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Relative prognostic value of best motor response and brain stem reflexes in patients with severe head injury.

The object of this study was to determine whether the addition of information on brain stem reflexes improves the prognostic precision of the Glasgow coma scale for patients with severe head trauma. The study is based on 109 patients with a Glasgow coma score of 7 or less during the first 24 hours after injury. The average age was 23 years. The patients were classified into three groups according to their actual outcome after 6 months: dead, 44 patients; persistent vegetative state and severe disability, 13 patients; moderate disability and good recovery, 52 patients. We then compared, by means of multiple group logistic regression, the prognostic ability of motor responses alone using the Glasgow criteria and of brain stem reflexes via an original approach. We showed that the predictive capabilities of brain stem reflexes were greater than those of motor responses. Although closely related (r = 0.68), the use of these two parameters in a single scale, the Glasgow-Liege scale, improves the precision of prognosis, especially for those head trauma patients with initial and complete loss of consciousness. Age was also revealed to be an important factor for outcome prediction.

Adolescent↗

The use of lobectomy in the management of severe closed-head trauma.

A retrospective review is presented of 20 patients with traumatic brain injury who were treated during the course of their illness by lobectomies either after a herniation or other significant deterioration or to reduce elevated intracranial pressure. All the patients suffered from blunt head trauma. Patient ages ranged from 19 to 59 years (average, 34 yr). The initial Glasgow Coma Scale score ranged from 3 to 15 (average, 8.2). There were 14 frontal lobectomies, 2 temporal, 3 frontal and temporal, and 1 occipital. Surgery was performed between 0 and 8 days after injury (average, 2.8). Outcome was favorable (good or moderately disabled) in 11 patients and unfavorable (severely disabled, persistently vegetative, or dead) in 9. No patients survived in a persistently vegetative state. A higher initial Glasgow Coma Scale score was positively correlated with a more favorable outcome (P < 0.03). Younger patients also showed a significant positive relationship to outcome (P < 0.0005). Better pupillary reactivity showed a significant trend toward a more favorable outcome (P < 0.04). The type of lesions identified on computed tomographic scans had no association with outcome. A lobectomy can be a useful adjuvant in the management of severe brain injury, especially in younger patients with relatively higher initial Glasgow Coma Scale scores who subsequently deteriorate or develop elevated intracranial pressure.

Adult↗

[A study of cerebral hemodynamics using transcranial Doppler ultrasonography with special reference to clinical evaluation of pulsatility index].

Transcranial Doppler Ultrasonography (TCD) is now commonly used to evaluate the cerebral hemodynamics. However, the blood velocity measured with TCD is not always accurate, because as a rule the direction of the blood flow does not completely coincide with that of the ultrasonic beam. The error in the measurement could be as large as 15%. This could be eliminated by calculating pulsatility index (PI) from the Doppler ultrasonography. This study evaluates the reliability of the PI as an index of cerebral hemodynamics. In total, 164 measurements were made in patients with various cerebrovascular diseases (CVD), including 14 of brain death patients (group B) and 14 of inpending herniation patients (group I). Of CVD, 46 were persistent vegetative state patients (group V), and 43 were in relatively good conditions (group A). Other including 15 of hydrocephalus patients (group H) and 19 of cerebral vasospasm after subarachnoid hemorrhages (group S) were also investigated. Nineteen normal young volunteers (group N) were used as controls. The mean level of PI in group N shows 0.82. PI in group A was increased to 1.04, and in group V, 1.27. Furthermore in the brain death group, the mean level of PI was increased to 3.86, which was statistically significant. It was concluded that measurement of PI was very useful to evaluate the changes of cerebral hemodynamics, and the levels of PI was affected more with the changes in diastolic than in systolic flow velocity.

Adolescent↗

Withdrawing medical treatment: implications of the Bland case.

The question of whether it is possible to withdraw a feeding system from a patient who is in a persistent vegetative state raises serious legal and ethical issues which have recently been discussed in the High Court. This article discusses the issues and the Court's conclusions in this particular case.

Coma↗

Can child deaths be prevented? The Arizona Child Fatality Review Program experience.

OBJECTIVE: To determine the causes and preventability of child deaths; to assess the accuracy of death certificate information; and to assess the number of child abuse deaths that are misdiagnosed as deaths attributable to natural or accidental causes. METHODS: Analysis of deaths of children <18 years old that occurred between 1995-1999 using the data collected by the Arizona Child Fatality Review Program (ACFRP). RESULTS: From 1995-1999, local multidisciplinary child fatality review teams (CFRTs) have reviewed 95% of all deaths of children <18 years old in Arizona. Each team has access to the child's death certificate, autopsy report, hospital records, child protective services records, law enforcement reports, and any other relevant documents that provide insight into the cause and preventability of a child's death. After reviewing these documents, the team determines the cause of death, its preventability, and the accuracy of the death certificate. The ACFRP defines a child's death as preventable if an individual or the community could reasonably have done something that would have changed the circumstances that led to the child's death. The ACFRP determined that 29% (1416/4806) of these deaths could have been prevented, and preventability increased with the age of the child. Only 5% (81/1781) of neonatal deaths were considered preventable, whereas the deaths of 38% of all children older than 28 days were considered preventable. By 9 years of age, the majority of child deaths (56%) were considered preventable. Deaths attributable to medical conditions were far less likely to be considered preventable than deaths attributable to unintentional injuries. Although 62% of all deaths in Arizona during the 5-year period were attributable to medical conditions, only 8% (253/2983) of these deaths were considered preventable. In contrast, 91% (852/934) of the deaths attributable to unintentional injuries were considered preventable. Motor vehicle crashes accounted for 634 of the deaths resulting from injuries, and drowning accounted for 187 deaths. Motor vehicle crashes were the leading cause of death for all children in Arizona over 1 year of age. Only 18% of child passengers and 3% of adolescent drivers who died were known to be appropriately restrained. The typical drowning victim was a young child who drowned in the family's backyard pool. Indeed, 70% (131/187) of the drowning victims were <5 years old, and 62% (81/131) of these children died in a backyard pool. Supervision of the child and pool fencing could have prevented 90% of these deaths. Most deaths attributable to medical conditions occurred in the first year of life. Prematurity was the most common medical condition (1036 deaths) followed by congenital anomalies (662 deaths) and infectious diseases (470 deaths). Some of the reasons why CFRTs believed a medical death was preventable included inadequate emergency medical services, poor continuity of care, and delay in seeking care because of lack of health insurance. There were 4 deaths resulting from infections that were vaccine-preventable. There were 263 deaths attributable to sudden infant death syndrome. Only 38 of these infants were found lying on their back; 35 were found lying on their side. The death rate from sudden infant death syndrome decreased from 1.1 per 1000 infants <1 year of age in 1995 to 0.5 in 1999. There were 33 deaths that the CFRTs concluded were attributable to unsafe sleeping arrangements that resulted in unintentional suffocation. From 1995-1999, 317 Arizona children died from gun shot wounds. Most of these deaths were homicides (175) or suicides (109). All suicide deaths occurred in children >9 years old, and 77% of these children were >14 years old. The typical suicide victim was male (83%) and used a gun (70%) to kill himself. After review by the CFRTs, it was determined that 5 of the 67 child abuse deaths were misdiagnosed as attributable to natural or accidental causes on the death certificate. In 3 of these 5 cases, the child was in a persistent vegetative state and died many years after the episode of child abuse. Although inaction or inappropriate action by Child Protective Services (CPS) is often thought to be the cause of child abuse deaths, the ACFRP determined that in 79% of child abuse deaths, there had been no previous CPS involvement with the child's family. Although 61% of child abuse deaths were considered to be preventable, much of the responsibility for preventing these deaths rests with community members (eg, relatives, neighbors) who were aware of the abuse but failed to report the family to CPS. The CFRTs, who had received training in the proper completion of death certificates, reported that the cause of death was incorrect on 13% of all death certificates and in 16 cases, the CFRTs disagreed with the medical examiner on the manner of death (eg, natural, accidental, undetermined). Because CFRTs have access to additional information that may not have been available to the physician who completes a child's death certificate, CFRTs may be able to more accurately determine the cause and manner of death than the physician who completed the death certificate. CONCLUSIONS: Arizona's child death rate is above the national average (82.16/100 000), but the ACFRP determined that many of these deaths could have been prevented by using known prevention strategies (eg, child safety restraints, pool fencing). Most child mortality data are based on death certificate information that often is incorrect and cannot be used to assess preventability. Although most states have child fatality review programs that review suspected child abuse deaths, <3% of all preventable deaths in Arizona were attributable to child abuse. If all child deaths in the United States were reviewed from a prevention/needs assessment perspective, targeted and data-driven recommendations for prevention could be developed for each community, and potentially 38% of all child deaths that occur after the first month of life could be prevented. The ACFRP is an excellent example of a statewide system with a public health focus. To assist other states in developing similar programs, national support is needed. The establishment of a public health focused federally funded national program would provide us with the opportunity to standardize data collection among states and better utilize this data at a national level.

Accidents, Traffic↗

[Neurophysiological evaluation using multimodal sensory evoked potentials in patients in coma: general aspects].

Noninvasive sensory evoked potentials (SEP) performed at bedside in the Intensive Care Unit for patients in coma can be helpful in establishing both a diagnosis and a prognosis. Based on a more than 6-year experience on this subject, the authors discuss general aspects concerning these EP, their probable known generators, and propose a classification depicting different aspects observed for flash visual EP (F-VEP), brainstem auditory EP (BAEP), and median nerve somato-sensory EP (SSEP). Isolated, SSEP shows the best diagnostic and prognostic performance. Nevertheless, the authors consider that multimodality SEP are even better than any isolated EP study; cross-correlating information generated through a horizontal (F-VEP), a vertical (SSEP), and a pathway focusing brainstem in greater detail (BAEP) allows the neurophysiological establishment of the level of lesion in the CNS from a better perspective; besides, SEP can help setting the diagnosis of brain (encephalic) death, and the diagnosis of particular problems concerning each pathway. Notwithstanding, most important is prognosis definition, and the findings are summarized. Abnormal BAEP implies bad prognosis, as would be expected considering the severity of a brainstem lesion; on the other hand, a normal BAEP per se does not allow a precise definition, resting on other EP the role prognosis characterization. SSEP if bilaterally normal or only mildly abnormal imply good prognosis; bilateral absence of SSEP thalamo-cortical components has always carried a bad prognosis, since younger patients may at best evolve into a persistent vegetative state; SSEP intermediary results are more often accompanied by variable evolution. FVEP results parallel those of SSEP.

Coma↗

Herpes simplex virus type-2 encephalitis in peripartum period preceded by hepatitis.

Encephalitis by Herpes Simplex virus type-2 in adults is rare and has been described as part of a disseminated infection in settings of immunosuppression, pregnancy being one of them. The virus was isolated from CSF of a young female, who during puerperium, presented with hepatitis, encephalitis and subsequently developed persistent vegetative state. Case history of another woman at term pregnancy is described who had similar illness but virological proof could not be obtained.

Adult↗

Treatment of intraventricular hemorrhage using urokinase.

Four patients with severe intraventricular hemorrhage (IVH) were treated using urokinase administered into the lateral ventricles via a ventricular drainage catheter. All patients were female and of ages ranging from 24 to 53 years. The primary diseases were hemorrhagic infarction, moyamoya disease, sinus thrombosis, and thalamic bleeding. Urokinase administration was initiated at 1.3 days average after occurrence of IVH and continued for 3.3 days average in doses of 12,000-96,000 IU per day. Average clot lysis times from IVH, as assessed by computed tomography, were 5.0 +/- 0.8, 5.0 +/- 1.4, and 6.0 +/- 0.8 days for the fourth, the third, and the lateral ventricles, respectively. All patients suffered from meningitis which was probably caused by urokinase administration through a ventricular catheter. However, this was successfully treated by changing the antibiotics. There was no general bleeding tendency or intraventricular rebleeding due to urokinase administration, and none of the ventricular catheters were obstructed by clots throughout the course. The final outcome was good recovery in two patients, severe disability in one, and persistent vegetative state in one. These results correlated well with the consciousness level seen before ventricular drainage in each patient. Consequently, we are convinced that urokinase administration can prevent the harmful effects of IVH and that urokinase is useful not only for lysing ventricular clots but also for maintaining the patency of the ventricular catheter, which is important for control of intracranial pressure in the acute stage of severe IVH.

Adult↗

Associated injuries and mechanism of atlanto-occipital dislocation caused by trauma.

Injuries associated with traumatic atlanto-occipital dislocation (AOD) leading to death were analyzed in 11 patients, nine injured by traffic accidents, of which five were victims of car-pedestrian accidents. On admission, unconsciousness and respiratory arrest were noted in all patients, and cardiac arrest in nine. Skull and cervical roentgenograms revealed enlargement of the retropharyngeal space due to injury of the vertebral artery or its branches in nine patients, atlanto-axial dislocation (C-1-C-2 separation) in four, and skull fracture in four. Computed tomography demonstrated subarachnoid hemorrhage (SAH) in the upper cervical and posterior fossa in nine patients, fourth ventricular hematoma in seven, and atlas fracture in three. SAH and ventricular hematoma were due to craniocervical injury. Other common injuries were injury of face and head excluding the mandibular region in 10 patients, mandibular fracture in three, severe chest injuries in eight, and intraperitoneal bleeding in two. The overall outcome was poor. Nine patients died within 13 hours of admission, one was diagnosed as brain dead 8 days after the accident, and the other one survived in a persistent vegetative state. Early death is probably caused by associated severe injuries, i.e. chest injuries and intraperitoneal bleeding rather than AOD. Although injury of the mandibular region is known to be associated with AOD, head, breast, and abdominal trauma may also lead to neck hyperextension-flexion in various directions. Whatever the direct cause, a distractive force to the craniocervical joint by hyperextension-flexion appears to be important in the mechanism of AOD.

Accidents, Traffic↗

Ruptured vertebral artery dissecting aneurysm associated with parent artery occlusion.

A 63-year-old hypertensive man presented with vertebral artery (VA) dissection manifesting as subarachnoid hemorrhage located mainly in the posterior fossa. Left vertebral angiography on the day of hemorrhage showed complete occlusion of the left VA. Right vertebral angiography showed retrograde filling of the distal portion of the left VA and the left posterior inferior cerebellar artery, and a "double lumen"-like finding in the left VA. He was managed conservatively. Follow-up angiography on Day 29 showed spontaneous recanalization of the occlusive lesion and an almost normal arterial configuration. T2-weighted magnetic resonance (MR) imaging on Day 45 revealed multiple infarctions in the brainstem. T1-weighted MR imaging showed a high intensity area, suggestive of intramural hematoma, in the left VA. He was transferred to another hospital in a persistent vegetative state.

Aneurysm, Ruptured↗

The effectiveness of coma arousal intervention.

Thirty-one patients who were in coma or persistent vegetative state two weeks after sustaining a severe head injury were entered into a coma arousal programme. The coma arousal protocol called for a sequence of vigorous multisensory stimulations to be applied to the patient by a relative for up to eight hours a day for seven days a week. An independent study team monitored two patient outcomes, the time taken to obey a simple command on two consecutive occasions 24 hours apart and patients' score on the Glasgow Outcome Scale 10-12 months post-injury. Outcomes were compared with an historical reference group chosen from the literature, consisting of 135 similarly classified patients. Differences between the pilot study and the reference group patients on initial characteristics suggested that the pilot study patients might have the more favourable outcomes, independent of treatment effect. The sample size was sufficient to detect a 40% improvement in recovery rate. No significant improvements were noted in either the time to obey a simple command (p greater than 0.2) or in the Glasgow Outcome Scale (p greater than 0.25), although the observed difference in the latter group was 11% in favour of the pilot study patients. This study was unable to find any evidence that coma arousal, for all its arduous patient contact, had a markedly better outcome compared with conventional treatment.

Adolescent↗

The PLEXUS parameters: results of the 'PLEXUS conference'.

Presentations by experts at an international conference on coma and persistent vegetative state (PVS) identified 32 parameters of varying prognostic significance that can be determined in this patient population. These parameters are tabulated for heuristic purposes and to summarize a portion of the information exchanged at this conference.

Brain Damage, Chronic↗

Relation of cerebral blood flow to neurological status and outcome in head-injured patients.

Noninvasive studies of regional cerebral blood flow (CBF) were performed on 36 head-injured patients in varying degrees of coma, using the intravenous xenon-133 method. Serial examinations, averaging four per patient, were begun during the acute phase of illness and continued until death of recovery of normal consciousness. Comparison of the initial and final studies revealed that CBF declined to very low levels in all nine patients who died, and remained subnormal in a patient with persistent vegetative state. In contrast, 25 of 26 patients who recovered consciousness showed increases in blood flow. Because of the presence of both reduced and elevated blood flows on the initial study, CBF was not predictive of outcome. Absolute or relative hyperemia, observed in nine acute cases, was associated with either diffuse cerebral swelling (observed on computerized tomography) or recovery from systemic shock. Cerebral metabolic studies in hyperemic patients yielded a very low oxygen uptake and arteriovenous oxygen difference, indicating that the high blood flow was a true "luxury perfusion." When instances of presumed luxury perfusion were excluded, CBF was positively correlated with level of consciousness, assessed on a four-point coma scale.

Adolescent↗

Prognosis of severe head injuries.

The authors have analyzed retrospectively a series of 288 consecutive patients with severe head injury observed between January, 1977, and May, 1980. Seventy-three patients were excluded as not being compatible with those of the International Data Bank. The remaining 215 patients complied with the definition of coma given by Jennett. All patients, after appropriate cardiopulmonary resuscitation, diagnostic measures, and, when required, surgical treatment, were managed in the Neurosurgical Intensive Care Unit with endotracheal intubation, controlled hyperventilation, mild dehydration, dexamethasone in standard doses, and sedation. The mortality rate was 39.5%. Of the survivors, 59.2% made a good recovery, 18.4% remained moderately disabled, 6.1% were severely disabled, and 1.5% were in a persistent vegetative state. The most reliable predictive criteria were: absence of brain-stem reflexes, neurological status, abnormal motor patterns, arterial hypotension, and presence of mass lesions. It is concluded that no sign has an absolute prognostic value when considered independently of its time course.

Adolescent↗

Cerebral circulation after head injury. Part 4: Functional anatomy and boundary-zone flow deprivation in the first week of traumatic coma.

A considerable body of evidence suggests that posttraumatic disturbances of the cerebral circulation contribute to poor neurological outcome after blunt head injury, especially when regional cerebral blood flow (rCBF) falls to the ischemic range (below 17 ml/100 gm/min). Cerebral infarction concentrated in the arterial boundary regions has been described in patients who died. Since arterial boundary zones are the cortical areas most susceptible to cerebral ischemia, the authors have investigated the relationship between neurological outcome and the anatomic pattern of rCBF values in the acute phase. The bolus-injection xenon-133 washout technique was used to measure rCBF in 35 regions of the hemisphere during the 1st week after head injury. Eighty-eight hemispheres were studied in 80 patients whose Glasgow Coma Scale (GCS) score was less than 8 on admission to the neurosurgical department. A characteristic pattern of rCBF was found in patients who later died of neurological complications, or who survived in a persistent vegetative state, with low flows in regions conforming to the arterial boundary zones. These patients also had lower average global cerebral blood flow (CBF), GCS scores, and cerebral perfusion pressure compared with those who recovered, with or without neurological deficits; the latter group had an rCBF pattern similar to that of normal individuals. There was little change in the GCS score between the time of hospital admission and CBF measurement, suggesting that the major neurological injury had occurred prior to admission. It was not possible to determine whether boundary-zone ischemia preceded neurological deterioration, but the rCBF pattern of boundary-zone flow deprivation was clearly related to poor neurological outcome. These observations suggest that elevated intracranial pressure and arterial hypotension were important etiological factors. Measures to protect regional cerebral perfusion should be instituted as early as possible after injury, preferably before the patient reaches the hospital.

Arteries↗

Long-term follow-up review of 31 children with severe closed head trauma.

Thirty-one children aged 3 to 15 years were followed for 5 to 11 years after suffering severe closed head trauma which caused coma for 1 week or more (median duration of coma 3 weeks). One patient remained in a persistent vegetative state until his death 9 years later. The other 30 recovered consciousness and were discharged. All suffered diminution of their abilities, and 24 of them had major permanent disability. The most common motor disabilities were pure spastic hemiparesis (seven cases), basal ganglia syndromes (four cases), ataxia (three cases), and a combination of hemiparesis and ataxia (five cases). Of the 30 patients, 26 regained independent ambulation, seven were epileptic, and 14 were dysarthric in various degrees. Only 10 had the cognitive ability to profit from the normal educational system, and none had attempted postsecondary education. Social problems were common. The worst outcomes were associated with intracranial bleeding and/or brain contusion seen on computerized tomography (CT) scans at the acute stage; the best were associated with normal CT scans. The degree of residual disability in these children seems no less than that of adults with trauma of similar severity.

Adolescent↗

Documented reversal of global ischemia immediately after removal of an acute subdural hematoma. Report of two cases.

The authors report two cases of severe head injury with acute subdural hematoma, in which cerebral blood flow (CBF) and cerebral blood volume (CBV) measurements were obtained prior to evacuation of the subdural hematoma and again immediately after removal. The first patient, a 21-year-old man with a motor response localizing to pain, had a global CBF of 18.2 ml/100 gm/min and a decreased global CBV of 3.7 ml/100 gm at 2.3 hours after injury. Immediately after removal of the subdural hematoma (8.1 hours after injury), CBF and CBV measurements revealed increases to 35.5 ml/100 gm/min and 5.8 ml/100 gm, respectively. The second patient, a 49-year-old woman with a normal flexor motor response to pain, had preoperative global values of 15.8 ml/100 gm/min for CBF and 2.0 ml/100 gm for CBV at 3 hours after injury. Postoperatively (9.3 hours after injury), the CBF and CBV values increased to 41.6 ml/100 gm/min and 4.0 ml/100 gm, respectively. The first patient, with only borderline ischemia and removal of the subdural hematoma within 3 hours, made a good recovery, while the second patient, with prolonged lower levels of CBF, remained in a persistent vegetative state. The low values of preoperative CBV argue for compression of the microcirculation as the cause of ischemia.

Adult↗

Surgical decompression for traumatic brain swelling: indications and results.

OBJECT: Decompressive craniectomy has been performed since 1977 in patients with traumatic brain injury. The authors assess the efficacy of this treatment and the indications for its use. METHODS: The clinical status of the 57 patients, their computerized tomography (CT) scans, and intracranial pressure (ICP) levels were documented prospectively in a standard protocol. At the beginning of the study, all patients older than 30 years were excluded. As of 1989 patients older than 40 years were excluded until 1991; since that time patients older than 50 years have been excluded. Primary brain or brainstem injury with fully developed bulbar brain syndrome, loss of auditory evoked potentials (AEPs), and/or oscillation flow in a transcranial Doppler ultrasound examination were contraindications to decompressive craniectomy. A positive indication for decompression was given in the case of progressive therapy-resistant intracranial hypertension in correlation with clinical (Glasgow Coma Scale [GCS] score, decerebrate posturing, dilating of pupils) and electrophysiological (electroencephalography, somatosensory evoked potentials, and AEPs) parameters and with findings on CT scans. Unilateral decompressive craniectomy was performed in 31 patients and bilateral craniectomy in 26 patients. In all cases, a wide frontotemporoparietal craniectomy was followed by a dura enlargement covered with temporal muscle fascia. The outcomes of the treatment were surprisingly good. Only 11 patients (19%) died, three of whom died of acute respiratory disease syndrome. Five patients (9%) survived, but remained in a persistent vegetative state; six patients (11%) survived with a severe permanent neurological deficit, and 33 patients (58%) attained social rehabilitation. Two patients (3.5%) did not have a follow-up examination. The GCS score on the 1st day posttrauma and the mean ICP turned out to be the best predictors for a good prognosis. The results demonstrate the importance of decompressive craniectomy in the treatment of traumatic brain swelling. CONCLUSIONS: Surgical decompression should be routinely performed when indicated before irreversible ischemic brain damage occurs.

Adolescent↗