![]() To probe this hypothesis, we performed a positron emission tomography (PET) study where we scanned subjects during the first and second minute of a prolonged tonic painful cold stimulation (cold pressor test) and nonpainful cold stimulation. This suggestion is in line with the hypothesis that the brainstem is specifically involved in the initial response to pain. ![]() Thus, systems involved in the autonomic response to painful stimulation, for example the hypothalamus and the brainstem, would be expected to attenuate the response to pain during prolonged stimulation. The autonomic responses to acute pain exposure usually habituate rapidly while the subjective ratings of pain remain high for more extended periods of time. For online neurological health and wellness information, visit NeuroVista at. For more information about the American Academy of Neurology, visit its Web site at. The American Academy of Neurology, an association of more than 16,000 neurologists and neuroscience professionals, is dedicated to improving patient care through education and research. “It‘s important for family members and health care professionals to be aware of this possibility.”Ī neurologist is a medical doctor with specialized training in diagnosing, treating and managing disorders of the brain and nervous system. “The living cells that were ordering these muscles to move were not brain cells or brain stem cells, but cells located in the spinal cord,” he said. The doctors conducted additional tests and confirmed that there was no brain activity. “We had never seen these type of movements before, and they hadn‘t been reported in the medical journals,” said neurologist Joan Martí-Fàbregas, MD, PhD, of the Hospital de la Santa Creu i Sant Pau. The movements stopped after the patients were disconnected from the ventilator. Both patients extended their arms, flexed their wrists and curled up their fingers each time the mechanical ventilator inflated their lungs. The movements occurred in a 30-year-old woman and an 11-month-old baby at a hospital in Barcelona, Spain. “It is also a spinal reflex, but it can be disturbing to family members and others who see this.”Īnother article in this issue of Neurology describes unusual movements in two brain dead patients. “It starts with stretching of the arms, followed by crossing or touching of the arms on the chest, and finally falling of the arms alongside the torso,” he said. It is named for the episode in the Bible where Lazarus is raised from the dead. One of the most startling movements for family members and health care professionals is called the ‘Lazarus sign.’ It is a sequence of movements lasting for a few seconds that can occur in some brain dead patients, either spontaneously or right after the ventilator is disconnected,” Bueri said. “Family members and others need to understand that these movements originate in the spinal cord, not in the brain, and their presence does not mean that there is brain activity. “If the lack of understanding of these movements leads to a delay in the brain death diagnosis or questions about the diagnosis afterwards, there can be important practical and legal implications, especially for organ procurement for transplantation,” Bueri said. Examiners used tests designed to elicit motor movements, such as lifting the arms or legs or touching the palm of the hand.Įlectroencephalogram (EEG) tests did not show any brain activity in any of the patients with movements. ![]() Some of the movements occurred spontaneously others were triggered by touch. In all cases, the movements were seen in the first 24 hours after brain death diagnosis, and no movements were seen after 72 hours. Of the 38 patients, 15 had these motor movements. The study examined all patients at the hospital during an 18-month period with a diagnosis of brain death. “People need to know that these movements are spinal reflexes that do not involve any brain activity.” Ramos Mejia Hospital in Buenos Aires, Argentina. “We found that these movements are more common than has been reported or believed,” said neurologist and study author José Bueri, MD, of J.
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