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Persistent vegetative state - Wikipedia. A persistent vegetative state (PVS) is a disorder of consciousness in which patients with severe brain damage are in a state of partial arousal rather than true awareness.
After four weeks in a vegetative state (VS), the patient is classified as in a persistent vegetative state. This diagnosis is classified as a permanent vegetative state some months (3 in the US and 6 in the UK) after a non- traumatic brain injury or one year after a traumatic injury.
Nowadays, more doctors and neuroscientists prefer to call the state of consciousness an unresponsive wakefulness syndrome. There are different legal implications in different countries. Medical definition. In the US, courts have required petitions before termination of life support that demonstrate that any recovery of cognitive functions above a vegetative state is assessed as impossible by authoritative medical opinion.
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Others are equally determined that, if recovery is at all possible, care should continue. The existence of a small number of diagnosed PVS cases that have eventually resulted in improvement makes defining recovery as . This condition differs from a coma: a coma is a state that lacks both awareness and wakefulness.
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Patients in a vegetative state may have awoken from a coma, but still have not regained awareness. In the vegetative state patients can open their eyelids occasionally and demonstrate sleep- wake cycles, but completely lack cognitive function. The vegetative state is also called a . The chances of regaining awareness diminish considerably as the time spent in the vegetative state increases. This diagnosis does not mean that a doctor has diagnosed improvement as impossible, but does open the possibility, in the US, for a judicial request to end life support.
US caselaw has shown that successful petitions for termination have been made after a diagnosis of a persistent vegetative state, although in some cases, such as that of Terri Schiavo, such rulings have generated widespread controversy. In the UK, the term 'persistent vegetative state' is discouraged in favor of two more precisely defined terms that have been strongly recommended by the Royal College of Physicians (RCP). These guidelines recommend using a continuous vegetative state for patients in a vegetative state for more than four weeks. A medical definition of a permanent vegetative state can be made if, after exhaustive testing and a customary 1. A diagnosis of a persistent vegetative state in the US usually still requires a petitioner to prove in court that recovery is impossible by informed medical opinion, while in the UK the .
However, the acronym . This is one for purposes of precision, on the grounds that . Some level of consciousness means a person can still respond, in varying degrees, to stimulation. A person in a coma, however, cannot. In addition, PVS patients often open their eyes in response to feeding, which has to be done by others; they are capable of swallowing, whereas patients in a coma subsist with their eyes closed (Emmett, 1. PVS patients' eyes might be in a relatively fixed position, or track moving objects, or move in a disconjugate (i.
They may experience sleep- wake cycles, or be in a state of chronic wakefulness. They may exhibit some behaviors that can be construed as arising from partial consciousness, such as grinding their teeth, swallowing, smiling, shedding tears, grunting, moaning, or screaming without any apparent external stimulus. Individuals in PVS are seldom on any life- sustaining equipment other than a feeding tube because the brainstem, the center of vegetative functions (such as heart rate and rhythm, respiration, and gastrointestinal activity) is relatively intact (Emmett, 1. Recovery. A 1. 99.
But for non- traumatic injuries such as strokes, only 1. Patients who were vegetative six months after the initial event were much less likely to have recovered consciousness a year after the event than in the case of those who were simply reported vegetative at one month. The longer a patient is in a PVS, the more severe the resulting disabilities are likely to be.
Rehabilitation can contribute to recovery, but many patients never progress to the point of being able to take care of themselves. Recovery after long periods of time in a PVS has been reported on several occasions. Recovery of consciousness can be verified by reliable evidence of awareness of self and the environment, consistent voluntary behavioral responses to visual and auditory stimuli, and interaction with others. Recovery of function is characterized by communication, the ability to learn and to perform adaptive tasks, mobility, self- care, and participation in recreational or vocational activities. Recovery of consciousness may occur without functional recovery, but functional recovery cannot occur without recovery of consciousness (Ashwal, 1. There are three main causes of PVS (persistent vegetative state): Acute traumatic brain injury. Non- traumatic: neurodegenerative disorder or metabolic disorder of the brain.
Severe congenital abnormality of the central nervous system. Medical books (such as Lippincott, Williams, and Wilkins. In A Page: Pediatric Signs and Symptoms) describe several potential causes of PVS, which are as follows: Bacterial, viral, or fungal infection, including meningitis. Increased intracranial pressure, such as a tumor or abscess. Vascular pressure which causes intracranial hemorrhaging or stroke. Hypoxic ischemic injury (hypotension, cardiac arrest, arrhythmia, near- drowning)Toxins such as uremia, ethanol, atropine, opiates, lead, colloidal silver. Objective assessment of residual cognitive function can be extremely difficult as motor responses may be minimal, inconsistent, and difficult to document in many patients, or may be undetectable in others because no cognitive output is possible (Owen et al., 2.
In recent years, a number of studies have demonstrated an important role for functional neuroimaging in the identification of residual cognitive function in persistent vegetative state; this technology is providing new insights into cerebral activity in patients with severe brain damage. Such studies, when successful, may be particularly useful where there is concern about the accuracy of the diagnosis and the possibility that residual cognitive function has remained undetected. Diagnostic experiments.
Activations in response to sensory stimuli with positron emission tomography (PET), functional magnetic resonance imaging (f. MRI), and electrophysiological methods can provide information on the presence, degree, and location of any residual brain function. However, use of these techniques in people with severe brain damage is methodologically, clinically, and theoretically complex and needs careful quantitative analysis and interpretation. For example, PET studies have shown the identification of residual cognitive function in persistent vegetative state. That is, an external stimulation, such as a painful stimulus, still activates .
These results show that parts of the cortex are indeed still functioning in . Moreover, a preliminary f. MRI examination revealed partially intact responses to semantically ambiguous stimuli, which are known to tap higher aspects of speech comprehension (Boly, 2. Furthermore, several studies have used PET to assess the central processing of noxioussomatosensory stimuli in patients in PVS. Noxious somatosensory stimulation activated midbrain, contralateral thalamus, and primary somatosensory cortex in each and every PVS patient, even in the absence of detectable cortical evoked potentials. In conclusion, somatosensory stimulation of PVS patients, at intensities that elicited pain in controls, resulted in increased neuronal activity in primary somatosensory cortex, even if resting brain metabolism was severely impaired. However, this activation of primary cortex seems to be isolated and dissociated from higher- order associative cortices (Laureys et al., 2.
Also, there is evidence of partially functional cerebral regions in catastrophically injured brains. To study five patients in PVS with different behavioral features, researchers employed PET, MRI and magnetoencephalographic (MEG) responses to sensory stimulation. In three of the five patients, co- registered PET/MRI correlate areas of relatively preserved brain metabolism with isolated fragments of behavior. Two patients had suffered anoxic injuries and demonstrated marked decreases in overall cerebral metabolism to 3. Two other patients with non- anoxic, multifocal brain injuries demonstrated several isolated brain regions with higher metabolic rates, that ranged up to 5. Nevertheless, their global metabolic rates remained < 5. Ghost In The Mountains.
MEG recordings from three PVS patients provide clear evidence for the absence, abnormality or reduction of evoked responses. Despite major abnormalities, however, these data also provide evidence for localized residual activity at the cortical level.
Each patient partially preserved restricted sensory representations, as evidenced by slow evoked magnetic fields and gamma band activity. In two patients, these activations correlate with isolated behavioral patterns and metabolic activity.
Remaining active regions identified in the three PVS patients with behavioral fragments appear to consist of segregated corticothalamic networks that retain connectivity and partial functional integrity. A single patient who suffered severe injury to the tegmental mesencephalon and paramedian thalamus showed widely preserved cortical metabolism, and a global average metabolic rate of 6. The relatively high preservation of cortical metabolism in this patient defines the first functional correlate of clinical– pathological reports associating permanent unconsciousness with structural damage to these regions.