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Beating heart cadaver
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Beating heart cadaver
A beating heart cadaver is a body that is pronounced dead in all medical and legal definitions, connected to a medical ventilator, and retains cardio-pulmonary functions. This keeps the organs of the body, including the heart, functioning and alive. As a result, the period of time in which the organs may be used for transplantation is extended. The heart contains pacemaker cells that will cause it to continue beating even when a patient is brain-dead. Other organs in the body do not have this capability and need the brain to be functioning to send signals to the organs to carry out their functions. A beating heart cadaver requires a ventilator to provide oxygen to its blood, but the heart will continue to beat on its own even in the absence of brain activity. This allows organs to be preserved for a longer period of time in the case of a transplant or donation. A small number of cases in recent years indicate that it can also be implemented for a brain-dead pregnant woman to reach the full term of her pregnancy. There is an advantage to beating heart cadaver organ donation because doctors are able to see the vitals of the organs and tell if they are stable and functioning before transplanting to an ailing patient.
The observed phenomena of lifelike qualities after death is not a new concept. In René Descartes' Discourse on the Method, he notes that decapitated animals move and display characteristics of a living body a few seconds after decapitation which was published in 1637. This continued into the French Revolution where it was observed that people who had been beheaded showed movements in facial muscles and hearts could continue to beat for almost an hour past the time of beheading. The guillotine in some cases did not completely sever head from body. In 1875 an examiner named Pierre Jean Cabanis was assigned the duty of making sure a body was truly dead. There were also stories involving beheadings where the victims would stand up and walk around before falling dead. The ambiguity around brain death and true death has followed it to present day. In an effort to clarify some of these gray areas, the Harvard Medical Committee developed criteria for identifying a body as dead in 1968. These criteria required patients to be completely unaware and unresponsive to external stimuli, have no spontaneous muscle movements, and exhibit no reflexive response even when manipulated. They also required that an electroencephalography (EEG) show no signs of activity. The purpose of this report was to encourage physicians to distinguish brain death and irreversible coma from a persistent vegetative state where the patient still has some awareness and cycles through sleep and wakefulness.
In 1971 similar Minnesota criteria were published eliminating the EEG, repeating the exam after 12 hours, a severe lesion in the brain, and increasing the duration of the apnea test to four minutes rather than Harvard's three minute guideline. Other slight changes in the next decades included the United Kingdom's decision to eliminate the repetition of the exam and change from a duration of the apnea test to specified levels of CO2 in 1976. Later, in 1981 the President's Commission reinstated the apnea test and the repeat exam. In a study done in 1989, only 35% of 195 physicians and nurses involved in organ procurement polled knew brain death criteria. These were not the same nurses and physicians who diagnose brain death. Presently, there is hot debate over the protocol for diagnosing someone as brain dead due to widespread disinformation and misinformation on the internet.
The American Academy of Neurology created a prerequisite and neurological clinical assessment to be used as guidelines for determining brain death published in 2010. To be considered for brain death the body must have a determinant cause of coma, have normal systolic blood pressure, and pass two neurological tests. These neurological assessments commonly consist of an apnea test, reflex tests where the body is manipulated or exposed to a stimulus and does not react, or be in a coma where there is complete unresponsiveness. Cerebral angiography, electroencephalography, transcranial doppler ultrasonography, and cerebral scintigraphy are some of the tests that are used to test if there is any significant brain activity.
Caring for a beating heart cadaver is similar to caring for a living patient. Since the brain has stopped functioning, the hormone levels and blood pressure must be regulated by intensive care unit (ICU) personnel. The protocol for preserving the cadaver aims to prevent infection and maintain adequate oxygenation of tissue. The cadaver's status must be continuously monitored, so that ICU staff can prevent organ failure or quickly operate to save threatened organs.
A beating heart cadaver is kept alive in order to keep its organs from decaying before they can be transplanted. Surgeons will remove the organs, one after the other, and have them transferred to the recipients' treating teams. The entire recovery process is usually completed within four hours. This process was formerly known as an "organ harvest", but the name has since changed to the milder "organ recovery". Many organs can be extracted, and many lives can be saved by one body. The bodies are generally those of organ donors, who have either given first-person consent to become an organ donor, presumptive consent by not explicitly declining to donate or whose legal next-of-kin makes the decision to donate. Some donated organs are taken from non-heart-beating donors. Organs from brain deaths, however, have a better success rate, and currently most organ donation is from these deaths.
How long the brain-dead person is kept on the ventilator may vary depending on the availability of surgical teams and the wishes of the family of that brain-dead person. An anesthesiologist is regularly present at organ donation surgical procedures, not for pain, but to monitor the vital signs and administer medications to optimize organ harvest. Due to the results of the apnea test if a person lacks the brain function to breathe unassisted, it is concluded that it would also lack the brain function to relay the sensation of pain. The anesthesiologist also ensures that muscle spasms or reflexes do not occur during the procedure. Though the brain may be dead, the pathway that reflexes follow does not pass from the stimulus in the body to the brain. Instead the spinal cord coordinates the knee-jerk reactions of reflexes including pulling back from the pain of putting a hand in an open flame or jerking away from an invasive incision. When the brain is dead these pathways remain intact and the anesthesiologist is present to ensure that these reactions do not complicate the procedure.
Pregnancy can be prolonged after brain death. It is then possible to deliver the baby by means of caesarian section. Cadavers have been reported to support a fetus for a period of 107 days. After delivering the baby, some cadavers have subsequently become organ donors. Since 1981 there have been 22 recorded instances of keeping a mother declared brain dead in a beating heart cadaver state until the baby is delivered.
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Beating heart cadaver
A beating heart cadaver is a body that is pronounced dead in all medical and legal definitions, connected to a medical ventilator, and retains cardio-pulmonary functions. This keeps the organs of the body, including the heart, functioning and alive. As a result, the period of time in which the organs may be used for transplantation is extended. The heart contains pacemaker cells that will cause it to continue beating even when a patient is brain-dead. Other organs in the body do not have this capability and need the brain to be functioning to send signals to the organs to carry out their functions. A beating heart cadaver requires a ventilator to provide oxygen to its blood, but the heart will continue to beat on its own even in the absence of brain activity. This allows organs to be preserved for a longer period of time in the case of a transplant or donation. A small number of cases in recent years indicate that it can also be implemented for a brain-dead pregnant woman to reach the full term of her pregnancy. There is an advantage to beating heart cadaver organ donation because doctors are able to see the vitals of the organs and tell if they are stable and functioning before transplanting to an ailing patient.
The observed phenomena of lifelike qualities after death is not a new concept. In René Descartes' Discourse on the Method, he notes that decapitated animals move and display characteristics of a living body a few seconds after decapitation which was published in 1637. This continued into the French Revolution where it was observed that people who had been beheaded showed movements in facial muscles and hearts could continue to beat for almost an hour past the time of beheading. The guillotine in some cases did not completely sever head from body. In 1875 an examiner named Pierre Jean Cabanis was assigned the duty of making sure a body was truly dead. There were also stories involving beheadings where the victims would stand up and walk around before falling dead. The ambiguity around brain death and true death has followed it to present day. In an effort to clarify some of these gray areas, the Harvard Medical Committee developed criteria for identifying a body as dead in 1968. These criteria required patients to be completely unaware and unresponsive to external stimuli, have no spontaneous muscle movements, and exhibit no reflexive response even when manipulated. They also required that an electroencephalography (EEG) show no signs of activity. The purpose of this report was to encourage physicians to distinguish brain death and irreversible coma from a persistent vegetative state where the patient still has some awareness and cycles through sleep and wakefulness.
In 1971 similar Minnesota criteria were published eliminating the EEG, repeating the exam after 12 hours, a severe lesion in the brain, and increasing the duration of the apnea test to four minutes rather than Harvard's three minute guideline. Other slight changes in the next decades included the United Kingdom's decision to eliminate the repetition of the exam and change from a duration of the apnea test to specified levels of CO2 in 1976. Later, in 1981 the President's Commission reinstated the apnea test and the repeat exam. In a study done in 1989, only 35% of 195 physicians and nurses involved in organ procurement polled knew brain death criteria. These were not the same nurses and physicians who diagnose brain death. Presently, there is hot debate over the protocol for diagnosing someone as brain dead due to widespread disinformation and misinformation on the internet.
The American Academy of Neurology created a prerequisite and neurological clinical assessment to be used as guidelines for determining brain death published in 2010. To be considered for brain death the body must have a determinant cause of coma, have normal systolic blood pressure, and pass two neurological tests. These neurological assessments commonly consist of an apnea test, reflex tests where the body is manipulated or exposed to a stimulus and does not react, or be in a coma where there is complete unresponsiveness. Cerebral angiography, electroencephalography, transcranial doppler ultrasonography, and cerebral scintigraphy are some of the tests that are used to test if there is any significant brain activity.
Caring for a beating heart cadaver is similar to caring for a living patient. Since the brain has stopped functioning, the hormone levels and blood pressure must be regulated by intensive care unit (ICU) personnel. The protocol for preserving the cadaver aims to prevent infection and maintain adequate oxygenation of tissue. The cadaver's status must be continuously monitored, so that ICU staff can prevent organ failure or quickly operate to save threatened organs.
A beating heart cadaver is kept alive in order to keep its organs from decaying before they can be transplanted. Surgeons will remove the organs, one after the other, and have them transferred to the recipients' treating teams. The entire recovery process is usually completed within four hours. This process was formerly known as an "organ harvest", but the name has since changed to the milder "organ recovery". Many organs can be extracted, and many lives can be saved by one body. The bodies are generally those of organ donors, who have either given first-person consent to become an organ donor, presumptive consent by not explicitly declining to donate or whose legal next-of-kin makes the decision to donate. Some donated organs are taken from non-heart-beating donors. Organs from brain deaths, however, have a better success rate, and currently most organ donation is from these deaths.
How long the brain-dead person is kept on the ventilator may vary depending on the availability of surgical teams and the wishes of the family of that brain-dead person. An anesthesiologist is regularly present at organ donation surgical procedures, not for pain, but to monitor the vital signs and administer medications to optimize organ harvest. Due to the results of the apnea test if a person lacks the brain function to breathe unassisted, it is concluded that it would also lack the brain function to relay the sensation of pain. The anesthesiologist also ensures that muscle spasms or reflexes do not occur during the procedure. Though the brain may be dead, the pathway that reflexes follow does not pass from the stimulus in the body to the brain. Instead the spinal cord coordinates the knee-jerk reactions of reflexes including pulling back from the pain of putting a hand in an open flame or jerking away from an invasive incision. When the brain is dead these pathways remain intact and the anesthesiologist is present to ensure that these reactions do not complicate the procedure.
Pregnancy can be prolonged after brain death. It is then possible to deliver the baby by means of caesarian section. Cadavers have been reported to support a fetus for a period of 107 days. After delivering the baby, some cadavers have subsequently become organ donors. Since 1981 there have been 22 recorded instances of keeping a mother declared brain dead in a beating heart cadaver state until the baby is delivered.
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