The diagnostic significance of video-EEG monitoring findings on pseudoseizure patients differs between neurologists and psychiatrists

PURPOSE

The diagnosis of psychogenic pseudoseizures has improved with the availability of video-electroencephalography (EEG) monitoring; however, the outcome of this difficult disorder has remained poor. In an attempt to elucidate factors contributing to this poor outcome, we hypothesized that neurologists and psychiatrists differ in their views of the diagnosis and management of psychogenic pseudoseizure patients.

METHODS

The hypothesis was tested by using a brief anonymous questionnaire administered to neurologists and psychiatrists at continuing medical education (CME) conferences.

RESULTS

We found that neurologists and psychiatrists differ significantly in their opinion as to the accuracy of the video-EEG procedure; psychiatrists view video-EEG as often inaccurate in the diagnosis of psychogenic pseudoseizures compared with neurologists (p < 0.001). Neurologists, more frequently than psychiatrists, thought that patients' own psychopathology rather than "doctors dropping the ball" was a predominant factor in contributing to therapeutic failure, but this difference between specialties did not reach statistical significance.

CONCLUSIONS

Resolving the differences between neurologists and psychiatrists would be helpful in caring for psychogenic pseudoseizure patients. These results support the need to encourage psychiatrists to have an integral involvement in epilepsy centers and to improve the understanding of psychogenic pseudoseizures in both disciplines.

Outcome in psychogenic nonepileptic seizures: 1 to 10-year follow-up in 164 patients

Our knowledge of longer term outcome in psychogenic nonepileptic seizures (PNESs) patients is limited; we know less still about factors predicting prognosis. This study was intended to describe outcome in a large cohort and to identify predictive clinical and psychological factors to generate new ideas for treatment. One hundred sixty-four adult patients with PNESs (66.7%) responded to outcome, personality, and psychosymptomatology questionnaires (Dimensional Assessment of Personality Pathology-Basic Questionnaire [DAPP-BQ], Dissociative Experiences Scale, and Screening Test for Somatoform Symptoms) a mean of 11.9 years after manifestation and 4.1 years after diagnosis of PNES. Additional clinical data were retrieved from hospital records. The responses showed that 71.2% of patients continued to have seizures and 56.4% were dependent on social security. Dependence increased with follow-up. Outcome was better in patients with greater educational attainments, younger onset and diagnosis, attacks with less dramatic features, fewer additional somatoform complaints, and lower dissociation scores. Better outcome was associated with lower scores of the higher order personality dimensions "inhibitedness," "emotional dysregulation," and "compulsivity" but not "dissocial behavior" (DAPP-BQ). Outcome in PNESs is poor but variable. Clinical and personality factors can be used to provide an individualized prognosis. By generating a patient-specific profile, they show particular maladaptive traits or tendencies that can identify goals for psychological therapy.

An evidence and consensus based guideline for the management of a child after a seizure

OBJECTIVE

An evidence and consensus based guideline for the management of the child who presents to hospital having had a seizure. It does not deal with the child who is still seizing. The guideline is intended for use by junior doctors, and was developed for this common problem (5% of all paediatric medical attenders) where variation in practice occurs.

OPTIONS

Assessment, investigations (biochemistry, lumbar puncture, serum anticonvulsant levels, EEG in particular), and/or admission are examined.

OUTCOMES

The guideline aims to direct junior doctors in recognising those children who are at higher risk of serious intracranial pathology including infection, and conversely to recognise those children at low risk who are safe to go home.

EVIDENCE

A systematic review of the literature was performed. Articles were identified using the electronic data bases Medline (from 1966 to June 1998), Embase (from 1980 to June 1998) and Cochrane (to June 1998), and selected if they investigated the specified clinical question. Personal reviews were excluded. Selected articles were appraised, graded, and synthesised qualitatively. Statements of recommendation were made.

CONSENSUS

An anonymous, postal Delphi consensus development was used. A national panel of 30 medical and nursing staff regularly caring for these children were asked to grade their agreement with the statements generated. They were sent the relevant original publications, the appraisals, and literature review. On the second and third rounds they were asked whether they wished to re-grade their agreement in the light of other panellists' responses. Consensus was defined as 83% of panellists agreeing with the statement. Recommendations in brief: For afebrile seizures all children should have their blood pressure recorded, but no other investigations are routine although a seizing or somnolent child should have blood glucose measured; all children under 1 year should be admitted. For seizures with fever, clinical signs indicating the need to treat as meningitis are given. Children should be admitted if they are under 18 months old, have had a complex seizure, or after pretreatment with antibiotics.

VALIDATION

The guideline has undergone implementation and evaluation in a paediatric accident and emergency department, the results of which will be published separately. Only one alteration was made to the guideline as a result of this validation process, which is included here.

[Supratentorial cavernomas: clinical picture, diagnosis, treatment]

The study was undertaken to examine the clinical picture, diagnosis, morphology and substantiate management policy for patients with supratentorial cavernomas. Examination was made in 160 patients with this abnormality, 87 of them were operated on. The histological structure of cavernomas was shown to be heterogeneous. Different types of their clinical course are analyzed and the optimum diagnostic criteria of the diseases substantiated. Removal of supratentorial cavernomas is the method of choice, which eliminates a risk for rehemorrhage and positively affects the course of the convulsive syndrome. Exceptions are the cavernomas that are located in the functionally important brain regions difficult to reach. In these cases, the indication for surgery may be severe rehemorrhage or drug-untreated frequent seizures. Removal of cavernomas does not rule out a long-term use of anticonvulsants. They may be discontinued only on the basis of clinical and electroencephalographic control.

A comparison of clinical variables that predict adverse outcome in term infants with severe respiratory failure randomised to a policy of extracorporeal membrane oxygenation or to conventional neonatal intensive care

OBJECTIVE

To identify clinical variables predicting adverse outcome in a group of infants with severe respiratory failure who were randomized either to referral for extra-corporeal membrane oxygenation (ECMO) or to conventional neonatal intensive care within the United Kingdom.

METHODS

Adverse outcome was defined by death or disability by four years of age. Receiver operator characteristic (ROC) plots were constructed for variables with continuous data and relative risk (RR) with 95% confidence intervals (CI) calculated for binominal data.

RESULTS

Of variables measurable at trial entry, congenital diaphragmatic hernia and lower birthweight was also associated with increased mortality and morbidity. Seizures or supplementary oxygen at discharge were markers of disease course, which predicted a poorer outcome amongst survivors. These variables behaved similarly in the two trial groups. Those infants in the ECMO group with an episode of sepsis, established full sucking feeds after 14 days of age or a hospital stay over 30 days were at increased risk of disability.

CONCLUSIONS

This study has identified clinical variables that predict adverse outcome for term infants with severe respiratory failure. The results may assist clinicians caring for these babies, when counseling their families and in the development of guidelines for neonatal ECMO.

The role of nonpharmaceutic conservative interventions in the treatment and secondary prevention of epilepsy

Nonpharmacologic conservative treatments receive too little attention. Depending on the clinical condition of the patients, they may be used alone or in conjunction with other therapies. Their target is the single seizure rather than the epileptic condition as such. They belong mainly to one of three domains. NONSPECIFIC PREVENTION OF SEIZURES: The first step is the identification of factors facilitating the occurrence of seizures. In the second step, strategies to control these factors are developed. Most common are disturbances of the sleep-wake cycle, especially reduction of sleep. Patients should follow a regular sleep schedule with deviations of not >2 h. Sometimes a sleep calendar is helpful. Night shifts are not compatible with seizure prevention in these cases. Sleep disturbances as a facilitating factor of seizures are particularly common in juvenile idiopathic generalized epilepsies, in which their avoidance is in many cases an indispensable part of the therapeutic regimen, along with appropriate drug treatment. They are the most common precipitating factor in adolescents and adults with a first epileptic [mostly generalized tonic-clonic (GTC)] seizure. In these instances, their avoidance is central to the secondary prevention of epilepsy developing from the single seizure, whereas the prescription of antiepileptic drugs (AEDs) is rarely effective. Other nonspecific facilitators of seizures include uncontrolled use of alcohol and extraordinary stress. Patients must learn how to cope with stressful events. SPECIFIC PREVENTION OF SEIZURES: In reflex epilepsies, specific precipitants of seizures are the targets of interventions. Thus, most patients with primary reading epilepsy begin to have, with prolonged reading, perioral reflex myoclonias, which enable them to stop reading and thus to avoid a GTC seizure. In photosensitive patients, seizures are often precipitated by television. These can be avoided by viewing from a distance and using a remote control, small screens in a well-lit room, and preferably with a 100-Hz line shift. Environmental flicker stimulation often comes unexpectedly, and it is advisable that the patients always wear sunglasses in brightly lighted surroundings. Polarized glasses seem to be more protective than plain sunglasses. If the patient has only photically induced seizures, treatment by specific prevention alone may be sufficient, but if spontaneous seizures also occur, drugs must be given in addition. ARREST OF SEIZURES: Focal seizures that develop sufficiently slowly to leave the patient time to react may be interrupted by "countermeasures." These, again, may be nonspecific (acting by relaxation, concentration, or a combination of both) or specific. The latter are individually tailored, based either on spontaneous experiences of the patient or on the anatomy of ictogenesis. Seizure propagation is blocked when a major part of the neurons involved is activated and not recruitable for spread of the epileptic discharge. Seizure arrest rarely is used alone but usually in combination with partially successful pharmacotherapy.

Evaluation of the performance of general emergency physicians in pediatric emergencies: Obstructive airway diseases, seizures, and trauma

BACKGROUND

In the Lübeck region, as is usual in Germany, hospital-based emergency physicians are called for outside emergencies. They evaluate and stabilize patients and transfer them to hospital facilities of their choice (no emergency department system). These physicians are mainly anesthesiologists, surgeons, and internists-not pediatricians. Numerous quality management studies have shown an overall excellent performance of this system, but it has not been evaluated for pediatric emergencies.

PATIENTS AND METHODS

In a prospective, observational study conducted over a 1-year period, all pediatric emergencies (patient age < 15 y) treated by the emergency physician service were studied. A syllabus with standards of care for children with trauma, obstructive airway disease, and seizures was distributed. In accordance with this syllabus, the actions taken were documented by the emergency physicians, and the cases were documented as life threatening or not and were classified as "trauma," "obstructive airway disease," "seizures," or "other" by the admitting pediatric intensivists and surgeons. The admitting attending physician compared these data and evaluated whether the standard management required by the syllabus was followed.

RESULTS

A total of 422 pediatric cases out of 11,605 emergencies (3.5%) were recorded (147 [34.8%] trauma patients, 41 [9.7%] patients with obstructive airway disease, and 108 [25.6%] patients with seizures). Of the pediatric patients, 20.5% had life-threatening conditions; three children died before arrival, and the others required treatment in the intensive care unit. In 25% of trauma patients, deficiencies in primary treatment were observed: no documentation of neurologic status in 10.6%, no cervical immobilization in 15% of head trauma patients, and no adequate analgesia in 7%. In 25% of seizure patients, neurologic status was not documented, although treatment was in accordance with the standard of care. The worst results were observed in infants with obstructive airway disease: no documentation of oxygen saturation in 71.4%, no oxygen therapy despite hypoxemia in seven of 12 patients, and overall therapy not in accordance with the standard of care in 50%.

CONCLUSIONS

The high quality of the emergency physician service documented for adults is not reproduced in the pediatric population. Trauma and seizures with similarities to adult cases are handled in a fair manner. However, the most important pediatric diagnostic entity of obstructive airway disease is often not treated adequately. Intensified educational programs for emergency physicians are warranted.

Vagus nerve stimulation for treatment of medically intractable seizures. Evaluation of long-term outcome

Vagus nerve stimulation (VNS) constitutes an adjunctive, modern management of medically intractable seizures, especially when surgery is inadvisable.

OBJECTIVE

To evaluate the long-term results as regards efficacy, safety and tolerability of VNS in epileptic subjects, with focal and/or generalised seizures, refractory to old and new AEDs, without indication for resective surgery.

PATIENTS

51 epileptic subjects (30 males, 21 females), aged 7-49 years, have been implanted so far.

RESULTS

The results refer to the 47 subjects with a follow-up longer than 6 months. 22 (46.8%) of them had a greater than 50% reduction in seizure frequency, with a more than 75% reduction in 6. No significant difference was found in relation to type of seizures. The efficacy maintained steadily over time during the follow-up (mean 26.4 months). Twelve out of the 47 subjects had an improvement in alertness, attention and psychomotor activity. Complications were observed in 5 cases, leading to removal of the stimulator in 2. A moderate vocal hoarseness (40.4%), paresthesia (6.3%), pharingodinia and cough (4.3%) were the registered adverse events.

CONCLUSIONS

Our results confirm that VNS is effective, safe and well tolerated and constitutes an alternative treatment for pharmacoresistant epileptic seizures.

[Non epileptic psychogenic seizures]

INTRODUCTION

Non epileptic psychogenic seizures (NEPS) is a pathological condition that arouses the interest of many specialists due to the fact that, every day, it gives rise to problems in different fields especially in diagnosis and therapeutics. This means that sometimes the right diagnosis is reached after a period of explorations and treatment which later turn out to be unnecessary, and have important repercussions on the patient s family and social life, and, financially, on the health care system.

METHOD

We review the literature on the subject that has been published over the last five years, with the aim of contrasting and integrating the different positions that are currently held. We draw attention to the better known aspects, on which there is a more general agreement, and others that are still subject to controversy and debate; we also attempt to lay down a set of guidelines, bearing in mind the gaps that are still to be filled, to aid future research.

CONCLUSIONS

1. NEPS is very difficult to diagnose. It is important to have a good clinical history to be able to identify possible stressors. Video EEG can be of great help, although it is very expensive and not available to all Neurology services. 2. Before deciding on the final diagnosis, frontal, frontomesial and temporal lobe seizures must be taken into account since they sometimes present symptoms that are similar to those of NEPS. 3. The association with different psychiatric pathologies has been shown to exist, and more than one psychopathogenic mechanism may be involved as a mediator in the appearance of NEPS. 4. Therapy begins with the presentation of the diagnosis, which must be performed with due care and attention, and is aided by a multidisciplinary treatment.

Tremorgenic mycotoxicosis in four dogs from a single household

Mycotoxins are fungal metabolites that induce undesirable effects. The effects of these mycotoxins vary depending on the chemical structure of the toxin and degree of toxicity. Mycotoxins that induce muscle tremors, ataxia, and convulsions are termed tremorgenic mycotoxins. Our report documents the clinical course of 4 dogs from a single household that were simultaneously affected by tremorgenic mycotoxins. Diagnosis of tremorgenic mycotoxicosis was confirmed by stomach content analysis from 1 of the dogs. The mycotoxins identified were penitrem A and roquefortine, which are both produced by Penicillium spp. Treatment goals following tremorgenic mycotoxin ingestion include minimizing absorption, controlling tremors and seizures with methocarbamol and pentobarbital sodium administration, and providing supportive care. Two of the affected dogs required ventilatory support. With early aggressive treatment, prognosis is good and recovery is complete without sequelae. It is helpful for the clinician to be familiar with the typical clinical signs at the time of admission, treatment, and clinical course of dogs with tremorgenic mycotoxicosis.

The effectiveness of Hering's nerve stimulation in controlling penicillin-induced seizures in the rat is dependent on the amygdala

OBJECTIVE

This study tests the hypothesis that the ability of Hering's nerve stimulation (HNS) to blunt seizure activity is dependent on the availability of dopamine in the amygdala.

METHODS

In 10 rats, Hering's nerve (HN) on the right side was isolated and placed on an electrode and penicillin was locally placed on each rat's left frontoparietal region to induce seizures. After the initiation of seizures, HN was stimulated. After the recurrence of seizure activity, the left basolateral amygdala was injected with 1.0 microl of normal saline, dopamine, haloperidol or 1% lidocaine in sequential tests. HN was stimulated after each injection and the latency and amplitude of the seizure activity were assessed.

RESULTS

Focal cortical penicillin induced seizures that resulted in tonic-clonic movement of the limbs and face that lasted 35-45 min. Tonic-clonic movements of the limbs and face of similar latency and amplitude were induced by repeated reapplication of penicillin in untreated rats. HNS decreased seizure activity, but infusion of haloperidol or lidocaine into the basolateral amygdala blocked this antiseizure effect of HNS. In contrast, infusion of saline or dopamine had no effect on the ability of HNS to blunt seizure activity. None of the amygdala injections altered the latency or amplitude of seizure activity.

CONCLUSION

These results demonstrate that the ability of HNS to blunt seizure activity in the rat is dependent on an intact dopamine system in the basolateral amygdala. These data will hopefully be useful in furthering our understanding of the circuitry that allows peripheral nerve stimulation to alter seizure activity.

[Treatment of non-painful symptoms in terminally ill children]

The care of children at the end of life is gradually improving. Nevertheless, more than half suffer from intractable symptoms before dying. Although pain has been the subject of clinical research, evidence-based data are almost completely lacking for other symptoms, highlighting the need for clinical research in palliative care. We review the available evidence on fatigue, anorexia, dyspnea, respiratory secretions, cough, constipation, mouth dryness, urinary obstruction, terminal convulsions and gasping. When evidence is lacking, we offer our empiric approach. Short duration benzodiazepines have become an important component of treatment that should remain simple, while providing the dying child the comfort needed to experience the highest quality relationships with those around him.

Cortical representation of Hering's nerve: a possible anatomical pathway for seizure cessation following electrical stimulation

OBJECTIVE

We recently found that Hering's nerve stimulation (HNS) effectively blunts seizure activity. This study characterizes the cortical areas that are activated by HNS.

METHODS

Hering's nerve (HN) was stimulated in 3 dogs and 6 pigs, and then the brains of the animals were removed. The insular and mesial temporal cortices were removed and evaluated for increased neuronal activity by examining Fos-like activity.

RESULTS

In both the dogs and pigs, Fos activity was elevated in the anterior insular and mesial temporal cortices. Increased cortical activity was not noted in adjacent areas such as the frontal cortex.

CONCLUSION

This study demonstrates that the mesial temporal and anterior insular cortices are selectively activated by stimulation of HN, thus suggesting cortical loci at which HNS might blunt seizure activity.

Vagal stimulation for intractable seizures

Vagal stimulation has recently been approved for use in North America. Dr. Upton discusses the findings of a study conducted at the McMaster Medical Centre.