Functional Neurologic Symptom Disorder in Children: Clinical Features, Diagnostic Investigations, and Outcomes at a Tertiary Care Children's Hospital

Biomarkers and Rehabilitation for Functional Neurological Disorder

Functional neurological disorder, or FND, is widely misunderstood, particularly when considering recent research indicating that the illness has numerous biological markers in addition to its psychiatric disorder associations. Nonetheless, the long-held view that FND is a mental illness without a biological basis, or even a contrived (malingered) illness, remains pervasive both in current medical care and general society. This is because FND involves intermittent disability that rapidly and involuntarily alternates with improved neurological control. This has in turn caused shaming, perceived low self-efficacy, and social isolation for the patients. Until now, biomarker reviews for FND tended not to examine the features that are shared with canonical neurological disorders. This review, in contrast, examines current research on FND biomarkers, and in particular their overlap with canonical neurological disorders, along with the encouraging outcomes for numerous physical rehabilitation trials for FND. These findings support the perspective endorsed here that FND is unquestionably a neurological disorder that is also associated with many biological markers that lie outside of the central nervous system. These results suggest that FND entails multiple biological abnormalities that are widely distributed in the body. General healthcare providers would benefit their care for their patients through their improved understanding of the illness and recourses for support and treatment that are provided in this review.

Syncope and Unresponsiveness in an Adolescent With Comorbid Cardiac Disease: An Illustrative Case Report and Literature Review of Functional Neurologic Symptom Disorder

BACKGROUND

This case report with an associated literature review explores the challenges, opportunities, and current evidence in creating a thoughtful diagnostic and management plan for an adolescent with functional neurologic symptom disorder and comorbid cardiac disease.

METHODS

We performed a literature review utilizing PubMed to identify the current evidence base related to pediatric functional neurologic symptom disorder in the setting of comorbid cardiac disease. Ultimately, 25 manuscripts were identified for inclusion in this study.

RESULTS

We reported the recent epidemiology, screening, diagnostic, and treatment measures utilized in pediatric syncope with a focus on differentiating psychogenic causes from serious cardiac and benign etiologies. We further described how psychiatric and psychological factors influence assessment, management, and outcomes.

CONCLUSIONS

This study provides current, evidence-based suggestions for the assessment, diagnosis, and management of pediatric syncope, with an emphasis on recognizing psychogenic causes of syncope. It includes a description of a novel case of functional neurologic symptom disorder in a pediatric patient with structural cardiac disease. The study highlights how the absence of standardized guidelines, heterogeneity in care delivery, and lack of concurrent mental health management led to worse outcomes.

Pediatric Functional Neurologic Disorders

Functional neurologic disorders are common in the pediatric population. Recently, there has been a renewed focus on functional neurologic disorders, leading to improvements in diagnosis and management. This review focuses on updates in clinical presentation, diagnosis, pathophysiology (including neuroimaging), and treatment of functional neurologic disorders in the pediatric population.

Pediatric Functional Neurological Disorder: Demographic and Clinical Factors Impacting Care

This is a multicenter retrospective EMR-based chart review of 88 patients aged 3-21 years admitted for evaluation of functional neurologic disorder (FND). We sought to establish characteristics associated with FND, calculate incidence of abnormal neurodiagnostic findings, and determine features associated with variability in workup and treatment. FND patients were 65% female, 40% White, 33% Hispanic, and 88% primarily English speaking with median 13.9 years. We detected variability in management by age, ethnicity, psychiatric comorbidity, and hospital site. Our findings suggest limited utility to CTs in this setting (100% normal) and that workup can be safely informed by physical exam, which predicted abnormal MRI and LP results. We favor screening for adverse childhood experiences in FND patients. Hospitalization may be a rare opportunity for psychiatry contact.

Diagnosis of Functional Weakness and Functional Gait Disorders in Children and Adolescents

Functional neurological disorder is neurological dysfunction not primarily explained by pathophysiologic or structural abnormalities and can present in children and adolescents with limb weakness, gait abnormality, non-epileptic seizures or sensory changes. In this review article we focus primarily on the diagnosis of functional limb weakness and functional gait disorders, and how to differentiate functional neurological disorders from structural or pathologic neurological presentations of weakness or gait disturbance. Detailed history and attentive observation of a patient outside of the formal neurological examination can be pertinent to identifying inconsistency and incongruency in keeping with functional neurological presentations. Understanding of structural and physiologic neurological pathology is required to identify non-anatomical and non-pathological features consistent with a diagnosis of functional neurological disorder. Diagnosis is made on recognition of positive clinical features of a functional disorder on examination and is not based primarily on exclusion of a pathologic neurological disorder. Specific tests can be performed to elicit pathognomonic findings supportive of a diagnosis of functional limb weakness and gait disorders.

Functional neurological disorder: new subtypes and shared mechanisms

Functional neurological disorder is common in neurological practice. A new approach to the positive diagnosis of this disorder focuses on recognisable patterns of genuinely experienced symptoms and signs that show variability within the same task and between different tasks over time. Psychological stressors are common risk factors for functional neurological disorder, but are often absent. Four entities-functional seizures, functional movement disorders, persistent perceptual postural dizziness, and functional cognitive disorder-show similarities in aetiology and pathophysiology and are variants of a disorder at the interface between neurology and psychiatry. All four entities have distinctive features and can be diagnosed with the support of clinical neurophysiological studies and other biomarkers. The pathophysiology of functional neurological disorder includes overactivity of the limbic system, the development of an internal symptom model as part of a predictive coding framework, and dysfunction of brain networks that gives movement the sense of voluntariness. Evidence supports tailored multidisciplinary treatment that can involve physical and psychological therapy approaches.

Socio-demographic characteristics and psychopathological assessment in a sample of 13 paediatric patients with functional neurological disorders: A preliminary report

This observational study aims to characterize, from a socio-demographic and psychopathological perspective, a sample of children with Functional Neurological Disorders (FND). Thirteen paediatric patients (below 18 years old) with FND and their parents completed a battery of anamnestic and neuropsychological tests, assessing socio-demographic status, cognitive level, behavioural and emotional issues, depression, anxiety, alexithymic traits and dissociative symptoms. Five patients presented movement disorders (tremor, myoclonus and gait disorder), three patients psychogenic non-epileptic seizures and five patients sensitivity disturbances (pain, anaesthesia and paraesthesia). Cognitive profile was normal in 11 patients; academic performance was good in nine patients, but three had a diagnosis of Specific Learning Difficulty or Attention Deficit Hyperactivity Disorder. Precipitating events occurred in 11 patients. At the self-report questionnaires, mean scores close to the clinical cut off were documented with respect to affective and somatic problems. At the parent-report questionnaires, clinically significant mean scores were observed in the subscales assessing anxious-depressive symptoms and somatic complaints. We speculate that paediatric FND patients, although acknowledging the relevance of somatic symptoms, have difficulties in recognizing internal emotional states (that, instead, are easily recognized by their parents). The case of one FND patient was described. These preliminary data might help identifying different clinical phenotypes of paediatric FND.

How Positive Are Conversion Disorder Diagnoses?: Patterns of Referral to a Functional Neurology Clinic

ABSTRACT

The Diagnostic and Statistical Manual of Mental Disorders, 5th Edition (DSM-5) diagnostic criteria for conversion disorder have replaced the criterion of evidence of a "psychogenic" etiology with a criterion that patients must be "positively" diagnosed on the basis of their neurological assessment. We retrospectively studied referrals to a specialist functional neurology clinic to see how commonly the new criteria were met since DSM-5's introduction. Positive signs were reported in a quarter of referrals (26.5%), which was associated with diagnosticians' confidence (p = 0.001) and with the clinic confirming the diagnosis (p = 0.01). Our clinic found positive signs in 28.6% of the referrals. In 13 (13.3%) patients, the new criterion was not met. In conclusion, positive signs are diagnostically helpful but are only reported in a minority of assessments. A significant group of those currently believed to have conversion disorder would not meet the revised diagnostic criteria based on this.

Changing the culture of care for children and adolescents with functional neurological disorder

As members of a multidisciplinary team of professionals who treat children and adolescents with functional neurological (conversion) disorder (FND), we highlight the pressing need to develop an FND-informed culture of care that takes into account recent advances in our understanding of this group of patients. Stories of clinical encounters in health care settings from around the world-told by children and adolescents with FND, their parents, and health professionals-portray an outdated culture of care characterized by iatrogenic stigma, erosion of empathy and compassion within the clinician-patient relationship, and a lack of understanding of FND and its complex neurobiology. After a brief exploration of the outdated culture, we share our counterstories: how we and our colleagues have worked, and continue to work, to create an FND-informed culture in the health systems where we practice. We discuss the therapeutic use of child-friendly language. We also discuss a range of structural, educational, and process interventions that can be used to promote FND-informed beliefs and attitudes, FND-informed clinician-patient encounters, and FND-informed referral processes, treatment pathways, and therapeutic interventions.

Psychogenic non-epileptic seizures in children

Psychogenic Non-Epileptic Seizures (PNES) are a relatively common condition in children. While their clinical presentation resembles epileptic seizures, the underlying cause for PNES involves a multitude of bio-psychosocial factors. Patients may be misdiagnosed with epilepsy and subjected to unnecessary treatments, often delaying the diagnosis for years. A strong understanding of its symptomatology is essential for diagnosis of PNES. Successful management depends on effective teamwork that involves the neurologist as well as mental health professionals. This paper reviews the various aspects of PNES in children with emphasis on the clinical presentation, diagnosis as well as the underlying psychological basis and treatment.

Somatic symptom and related disorders in a tertiary paediatric hospital: prevalence, reach and complexity

Specialist paediatric services manage a variety of presentations of functional somatic symptoms. We aimed to describe the presentation and management of children and adolescents with somatic symptom and related disorders (SSRDs) requiring admission to a tertiary children's hospital with the objective of informing the development of a local clinical pathway. Patients admitted to any hospital department from May 2016 to November 2017 were identified through an electronic medical record (EMR)-linked diagnosis of SSRD. Each record was reviewed for demographic details and admission histories. The frequency of interspecialty consultations and multidisciplinary team (MDT) family meetings were recorded. One hundred twenty-three patients with SSRD were admitted on 203 occasions to 17 different departments. The median (range) age was 14.3 (7.3-18.3) years. Interspecialty consultations occurred in 84.6% of patients, and MDT family meetings occurred in 18.9% patients. SSRD was diagnosed as an inpatient in 79.9% patients, yet only 40.7% of patients, including those with multiple admissions, had SSRD recorded as a discharge diagnosis.Conclusion: Despite high rates of consultation with hospital teams, the frequency of MDT family meetings was low, and less than half the patients had SSRD documented at discharge. This affirms the value of developing a local clinical pathway. What is Known • Functional somatic symptoms are commonly seen in children and adolescents. • Few studies have explored the reach of functional somatic symptoms across a tertiary paediatric hospital; the majority of inpatient studies have focused on a limited set of disorders or cases referred to psychiatry departments. What is New • Symptoms that spanned multiple body systems were the most common presentation of SSRDs in admitted children and adolescents. • Somatic symptom disorders are less likely to be recorded as a discharge diagnosis compared with functional neurological symptom disorder.

Rapid Sequence MRI Protocol in the Evaluation of Pediatric Brain Attacks

BACKGROUND

The objective of our study was to evaluate the clinical utility of rapid sequence magnetic resonance imaging (MRI) utilizing diffusion-weighted imaging and fluid-attenuated inversion recovery sequences in children with acute ischemic strokes and nonstroke brain attacks.

METHODS

We performed a retrospective chart review of patients aged one month to 25 years for whom a pediatric stroke clinical pathway was activated. Diffusion-weighted imaging and fluid-attenuated inversion recovery were obtained followed by a complete MRI. Imaging was interpreted by a pediatric radiologist and the study neurologist. We collected information regarding patient demographics, neuroimaging results, and final diagnosis.

RESULTS

The Pediatric Stroke Clinical Pathway was activated for 59 patients of whom 52 were included for analysis. The majority of patients were female (n = 29, 55.8%) and African American (n = 32, 61.5%), with a median age of 12 years (interquartile range 9, 16). Six patients had an ischemic stroke. Seizures, migraines, and psychosomatic disorders (each with n = 7; 13.5%) were the most common nonstroke diagnoses. Diffusion-weighted imaging was more sensitive (100% [55.0% to 100%] versus 80 % [32% to 99%]) and specific (73.9% [68% to 74%] versus 37.2% [32% to 39%]) compared with fluid-attenuated inversion recovery in identification of an ischemic stroke. However, fluid-attenuated inversion recovery was useful in the identification of inflammatory and metabolic disorders.

CONCLUSION

Rapid sequence MRI can be utilized as a screening imaging modality in children with suspected brain attacks in cases where there may be delays in obtaining full sequence brain imaging.