Influenza-Associated Encephalopathy and Acute Necrotizing Encephalopathy in Children: A Retrospective Single-Center Study

Elevated D-dimer on admission may predict poor prognosis in childhood influenza associated encephalopathy

To determine the risk factors for poor prognosis of influenza-associated encephalopathy (IAE), 56 eligible children with IAE who were treated in the pediatric intensive care unit of Wuhan Children's Hospital from January 2022 to December 2023 were selected for retrospective analysis and grouped according to poor prognosis or not, and independent risk factors for poor prognosis were found by regression analysis. Results showed 26 children (26/30, 46.4%) had a poor prognosis. In the univariate analysis, the poor prognosis group compared with the clinically cured group showed a significant increase in the number of days of hospitalization (3.0 vs. 9.5 days, P < 0.001), high-sensitivity C-reactive protein (6.80 vs. 1.88 mg/L, P = 0.003), interleukin-6 (20.26 vs. 8.24 pg/mL, P = 0.001), interleukin-10 (11.75 vs. 4.72 pg/mL, P = 0.003), alanine aminotransferase (104.0 vs. 20.0 U/L, P = 0.011), aspartate azelotransferase (186.5 vs. 37.0 U/L, P = 0.003), serum albumin (37.99 vs. 40.76 g/L, P = 0.042), prothrombin time (13.2 vs. 11.4 s, P = 0.017), D-dimer (4.34 vs. 0.44 mg/L FEU, P < 0.001), peripheral blood CD19 B-cell count (35.11 vs. 32.75 cells/µL, P = 0.018), and cerebrospinal fluid chloride (126.82 vs. 125.50 mmol/L, P = 0.027) were statistically different in the above 11 indicators. After binary logistic regression analysis, it was concluded that D-dimer was an independent risk factor for poor prognosis (odds ratio = 1.440, 95% confidence interval 1.052-1.972, P = 0.023), and the area under the curve (95% confidence interval) was 0.802 (0.680-0.924), P < 0.001. When D-dimer was ≥ 1.18 mg/L FEU, the occurrence of poor prognosis was predicted with sensitivity and specificity of 65.4% and 96.7%, respectively. In conclusion, IAE has a high incidence of poor prognosis, in which D-dimer is a possible risk factor with discriminatory value in assessing the occurrence of poor prognosis. However, due to the limitations of retrospective single-center small sample size data, more confirmation from multicenter large sample size studies is needed in the future.

Predictive value of the serum procalcitonin level for fulminant virus-associated encephalopathy

BACKGROUND

Fulminant virus-associated encephalopathy (VAE) is a rare complication of viral infection that presents as acute brain dysfunction and requires respiratory support and/or vasoactive agents. However, the mechanism of VAE is undetermined. The mortality rate is high since there is no specific treatment for fulminant VAE. The aim of this study was to identify risk factors for children with fulminant VAE on the basis of clinical data since timely recognition and treatment might be needed to improve the poor prognosis.

METHODS

This retrospective study included children with fulminant VAE who were diagnosed between June 2018 and October 2023 in the PICU of Guangdong Women and Children Hospital. Clinical data were analyzed, and receiver operating characteristic (ROC) curve analysis was performed to determine the prognostic value of the selected variables.

RESULTS

Twenty-three children with fulminant VAE were included and divided into a survival group (n = 16) and a nonsurvival group (n = 7). The mortality rate of patients with fulminant VAE was 30.8%. Compared with the survival group, the nonsurvival group had higher incidences of shock 48 h after onset, a higher acute necrotizing encephalopathy severity score (ANE-SS), higher procalcitonin (PCT) levels, and lower platelet counts (p < 0.05). The serum PCT level was significantly higher in the children with shock than in those without shock (p = 0.015). The serum PCT concentration was positively correlated with the ANE-SS (correlation coefficient 0.544, p < 0.039). Combined immunotherapies might help to decrease PCT levels in some children. Low PCT levels might be related to a good outcome. The area under the curve (AUC) for PCT used to predict death in patients with fulminant VAEs was 0.821 (95% CI 0.626-1.00). The sensitivity and specificity of PCT > 101.58 ng/ml for predicting death in patients with fulminant VAE were 57.1% and 100.0%, respectively.

CONCLUSIONS

Patients with fulminant VAE deteriorate rapidly and are at high risk of death if they develop shock within 48 h after onset, exhibit extremely elevated serum PCT levels, or have decreased platelet counts. The serum PCT level might predict the death outcome of patients with fulminant VAE.

Severe Neurological Complications With Influenza in Vietnamese Children

BACKGROUND

Influenza is a common contagious respiratory virus that primarily causes respiratory tract infections. Neurological complications associated with influenza have also been reported, mainly in pediatric populations, and may be fatal.

METHODS

A descriptive study evaluated pediatric patients who were diagnosed with severe influenza-associated neurological complications at the Tropical Pediatrics Center-Vietnam National Children's Hospital from October 2022 to February 2024.

RESULTS

In this study involving 20 patients, 80% of children were under 5 years old; 70% of patients had a history of good health. All patients had not received an influenza vaccination within 12 months. The median time from onset to neurological symptoms was 1 day. The most common neurological complication was encephalitis (16/20 patients) with symptoms included altered consciousness and seizures. Most patients had elevated levels of ALT (60%), AST (90%), LDH (94%), and ferritin (69%) in serum. The imaging of brain damage on MRI and CT scans varied in patterns and locations. There was no difference in the timing of methylprednisolone treatment within and after 48 h. The mortality rate was 20%, with 45% of patients experiencing severe sequelae.

CONCLUSIONS

IANCs are severe with damage to both white matter and central gray matter and can occur in healthy children, emphasizing the importance of vaccination to reduce the risk.

Clinical characteristics and prognosis of paediatric respiratory syncytial virus-related encephalopathy

BACKGROUND

To understand the clinical characteristics and prognosis of respiratory syncytial virus (RSV)-related encephalopathy in children.

METHODS

A retrospective analysis of the data of children who were diagnosed with RSV-related encephalopathy and admitted to the paediatric intensive care unit (PICU) of Beijing Children's Hospital between November 2016 and November 2023 was performed.

RESULTS

Four hundred and sixty-four children with RSV infection were treated in the PICU, and eight of these patients (1.7%) were diagnosed with RSV-related encephalopathy. The mean age of the patients was 24.89 (5.92 ∼ 36.86) months. Two patients had underlying diseases. The time from the onset of illness to impaired consciousness was 3 (1.88-3.75) days. Five patients had convulsions, and three patients had an epileptic status. The serum procalcitonin (PCT) level was 1.63 (0.24, 39.85) ng/ml for the eight patients, and the cerebrospinal fluid (CSF) protein level was 232 (163 ∼ 848) g/L. Among the 8 patients, four patients underwent electroencephalogram (EEG) monitoring or examination. One patient showed continuous low-voltage, nonresponsive activity, and another patient displayed persistent slow waves, the remaining two patients had negative results. One patient had a combination of acute necrotizing encephalopathy (ANE) and acute encephalopathy with biphasic seizures and late reduced diffusion (AESD). Additionally, one patient had ANE, and another had acute brain swelling (ABS). One patient died in the hospital, and the other seven patients were discharged with improvement. Routine follow-up was conducted for 4.58(0.5 ∼ 6.50) years, and all patients fully recovered.

CONCLUSIONS

RSV-related encephalopathy could have varying clinical manifestations, and some types, such as ANE and ABS, are dangerous and can lead to death.

Risk factors for mortality in fulminant acute necrotizing encephalopathy following influenza A in an adolescent boy

Acknowledging the risk factors of mortality and morbidity of each disease is effective for its final outcome. Recognizing these cases can have the value of preventing the occurrence of unfortunate events, such as not recommending the use diclofenac in an influenza epidemic.

Neurological complications associated with influenza in hospitalized children

BACKGROUND

Influenza is a known respiratory and potential neurotropic virus. This study aimed to determine the prevalence and outcomes of influenza-related neurological complications among hospitalized children.

METHODS

All medical records of hospitalized children aged <18 years old diagnosed with influenza at a tertiary care hospital in Bangkok were retrospectively reviewed. Influenza infection was confirmed by rapid antigen or reverse transcription polymerase chain reaction tests. Neurological characteristics and clinical outcomes were analyzed using the Pediatric Cerebral Performance Category Scale.

RESULTS

From 2013 to 2018, 397 hospitalized children with a median age of 3.7 years (interquartile range [IQR]: 1.6-6.9) were included. The prevalence of neurological complications, including seizure or acute encephalopathy, was 16.9% (95% confidence interval [CI]: 13.3-20.9). Influenza A and B were identified in 73.1% and 26.9% of the patients, respectively. Among 39 (58.2%) acute symptomatic seizure cases, 25 (37.3%) children had simple febrile seizures, 7 (10.4%) had repetitive seizures, and 7 (10.4%) had provoked seizures with pre-existing epilepsy. For 28 (41.8%) encephalopathy cases, the clinical courses were benign in 20 (29.9%) cases and severe in 8 (11.9%) cases. Ten (14.9%) children needed intensive care monitoring, and 62 (93.5%) fully recovered to their baselines at hospital discharge. Predisposing factors to the neurological complications included a history of febrile seizure (adjusted odds ratio [aOR]: 20.3; 95% CI: 6.6-63.0), pre-existing epilepsy (aOR: 3.6; 95% CI: 1.3-10.2), and a history of other neurological disorders (aOR: 3.5; 95% CI: 1.2-10.2).

CONCLUSIONS

One fifth of hospitalized children with influenza had neurological complications with a favorable outcome. Children with pre-existing neurological conditions were at higher risk for developing neurological complications.

Positive Impact of Inpatient Respiratory Rehabilitation in a Rare Case of Acute Necrotizing Encephalopathy

Acute necrotizing encephalopathy, also known as acute necrotizing encephalopathy of childhood (ANEC) is a rare disorder characterized by respiratory or gastrointestinal infections, high fever, and rapid changes in consciousness and seizures. ANEC is a rare form of encephalopathy characterized by multiple bilateral brain lesions, primarily involving the thalami and putamina internal and external capsules, cerebellar white matter, and the brainstem segmentum. Here we present, a rare case of acute necrotizing encephalopathy in a pediatric patient, a 13-year-old boy, who was admitted with acute onset of fever. The fever was intermittent and high grade along with chills, rigor, and respiratory distress five days back. The chest x-ray showed heterogeneous opacities in bilateral lung fields. Thalami, brainstem, cerebellum, and white matter have all been shown to have a symmetric lesion in this disease on magnetic resonance imaging (MRI). Ventilation, immunoglobulin, and other supporting measures, as well as respiratory rehabilitation, were used to treat him. In pediatric intensive care units (PICU), physiotherapy is considered an important aspect of patient care. Respiratory rehabilitation included patients and their family member's counseling, airway clearance techniques, energy conservation methods, and adaptation to complex positions with the maintenance of oxygen saturation (SpO₂). We conclude Respiratory rehabilitation with efficient family counseling is effective in the overall improvement of the patient’s condition with acute respiratory failure in acute necrotizing encephalopathy.

A sudden death due to acute necrotizing encephalopathy associated with influenza A virus infection: An autopsy case report

Influenza occasionally causes central nervous system disorders. Acute necrotizing encephalopathy (ANE) is one of the most severe influenza-associated complications, predominantly affecting infants and young children under 5 years of age. We present this case as it involves a very rare complication of influenza infection that is known to have a high rate of mortality. A 5-year-old girl presented with a high fever and convulsions. Her condition deteriorated rapidly, and she died within 24 h. Autopsy revealed extensive brain edema, multifocal perivascular hemorrhage, and necrosis of neurons without inflammatory cell infiltration in the pons and bilateral thalamus. Tests for influenza virus A and antibodies to it were positive. The girl's death was attributed to ANE associated with influenza A infection based on the clinical presentation, the postmortem neuropathology, and identification of the virus. The goal of this report is to draw attention to the potentially serious complications of influenza A infection. We hope that the lethal outcome of this disease will be fully recognized by medical personnel.

Post-Infectious Autoimmunity in the Central (CNS) and Peripheral (PNS) Nervous Systems: An African Perspective

The direct impact and sequelae of infections in children and adults result in significant morbidity and mortality especially when they involve the central (CNS) or peripheral nervous system (PNS). The historical understanding of the pathophysiology has been mostly focused on the direct impact of the various pathogens through neural tissue invasion. However, with the better understanding of neuroimmunology, there is a rapidly growing realization of the contribution of the innate and adaptive host immune responses in the pathogenesis of many CNS and PNS diseases. The balance between the protective and pathologic sequelae of immunity is fragile and can easily be tipped towards harm for the host. The matter of immune privilege and surveillance of the CNS/PNS compartments and the role of the blood-brain barrier (BBB) and blood nerve barrier (BNB) makes this even more complex. Our understanding of the pathogenesis of many post-infectious manifestations of various microbial agents remains elusive, especially in the diverse African setting. Our exploration and better understanding of the neuroimmunology of some of the infectious diseases that we encounter in the continent will go a long way into helping us to improve their management and therefore lessen the burden. Africa is diverse and uniquely poised because of the mix of the classic, well described, autoimmune disease entities and the specifically "tropical" conditions. This review explores the current understanding of some of the para- and post-infectious autoimmune manifestations of CNS and PNS diseases in the African context. We highlight the clinical presentations, diagnosis and treatment of these neurological disorders and underscore the knowledge gaps and perspectives for future research using disease models of conditions that we see in the continent, some of which are not uniquely African and, where relevant, include discussion of the proposed mechanisms underlying pathogen-induced autoimmunity. This review covers the following conditions as models and highlight those in which a relationship with COVID-19 infection has been reported: a) Acute Necrotizing Encephalopathy; b) Measles-associated encephalopathies; c) Human Immunodeficiency Virus (HIV) neuroimmune disorders, and particularly the difficulties associated with classical post-infectious autoimmune disorders such as the Guillain-Barré syndrome in the context of HIV and other infections. Finally, we describe NMDA-R encephalitis, which can be post-HSV encephalitis, summarise other antibody-mediated CNS diseases and describe myasthenia gravis as the classic antibody-mediated disease but with special features in Africa.

Clinical evaluation of acute necrotizing encephalopathy in children

OBJECTIVE

Acute necrotizing encephalopathy (ANE) is a rare but severe encephalopathy and is associated with a high morbidity and mortality. We aimed to analyze and compare the clinical features and predictive indicators of pediatric ANE.

MATERIALS AND METHODS

This retrospective study included children with ANE diagnosed at Guangzhou Women and Children's Medical Center between November 2018 and January 2020. Pediatric patients' information, including clinical characteristics, laboratory tests, neuroelectrophysiology and brain magnetic resonance imaging (MRI) findings, MRI score, brainstem auditory evoked potential (BAEP) grades, ANE severity scores (ANE-SS), and modified Rankin scale (mRS), were collected.

RESULTS

Twelve ANE patients were included. Among them, one patient (8.3%) died from brainstem dysfunction, one (8.3%) recovered and 10 (83.3%) experienced neurological sequelae. All patients had an initial viral infection and neurological symptoms such as acute disturbance of consciousness (ADOC) or seizure, and the interval from onset of the disease to neurological manifestations was 3 (1.25-3) days. MRI score-I ranged from 1 to 3 (1.8 ± 0.7), MRI score-II ranged from 1 to 4 (2.5 ± 1.1). ANE-SS varied from 1 to 6 (3.9 ± 1.3). The scores of mRS were from 0 to 6 (2.9 ± 1.7). Higher MRI score were associated with worse outcomes, while the BAEP grade and ANE-SS score were not significantly associated with mRS.

CONCLUSION

ANE is a severe encephalopathy syndrome with rapid progression, resulting in serious neurological sequelae. Compared with BAEP grade and ANE-SS, brain MRI shows more comprehensive advantages in predicting the prognosis of ANE patients. More in-depth research and better indicators are still needed to support the evaluation and treatment of ANE.

Plasma exchange therapy for acute necrotizing encephalopathy of childhood

IMPORTANCE

Acute necrotizing encephalopathy (ANE) is a rare disease with high mortality. Plasma exchange (PLEX) has recently been reported to treat ANE of childhood (ANEC), but its efficacy is uncertain.

OBJECTIVE

This study aimed to investigate the effectiveness of PLEX on ANEC.

METHODS

A retrospective study was conducted in four pediatric intensive care units from December 2014 to December 2020. All patients who were diagnosed with ANEC were included; however, these patients were excluded if their length of stay was less than 24 h. Participants were classified into PLEX and non-PLEX groups.

RESULTS

Twenty-nine patients with ANEC were identified, 10 in the PLEX group and 19 in the non-PLEX group. In the PLEX group, C-reactive protein, procalcitonin, alanine aminotransferase, and aspartate aminotransaminase levels were significantly lower after 3 days of treatment than before treatment (13.1 vs. 8.0, P = 0.043; 9.8 vs. 1.5, P = 0.028; 133.4 vs. 31.9, P = 0.028; 282.4 vs. 50.5, P = 0.046, respectively). Nine patients (31.0%, 9/29) died at discharge, and a significantly difference was found between the PLEX group and non-PLEX group [0 vs. 47.4% (9/19), P = 0.011]. The median follow-up period was 27 months, and three patients were lost to follow-up. Thirteen patients (50.0%, 13/26) died at the last follow-up, comprising three (33.3%, 3/9) in the PLEX group and ten (58.8%, 10/17) in the non-PLEX group, but there was no significant difference between the two groups (P = 0.411). Three patients (10.3%, 3/29) fully recovered.

INTERPRETATION

PLEX may reduce serum C-reactive protein and procalcitonin levels and improve liver function in the short term. PLEX may improve the prognosis of ANEC, and further studies are needed.

[A clinical study of influenza A virus infection with neurological symptoms in children]

OBJECTIVE

To study the clinical features of children with influenza A virus infection and neurological symptoms.

METHODS

A retrospective analysis was performed for the clinical data of children with laboratory-confirmed influenza A and neurological symptoms who were treated in Xi'an Children's Hospital Affiliated to Xi'an Jiaotong University from January to December, 2019.

RESULTS

A total of 895 children were diagnosed with influenza A, among whom 291 had neurological symptoms. Boys had a significantly higher incidence rate of influenza A than girls (P < 0.05), and the children aged 1-3 years had a significantly higher incidence rate than the other age groups (P < 0.05). Common neurological symptoms included seizures (97.3%), vomiting (24.1%), and headache (7.2%). Febrile seizures were the most common type of seizures, accounting for 88%. There was no significant difference in the time from disease onset to seizures and frequency seizures between the children with a history of febrile seizures and those without such history (P > 0.05). Of all the children, 3 were diagnosed with acute necrotizing encephalopathy (ANE), all of whom were girls and suffered seizures; the time from the first seizures to the occurrence of disturbance of consciousness was 0-7 hours, and 2 girls died within 2 days after disease onset. All children, except 2 who died of ANE and 1 with neurological sequelae, were cured.

CONCLUSIONS

There is a high incidence rate of neurological symptoms in children with influenza A, and seizures are the most common symptom. Most of the patients with neurological symptoms tend to have a good prognosis, but those with ANE may have a poor prognosis.

[A clinical study of influenza A virus infection with neurological symptoms in children]

OBJECTIVE

To study the clinical features of children with influenza A virus infection and neurological symptoms.

METHODS

A retrospective analysis was performed for the clinical data of children with laboratory-confirmed influenza A and neurological symptoms who were treated in Xi'an Children's Hospital Affiliated to Xi'an Jiaotong University from January to December, 2019.

RESULTS

A total of 895 children were diagnosed with influenza A, among whom 291 had neurological symptoms. Boys had a significantly higher incidence rate of influenza A than girls (P < 0.05), and the children aged 1-3 years had a significantly higher incidence rate than the other age groups (P < 0.05). Common neurological symptoms included seizures (97.3%), vomiting (24.1%), and headache (7.2%). Febrile seizures were the most common type of seizures, accounting for 88%. There was no significant difference in the time from disease onset to seizures and frequency seizures between the children with a history of febrile seizures and those without such history (P > 0.05). Of all the children, 3 were diagnosed with acute necrotizing encephalopathy (ANE), all of whom were girls and suffered seizures; the time from the first seizures to the occurrence of disturbance of consciousness was 0-7 hours, and 2 girls died within 2 days after disease onset. All children, except 2 who died of ANE and 1 with neurological sequelae, were cured.

CONCLUSIONS

There is a high incidence rate of neurological symptoms in children with influenza A, and seizures are the most common symptom. Most of the patients with neurological symptoms tend to have a good prognosis, but those with ANE may have a poor prognosis.