Continuous Electroencephalographic Monitoring Research Articles

A Bedside Screening Tool for Acute Intracranial Hemorrhages in Intubated Children using Continuous Quantitative Electroencephalography Monitoring

A Bedside Screening Tool for Acute Intracranial Hemorrhages in Intubated Children using Continuous Quantitative Electroencephalography Monitoring

Safety and Efficacy of Levetiracetam for Prevention of Epileptic Seizures in Acute Phase of Intracerebral Bleeding

Background: Epilepsy, characterized by recurrent, unprovoked seizures due to anomalous brain activity, is a significant complication for patients with intracerebral hemorrhage (ICH). The onset of epileptic convulsions during the acute phase of ICH can worsen the patient's prognosis and survival chances, making it crucial to identify a safe and effective method to prevent these seizures. Levetiracetam, a pyrrolidone derivative, is noted for its unique mechanism of action, exceptional tolerability, and advantageous pharmacokinetics, making it efficacious against various types of seizures. Objective: This study aims to evaluate the safety and efficacy of levetiracetam in preventing epileptic seizures during the acute phase of ICH and to determine its impact on neurological outcomes in this patient population. Methods: A cross-sectional investigation was conducted between October 2022 and June 2023 at Pak Emirates Military Hospital in Rawalpindi, Pakistan, involving 85 patients with spontaneous ICH confirmed by CT or MRI within 24 hours of symptom onset. Inclusion criteria included adult patients aged 18 or older, with various forms of ICH, excluding isolated subarachnoid hemorrhage, penetrating wound injury, depressed skull fracture, or early posttraumatic seizure. Patients with a Glasgow Coma Scale (GCS) score of less than 6, serum creatinine level >1.7 mg/dL, history of psychosis, unprovoked seizures, cerebrovascular accidents, traumatic brain injuries, or encephalitis within the previous three years were excluded. Patients were administered an initial loading dose of levetiracetam (1,000 to 1,500 mg), followed by a maintenance dose (500 to 1,500 mg every 12 hours) based on renal function. Continuous electroencephalography (cEEG) monitoring was used to detect seizures for at least the first 72 hours of hospital admission. The primary outcome was the incidence of epileptic seizures during hospitalization, while the secondary outcome was the patient's neurological status at discharge, assessed using the Modified Rankin Scale (mRS). Data were analyzed using descriptive statistics and the Chi-square test, with a p-value of ≤0.05 considered statistically significant. Analyses were conducted using SPSS version 25. Results: The mean age of the patients was 47.89 years (SD=7.46), with 62.35% male and 37.65% female. The mean GCS score at admission was 10.52 (SD=2.13), and the mean volume of ICH was 17.5 ml (SD=3.4). At baseline, 2.35% of patients had GCS scores of 3-5, which improved to 0% after treatment. The percentage of patients with GCS scores of 13-15 increased from 65.88% to 83.52% (p=0.3730). Seizures within the first 7 days occurred in 10.58% of patients, and the overall seizure incidence during hospitalization was 20%. At discharge, 9.41% of patients had an mRS score of 0, and the percentage of patients with an mRS score of 2 increased significantly from 18.18% to 37.64% (p=0.4086*). The percentage of patients with severe disability (mRS score of 5) significantly decreased from 22.72% to 5.68% (p=0.0094*). Conclusion: Levetiracetam is effective in improving neurological outcomes and reducing the incidence of seizures in patients with acute intracerebral hemorrhage, with a manageable safety profile. These findings suggest that levetiracetam can be a valuable addition to therapeutic strategies for managing ICH-related seizures, potentially enhancing patient care and improving health outcomes.

Evaluation of prognostic scores for status epilepticus in the neurology ICU: A retrospective study

ObjectiveStatus epilepticus (SE) in the neurology intensive care unit (ICU) is associated with significant morbidity. We aimed to evaluate the utility of existing prognostic scores, namely the Status Epilepticus Severity Score (STESS), Epidemiology Based Mortality Score in Status Epilepticus (EMSE)-EACE and Encephalitis-Nonconvulsive Status Epilepticus-Diazepam Resistance-Image Abnormalities-Tracheal Intubation (END-IT), among SE patients in the neurology ICU. MethodsNeurology ICU patients with SE requiring continuous electroencephalography (cEEG) monitoring over a 10 year period were included. The STESS, EMSE-EACE and END-IT scores were applied retrospectively. Receiver operating characteristic (ROC) analysis was performed to assess the discriminatory value of the scores for inpatient mortality and functional decline, as measured by increase in the modified Rankin Scale (mRS) on discharge. ResultsEighty-five patients were included in the study, of which 71 (83.5%) had refractory SE. Inpatient mortality was 36.5%. Sixty – seven (78.8%) of patients suffered functional decline, with a median mRS of 5 upon hospital discharge.The AUCs of the STESS, EMSE-EACE and END-IT scores associated with inpatient mortality were 0.723 (95% CI 0.613–0.833), 0.722 (95% CI 0.609–0.834) and 0.560 (95% CI 0.436–0.684) respectively. The AUCs of the STESS, EMSE-EACE and END-IT scores associated with functional decline were 0.604 (95% CI 0.468–0.741), 0.596 (95% CI 0.439–0.754) and 0.477 (95% CI 0.331–0.623). SignificanceSE was associated with high mortality and morbidity in this cohort of neurology ICU patients requiring cEEG monitoring. The STESS and EMSE-EACE scores had acceptable AUCs for prediction of inpatient mortality. However, the STESS, EMSE-EACE and END-IT were poorly-correlated with discharge functional outcomes. Further refinements of the scores may be necessary among neurology ICU patients for predicting discharge functional outcomes.

Prevalence of Electrographic Seizures in Hospitalized Patients With Altered Mental Status With No Significant Seizure Risk Factors Who Underwent Continuous EEG Monitoring: A Retrospective Study.

The objective of this study is to evaluate the prevalence of electrographic seizures in hospitalized patients with altered mental status and no significant risk factors for seizures. We retrospectively reviewed over a six-year period (2013-2019) the medical records of all adults admitted at Ohio State University Wexner Medical Center (OSUWMC), who underwent continuous electroencephalography (cEEG) monitoring for > 48 hours. Our primary objective was to identify the prevalence of electrographic seizures in patients with altered mental status and no significant acute or remote risk factors for seizures. A total of 1966 patients were screened for the study, 1892 were excluded (96.2%) and 74 patients met inclusion criteria. Electrographic seizures were identified in seven of 74 patients (9.45%). We found a significant correlation between electrographic seizures and a history of hepatic cirrhosis, n= 4 (57%), (p=0.035), acute chronic hepatic failure during admission, 71% (n=5), (p=0.027), and hyperammonemia (p =0.009). In this retrospective study of patients with altered mental status and no significant acute or remote risk factors for seizures who underwent cEEG monitoring for > 48 hours, electrographic seizures were identified in 9.45%. Electrographic seizures were associated with hepatic dysfunction and hyperammonemia. Based on our results, cEEG monitoring should be considered in patients with altered mental status and hepatic dysfunction even in the absence of other seizure risk factors.

Are circadian rhythms in disarray in patients with chronic critical illness?

The aim of our study is to assess circadian rhythms in patients with chronic critical illness due to severe brain injury in intensive care unit by establishing the relation between melatonin and cortisol secretion, considering astronomical time and the sleep-wake cycle in chronic critical illness. The study included 54 adult patients with chronic critical illness who resided in the intensive care unit for at least 30 days. The level of consciousness was determined using the CRS-R scale. We did the continuous electroencephalographic (EEG) monitoring with polygraphic leads for 24h. Also, we determined the serum levels of cortisol and melatonin using the tandem mass spectrometry method with ultra-performance liquid chromatography. 90.74% of patients had one acrophase in melatonin secretion curve, which suggests the preservation of the rhythmic secretion of melatonin. These acrophases of the melatonin rhythm occurred during the night time in 91.8% of patients. Most of the patients (69.3%) slept during the period from 2:00 to 4:00 a.m. The evening levels of cortisol and melatonin had an inverse relation (rs=0.61, p<0.05), i.e., a decrease in the level of cortisol secretion accompanies an increase in melatonin. We concluded from our study that the rhythmic secretion of melatonin and cortisol is preserved in patients with chronic critical illness that resulted from severe brain injury. No statistically significant discrepancy between melatonin and cortisol secretion, day-and-night time and the sleep-wake cycle are found. We may focus our future work on finding more reliable methods to stabilize the preservation of circadian rhythms to protect vital organ functions.

Incidence of postoperative seizures in neonates following cardiac surgery with regional cerebral perfusion and deep hypothermic circulatory arrest

ObjectivesHistorically, our center has primarily used deep hypothermic circulatory arrest, but in recent years some surgeons have selectively used regional cerebral perfusion as an alternative. We aimed to compare the incidence of postoperative electroencephalographic seizure incidence in neonates undergoing surgery with regional cerebral perfusion and deep hypothermic circulatory arrest. MethodsA retrospective analysis was performed in neonates who underwent surgery between 2012 and 2022 with either deep hypothermic circulatory arrest or regional cerebral perfusion with routine postoperative continuous electroencephalography monitoring for 48 hours. Propensity matching was performed to compare postoperative seizure risk between the 2 groups. ResultsAmong 1136 neonates undergoing cardiac surgery with cardiopulmonary bypass, regional cerebral perfusion was performed in 99 (8.7%) and deep hypothermic circulatory arrest in 604 (53%). The median duration of regional cerebral perfusion was 49 minutes (interquartile range, 38-68) and deep hypothermic circulatory arrest was 41 minutes (interquartile range, 31-49). The regional cerebral perfusion group had significantly longer total support, cardiopulmonary bypass, and aortic crossclamp times. Overall seizure incidence was 11% (N = 76) and 13% (N = 35) in the most recent era (2019-2022). The unadjusted seizure incidence was similar in neonates undergoing regional cerebral perfusion (N = 12, 12%) and deep hypothermic circulatory arrest (N = 64, 11%). After propensity matching, the seizure incidence was similar in neonates undergoing regional cerebral perfusion (N = 12, 12%) and deep hypothermic circulatory arrest (N = 37, 12%) (odds ratio, 0.97; 95% CI, 0.55-1.71; P = .92). ConclusionsIn this contemporary single-center experience, the incorporation of regional cerebral perfusion did not result in a change in seizure incidence in comparison with deep hypothermic circulatory arrest. However, unmeasured confounders may have impacted these findings. Further studies are needed to determine the impact, if any, of regional cerebral perfusion on postoperative seizure incidence.

Continuous Electroencephalography (EEG) Protocol Improves Seizure Detection in Children on Extracorporeal Membrane Oxygenation.

Seizures are a complication for pediatric patients requiring extracorporeal membrane oxygenation (ECMO). There are no standardized guidelines regarding continuous electroencephalography (EEG) monitoring to detect seizures in these patients, and the impact of protocolized monitoring has not been evaluated. Here we examined the effects of continuous EEG protocol implementation in our pediatric ECMO population. Retrospective chart reviews were conducted on 57 patients who underwent extracorporeal membrane oxygenation and concurrent continuous EEG out of 165 patients supported on extracorporeal membrane oxygenation. Timing of continuous EEG initiation and seizures detected by continuous EEG was determined for 5 years prior to and 15 months after protocol implementation. Protocol implementation was associated with increased ECMO-supported patients who were concurrently monitored by continuous EEG. Time from ECMO cannulation to continuous EEG initiation was shorter (median 7 hours after versus 16.2 hours before; P < .001). Patients who had ongoing seizures at the start of continuous EEG recording decreased from 64% preprotocol to 0% postprotocol (P < .001), and there was an associated earlier time to break in status epilepticus postprotocol. Seizures were detected past 48 hours after cannulation in 50% of patients in the postprotocol group. Protocol implementation resulted in earlier continuous EEG initiation and more EEGs initiated before seizure onset with evidence of altered seizure dynamics. Although current recommendations suggest that continuous EEG duration of 24-48 hours results in seizure detection for >90% of critically ill adults, longer monitoring may be needed to reliably detect seizures in children supported with ECMO, particularly if monitoring is initiated earlier in the post-cannulation period.

Incidence of Neonatal Seizures in China Based on Electroencephalogram Monitoring in Neonatal Neurocritical Care Units

Neonatal seizures pose a significant challenge in critical care, and continuous video electroencephalography (cEEG) monitoring holds promise for early detection of seizures. However, large-scale data on the incidence of neonatal seizures and monitoring systems in China are lacking. To determine the incidence of neonatal seizures in infants with high risk in China. A large, cross-sectional multicenter study was conducted from January 2017 to December 2018 in the neonatal intensive care units (NICUs) of 7 tertiary medical centers in China. Neonates with high risk were included, and cEEG monitoring was conducted. Data were collected between January 1, 2017, and January 31, 2020. The data were analyzed between January 2021 and January 2022. The incidence of neonatal seizures, categorized by etiology, and seizure burden. A total of 20 310 neonates with high risk were included (10 495 [51.7%] male; mean [SD] postmenstrual age, 37.7 [3.7] weeks), and seizures were observed in 3423 infants (16.9%). The highest proportion of seizures was attributed to acute neonatal encephalopathy (1448 [42.3%]). The incidence of seizures decreased with postmenstrual age and birth weight, with the highest occurrence observed in neonates with postmenstrual age of less than 28 weeks (237 of 879 [27.0%]) or birth weight of less than 1.0 kg (269 of 914 [29.4%]). Preterm infants had a higher proportion of moderate and severe seizure burdens compared with full-term infants (moderate severity: 248 of 1199 [20.7%] vs 454 of 2224 [20.4%]), but no significant differences were observed in etiology. Seizure burden was highest with genetic syndromes (49 of 188 [26.1%]), central nervous system malformations (33 of 127 [26.0%]), and inborn errors of metabolism (27 of 113 [23.9%]). During hospitalization, 7.8% of neonates with seizures died (267 neonates), with 81.3% of these cases having a moderate or severe seizure burden (217 neonates). Mortality was generally higher in preterm vs full-term infants (98 of 1199 [8.2%] vs 169 of 2224 [7.6%]) and increased with the severity of seizure burden (217 of 267 neonates with moderate or severe burden [81.3%]). This cross-sectional study of neonatal seizures underscores the substantial burden seizures pose to high-risk infants with brain injury in China, particularly those who are born prematurely or who have congenital conditions.

AWAreness during REsuscitation - II: A multi-center study of consciousness and awareness in cardiac arrest

IntroductionCognitive activity and awareness during cardiac arrest (CA) are reported but ill understood. This first of a kind study examined consciousness and its underlying electrocortical biomarkers during cardiopulmonary resuscitation (CPR). MethodsIn a prospective 25-site in-hospital study, we incorporated a) independent audiovisual testing of awareness, including explicit and implicit learning using a computer and headphones, with b) continuous real-time electroencephalography(EEG) and cerebral oxygenation(rSO2) monitoring into CPR during in-hospital CA (IHCA). Survivors underwent interviews to examine for recall of awareness and cognitive experiences. A complementary cross-sectional community CA study provided added insights regarding survivors’ experiences. ResultsOf 567 IHCA, 53(9.3%) survived, 28 of these (52.8%) completed interviews, and 11(39.3%) reported CA memories/perceptions suggestive of consciousness. Four categories of experiences emerged: 1) emergence from coma during CPR (CPR-induced consciousness [CPRIC]) 2/28(7.1%), or 2) in the post-resuscitation period 2/28(7.1%), 3) dream-like experiences 3/28(10.7%), 4) transcendent recalled experience of death (RED) 6/28(21.4%). In the cross-sectional arm, 126 community CA survivors’ experiences reinforced these categories and identified another: delusions (misattribution of medical events). Low survival limited the ability to examine for implicit learning. Nobody identified the visual image, 1/28(3.5%) identified the auditory stimulus. Despite marked cerebral ischemia (Mean rSO2 = 43%) normal EEG activity (delta, theta and alpha) consistent with consciousness emerged as long as 35–60 minutes into CPR. ConclusionsConsciousness. awareness and cognitive processes may occur during CA. The emergence of normal EEG may reflect a resumption of a network-level of cognitive activity, and a biomarker of consciousness, lucidity and RED (authentic “near-death” experiences).

Association of Epileptiform Activity With Outcomes in Toxic-Metabolic Encephalopathy.

To quantify EA burden in patients with TME and its association with neurologic outcomes. This is a retrospective study. A cohort of patients with TME and EA (positive) were age, Sequential Organ Failure Assessment Score, Acute Physiology and Chronic Health Evaluation II (APACHE-II) score matched to a cohort of TME patients without EA (control). Univariate analysis compared EA-positive patients against controls. Multivariable logistical regression adjusting for underlying disease etiology was performed to examine the relationship between EA burden and probability of poor neurologic outcome (modified Rankin Score [mRS] 4-6) at discharge. Consecutive admissions to inpatient floors or ICUs that underwent continuous electroencephalography (cEEG) monitoring at a single center between 2012 and 2019. Inclusion criteria were 1) patients with TME diagnosis, 2) age greater than 18 years, and 3) greater than or equal to 16 hours of cEEG. Patients with acute brain injury and cardiac arrest were excluded. Poor neurologic outcome defined by mRS (mRS 4-6). One hundred sixteen patients were included, 58 with EA and 58 controls without EA, where matching was performed on age and APACHE-II score. The median age was 66 (Q1-Q3, 57-75) and median APACHE II score was 18 (Q1-Q3, 13-22). Overall cohort discharge mortality was 22% and 70% had a poor neurologic outcome. Peak EA burden was defined as the 12-hour window of recording with the highest prevalence of EAs. In multivariable analysis adjusted for Charlson Comorbidity Index and primary diagnosis, presence of EAs was associated with poor outcome (odds ratio 3.89; CI [1.05-14.2], p = 0.041). Increase in peak EA burden from 0% to 100% increased probability of poor discharge neurologic outcome by 30%. Increasing burden of EA is associated with worse discharge outcomes in patients with TME. Future studies are needed to determine whether short-term treatment with anti-seizure medications while medically treating the underlying metabolic derangement improves outcomes.

Continuous electroencephalography in the intensive care unit: A critical review and position statement from an Australian and New Zealand perspective

ObjectivesThis article aims to critically review the literature on continuous electroencephalography (cEEG) monitoring in the intensive care unit (ICU) from an Australian and New Zealand perspective and provide recommendations for clinicians. Design and review methodsA taskforce of adult and paediatric neurologists, selected by the Epilepsy Society of Australia, reviewed the literature on cEEG for seizure detection in critically ill neonates, children, and adults in the ICU. The literature on routine EEG and cEEG for other indications was not reviewed. Following an evaluation of the evidence and discussion of controversial issues, consensus was reached, and a document that highlighted important clinical, practical, and economic considerations regarding cEEG in Australia and New Zealand was drafted. ResultsThis review represents a summary of the literature and consensus opinion regarding the use of cEEG in the ICU for detection of seizures, highlighting gaps in evidence, practical problems with implementation, funding shortfalls, and areas for future research. ConclusionWhile cEEG detects electrographic seizures in a significant proportion of at-risk neonates, children, and adults in the ICU, conferring poorer neurological outcomes and guiding treatment in many settings, the health economic benefits of treating such seizures remain to be proven. Presently, cEEG in Australian and New Zealand ICUs is a largely unfunded clinical resource that is subsequently reserved for the highest-impact patient groups. Wider adoption of cEEG requires further research into impact on functional and health economic outcomes, education and training of the neurology and ICU teams involved, and securement of the necessary resources and funding to support the service.

It Is Going to Be a Long Clinic Day

It Is Going to Be a Long Clinic Day Salvador Cruz-Flores It was a routine neurology clinic day. I entered the room where one of the residents was seeing a patient that we will call Patty, a 32-year-old long-standing epilepsy patient. Patty was sitting in the chair with her husband by her side. She started screaming at me, complaining that she was tired of feeling sick and unable to do anything. She had been in and out of emergency rooms with a variety of complaints, from passing out to dizziness with nausea and vomiting. She was visibly angry and started cursing me with direct expletives and blaming me for all her ailments. Her husband was quiet and, at times, would cover his face as if he was embarrassed. I felt an initial burst of anger. I felt my face getting red. I made a great effort to stay quiet, leaned on the exam table facing them, lowered my voice, and braced to take the barrage of insults that were coming my way. I had to make a strong conscious effort to control my emotions and let her vent. I felt that if I responded in kind, I would inflame the situation. Moreover, a resident and a student working with me that day were also present in the room, and I felt it was my duty to behave professionally, so I sat and tried to do active listening with the idea of offering solutions to her complaints. I am not sure how long the event lasted, but it seemed like an eternity. As she slowed down, I apologized for making her feel not cared for, repeated some of her complaints, and tried to offer solutions to them, but she would not have it and did not accept anything I said. She wanted to get her prescriptions and leave the clinic. I offered to have one of my colleagues do the follow-up as she really did not want to see me anymore. Patty is one of those patients that when you see the name in the schedule, you cringe and tell yourself, it is going to be a long clinic day. She could be in the group of patients who are considered very difficult. Before me, she had been seen by several other neurologists. They likely also preferred not to see her on the schedule because she is one of the 20–30% of patients that have a type of functional psychogenic disorder that becomes more complicated because of the coexistence of epileptic seizures along with non-epileptic psychogenic events. The latter is a more problematic event because it does not respond to pharmacological treatment and causes a lot of disability. The best way to establish whether an event is a true epileptic event or a non-epileptic psychogenic event is to do continuous electroencephalographic monitoring to capture as many events as possible on video. I tried different combinations of medications to no avail and with significant side effects. I tried to set her up for electroencephalogram home monitoring to tease the epileptic and psychogenic events apart. In truth, her social circumstances, insurance coverage, and economic situation made it impossible to do so. Every time she came to the clinic, she had a multitude of complaints, and she would ask for a medication to treat the problem. Any mention of the potential psychogenic nature of her problems would result in a defensive attitude "so you are saying I am crazy." We discussed multiple times the need to be careful with the medications and the potential bad side effects. I wanted to help her, but with every visit, there seemed to be a barrier, and the visit would end on bad terms. At least, that is how I felt. I was left every time, with a feeling of frustration. I believe that she left the clinic feeling the same. That day, I left the clinic upset and depressed. I tried to convince myself I had done all I could to help her. I just could not understand why this was the result. Several years have passed since I have seen Patty in the clinic. She certainly has not...

Extracorporeal Membrane Oxygenation for Neonates With Congenital Diaphragmatic Hernia: Prevalence of Seizures and Outcomes.

We aimed to determine the prevalence of electrographic seizures and associated odds of adverse outcomes of electrographic seizures in neonates with congenital diaphragmatic hernia (CDH) receiving extracorporeal membrane oxygenation (ECMO). Retrospective, descriptive case series. Neonatal ICU (NICU) in a quaternary care institution. All neonates with CDH receiving ECMO undergoing continuous electroencephalographic monitoring (CEEG) and follow-up between January 2012 and December 2019. None. All eligible neonates with CDH receiving ECMO underwent CEEG (n = 75). Electrographic seizures occurred in 14 of 75 (19%): they were exclusively electrographic-only in nine of 14, both electrographic-only and electroclinical in three of 14, and electroclinical only in two of 14. Two neonates developed status epilepticus. We identified an association between presence of seizures, rather than not, and longer duration of initial session of CEEG monitoring (55.7 hr [48.2-87.3 hr] vs 48.0 hr [43.0-48.3 hr]; p = 0.001). We also found an association between presence of seizures, rather than not, and greater odds of use of a second CEEG monitoring (12/14 vs 21/61; odds ratio [OR], 11.43 [95% CI, 2.34-55.90; p = 0.0026). Most neonates with seizures (10/14), experienced their onset of seizures more than 96 hours after the start of ECMO. Overall, the presence of electrographic seizures, compared with not, was associated with lower odds of survival to NICU discharge (4/14 vs 49/61; OR 0.10 [95% CI 0.03 to 0.37], p = 0.0006). Also, the presence of seizures-rather than not-was associated with greater odds of a composite of death and all abnormal outcomes on follow-up (13/14 vs 26/61; OR, 17.5; 95% CI, 2.15-142.39; p = 0.0074). Nearly one in five neonates with CDH receiving ECMO developed seizures during the ECMO course. Seizures were predominantly electrographic-only and when present were associated with great odds of adverse outcomes. The current study provides evidence to support standardized CEEG in this population.

Clinical Features and Management of Status Epilepticus in the Pediatric Intensive Care Unit.

Status epilepticus (SE) is associated with significant morbidity and mortality in children. SE in the pediatric intensive care unit (PICU) are not well characterized. The aim of this study is to retrospectively investigate the clinical features and treatment of seizures in children admitted to the PICU of our hospital. We retrospectively examined the clinical characteristics of patients aged between 1 month and 18 years who were admitted to our hospital with SE or who were diagnosed with SE after hospitalization and were followed up with continuous electroencephalographic monitoring between January 2015 and December 2019. A total of 88 patients with SE, 50 (56.8%) boys and 38 (43.2%) girls, were included. The median age was 24 months (interquartile range, 12-80 months). When we evaluate the continuous electroencephalographic monitoring data, 27 (30.7%) were lateralized, 20 (22.7%) were multifocal, 30 (34.1%) were generalized, and 11 (12.5%) were bilateral independent epileptic activity. Seventy nine patients (89.8%) were evaluated as convulsive status epilepticus (CSE) and 9 (10.2%) as nonconvulsive status epilepticus (NCSE). Pediatric Risk of Mortality (PRISM III) score and mortality of patients with NCSE were higher ( P = 0.004 and P = 0.046, respectively). Thirteen eight patients (43.1%) were diagnosed as SE, 38 patients (43.1%) as refractory SE, and 12 patients (13.6%) as super-refractory SE. The overall mortality rate was 10.2%. Status epilepticus is a neurological emergency that causes mortality and morbidity. Electroencephalographic monitoring is important for the recognition of seizures and rapid intervention. No superiority of second-line treatments or combined treatments was demonstrated in patients with SE.

Evaluation of Nonconvulsive Status Epilepticus and Nonconvulsive Seizures in a Pediatric Intensive Care Unit.

We aimed to identify nonconvulsive seizures (NCS) and nonconvulsive status epilepticus (NCSE) in a pediatric intensive care unit (PICU). A prospective cohort study on 35 patients who underwent continuous electroencephalographic monitoring in the PICU was done. The patients were evaluated to collect data of their demographics, clinical diagnoses, clinical seizures by electroencephalography, and neuroimaging findings. One case with NCSE and 4 cases with NCS were diagnosed among the 35 patients. The etiology of the patient with NCSE showed antiepileptic drug (AED) withdrawal. The etiology of the patients with NCS included electrical injury, head trauma, subarachnoid hemorrhage, and pneumonia. The findings suggest that younger age, epilepsy, acute structural brain abnormalities, abrupt cessation of AED, and clinically overt seizures before NCSE/NCS are associated with significant risk for NCS/NCSE. In addition, the electrical injury may also be considered as a risk factor for electrographic seizure though such a case has not yet been reported.

Indications for continuous electroencephalographic (cEEG) monitoring: What do they tell us?

ObjectiveWhile studies have explored clinical and EEG predictors of seizures on continuous EEG (cEEG), the role of cEEG indications as predictors of seizures has not been studied. Our study aims to fill this knowledge gap. MethodsWe used the prospective cEEG database at Cleveland Clinic for the 2016 calendar year. Patients ≥ 18 years who underwent cEEG for the indication of altered mental status (AMS) and seizure-like events (SLE: motor or patient-reported events) were included. Baseline characteristics and EEG findings were compared between the two groups. Multivariable regression was used to compare the two groups and identify seizure detection risk factors. ResultsOf 2227 patients (mean age 59.4 years) who met the inclusion criteria, 882 (50% females) underwent cEEG for AMS and 1345(51% females) for SLE. SLE patients were younger(OR: 0.988, CI: 0.98–0.99, p < 0.001), had longer monitoring(OR:1.04, CI:1.00–1.07, p = 0.033), were more likely to have epilepsy-related-breakthrough seizures(OR:25.9, CI:0.5.89–115, p < 0.001), psychogenic non-epileptic spells (OR:6.85, CI:1.60–29.3, p = 0.008), were more awake (p < 0.001) and more likely to be on anti-seizure medications(OR:1.60, CI:1.29–1.98, p < 0.001). On multivariable analysis, SLE was an independent predictor of seizure detection (OR: 2.60, CI: 1.77–3.88, p < 0.001). SignificanceOur findings highlight the differences in patients undergoing cEEG for AMS vs. SLE. SLE as a cEEG indication represents an independent predictor of seizures on cEEG and, therefore, deserves special attention. Future multicenter studies are needed to validate our findings.

Cerebral cortical activity after withdrawal of life-sustaining measures in critically ill patients

Establishing when cerebral cortical activity stops relative to circulatory arrest during the dying process will enhance trust in donation after circulatory determination of death. We used continuous electroencephalography and arterial blood pressure monitoring prior to withdrawal of life sustaining measures and for 30 min following circulatory arrest to explore the temporal relationship between cessation of cerebral cortical activity and circulatory arrest. Qualitative and quantitative EEG analyses were completed. Among 140 screened patients, 52 were eligible, 15 were enrolled, 11 completed the full study, and 8 (3 female, median age 68 years) were included in the analysis. Across participants, EEG activity stopped at a median of 78 (Q1=-387, Q3=111) seconds before circulatory arrest. Following withdrawal of life sustaining measures there was a progressive reduction in electroencephalographic amplitude (p=.002), spectral power (p=.008), and coherence (p=.003). Prospective recording of cerebral cortical activity in imminently dying patients is feasible. Our results from this small cohort suggest that cerebral cortical activity does not persist after circulatory arrest. Confirmation of these findings in a larger multicenter study are needed to help promote stakeholder trust in donation after circulatory determination of death.

Changes in the treatment of pediatric acute encephalopathy in Japan between 2015 and 2021: A national questionnaire-based survey

BackgroundAlthough acute encephalopathy (AE) is the most serious disorder associated with a viral infection in childhood and often causes death or neurological sequelae, standard treatments have not been established. In 2016, the Japanese Society of Child Neurology published the “Guidelines for the Diagnosis and Treatment of Acute Encephalopathy in Childhood 2016” (AE GL 2016). We conducted a questionnaire survey to evaluate the status of the treatment of pediatric AE in 2021 and the changes in treatment before and after the publication of the AE GL 2016. MethodsIn October 2021, questionnaires were mailed via the web to members of two mailing lists who were involved in the practice of pediatric neurological disorders. ResultsMost Japanese physicians (98 %) engaged in the treatment of pediatric AE used the AE GL 2016 as a clinical reference. From 2015 to 2021, the number of institutions that implemented targeted temperature management (TTM), vitamin administration, and continuous electroencephalographic monitoring increased significantly. Regarding the targeted temperature for TTM, the proportion of patients who were treated with normothermia (36.0–37.0 °C) increased from 2015 (55 %) to 2021 (79 %). The use of corticosteroids in patients with AE caused by a cytokine storm, which is recommended in the AE GL 2016, had already been implemented in most institutions by 2015. ConclusionThe AE GL 2016 could be used to disseminate the knowledge accumulated to date. Evidence of the efficacy and proper indication criteria for the treatment of AE is insufficient and must be further accumulated.

This Month in Anesthesiology

This Month in Anesthesiology

WE-190. Outcome prediction in patients with severe traumatic brain injury using continuous electroencephalography monitoring

WE-190. Outcome prediction in patients with severe traumatic brain injury using continuous electroencephalography monitoring