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Life Support Essay The issue of sustaining life by medical technology is complicated by uncertainty as to when death actually occurs. Is it when breathing ceases, the heart stops beating, or brain activity is no longer evident? Medical support can keep a body breathing after meaningful signs of human life have ceased. There are individuals who seemingly have died, only to be resuscitated within minutes of interrupted heartbeat or breathing. Some who have been so resuscitated and kept alive with life support have recovered and returned to live normal lives. Others have not. Questions arise in these instances: How long should one try to hold on to life, especially when suffering persists and the quality of life is at question? When is our appointed time to die? Although most people may think of ventilators when they hear the words life support machine, there are many other types of machines used to sustain ones life. The type of life support machine used depends on the medical condition of the patient and the reasons for the use of life support machines. Patients with life threatening illnesses may make the choice to use life support machines while they are still of sound mind and capable of making their own decisions. There are four main types of life support machines. The first is a ventilator, which forces air into the lungs of a patient who cannot breathe on her own. The second type is a pacemaker which is used for those who have irregular heartbeats, or for those who suffer from an abnormality of the blood vessels. Next, there are dialysis machines, which are most commonly used for patients who suffer from renal (kidney) failure. A ventilator works by forcing warm, oxygenated air into the lungs while removing carbon dioxide. A plastic tube is inserted through the mouth and into the trachea, and is then hooked up to the ventilator which monitors every breath of the patient while regulating the air pressure at which the patient receives the air. Pacemakers are used most frequently for those who suffer from an irregular heartbeat or rhythm. They are surgically inserted below the skin, and emit electrical impulses that remind the heart to beat normally. Dialysis machines are used for both short and long term use, sometimes as a temporary measure to maintain the patients health until they can receive a kidney transplant or to prolong and provide a quality of life for people who are not transplant candidates. Hemodialysis is often used three times a week to help cleanse the blood and remove the build-up of deadly toxins. Hemodialysis machines work by removing the patients blood, running it through the machine to cleanse it, and then pumping it back into the patient. This process happens simultaneously with the use of a shunt. Life support machines enable patients to survive for a period of time while their body is recovering from a specific illness or injury. They benefit patients who only need them for a short time as well as people who are attempting to maintain quality of life for the long term. Life support machines are also beneficial in the event that the patient is deemed brain dead. In these circumstances, the organs continue to receive oxygen-rich blood flow to keep them functioning until they can be removed for transplantation. Many believe that life support machines are used only for those who are comatose or critically ill. They are however, also used for those who have a life threatening disease or injury, such as paralysis, who are attempting to maintain a normal life. A perfect example of this is Christopher Reeve. He relied on a ventilator to breathe for him a majority of the time, and before his death, was still able to lead a productive life. Many also believe that life support systems are used only in a hospital. Again, this is not true. The use of noninvasive ventilators are becoming more popular for those who wish to live at home. Patients who receive dialysis are able to reside at home while visiting a dialysis treatment center on scheduled days.