SEARCH · PubMed Health

Results for “Persistent Vegetative State”

Explore indexed PubMed citations for clinical trials, systematic reviews and public health research. Read source abstracts and follow each citation to its original PubMed record.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 397 records · Page 22Linked to original sources

PubMed2005

Wall-eyed bilateral internuclear ophtalmoplegia presenting as monocular alternating nystagmus: a non-epileptic phenomenon in a case of diffuse axonal injury.

A 15-year-old male in a persistent vegetative state due to diffuse axonal injury presented with seizures and spontaneous alternating monocular nystagmus. The cranial MRI revealed diffuse axonal injury involving supratentorial and infratentorial structures, and the splenium of the corpus callosum. The monocular alternating nystagmus was thought to be independent of seizures and occurred as a result of diffuse axonal injury affecting the medial longitudinal fasciculus bilaterally.

Accidents, Traffic↗

PubMed2000

Serial evoked potentials and outcome in cerebrovascular critical care patients.

Median-nerve evoked somatosensory evoked potentials (SEPs) and brainstem auditory evoked potentials (BAEPs), examined early in the course of patients suffering from cerebrovascular disease, correlate statistically significantly with outcome. Little is known about the changes of evoked potentials in the course of disease and their correlation to outcome. In a series of 215 patients (75 supratentorial infarctions, 36 infratentorial infarctions, 58 supratentorial hemorrhages, 18 infratentorial hemorrhages, and 28 aneurysmatic subarachnoid hemorrhages) requiring neurologic intensive care treatment, we prospectively examined the correlation between the findings of serial SEPs and BAEPs and outcome at 4 weeks. Evoked potentials were examined after admission, after 1 week, and after 2 weeks. The findings were classified in 4 categories (normal, unilateral or bilateral pathologic findings, unilaterally attenuated, and bilaterally attenuated). Clinical outcome was determined by classification according to the Glasgow Outcome Scale (death, persistent vegetative state, severely incapacitated, mildly incapacitated, and recovery). Statistical evaluation was performed using Fisher's exact test for all variables. In all subgroups, SEPs correlated statistically significantly with outcome at all three examinations. No correlation was found for BAEPs at first examination in infratentorial disease, nor at second examination in subarachnoid hemorrhages. In all other cases, SEPs and BAEPs were correlated statistically significantly with outcome at all three examination timepoints.

Adult↗

PubMed2002

Tube feeding controversial patients: what do dietitians think?

The use of tube feeding in some patients can be controversial, however, few studies have investigated dietitians' opinions on this subject. A cross-sectional survey of 345 members the Irish Nutrition and Dietetic Institute was conducted using a self-administered, anonymous, postal questionnaire. A 44% response rate was achieved. Mean number of years qualified was 9.3 (8.4). Eighty-one per cent of responders were involved in initiating tube feeding in stroke patients, and 8.5% in discontinuing tube feeding in a patient in a persistent vegetative state (PVS). Nine per cent felt that their input had no influence on the care plan of the patient with dementia and 67% felt that the information given to families (or other decision makers) concerning tube feeding was inadequate. The majority of respondents favoured tube feeding fictitious stroke and cancer patients, but less than half favoured tube feeding a fictitious patient in a PVS or a patient with dementia. When given similar scenarios involving themselves, fewer dietitians wanted to be tube fed.

Contraindications↗

PubMed2000

The ethics of elective (non-therapeutic) ventilation.

Elective ventilation (EV) is ventilation applied, not in the interest of patients, but in order to secure transplantable organs. It carries with it a small risk that patients who would otherwise have died will survive in a persistent vegetative state. Is EV ever justifiable? We argue: (1) The only thing which can justify exposing patients to risk not taken for their benefit is their consent, and we cannot rely on implied consent or third party consent in the case of EV. Thus absent explicit consent of patients, EV is not justifiable. (2) It is not clear that explicit consent should be sought, or where it is offered honoured, given the potential EV has for deterring organ donors and causing stress to staff and families.

Brain Death↗

PubMed2006

Nutrition and hydration: an analysis of the recent papal statement in the light of the Roman Catholic bioethical tradition.

This article discusses the unexpectedly firm stance professed by John Paul II on the provision of artificial nutrition and hydration to patients who are in a persistent vegetative state, and it implications on previously held standards of judging medical treatments. The traditional ordinary/extraordinary care distinction is assessed in light of complexities of the recent allocution as well as its impact on Catholic individuals and in Catholic health care facilities. Shannon concludes that the papal allocution infers that the average Catholic patient is incapable of making proper judgments about their own care. Shannon sees the preservation of life at all costs as at least highly troubling, if not as a radical move against the Catholic medical ethics tradition.

Advance Directives↗

PubMed2006

Can we know what Terri Schiavo would have wanted?

What would Terri Schiavo have wanted? That remains an unanswered question for many who followed the media frenzy that attended the extraordinary court and legislative battles that preceded her death 13 days after her feeding tube was removed for the last time. What would she have directed her physicians to do if she had "miraculously" regained capacity and awareness of the consequences of her cardiac arrest that left her in a persistent vegetative state? Who would she have wanted to make that decision for her if she were unable to do so? How are we to understand the meaning of statements that she purportedly made about life-sustaining treatments approximately 20 years ago, and how can we apply them to the current situation? This article reflects on those questions from the perspective of two small exploratory studies. These studies considered the meanings and interpretation of statements by terminally ill patients concerning desire for hastened death and the relevance of previously made statements to their current clinical situation.

Advance Directives↗

PubMed1994

Brain glucose metabolism in postanoxic syndrome due to cardiac arrest.

Using positron emission tomography (PET), thirteen studies of regional brain glucose utilization were performed in 12 patients with postanoxic syndrome due to cardiac arrest. Investigations were carried out at least one month after brain anoxia. Seven subjects were in a persistent vegetative state. The others had regained normal consciousness with various residual neurological signs. When compared with normal values obtained in 16 normal, age-matched subjects, mean cerebral glucose metabolism was drastically decreased (+/- 50%) in vegetative cases, and to a lesser degree (+/- 25%) in conscious subjects. The most consistent regional alterations were observed in the parieto-occipital cortex (9 cases), the frontier between vertebral and carotid arterial territories. Other selective anomalies were found in the frontomesial junction (5 cases), the striatum (3 cases with dystonia), and the visual cortex (2 cases with cortical blindness). This study suggests that cerebral anoxia results in a global brain hypometabolism, which appears related to the vigilance state, as well as in regional disturbances preferentially located in arterial border zones. Although our findings remain to be confirmed in larger series, they suggest that PET provides a useful index of residual brain tissue function after anoxia and may assist in the monitoring of postanoxic encephalopathies.

Adult↗

PubMed1997

The use of limited critical care resources: an ethical dilemma.

The following article consists of a review of the literature surrounding the issue of persistent vegetative state (PVS) patients and resource allocation. The author attempts to analyze the question: Should limited critical care resources be used on PVS patients at the risk of denying those resources to others? The author explores such factors as: prognosis and recovery in PVS, life expectancy, and quality of life. As well, resource availability and ICU costs involved in sustaining the life of a PVS patient are examined. Finally, principles such as non-maleficence and beneficence; as well as the critical care professionals attitudes toward this issue; and the moral, ethical, and emotional dilemmas are discussed.

Adolescent↗

PubMed2003

Re-evaluation of short latency somatosensory evoked potentials (P13, P14 and N18) for brainstem function in children who once suffered from deep coma.

One of the major clinical features of brain death is deep coma. Therefore, we re-evaluated retrospectively electrophysiological examinations of brainstem function in about 31 children who had once suffered from deep coma in order to reveal its pathophysiological characteristics. The patient age at coma ranged from 1 month to 10 years (mean 2 years 1 month). The electrophysiological examinations were performed, including any of short-latency somatosensory evoked potential (SSEP), brainstem auditory evoked potential (BAEP) and blink reflexes. We first compared results between the fair and poor prognostic groups, and then re-evaluated SSEP results on a few severely impaired patients with persistent vegetative state (PVS). Subsequently, SSEP clarified more specific findings for a deep coma condition than BAEP and blink reflex. A lack of P14, N18 and N20, and an amplitude reduction or vagueness of P13 in SSEP in these children strongly suggested high risk in their future neurological prognosis. In conclusion, electrophysiological examinations, especially SSEP (P13, P14 and N18), might be very useful in obtaining a long-term neurological prognosis after deep coma in children.

Blinking↗

PubMed1999

Cerebral arteriovenous malformation in pregnancy: presentation and neurologic, obstetric, and ethical significance.

Cerebral arteriovenous malformations infrequently complicate pregnancy. We sought to determine the neurologic, obstetric, and ethical significance of such malformations. We present the clinical course of 2 pregnant women with arteriovenous malformations who experienced cerebral hemorrhage and a loss of capacity for decision making. We also review the neurologic and obstetric significance of arteriovenous malformations in pregnancy. Various treatment options with concern for pregnancy and the prognosis for arteriovenous malformations are outlined. The ethical issues involved for pregnant patients whose decisional capacity is compromised as a result of cerebral injury are explored. A review of persistent vegetative state and brain death (death by neurologic criteria) occurring in pregnancy allows us to explore many issues that are applicable to decisionally incapacitated but physiologically functioning pregnant women. We outline a document, the purpose of which is to obtain advance directives from pregnant women regarding end-of-life decisions and to appoint a surrogate decision maker. We believe that evaluation and treatment of the arteriovenous malformation may be undertaken without regard for the pregnancy and that the pregnancy should progress without concern for the arteriovenous malformation.

Adolescent↗

PubMed2003

Clinical application of drug pump for spasticity, pain, and restorative neurosurgery: other clinical applications of intrathecal baclofen.

Intrathecal baclofen has been successfully used for control of severe spasticity. Baclofen, an agonist of GABA-B receptor, has other potential effects on pain and recovery from coma. Sporadic episodes of dramatic recovery from persistent vegetative state are reported after intrathecal administration of baclofen. There are also reports on the use of baclofen for neuropathic pain including post-stroke central pain syndrome. Baclofen is also used for control of dystonia due to cerebral palsy or reflex sympathetic dystrophy. On the other hand, epidural spinal cord stimulation has been used for pain, spasticity, dystonia, or attempt to improve deteriorated consciousness, though the effects seem variable and modest. Similarity between baclofen and spinal cord stimulation is interesting in that both involves in spinal GABAergic system. The GABAergic system in the spinal cord plays a pivotal role in various clinical effects of these procedures.

Baclofen↗

PubMed2003

Predictive value of somatosensory evoked potentials for awakening from coma.

OBJECTIVES: A systematic review of somatosensory evoked potentials performed early after onset of coma, to predict the likelihood of nonawakening. The pooled results were evaluated for rates of awakening, confidence intervals, and the possibility of rare exceptions. DATA SOURCES: Forty-one articles reporting somatosensory evoked potentials in comatose patients and subsequent outcomes, from 1983 to 2000. STUDY SELECTION: Studies were included if they reported coma etiology, age group, presence or absence of somatosensory evoked potentials, and coma outcomes. DATA EXTRACTION: We separated patients into four groups: adults with hypoxic-ischemic encephalopathy, adults with intracranial hemorrhage, adults and adolescents with traumatic brain injury, and children and adolescents with any etiologies. Somatosensory evoked potentials were categorized as normal, abnormal, or bilaterally absent. Outcomes were categorized as persistent vegetative state or death vs. awakening. DATA SYNTHESIS: For each somatosensory evoked potential result, rates of awakening (95% confidence interval) were calculated: adult hypoxic-ischemic encephalopathy: absent 0% (0%-1%), abnormal 22% (17%-26%), normal 52% (48%-56%); adult intracranial hemorrhage: absent 1% (0%-4%), present 38% (27%-48%); adult-teen traumatic brain injury: absent 5% (2%-7%), abnormal 70% (64%-75%), normal 89% (85%-92%); child-teen: absent 7% (4%-10%), abnormal 69% (61%-77%), normal 86% (80%-92%). CONCLUSIONS: Somatosensory evoked potential results predict the likelihood of nonawakening from coma with a high level of certainty. Adults in coma from hypoxic-ischemic encephalopathy with absent somatosensory evoked potential responses have <1% chance of awakening.

Adolescent↗

PubMed2004

Gardner; re BWV: Victorian Supreme Court makes landmark Australian ruling on tube feeding.

The Victorian Supreme Court has decided that artificial nutrition and hydration provided through a percutaneous gastrostomy tube to a woman in a persistent vegetative state may be withdrawn. The judge ruled, in line with a substantial body of international medical, ethical and legal opinion, that any form of artificial nutrition and hydration is a medical procedure, not part of palliative care, and that it is a procedure to sustain life, not to manage the dying process. Thus, the law does not impose a rigid obligation to administer artificial nutrition or hydration to people who are dying, without due regard to their clinical condition. The definition of key terms such as "medical treatment", "palliative care", and "reasonable provision of food and water" in this case will serve as guidance for end-of-life decisions in other states and territories. The case also reiterates the right of patients, and, when incompetent, their validly appointed agents or guardians, to refuse medical treatment. Where an incompetent patient has not executed a binding advance directive and no agent or guardian has been appointed, physicians, in consultation with the family, may decide to withdraw medical treatment, including artificial nutrition or hydration, on the basis that continuation of treatment is inappropriate and not in the patient's best interests. However, Victoria and other jurisdictions would benefit from clarification of this area of the law.

Administration, Cutaneous↗

PubMed1999

Elevated jugular venous oxygen saturation after severe head injury.

OBJECT: The aim of this study was to investigate the incidence of elevated (> or = 75%) jugular venous oxygen saturation (SjvO2) and its relationship to cerebral hemodynamic and metabolic parameters and to outcome after severe head injury. METHODS: Data from 450 severely head injured patients admitted to the Neurosurgical Intensive Care Unit of Ben Taub General Hospital were analyzed retrospectively. The SjvO2 was measured in blood obtained from indwelling jugular bulb catheters. Patients were classified into the following categories: high (Group I), normal (Group II), or low SjvO2 (Group III) if their mean SjvO2 over the duration of monitoring was 75% or higher, 74 to 56%, or 55% or lower, respectively. A high SjvO2 occurred in 19.1% of patients. There was no consistent relationship between SjvO2 and simultaneous cerebral blood flow (CBF) or cerebral perfusion pressure measurements. Compared with Groups II and III, the patients in Group I had a significantly higher CBF and lower cerebral metabolic rate of oxygen (CMRO2). In Group I, the outcomes were death or persistent vegetative state in 48.8% of patients and severe disability in 25.6%. These outcomes were significantly worse than for patients in Group II. Within Group I, the patients with a poor neurological outcome were older and more likely to have suffered a focal head injury; they demonstrated a lower CMRO2 and a greater rate of cerebral lactate production than the patients who attained a favorable outcome. CONCLUSIONS: Posttraumatic elevation of SjvO2 is common but cannot be automatically equated with hyperemia. Instead, elevated SjvO2 is a heterogeneous condition that is associated with poor outcome after head injury and may carry important implications for the management of comatose patients.

Adult↗

PubMed1994

The interest of multimodality evoked potentials in the evaluation of chronic coma.

The clinical usefulness of three-modality evoked potentials (TMEPs) has been widely demonstrated in acute coma, but is still a matter of debate in the persistent vegetative state. We observed that TMEPs in vegetative patients could be situated along a continuum, one extremity of which corresponds to absent cortical, but preserved brain-stem activities, and the other extremity to major abnormalities of somatosensory conductions at the midbrain level, but variable involvement of auditory pontine and visual cortical pathways. The former pattern is most often associated with ischemic-anoxic encephalopathy, while the latter is most often consecutive to head trauma. However, all intermediate states may be observed. TMEPs can usefully complement the clinical evaluation in answering two questions. The first one concerns the chances of subsequent improvement that are lower in the absence of quantitative TMEP evolution, but are likely to be higher in the presence of non-fixed mesencephalic dysfunction associated with a relative preservation of cortical function. The second question concerns the evaluation of remaining cognitive abilities that are more likely to be present if only mild abnormalities of cortical activities are found and if some cognitive EPs are still obtained.

Adult↗

PubMed2000

Beyond Bland: a critique of the BMA guidance on withholding and withdrawing medical treatment.

In Bland the House of Lords held it lawful to withdraw tube-feeding from a patient in a 'persistent vegetative state' (pvs), even with intent to kill him. The British Medical Association (BMA) recently published guidance on the withholding and withdrawal of 'medical treatment', so defined as to include food and water delivered by tube. The guidance endorses the withholding/withdrawal of tube-delivered food and water not only from patients in pvs but also from other non-terminally ill patients, such as those with severe dementia or serious stroke. The underlying justification appears (as in Bland) to be that such lives lack worth. This article offers three major criticisms of the guidance. First, its argument that tube-feeding is medical treatment rather than basic care is weak. Secondly, its reasons for not treating or tube-feeding undermine the BMA's long-standing opposition to active euthanasia and active assisted suicide. Thirdly, it relies heavily on legal precedent at the expense of ethical reasoning.

Dementia↗

PubMed1998

Prognosis in the intensive care unit: finding accurate and useful estimates for counseling patients.

OBJECTIVES: Counseling critically ill patients and their families about what the future is likely to hold requires accurate prognostic information. Our goal is to teach clinicians how to find and critically appraise prognostic studies that examine homogeneous populations. CLINICAL EXAMPLE: An article describing the outcomes of a group of children who are in a prolonged, persistent vegetative state. RECOMMENDATIONS: The validity of prognostic studies is increased when: a) the sample of patients is representative; b) patients are homogeneous with respect to prognostic risk; c) follow-up is sufficient to minimize the possibility that the missing patients could alter the interpretation of the results; and d) health outcomes are evaluated, using objective and unbiased criteria. The likelihood of these outcomes over time and the precision around these probability estimates should be easily understandable. Before using the results of these studies to counsel patients and families, practitioners should ensure that the patients in the study and their management are similar to the patient in question, and that follow-up of the subjects is sufficiently long. CONCLUSIONS: The criteria outlined in this article may assist clinicians in interpreting articles describing the prognosis of patients with similar clinical conditions.

Adolescent↗

PubMed2006

[Advance refusal of treatment in case of loss of autonomy due to persistent brain disease].

A short overview is given of the current debate on ethics and legal clarification of the range and binding force of so-called living wills demanding interruption of treatment in case of loss of autonomy due to persistent or progressive brain disease. Using the examples of dementia and persistent vegetative states - conditions with growing significance for psychiatrists - the binding force of living wills is examined for cases in which the irreversibility and extent of consciousness loss cannot be predicted with certainty. The range of living wills' authority appears also unclear. Legal proposals for limiting them to disease conditions near death are confronted by other proposals that reject such limitations. Added to this is the medical uncertainty of assessing the criterion nearness to death in irreversible and life-limiting diseases. The patient's right of self-determination, confirmed by high court decisions, to refuse in advance treatments that are life-prolonging but require consent is opposed to the medical obligation to save life and act in the patient's best interest. Moral dilemmas caused by this situation on the part of physicians, carepersons, and relatives or others, particularly authorized persons, should be solved by an exhaustive discussion with all persons who are involved in such decisions, and in a way that comes as near as possible to the patients living will.

Advance Directives↗