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Purpose of Review: Critically ill children are at risk of neurologic dysfunction and acquiring primary and secondary brain injury. Close monitoring of cerebral function is crucial to prevent, detect, and treat these complications., Recent Findings: A variety of neuromonitoring modalities are currently used in pediatric and neonatal ICUs. These include noninvasive modalities, such as electroencephalography, transcranial Doppler, and near-infrared spectroscopy, as well as invasive methods including intracranial pressure monitoring, brain tissue oxygen measurement, and cerebral microdialysis. Each modality offers unique insights into neurologic function, cerebral circulation, or metabolism to support individualized neurologic care based on a patient's own physiology. Utilization of these modalities in ICUs results in reduced neurologic injury and mortality and improved neurodevelopmental outcomes., Summary: Monitoring of neurologic function can significantly improve care of critically ill children. Additional research is needed to establish normative values in pediatric patients and to standardize the use of these modalities., (Copyright © 2024 Wolters Kluwer Health, Inc. All rights reserved.)

Background: Parents of neonates with seizures report persistent symptoms of depression, anxiety, and posttraumatic stress. We aimed to characterize the parent experience of caring for children impacted by neonatal seizures, including longitudinal assessment across childhood., Methods: This prospective, observational, multicenter study was conducted at Neonatal Seizure Registry (NSR) sites in partnership with the NSR Parent Advisory Panel. Parents completed surveys at discharge; 12, 18, and 24 months; and 3, 4, 5, 7, and 8 years. Surveys included demographic information and open-ended questions targeting parent experience. A conventional content analysis approach was used., Results: A total of 320 caregivers completed at least one open-ended question, with the majority of respondents at discharge (n = 142), 12 months (n = 169), 18 months (n = 208), and 24 months (n = 245). We identified the following three primary themes. (1) Personal Burden of Care: Parents experienced emotional distress, financial strain, physical demands, and fears for their child's unknown outcome; (2) Managing Day-to-Day Life: Parents described difficulties navigating their parenting role, including managing their child's challenging behaviors and understanding their child's needs amid neurodevelopmental impairment; (3) My Joys as a Parent: Parents valued bonding with their child, being a caregiver, and watching their child's personality grow., Conclusions: Parents of children impacted by neonatal seizures face persistent challenges, which are interwoven with the joys of being a parent. Our findings suggest that future interventions should promote resiliency, address caregivers' psychosocial needs longitudinally, and provide enhanced support for parents caring for children with medical complexity., Competing Interests: Declaration of Competing Interest Dr. Monica Lemmon receives funding from NIH (K23NS116453). Dr. Reneé Shellhaas receives royalties from UpToDate for authorship on topics related to neonatal seizures and serves as a consultant for the Epilepsy Study Consortium. Betsy Pilon is the Executive Director of Hope for HIE. The other authors have no disclosures to report., (Copyright © 2024 Elsevier Inc. All rights reserved.)

Objective: To evaluate whether abnormal sleep is associated with adverse outcomes for children who survived acute provoked neonatal seizures, and their parents., Study Design: This 9-center study prospectively followed newborns with acute provoked seizures. When children reached age 5 years, parents completed the Children's Sleep Habits Questionnaire (CSHQ), the Pediatric Sleep Questionnaire-Sleep Related Breathing Disorders (PSQ-SRBD) subscale, the Vineland Adaptive Behavior Scales-3, and the Hospital Anxiety Depression Scale. Children were also assessed with the Wechsler Preschool and Primary Scale of Intelligence-IV (WPPSI-IV). Spearman correlations and multivariable analyses were used to evaluate risk factors for sleep problems., Results: The mean CSHQ score was 45 ± 7; 77 of 118 children (65%) had an abnormal score (above the healthy sleep threshold of 41). On the PSQ-SRBD, 32 of 119 children (27%) screened positive for sleep-disordered breathing (SDB). SDB symptoms were more common among children with cerebral palsy (42% with vs 22% without; P = .03) and epilepsy (54% with vs 24% without; P = .02). Children with lower scores on the Vineland-3 (rho = -0.25; P = .01) and WPPSI-IV (rho = -0.31; P = .004) at 5 years of age were more likely to have symptoms of SDB. Worse CSHQ and PSQ-SRBD scores were associated with higher parental anxiety (rho = 0.28 [P = .002] and rho = 0.34 [P = .0002], respectively) and depression scores on the Hospital Anxiety Depression Scale (rho = 0.16 [P = .08] and rho = 0.17 [P = .07], respectively)., Conclusions: Two-thirds of early school-aged survivors of acute provoked neonatal seizures had parent-reported sleep abnormalities and one-quarter screened positive for SDB. Early screening and effective treatment for sleep disorders could be an innovative, practice-changing approach to improve outcomes after neonatal seizures., Competing Interests: Declaration of Competing Interest Renée Shellhaas reports financial support for this study was provided by National Institute of Neurological Disorders and Stroke and the Patient-Centered Outcomes Research Institute. Renée Shellhaas reports a relationship with Pediatric Epilepsy Research Foundation that includes: board membership and employment. Renée Shellhaas reports a relationship with The Epilepsy Study Consortium that includes: consulting or advisory. Renée Shellhaas reports a relationship with UptoDate Inc that includes: royalties for authorship of topics related to neonatal seizures. All other authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 The Authors. Published by Elsevier Inc. All rights reserved.)

Background: Neonatal seizures are common with acute brain injury. Up to 25% of survivors develop postneonatal epilepsy. We hypothesized postneonatal epilepsy diagnosed by age 24 months would increase risk for early markers of neurobehavioral disorders than acute provoked neonatal seizures alone., Methods: Neonates with acute provoked seizures born from July 2015 to March 2018 were enrolled at nine Neonatal Seizure Registry sites. Composite scores from parent-completed standardized ratings assessed Adaptive, Social, Externalizing, Internalizing, Self-Regulation, and Sensory Seeking domains. Linear regression demonstrated relationships between composite scores for children who developed postneonatal epilepsy compared with those who did not. Results were adjusted for seizure etiology, sex, gestational age, and cerebral palsy (CP) severity., Results: A total of 151 children (n = 20, 13% with postneonatal epilepsy), 4.1 years median age, participated. Children with epilepsy had impaired adaptive (Cohen d = 1.62, P < 0.0001), social (Cohen d = 0.86, P = 0.004), and executive functioning (Cohen d = 0.56, P = 0.06) compared with children without epilepsy. Mean scores for children without epilepsy were within average range. Risk for impairment among children with epilepsy persisted after adjusting for neonatal seizure etiology, sex, and gestational age, but not when adjusting for CP severity., Conclusions: There was higher incidence of adverse neurobehavioral outcomes among preschool children diagnosed with postneonatal epilepsy compared with those without epilepsy. CP severity was associated with greater impairment; results also suggest that epilepsy is an independent predictor of adaptive functioning. Children with postneonatal epilepsy should be screened for neurobehavioral problems to facilitate early identification and developmental support., Competing Interests: Declaration of competing interest Dr. Shellhaas receives royalties from UpToDate for authorship of topics related to neonatal seizures, serves as a consultant for the Epilepsy Study Consortium, and receives a stipend for her role as president-elect of the Pediatric Epilepsy Research Foundation. The other authors declare no competing interests., (Copyright © 2024 Elsevier Inc. All rights reserved.)

Extracorporeal membrane oxygenation (ECMO) is a high-risk and low-volume life support with increasing clinical study. However, heterogenous outcome definitions impede data assimilation into evidence to guide practice. The Academic Research Consortium (ARC), an international collaborative forum committed to facilitating the creation of stakeholder-driven consensus nomenclature and outcomes for clinical trials of medical devices, supported the ECMO Core Elements Needed for Trials Regulation And quality of Life (ECMO-CENTRAL) ARC. The ECMO-CENTRAL ARC was assembled to develop definitions of paediatric ECMO adverse events for use in clinical trials and regulatory device evaluation. An initial candidate list of ECMO adverse events derived from the mechanical circulatory support ARC was supplemented with a review of ECMO-relevant adverse event definitions collated from literature published between Jan 1, 1988, and Feb 20, 2023. Distinct teams of international topic experts drafted separate adverse event definitions that were harmonised to existing literature when appropriate. Draft definitions were revised for paediatric ECMO relevance with input from patients, families, and an international expert panel of trialists, clinicians, statisticians, biomedical engineers, device developers, and regulatory agencies. ECMO-CENTRAL ARC was revised and disseminated across research societies and professional organisations. Up to three rounds of internet-based anonymous surveys were planned as a modified Delphi process. The expert panel defined 13 adverse event definitions: neurological, bleeding, device malfunction, acute kidney injury, haemolysis, infection, vascular access-associated injury, non-CNS thrombosis, hepatic dysfunction, right heart failure, left ventricular overload, lactic acidaemia, and hypoxaemia. Definitional structure varied. Among 165 expert panel members, 114 were eligible to vote and 111 voted. Consensus was achieved for all proposed definitions. Agreement ranged from 82% to 95%. ECMO-CENTRAL ARC paired rigorous development with methodical stakeholder involvement and dissemination to define paediatric ECMO adverse events. These definitions will facilitate new research and the assimilation of data across clinical trials and ECMO device evaluation in children., Competing Interests: Declaration of interests PMAA reports institution funding from the US Department of Defense (PRMRP clinical trial award #W81XWH2210301), National Institutes of Health (NIH R13HD104432), and the US Food and Drug Administration (FDA Grant Number U01FD004979/U01FD005978); and is the Treasurer for Extracorporeal Life Support Organization (ELSO). MDN is a member of the advisory board for Eurosets and a member of the European ELSO Chapter Steering Committee. MVA, NB, and LV are members of the European ELSO Chapter Steering Committee. DB received research support and consulting fees from LivaNova; has been on medical advisory boards for Xenios, Medtronic, Inspira, and Cellenkos; is the President-Elect of ELSO and the Chair of the Executive Committee of the International ECMO Network (ECMONet); and writes for UpToDate. RG-G is a member of the Latin American ELSO Chapter Steering Committee. PMK is a member or the Southwest Asia and Africa ELSO Chapter Steering Committee. GM is President of ELSO. MLP is the Past President of ELSO. AR-P is a consultant for Terumo CVS; and his institution receives funding from the NIH (R01 HL141509 and R01 HL155100). AL is a consultant for Bayer, Abbott, Abiomed, Berlin Heart, and Syncardia; is the primary investigator for the Berlin ACTIVE driver trial; and is an Executive of the ACTION Network. RPB reports a grant from the NIH (R01 HL153519) and is a member of the ELSO Board of Directors and Co-Chair of PediECMO., (Copyright © 2024 Elsevier Ltd. All rights reserved, including those for text and data mining, AI training, and similar technologies.)

Neonates are susceptible to seizures due to their unique physiology and combination of risks associated with gestation, delivery, and the immediate postnatal period. Advances in neonatal care have improved outcomes for some of our most fragile patients, but there are persistent challenges for epileptologists in identifying neonatal seizures, diagnosing etiologies, and providing the most appropriate care, with an ultimate goal to maximize patient outcomes. In just the last few years, there have been critical advances in the state of the science, as well as new evidence-based guidelines for diagnosis, classification, and treatment of neonatal seizures. This review will provide updated knowledge about the pathophysiology of neonatal seizures, classification of the provoked seizures and neonatal epilepsies, state of the art guidance on EEG monitoring in the neonatal ICU, current treatment guidelines for neonatal seizures, and potential for future advancement in treatment., Competing Interests: The author(s) declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article., (© The Author(s) 2024.)

Critically ill children with acute neurologic dysfunction are at risk for a variety of complications that can be detected by noninvasive bedside neuromonitoring. Continuous electroencephalography (cEEG) is the most widely available and utilized form of neuromonitoring in the pediatric intensive care unit. In this article, we review the role of cEEG and the emerging role of quantitative EEG (qEEG) in this patient population. cEEG has long been established as the gold standard for detecting seizures in critically ill children and assessing treatment response, and its role in background assessment and neuroprognostication after brain injury is also discussed. We explore the emerging utility of both cEEG and qEEG as biomarkers of degree of cerebral dysfunction after specific injuries and their ability to detect both neurologic deterioration and improvement., (© 2023. Springer Science+Business Media, LLC, part of Springer Nature and Neurocritical Care Society.)

Background: Continuous electroencephalography (cEEG) is commonly used for neuromonitoring in pediatric intensive care units (PICU); however, there are barriers to real-time interpretation of EEG data. Quantitative EEG (qEEG) transforms the EEG signal into time-compressed graphs, which can be displayed at the bedside. A survey was designed to understand current PICU qEEG use., Methods: An electronic survey was sent to the Pediatric Neurocritical Care Research Group and Pediatric Status Epilepticus Research Group, and intensivists in 16 Canadian PICUs. Questions addressed demographics, qEEG acquisition and storage, clinical use, and education., Results: Fifty respondents from 39 institutions completed the survey (response rate 53% [39 of 74 institutions]), 76% (37 of 50) from the United States and 24% (12 of 50) from Canada. Over half of the institutions (22 of 39 [56%]) utilize qEEG in their ICUs. qEEG use was associated with having a neurocritical care (NCC) service, ≥200 NCC consults/year, ≥1500 ICU admissions/year, and ≥4 ICU EEGs/day (P < 0.05 for all). Nearly all users (92% [24 of 26]) endorsed that qEEG enhanced care of children with acute neurological injury. Lack of training in qEEG was identified as a common barrier [85% (22 of 26)]. Reviewing and reporting of qEEG was not standard at most institutions. Training was required by 14% (three of 22) of institutions, and 32% (seven of 22) had established curricula., Conclusions: ICU qEEG was used at more than half of the institutions surveyed, but review, reporting, and application of this tool remained highly variable. Although providers identify qEEG as a useful tool in patient management, further studies are needed to define clinically meaningful pediatric trends, standardize reporting, and enhance educate bedside providers., (Copyright © 2023 Elsevier Inc. All rights reserved.)

Clinical guidance on outpatient follow-up of children hospitalized with acute neurologic complications of SARS-CoV2 infection is needed. We describe the clinical infrastructure of our pediatric neurology post-Covid clinic, including our clinical evaluation and cognitive testing battery specific to this patient population, and a case series of our initial patient cohort. Our findings demonstrate cognitive sequelae in all 4 of our patients months following acute SARS-CoV2 infection with neurologic complications including acute disseminated encephalomyelitis, posterior reversible encephalopathy syndrome, viral encephalitis, and gait difficulties. Verbal and executive function domains were predominantly affected in our cohort, even in patients who did not endorse symptomatic or academic complaints at follow-up. Our recommendations include systematic clinical follow-up for children following hospitalization with SARS-CoV2 infection with a comprehensive cognitive battery to monitor for cognitive sequalae and to assist with developing an individualized education plan for the child as they return to school.

Airborne pollen is a major contributor to allergic respiratory diseases. However, the literature on patterns and seasonality of specific pollen types mainly comes from northern hemisphere and developed regions, limiting our ability to extrapolate these findings to other geographical locations. With this research letter, our aim is to contribute to the current knowledge of aerobiology by analyzing the decade-long patterns of airborne tree pollen in the city of Bahia Blanca, Argentina. In general, we found late winter to early spring as the period with the highest Cupressaceae pollen counts. In 2020, the average pollen count during July through September was 78.81 (SD 79.70), the highest recorded during the last 10 years. These months had varying pollen concentrations from moderate (15-89 grains/m 3 of air) to high (90-1499 grains/m 3 of air). Regardless of such variation, August had consistently been the month with the highest peak concentrations from 2010 to 2020 (61.2, SD 57.3), followed by September (27.1, SD 20.3). We did not find any month with very high (˃1500 grains/m 3 of air) peak concentration. Further studies need to be done to expand our knowledge on aerobiology to characterize specific pollen sub-types and determine the exact allergenic potential of airborne pollen in different regions., Competing Interests: The authors declare no potential conflicts of interest with respect to research, authorship, and/or publication of this article.

Objective: To describe existing pediatric acute stroke protocols to better understand how pediatric centers might implement such pathways within the context of institution-specific structures., Study Design: We administered an Internet-based survey of pediatric stroke specialists. The survey included questions about hospital demographics, child neurology and pediatric stroke demographics, acute stroke response, imaging, and hyperacute treatment., Results: Forty-seven surveys were analyzed. Most respondents practiced at a large, freestanding children's hospital with a moderate-sized neurology department and at least 1 neurologist with expertise in pediatric stroke. Although there was variability in how the hospitals deployed stroke protocols, particularly in regard to staffing, the majority of institutions had an acute stroke pathway, and almost all included activation of a stroke alert page. Most institutions preferred magnetic resonance imaging (MRI) over computed tomography (CT) and used abbreviated MRI protocols for acute stroke imaging. Most institutions also had either CT-based or magnetic resonance-based perfusion imaging available. At least 1 patient was treated with intravenous tissue plasminogen activator (IV-tPA) or mechanical thrombectomy at the majority of institutions during the year before our survey., Conclusions: An acute stroke protocol is utilized in at least 41 pediatric centers in the US and Canada. Most acute stroke response teams are multidisciplinary, prefer abbreviated MRI over CT for diagnosis, and have experience providing IV-tPA and mechanical thrombectomy. Further studies are needed to standardize practices of pediatric acute stroke diagnosis and hyperacute management., (Copyright © 2021 Elsevier Inc. All rights reserved.)

Objective: To evaluate whether features of the early electroencephalographic (EEG) background could guide the optimal duration of continuous video EEG monitoring for seizure detection in newborn infants treated with therapeutic hypothermia for hypoxic ischemic encephalopathy (HIE)., Study Design: Retrospective cohort study of 114 consecutive infants treated with therapeutic hypothermia for moderate to severe HIE at a level IV neonatal intensive care unit (NICU) between 2012 and 2018. All infants were monitored with continuous video EEG through cooling and rewarming. Archived samples from the first 24 hours of these EEG traces were reviewed systematically and classified by background characteristics., Results: Electrographic seizures occurred in 56 of the 114 infants (49%). Seizure onset was within the first 24 hours after initiation of continuous video EEG in 49 if these 56 infants (88%), between 24 and 48 hours in 4 infants (7%), and >72 hours in 3 infants (5%). Infants with a normal or mildly abnormal EEG background either had seizure onset within the first 24 hours or never developed seizures. Four patients with seizure onset between 24 and 48 hours had markedly abnormal EEG backgrounds. The 3 patients with seizure onset beyond 72 hours had moderate or severely abnormal early continuous video EEG backgrounds., Conclusions: The use of early continuous video EEG background categorization may be appropriate to guide the duration of continuous video EEG for infants with HIE treated with therapeutic hypothermia. Some infants may reasonably be monitored for 24 hours rather than throughout cooling and rewarming without a significant risk of missed seizures. This could have significant implications for continuous video EEG resource utilization., (Copyright © 2020 Elsevier Inc. All rights reserved.)

Targeted temperature management encompasses a range of clinical interventions to regulate systemic temperature, and includes both induction of varying degrees of hypothermia and fever prevention ("targeted normothermia"). Targeted temperature management plays a key role in the contemporary management of critically ill neonates and children with acute brain injury. Yet, many unanswered questions remain regarding optimal temperature management in pediatric neurocritical care. The introduction highlights experimental studies that have evaluated the neuroprotective efficacy of therapeutic hypothermia and explored possible mechanisms of action in several brain injury models. The next section focuses on three major clinical conditions in which therapeutic hypothermia has been evaluated in randomized controlled trials in pediatric populations: neonatal hypoxic-ischemic encephalopathy, postcardiac arrest encephalopathy, and traumatic brain injury. Clinical implications of targeted temperature management in pediatric neurocritical care are also discussed. The final section examines some of the factors that may underlie the limited neuroprotective efficacy of hypothermia that has been observed in several major pediatric clinical trials, and outlines important directions for future research., (Copyright © 2018 Elsevier Inc. All rights reserved.)

Objectives: We assessed neuroactive medication use in critically ill children who require neurological consultation and evaluated the associations between administration of these medications and continuous electroencephalography (cEEG) utilization and seizure frequency., Methods: We evaluated exposure to sedatives, analgesics, anesthetics, and paralytics in consecutive patients (0 days to 18 years) for whom neurological consultation was requested in three intensive care units (ICUs) [neonatal (NICU), pediatric (PICU), and cardiothoracic (PCTU)]) at one children's hospital. We assessed cEEG usage and seizure incidence in relation to drug exposure., Results: From November 2015 to November 2016, 300 consecutive patients were evaluated (93 NICU, 139 PICU, and 68 PCTU). Ninety-seven (32%) were receiving ≥1 sedative infusion at the time of consultation [NICU 7 (8%), PICU 50(36%), PCTU 40 (58%%]; 91 (30%) received ≥1 paralytic agent within the preceding 24 hours. Continuous electroencephalography was performed more often for patients treated with sedative infusions (81 of 97 versus 133 of 203, P = 0.001) and paralytic medications (80 of 91 versus 134 of 209, P < 0.001) within 24 hours preceding consultation than those who were not. Sixty-eight of 214 (32%) had electrographic seizures (65 of 68 within initial 24 hours of monitoring); seizures were less common among patients who had received sedative infusions (18 of 81 versus 51 of 133, P = 0.014). In multivariable analysis of seizure likelihood, only younger age was associated with increased risk (P = 0.037)., Conclusions: Critically ill infants and children are frequently treated with sedatives, anesthetics, analgesics, and paralytics. Neuroactive medications limit bedside neurological assessments and, in this cohort, were associated with increased cEEG usage. Our data underscore the need to study the effect of these medications on clinical care and long-term outcomes., (Copyright © 2018 Elsevier Ltd. All rights reserved.)

Objective: to understand the experiences of parents of children and adolescents with cancer undergoing treatment., Method: qualitative research, based on Heidegger's existential phenomenology, in which 13 parents of eight patients under 19 years of age, assisted by a charity association, were interviewed., Results: three topics resulted from the analysis: "Experiencing the unpleasantness of the treatment"; "Fearing the possibility of a frightening situation" and "Experiencing the carelessness of another person". It was showed that during and after the treatment, the parents experience the fear of the unknown and the uncertainty of the future of their children, especially as they witness the death of other children; they also experience the indifference of professionals working in the local healthcare units and feel helpless and insecure., Conclusion: It is essential that the healthcare professionals, particularly the nurses, reflect about their care actions focused on the parents of children with cancer, recognizing their existential needs with the purpose of assisting them in their situation.

This is a qualitative study, based on Heidegger's existential phenomenology, with the purpose of revealing the meaning of death/dying for freshmen students of the nursing program. The study was developed in a public university in the northwest of Paraná, Brazil between August and October 2010, and 33 entering students from a Nursing program were interviewed. The following existential themes emerged from the phenomenological analysis: "Understanding death as a difficult process to be understood"; "Understanding death as a natural process"; and "Perceiving death as a passage to another life". The present study allowed to understand that knowledge and death are entangled in the temporality and the historicity of every being, which requires a scientific, ethical and philosophical understanding of the death/dying phenomenon so that the scholar may prepare for the humanized care of the patient and his/her family.

Thirty-four patients who were resistant to conventional doses of lidocaine received procainamide intravenously according to a pharmacokinetically designed two infusion technique. A mean peak serum concentration of 7.1 mg/liter was achieved with an average loading dose of 989 mg administered over 1 hour. A mean steady state serum concentration of procainamide of 6.5 mg/liter was achieved with a mean dose of 64.4 mg/kg body weight for the first 24 hours of treatment. Dose, renal impairment, the degree of congestive heart failure and acetylator status influenced the steady state serum concentration of procainamide. Dangerous ventricular arrhythmias were abolished in 74% of the patients at a steady state level of 6.9 +/- 3.7 mg/liter (mean +/- standard deviation). Nonresponders to procainamide had a mean steady state serum concentration of procainamide of 4.2 +/- 2.1 mg/liter (P less than 0.05). Systolic and diastolic blood pressures decreased moderately (10 and 8%, respectively), and heart rate decreased 11%. The infusion was interrupted in one patient because of hypotension. The duration of electrocardiographic conduction intervals was increased slightly in some patients. It is concluded that procainamide administered by this two infusion method is effective and well tolerated by most patients.

Isoelectrofocusing on polyacrilamide gel in the analysis of cerebrospinal fluid proteins is particularly suitable for investigations of gamma-globuline changes in the course of various neurological conditions. This technique makes it possible to recognise three patterns besides the normal one. The first is characterized by a diffuse increase in gamma-globulines with a great number of high density fractions showing uniform distribution in the alkaline pH area. It was observed in a case of Guillain-Barrè syndrome and in two cases of intramedullary tumours. It seems to be due to an alteration in the permeability of the blood-brain barrier. The second pattern shows a diffuse increase in the number of fractions and appears uneven owing to a certain amount of higher density bands which stand out clearly. This was observed in one case of tubercolous meningo-encephalytis, in one case of chickenpox encephalytis and one case of cryptococcal meningitis in a patient affected by lymphogranuloma. This pattern is probably due to an alteration of blood-brain as well as of immunological systems. The third pattern presents a clear fractionation of gamma-globulins gathered in a certain number of highly coloured bands, mainly in the most alkaline area of gel. This was observed in all the ten cases of multiple sclerosis and in the only case of subacute sclerosing panencephalitis. This may be attributed to the intrathecal production of oligoclonal gamma-globulines (Ig.G.).