people who are waiting for transplantation have mixed feelings because they are aware that someone must die before an organ becomes available. It may help to know that many donor families feel a sense of peace knowing that some good has come from their loved one's death.
Once a donor heart becomes available, a surgeon from the transplant center goes to harvest the donor heart. The heart is cooled and stored in a special solution while being taken to the recipient. The surgeon will make sure the donor heart is in good condition before beginning the transplant surgery. The transplant surgery will take place as soon as possible after the donor heart becomes available.
During the operation, the patient is placed on a heart-lung machine. This machine allows the body to receive vital oxygen and nutrients from the blood even though the heart is being operated on.
Surgeons then remove the patient's heart except for the back walls of the atria, the heart's upper chambers. The backs of the atria on the new heart are opened and the heart is sewn into place.
Surgeons then connect the blood vessels, allowing blood to flow through the heart and lungs. As the heart warms up, it begins beating. Surgeons check all the connected blood vessels and heart chambers for leaks before removing the patient from the heart-lung machine.
It is a complicated operation that lasts from 4 to 10 hours.
Most patients are up and around within a few days after surgery, and if there are no signs of the body immediately rejecting the organ, patients are allowed to go home within 7 to 16 days.
What Are the Risks Associated With Transplants?
The most common causes of death following a transplant are infection and rejection. Patients on drugs to prevent transplant rejection are at risk for developing kidney damage, high blood pressure, osteoporosis (a severe thinning of the bones, which can cause fractures), and lymphoma (a type of cancer that affects cells of the immune system).
Atherosclerosis of the heart's arteries or coronary artery disease develops in almost half the patients who receive transplants. And many of them have no symptoms, such as angina (chest pain), because they have no sensations in their new hearts.
What Is Rejection?
Normally, the body's immune system protects the body from infection. This occurs when cells of the immune system move around the body, checking for anything that looks foreign or different from the body's own cells.
Rejection occurs when the body's immune cells recognize the transplanted heart as different from the rest of the body and attempts to destroy it. If left alone, the immune system would damage the cells of a new heart and eventually destroy it.
To prevent rejection, patients receive several drugs called immunosuppressants. These drugs suppress the immune system so that the new heart is not damaged. Because rejection can occur anytime after a transplant, immunosuppressive drugs are given to patients the day before their transplant and thereafter for the rest of their lives.
To avoid rejection, heart transplant recipients must strictly adhere to their immunosuppressant drug regimen. Researchers are continually working on safer, more effective and well-tolerated immunosuppressant medications. However, too much immunosuppression can lead to serious infections. Without an active enough immune system, a patient can easily develop severe infections. For this reason, medications are also prescribed to fight infections.
Heart transplant recipients are carefully monitored for signs of rejection. Doctors frequently take samples of small pieces of the transplanted heart to inspect under a microscope. Called a biopsy, this procedure involves advancing a thin tube called a catheter through a vein to the heart. At the end of the catheter is a bioptome, a tiny instrument used to snip off a piece of tissue. If the biopsy shows damaged cells, the dose and kind of immunosuppressive drug may be changed. Biopsies of the heart muscle are usually performed weekly for the first 3 to 6 weeks after surgery, then every 3 months for the first year, and then yearly thereafter.
It is vital for you to be aware of the possible signs of rejection and infection so you can report them to your doctors and be treated immediately.
Signs of rejection include:
With too much immunosuppression, the immune system can become sluggish, and a patient can easily develop severe infections. For this reason, medications are also prescribed to fight infections. It is vital for you to be aware of the possible signs of rejection and infection so you can report them to your doctors and be treated immediately.
Warning signs of infection include:
If you have any of these symptoms of rejection or infection, notify your doctor right away.
With the exception of having to take lifelong medication to keep the body from rejecting the new heart, many heart transplant recipients lead long and productive lives.
However, there are some things to keep in mind:
How long you live after a transplant depends on many factors, including age, general health and response to the transplant. Recent figures show that 75% of heart transplant patients live at least 5 years after surgery. Nearly 85% return to work or other activities they previously enjoyed. Many patients enjoy swimming, cycling, running or other sports
Is a Heart Transplant Covered by Insurance?
In most cases, the costs related to a heart transplant are covered by health insurance.
It is important to do your own research and find out if your specific health insurance provider covers this treatment, and if you will be responsible for any costs.