Shape detection beyond the visual field using a visual-to-auditory sensory augmentation device

Current advancements in both technology and science allow us to manipulate our sensory modalities in new and unexpected ways. In the present study, we explore the potential of expanding what we perceive through our natural senses by utilizing a visual-to-auditory sensory substitution device (SSD), the EyeMusic, an algorithm that converts images to sound. The EyeMusic was initially developed to allow blind individuals to create a spatial representation of information arriving from a video feed at a slow sampling rate. In this study, we aimed to use the EyeMusic for the blind areas of sighted individuals. We use it in this initial proof-of-concept study to test the ability of sighted subjects to combine visual information with surrounding auditory sonification representing visual information. Participants in this study were tasked with recognizing and adequately placing the stimuli, using sound to represent the areas outside the standard human visual field. As such, the participants were asked to report shapes' identities as well as their spatial orientation (front/right/back/left), requiring combined visual (90° frontal) and auditory input (the remaining 270°) for the successful performance of the task (content in both vision and audition was presented in a sweeping clockwise motion around the participant). We found that participants were successful at a highly above chance level after a brief 1-h-long session of online training and one on-site training session of an average of 20 min. They could even draw a 2D representation of this image in some cases. Participants could also generalize, recognizing new shapes they were not explicitly trained on. Our findings provide an initial proof of concept indicating that sensory augmentation devices and techniques can potentially be used in combination with natural sensory information in order to expand the natural fields of sensory perception.

AB1450 CHARACTERISTICS, OUTCOME AND FACTORS ASSOCIATED WITH EVOLUTION TO MULTIPLE MYELOMA AND SURVIVAL IN PATIENTS WITH SOLITARY BONE PLASMACYTOMA

Background

Solitary bone plasmacytoma (SPB) is a rare malignancy whose main risk is progression to multiple myeloma (MM).

Objectives

To describe the characteristics and outcome of patients treated for SBP and to identify factors associated with progression to MM and death.

Methods

This retrospective study was conducted between 1992 and 2020. Patients were included if they met the International Myeloma Working Group (IMWG) criteria for the diagnosis of SBP (1). Treatment response was assessed according to the IMWG criteria (2) for patients with detectable monoclonal protein and according to radiological response only for non-secretory SBP. Hazard ratios (HR) and their 95% confidence intervals (CI) were estimated by Cox proportional hazards models, adjusted for potential confounders. When available, 18F-fluorodeoxyglucose positron emission tomography/computed tomography (18F-FDG PET/CT) were reviewed by two experienced nuclear physicians.

Results

A total of 77 patients diagnosed with SBP were included. The median age was 59 years [range: 27-89]. Median follow-up duration was 87.1 months [range: 1.6-306.8]. At the end of the follow-up, 45 (58.4%) patients had developed a MM and 13 (16.9%) deaths occurred, including 10 patients with progression to MM. Five-year myeloma-free survival and overall survival were 47.9% and 86.8% respectively. All patients received radiotherapy with a median dose of 45 Grays [range: 30-55]. Chemotherapy was prescribed in 32 (41.6%) patients, concomitant to radiotherapy in 8, because of high risk of local extension, or adjuvant in 24 because of persistent disease after radiotherapy. Chemotherapy included mainly immunomodulatory drugs (28/32 (87.5%)) and/or proteasome inhibitors (11/32 (34.4%)) based combinations. Adjuvant chemotherapy after radiotherapy was associated with a reduced risk of MM compared to patients treated by radiotherapy alone, in a multivariate model adjusted for potential confounding factors, including response after radiotherapy alone (adjuvant chemotherapy versus no chemotherapy, HR 0.30, 95%CI [0.14-0.64]). Response to the first line of treatment (radiotherapy +/- chemotherapy) was the main factor associated with progression to MM (complete response versus partial response or progressive disease, HR 0.25, 95%CI [0.11-0.59]) and death (HR 0.22, 95%CI [0.05-0.99]). A non-significant trend between bone marrow plasmacytosis ≥ 5% at diagnosis and higher risk of MM was observed (≥ 5% versus <5%, HR 2.40, 95%CI [1.00-5.74]). 18F-FDG PET/CT images were available for review in only 36/77 patients. A significant decrease of 18F-FDG uptake after treatment was observed whereas the lesion size was unchanged. No association was observed with the risk of MM but the limited available images may have resulted in underpowered analyses.

Conclusion

In this large study of patients with SBP, we observed that even though mostly prescribed for insufficient response to radiotherapy alone, treatment with adjuvant chemotherapy was associated with a decreased risk of evolution to MM, suggesting that this treatment might be systematically prescribed in addition to radiotherapy alone. These observations need to be confirmed and justify conduction of a prospective trial evaluating adjuvant chemotherapy in patients with SBP.

References

[1]Rajkumar SV, Dimopoulos MA, Palumbo A, Blade J, Merlini G, Mateos M-V, et al. International Myeloma Working Group updated criteria for the diagnosis of multiple myeloma. Lancet Oncol. nov 2014;15(12):e538-548.

[2]Kumar S, Paiva B, Anderson KC, Durie B, Landgren O, Moreau P, et al. International Myeloma Working Group consensus criteria for response and minimal residual disease assessment in multiple myeloma. Lancet Oncol. août 2016;17(8):e328‑46.

Acknowledgements

The authors are indebted to all participants for their continued participation.

Disclosure of Interests

None declared

P2733Prognostic value of cardiac dysautonomia in AL amyloidosis

Introduction

Cardiac involvement is the major prognostic factor in patients with light chain amyloidosis (AL). Cardiac dysautonomia can occur early in amyloidosis and can be assess by Iodine-123-metaiodobenzylguanidine (123I-MIBG) scintigraphy. Its prognostic value has been shown in TTR amyloidosis but is unknown in AL amyloidosis. We aimed to evaluate the prognosis impact of cardiac dysautonomia in patients with AL amyloidosis.

Methods

We carried out a prospective study in consecutive patients with biopsy-proven AL amyloidosis. All patients underwent clinical examination, EKG, echocardiography, cardiac MRI and biological tests. The 2012 Mayo clinic prognostic classification was calculated by using blood levels of NT-proBNP, cardiac T troponin and the differential of free light chains as recommended. The sympathetic cardiac innervation was assessed by using 123I-MIBGscintigraphy and measurement of the heart-to-mediastinum uptake ratio (late H/M) in the anterior view of the chest. A cardiac denervation was defined by late H/M <1.8 4h after injection of 3 MBq/kg of 123I-MIBG. The primary end-point was all-cause mortality during follow-up.

Results

Fifty consecutive patients with AL amyloidosis were included. The median age was 68 years old [58–73]. By using both echocardiography and MRI, cardiac involvement was diagnosed in 33 patients (66%) and thirteen of these patients were NYHA class III or IV. By using Mayo clinic classification, patients were I, II, III and IV classes in 9 (18%), 14 (28%), 16 (32%) and 11 (22%) cases respectively. According to echocardiographic data, the median wall thickness of left ventricle was 13 mm [12–15]. The late H/M was 1.51 [1.33–1.67]. Cardiac denervation was found in 44 patients (88%). The 6 patients (12%) with a normal late H/M had no cardiac amyloidosis involvement.

During a median follow-up of 24 months, 9 patients (18%) died. The area under the ROC curve of late H/M for predicting death was 0.74 (CI 95% 0.58–0.86). According to this curve, the best threshold was 1.44 and 7 of the 9 patients who died had late H/M ≤1.44. The figure shows the 2 year-survival according to late H/M. Late H/M ≤1.44 predicted all-cause death irrespective of the Mayo clinic classification: HR 8.0 (CI 95% 2.1–63) after adjustment on the Mayo clinic score (p=0.005). In addition, unplanned hospitalization for heart failure occurred in 8 patients with late H/M ≤1.44 versus 3 patients with late H/M >1.44 (p=0.03).

Survival according to late H/M

Conclusion

Late H/M ≤1.44 is predictive of adverse outcomes in patients with AL amyloidosis, independently of the Mayo Clinic prognostic classification.

Effect of the KF post-deposition treatment on grain boundary properties in Cu(In, Ga)Se2 thin films

Significant power conversion efficiency improvements have recently been achieved for thin-film solar cells based on a variety of polycrystalline absorbers, including perovskites, CdTe, and Cu(In,Ga)Se₂ (CIGS). The passivation of grain boundaries (GBs) through (post-deposition) treatments is a crucial step for this success. For the case of CIGS, the introduction of a potassium fluoride post-deposition treatment (KF-PDT) has boosted their power conversion efficiency to the best performance of all polycrystalline solar cells. Direct and indirect effects of potassium at the interface and interface-near region in the CIGS layer are thought to be responsible for this improvement. Here, we show that also the electronic properties of the GBs are beneficially modified by the KF-PDT. We used Kelvin probe force microscopy to study the effect of the KF-PDT on the CIGS surface by spatially resolved imaging of the surface potential. We find a clear difference for the GB electronic properties: the KF-PDT increases the band bending at GBs by about 70% and results in a narrower distribution of work function values at the GBs. This effect of the KF-PDT on the GB electronic properties is expected to contribute to the improved efficiency values observed for CIGS thin-film solar cells with KF-PDT.

Evaluation of different buffer materials for solar cells with wide-gap Cu2ZnGeSxSe4−x absorbers

In this work kesterite-type Cu₂ZnGeS_xSe_4−x (CZGSSe) absorbers were coated with four different buffer layer materials: CdS, In₂S₃, Zn(O,S) and CdIn₂S₄.

Verbal short-term memory span in children: long-term modality dependent effects of intrauterine growth restriction

BACKGROUND

Recent reports showed that children born with intrauterine growth restriction (IUGR) are at greater risk of experiencing verbal short-term memory span (STM) deficits that may impede their learning capacities at school. It is still unknown whether these deficits are modality dependent.

METHODS

This long-term, prospective design study examined modality-dependent verbal STM functions in children who were diagnosed at birth with IUGR (n = 138) and a control group (n = 64). Their STM skills were evaluated individually at 9 years of age with four conditions of the Visual-Aural Digit Span Test (VADS; Koppitz, 1981): auditory-oral, auditory-written, visuospatial-oral and visuospatial-written. Cognitive competence was evaluated with the short form of the Wechsler Intelligence Scales for Children--revised (WISC-R95; Wechsler, 1998).

RESULTS

We found IUGR-related specific auditory-oral STM deficits (p < .036) in conjunction with two double dissociations: an auditory-visuospatial (p < .014) and an input-output processing distinction (p < .014). Cognitive competence had a significant effect on all four conditions; however, the effect of IUGR on the auditory-oral condition was not overridden by the effect of intelligence quotient (IQ).

CONCLUSIONS

Intrauterine growth restriction affects global competence and inter-modality processing, as well as distinct auditory input processing related to verbal STM functions. The findings support a long-term relationship between prenatal aberrant head growth and auditory verbal STM deficits by the end of the first decade of life. Empirical, clinical and educational implications are presented.

Tyrosine kinase B receptor and its activated neurotrophins in ovaries from human fetuses and adults

The signals initiating the growth of primordial follicles are unknown. Growth factors such as neurotrophin 4/5 (NT-4/5) and brain-derived neurotrophic factor (BDNF) may play a role in this process. To investigate the expression of NT-4/5 and BDNF and their receptor tyrosine kinase B (TrkB) in the early developing follicles, we fixed and froze 12 ovarian samples from adolescents/adults and 31 ovaries from human fetuses. The fixed samples were prepared for immunohistochemical staining for NT-4/5, BDNF and the TrkB receptor. Total RNA was extracted from the frozen ovarian samples, and the expression of NT-4/5, BDNF and the TrkB receptor (full length and two truncated isoforms) was investigated by RT-PCR. Products were resolved by 1% agarose gel electrophoresis and image analysis. Immunohistochemical staining revealed the expression of NT-4/5 and BDNF mainly in oocytes and, in a minority of samples, also in the granulosa cells (GCs); TrkB receptor was identified in oocytes and GCs. Transcripts of NT-4/5, BDNF and all forms of TrkB receptor were identified in the samples. To elucidate whether indeed NT-4/5 and BDNF are involved in growth initiation of human primordial follicles, they should be added to the culture medium.

Deficits in spatial orientation of children with intrauterine growth retardation

The spatial orientation of intrauterine growth retarded (IUGR) children versus age-matched controls was examined using two spatial tests. The first test was the radial arm maze (RAM), a navigational test frequently used in animal models. The second test was a subtest from the Kaufman assessment battery for children (K-ABC). The IUGR group comprised 28 children aged 6 years. The control group comprised 29 appropriate-for-gestational age children. The performance of the IUGR children was significantly inferior to controls in both tests. In the RAM test, the ratio between the correct entrances to the total entrances was significantly lower in the IUGR group than in the control group (P<0.001). In the K-ABC, the IUGR group could not perform as well as control children (P<0.001). These results suggest that spatial orientation in IUGR children is inferior to their age-matched controls, possibly contributing to their potential learning difficulties. The present results also suggest that the RAM can be potentially used to test spatial orientation of children at-risk.

The effect of intrauterine growth restriction on the development and health of children

The neurodevelopmental and cognitive outcome of long-term Intrauterine Growth Restriction (IUGR) has been followed up from pregnancy to school age at the Tel Aviv Child Development Centre.

Blood pressure values in children with intrauterine growth retardation

BACKGROUND

Low birth weight has been shown to be strongly related to hypertension in adult life.

OBJECTIVES

To determine whether blood pressure is higher in children with intrauterine growth retardation than in control subjects.

METHODS

Blood pressure was measured in 58 children aged 4-6 years with IUGR and in 58 age-matched controls. The control children, whose birth weight was appropriate for gestational age, were also matched for gestational age.

RESULTS

The children with IUGR had significantly higher mean values of systolic (P < 0.05) and diastolic blood pressures (P < 0.05) and mean arterial pressure (P < 0.05). Significant differences in blood pressure values were found between preterm IUGR (n = 21) and preterm controls (P < 0.05).

CONCLUSIONS

These data indicate that children with IUGR may be at higher risk of hypertension already in childhood.

Betalains--a new class of dietary cationized antioxidants

Antioxidant nutrients from fruits and vegetables are believed to be a class of compounds that exert their effects in humans by preventing oxidative processes which contribute to the onset of several degenerative diseases. This study found a new class of dietary cationized antioxidants in red beets (Beta vulgaris L.). These antioxidants are betalains, and the major one, betanin, is a betanidin 5-O-beta-glucoside. Linoleate peroxidation by cytochrome c was inhibited by betanin, betanidin, catechin, and alpha-tocopherol with IC(50) values of 0.4, 0.8, 1.2, and 5 microM, respectively. In addition, a relatively low concentration of betanin was found to inhibit lipid peroxidation of membranes or linoleate emulsion catalyzed by the "free iron" redox cycle, H(2)O(2)-activated metmyoglobin, or lipoxygenase. The IC(50) inhibition of H(2)O(2)-activated metmyoglobin catalysis of low-density lipoprotein oxidation by betanin was <2.5 microM and better than that of catechin. Betanin and betanidin at very small concentrations were found to inhibit lipid peroxidation and heme decomposition. During this reaction, betanidin was bleached completely, but betanin remained unchanged in its absorption. This difference seems to derive from differing mechanisms of protection by these two compounds. The high affinity of betanin and betanidin for membranes was demonstrated by determining the rate of migration of the compounds through a dialysis tube. Betanin bioavailability in humans was demonstrated with four volunteers who consumed 300 mL of red beet juice, containing 120 mg of the antioxidant. The betacyanins were absorbed from the gut and identified in urine after 2-4 h. The calculated amount of betacyanins found in the urine was 0.5-0.9% of that ingested. Red beet products used regularly in the diet may provide protection against certain oxidative stress-related disorders in humans.

Prognostic significance of hyperechogenic lesions in the basal ganglia and thalamus in neonates

Neonatal cranial ultrasonography at times reveals hyperechogenic lesions in the basal ganglia and thalamus. These lesions have been attributed to a wide variety of pathologic states, among them toxoplasmosis, rubella, cytomegalovirus, and herpes simplex (TORCH) infections, chromosomal abnormalities, and asphyxia. The clinical significance in terms of the neurodevelopmental outcome of this radiologic abnormality is unknown. We performed a developmental evaluation on 16 children aged 2 to 6 years in whom neonatal cranial ultrasonography had demonstrated hyperechogenic lesions in the basal ganglia or thalamus and had no other neurodevelopmental risk factors. There was no significant difference between the average Developmental Quotient of the target population and the normal population in regard to developmental status. We conclude that in our population, an isolated finding of hyperechogenic lesions in the basal ganglia is probably not a predictor of poor neurodevelopmental outcome.

Transient oromotor deficits in children with benign childhood epilepsy with central temporal spikes

PURPOSE

To describe transient oromotor deficits in benign childhood epilepsy with centrotemporal spikes (BCECTS), an idiopathic age-specific epileptic syndrome with a benign course.

METHODS

Five children with BCECTS and intermittent dysarthria and drooling not in the context of typical clinical seizures are presented.

RESULTS

The periods of oromotor deficits correlated with increased seizure frequency in all children. Concomitant EEGs that were recorded during periods of dysarthria in four of the children revealed focal electrographic seizures. The reported children did not differ from other patients with BCECTS in any other respect.

CONCLUSIONS

Transient oromotor dysfunction is a rare ictal phenomenon that occurs in children with BCECTS with no other unique clinical features.

No evidence of epilepsy following endoscopic third ventriculostomy: a short-term follow-up

Patients with ventriculo-peritoneal shunts are predisposed to various complications, including the appearance of seizures over time. The high rate of complications prompted an interest in alternative procedures such as endoscopic third venticulostomy (ETV) in selected patients. From 1996 to 1998, 42 patients underwent ETV in our center. Of the 27 operated children who were followed for an average of 32 months, none experienced seizures during that time. We conclude that, in addition to other benefits, ETV minimizes the risk of epilepsy following shunt insertion, probably due to the lack of direct cortical insult.

Worster-Drought and congenital perisylvian syndromes-a continuum?

A 5-year-old female was evaluated because of severe speech and expressive language delay. On examination, she could hardly speak and communicated through gestures. She manifested severe dysarthria and difficulty in protruding and moving her tongue laterally. She lacked coordination of the swallowing process, with drooling and an increased mental reflex. Her cognitive development was normal, and no associated neurologic dysfunction of the limbs was noted. On follow-up, the child experienced two episodes of seizures at 6 years of age. Magnetic resonance imaging of the brain demonstrated perisylvian and frontal polymicrogyria. Clinical and radiologic findings demonstrated a similarity and continuum between congenital suprabulbar paresis (Worster-Drought syndrome) and perisylvian syndrome.

Experimental intrauterine growth retardation alters renal development

Vascular placental insufficiency is considered a common pathogenic factor in human intrauterine growth retardation (IUGR), resulting in small-for-gestational-age, asymmetric newborns. IUGR neonates experience higher morbidity and mortality rates, as well as a possible contribution towards late sequelae, such as hypertension, and cardiovascular disease in adulthood. To simulate vascular placental insufficiency, an experimental rabbit IUGR model was used. Intrauterine growth retardation was achieved by ligation of 25-30% uteroplacental vessels of half of the fetuses during the last third of gestation. Ischemic fetuses were significantly small, asymmetric, and had a disproportionately small body with a relatively large head. The kidneys from all groups were analyzed for relative estimated glomeruli number (REGN) using an unbiased blind design. The glomeruli number was significantly reduced in the asymmetric IUGR rabbit fetuses, probably due to decreased renal vascular supply. Our results support the concept that the reduced number of glomeruli may contribute to impaired renal function, thus predisposing to neonatal renal dysfunction and late sequelae, such as adult hypertension. This study emphasizes the clinical importance of early IUGR diagnosis and prevention.

Six-year follow-up of children with intrauterine growth retardation: long-term, prospective study

This prospective study was designed to characterize the neurodevelopmental and cognitive difficulties specific to children with intrauterine growth retardation and to detect early clinical predictors of these difficulties. Eighty-one children with intrauterine growth retardation were monitored up to 6 to 7 years of age using biometric parameters, perinatal risk questionnaires, and detailed neurodevelopmental and cognitive assessments. Forty-one children served as age-matched, appropriate for gestational age controls. A significant difference in growth parameters (P < .001), neurodevelopmental score (P < .05), and IQ (P < .05) was found between the children with intrauterine growth retardation and controls. A specific profile of difficulties in coordination, lateralization, spatial and graphomotor skills, and abundance of associated movements is typical of the children with intrauterine growth retardation and hints at possible later learning disabilities. The clinical parameters best predicting neurodevelopmental outcome were the neonatal risk score (P < .05) and the weight and height at 6 years of age (P < .05). The children with intrauterine growth retardation with neonatal complications had lower neurodevelopmental scores than the controls but no difference in IQ. Intrauterine growth retardation children diagnosed prenatally had the same neurodevelopmental and IQ scores as those diagnosed at birth, probably due to the careful perinatal and obstetric care provided. Children with intrauterine growth retardation demonstrate a specific profile of neurodevelopmental disabilities at preschool age. Early diagnosis and intervention could probably reduce these difficulties to a minimum.

Unprovoked seizures after complex febrile convulsions

Children with complex febrile convulsions bear a higher risk of developing epilepsy than children with simple febrile convulsions. Complex febrile convulsions are defined by the presence of prolonged seizures, partial seizures and multiple seizures occurring during the same day. The aim of this study is to delineate the relative significance of each of the three criteria defining complex febrile convulsions. Fifty-seven out of 477 children (12%) admitted for febrile convulsions had complex febrile convulsions and normal neurological examination. Follow-up was available for 48 (84%) of them. Thirteen of these 48 (27%) had epilepsy at follow-up. The mean age of seizure onset among the patients with subsequent afebrile seizures was significantly lower than the rest (10.8 months versus 16.8 months). The patients with partial febrile convulsions showed a trend toward a higher risk (45%) of developing epilepsy than the patients with multiple febrile convulsions (21%).

Methylenetetrahydrofolate reductase deficiency: importance of early diagnosis

Methylenetetrahydrofolate reductase deficiency is the most common inborn error of folate metabolism and should be suspected when homocystinuria is combined with hypomethioninemia. The main clinical findings are neurologic signs such as severe developmental delay, marked hypotonia, seizures, microcephaly, apnea, and coma. Most patients present in early life. The infantile form is severe, with rapid deterioration leading to death usually within 1 year. Treatment with betaine has been shown to be efficient in lowering homocysteine concentrations and returning methionine to normal, but the clinical response is variable. We report two brothers with methylenetetrahydrofolate reductase deficiency: the first was undiagnosed and died at 8 months of age from neurologic deterioration and apnea, while his brother, who was treated with betaine from the age of 4 months, is now 3 years old and has developmental delay.

Alternating hemiplegia of childhood in half-sisters

We present the family of two girls affected with alternating hemiplegia of childhood who were born to the same mother and different fathers. Previous reports suggested mitochondrial dysfunction as an etiologic mechanism for this disorder. Muscle biopsy, including a measurement of the respiratory chain enzymes, performed in one of the sisters showed no mitochondrial abnormalities. The mode of inheritance is not certain, but an autosomal-dominant gene is most likely.

Neurologic presentations of mitochondrial disorders

This article describes the neurologic presentations of children with mitochondrial disorders. The charts of 42 children with highly suspect mitochondrial disorders were reviewed. Thirty-seven children were diagnosed as having definite mitochondrial disorders based on a suggestive clinical presentation and at least one accepted criteria, while in five patients the diagnosis remained probable. All patients had nervous system involvement, but it was the presenting symptom in 28 of 42. Eighteen children had normal intelligence and 24 had mental retardation or developmental delay at the onset of their disease. Twenty-five patients had either an acute regression or a progressive encephalopathy. The most frequent neurologic manifestations were abnormal tone, seizures, extrapyramidal movements, and autonomic dysfunction. The eyes were involved in 11 children. Nerve deafness was found in seven patients. Myopathy was found in only six patients. In conclusion, a complex neurologic picture, especially with other organ involvement, warrants a full mitochondrial evaluation.

Mental retardation subsequent to refractory partial seizures in infancy

Whether seizures are the direct cause of cognitive deterioration in epileptic children is undetermined. This retrospective study aimed to delineate a subgroup of pediatric patients with cognitive deterioration and refractory seizures in the absence of recognized causes for mental retardation. Of the 80 children identified as having mental retardation and refractory seizure disorder, seven (8.7%) had normal cognitive development until at least 1 year of age. Their metabolic status was normal. Five of them suffered repeated frequent partial seizures with onset in the first year of life and two had repeated episodes of status epilepticus. All seven had similar characteristics of early onset partial seizures, six of them had partial seizures secondarily generalized and one had complex partial seizures. The time of peak cognitive deterioration correlated with increases in seizure frequency during that period. Evaluation revealed a well-defined epileptic focus in the absence of neuroimaging abnormality except for hippocampal atrophy in the two children with complex partial seizures and a small vascular malformation in one child. Uncontrolled partial seizures in the first months of life may result in cognitive deterioration.

Neurodevelopmental outcome in children with intrauterine growth retardation: a 3-year follow-up

The study was designed to detect early clinical predictors of developmental outcome in children with intrauterine growth retardation. Eighty-five children with intrauterine growth retardation were followed up prospectively to 3 years of age, using biometric parameters, perinatal risk questionnaires, and neurodevelopmental evaluations. Forty-two children served as controls. A significant difference in neurodevelopmental score at 3 years of age was noted between the intrauterine growth retardation and control groups (P < .001). In the intrauterine growth retardation group, the clinical parameters that most significantly correlated with outcome were cephalization index (head circumference:birthweight ratio), neonatal risk score, and birthweight. The best predictor of 3-year outcome was the cephalization index (P < .01). The children with intrauterine growth retardation with neonatal complications had significantly lower IQ scores (P < .05) and a poorer neurodevelopmental outcome (P < .01) than those without complications. Children with intrauterine growth retardation are at higher risk for developmental disabilities than are controls, especially in the presence of neonatal complications and a high cephalization index.

Fetal muscle biopsy as a diagnostic tool in Duchenne muscular dystrophy

Duchenne muscular dystrophy (DMD) is a relentless progressive disorder, leading to severe disability during childhood and death in adolescence or early adulthood. In most families, prenatal diagnosis is readily achieved by molecular detection of DNA deletions using chorionic villi or amniocytes, or by linkage analysis. In some cases, however, molecular methods fail to provide a definitive diagnosis and in such cases in utero fetal muscle biopsy may serve as a diagnostic option. We describe three families in whom fetal muscle biopsy was performed, focusing on the prenatal diagnostic dilemmas, the indications and timing for in utero fetal muscle biopsy, and the difficulties encountered.

Urinary organic acid screening in children with developmental language delay

The prevalence of 3-methylglutaconic aciduria was evaluated among children with developmental language disorders. A urine specimen was obtained from 40 children referred for developmental language delay to the Tel-Aviv Child Development Center during 12/96-6/97 and from 50 age-matched controls. Urine organic acids were analysed by gas chromatography-mass spectrometry. Urinary 3-methylglutaconic acid was quantified. A mildly increased excretion of 3-methylglutaconic acid was found in 8 children with developmental language delay. The combined excretion of 3-methylglutaconic and 3-methylglutaric acid was increased in 9 patients. There were no differences in the excretion of other organic acids. The patients with elevated 3-methylglutaconic acid did not differ from the other patients with developmental language disorders in any of the parameters evaluated. Mildly elevated urinary levels of 3-methylglutaconic acid may be a marker of a still undefined metabolic disorder presenting with developmental language delay. A further study in large groups of children with different developmental disorders is mandatory.

Multiple presentation of mitochondrial disorders

The aim of this study was to assess the heterogeneous clinical presentations of children with mitochondrial disorders evaluated at a metabolic neurogenetic clinic. The charts of 36 children with highly suspected mitochondrial disorders were reviewed. Thirty one children were diagnosed as having a mitochondrial disorder, based on a suggestive clinical presentation and at least one of the accepted laboratory criteria; however, in five children with no laboratory criteria the diagnosis remained probable. All of the patients had nervous system involvement. Twenty seven patients also had dysfunction of other systems: sensory organs in 15 patients, cardiovascular system in five, gastrointestinal system in 20, urinary system in four, haematopoietic system in four, and endocrine system in nine. The clinical presentation was compatible with an established syndrome in only 15 children. Severe lactic acidosis or ragged red muscle fibres were encountered in very few patients. These results suggest that mitochondrial disorders should be evaluated in children presenting with a complex neurological picture or multisystem involvement.