RESUMEN
BACKGROUND: The patients with early-onset epileptic encephalopathy (EOEE) suffer from neurodevelopmental delay. The aim of this study was to analyze the clinical manifestations and amplitude-integrated encephalogram (aEEG) characteristics of infants with EOEE with onset within the neonatal period, to make early diagnosis to improve the prognosis. METHODS: One-hundred and twenty-eight patients with neonatal seizure were enrolled and followed up till 1 year old. Sixty-six neonates evolved into EOEE were as the EOEE group, the other 62 were as the non-EOEE (nEOEE) group. Then we compared the clinical and aEEG characteristics between the two groups to analyze the manifestations in neonates with EOEE. RESULTS: Compared to the nEOEE group, the incidence of daily seizure attacks, more than two types of convulsions, more than two antiepileptic drugs (AEDs) application, severely abnormal aEEG background, absence of cyclicity, and more than two seizures detection were significantly higher in the EOEE group (P < 0.05) (97% vs. 54.8%; 30.3% vs. 14.5%; 97.0% vs. 25.4%; 39.4% vs. 3.2%; 57.6% vs. 9.7%; and 56% vs. 3.2%, respectively). Severely abnormal background pattern (odds ratio [OR] = 0.081, 95% confidence interval [CI]: 0.009-0.729, P = 0.025) and more than two seizures detection by aEEG (OR = 0.158, 95% CI: 0.043-0.576, P = 0.005) were the independent risk factors for the evolvement into EOEE. The upper and lower margins of active sleep (AS) and quiet sleep (QS) were significantly higher in EOEE group than those of the control group (P < 0.05) (34.3 ± 13.6 vs. 21.3 ± 6.4; 9.9 ± 3.7 vs. 6.7 ± 2.2; 41.2 ± 15.1 vs. 30.4 ± 11.4; and 11.9 ± 4.4 vs. 9.4 ± 4.0; unit: µV, respectively). AS upper margin was demonstrated a higher diagnostic specificity and sensitivity for EOEE than another three parameters according to the receiver operating characteristic curves; the area under the curve was 0.827. CONCLUSIONS: The clinical characteristics of the neonatal seizure which will evolve into EOEE were more than two AEDs application, high seizure frequency (daily attack), and more than two types of the seizure. Significant high voltage, severely abnormal background, absence of cyclicity, and more than two seizures detected on aEEG were the meaningful indicators to the prediction of EOEE.
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Electroencefalografía/métodos , Convulsiones/diagnóstico , Anticonvulsivantes/uso terapéutico , Diagnóstico Precoz , Femenino , Humanos , Lactante , Recién Nacido , Masculino , Factores de Riesgo , Convulsiones/tratamiento farmacológicoRESUMEN
OBJECTIVE: To study the relationship between STXBP1 gene mutations and refractory seizures with unknown causes in newborns. METHODS: The coding region of STXBP1 gene was detected using direct Sanger sequencing in 11 newborns with refractory seizures of unknown causes. RESULTS: STXBP1 gene mutation was found in 1 out of 11 patients. It was a missense mutation: c.1439C>T (p.P480L). CONCLUSIONS: STXBP1 gene mutation can be found in neonatal refractory seizures of unknown causes, suggesting a new approach of further research of this disease.
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Proteínas Munc18/genética , Mutación , Convulsiones/genética , Humanos , Recién NacidoRESUMEN
OBJECTIVE: To study the relationship between the degree of white matter damage and changes in brain function in premature infants early after birth according to amplitude-integrated electroencephalogram (aEEG) and raw EEG (with burst-suppression patterns). METHODS: Thirty-eight premature infants of less than 32 weeks' gestational age and with white matter damage, including 20 cases of mild white matter damage and 18 cases of severe white matter damage, were included in the study. Forty-two premature infants without white matter damage were selected as a control group. After birth, they were examined using aEEG and brain ultrasound once a week until four weeks after birth or a corrected gestational age of 32 weeks. The white matter damage and control groups were compared in terms of aEEG patterns and amplitudes and burst suppression ratio (BSR) on EEG. RESULTS: The white matter damage and control groups had highly discontinuous patterns and had no complete sleep cycles. The lower amplitude was significantly smaller in the severe white matter damage subgroup than in the mild white matter damage subgroup and control group. There was alternating burst-suppression activity on the raw EEG in the white matter damage and control groups; and the severe white matter damage subgroup had a significantly longer suppression time and a significantly higher BSR on EEG compared with the mild white matter damage subgroup and control group. CONCLUSIONS: Brain function monitoring should be performed in premature infants with white matter damage early after birth so as to detect cases of severe white matter damage in time.
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Encéfalo/patología , Electroencefalografía , Recien Nacido Prematuro/fisiología , Leucomalacia Periventricular/fisiopatología , Humanos , Recién NacidoRESUMEN
A case of combined methylmalonic aciduria and homocysteinemia presenting with hydrocephalus as an early manifestation was reported for its rarity to see and to discuss the relationship between metabolic diseases and hydrocephalus by literature review. The case was an infant with seizures and hydrocephalus as an early manifestation of the disease, combined with macrocyticanemia, development retardation and visual hearing function lesions. The EEG showed hypsarrhythmia and the MRI showed hydrocephalus. Plasma homocysteinemia level increased (143.06 umol/L) and urine methylmalonic aciduria was 1483 times beyond normal. Based on gene analysis results and increased methylmalonic aciduria and homocysteinemia levels, combined methylmalonic aciduria and homocysteinemia was confirmed, presenting CblC defect (gene mutations homozygous for c.609G>A). After treatment by venous injection of vitamin B12, oral folic acid and betaine, seizures were controlled and development was progressive with ventricle retraction. It was concluded that hydrocephalus can be the early presentation in children with combined methylmalonic aciduria and homocysteinemia. Doctors should carry out metabolic disease screening for patients with hydrocephalus, especially when the cause of hydrocephalus is uncertain.
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Errores Innatos del Metabolismo de los Aminoácidos/complicaciones , Hidrocefalia/etiología , Hiperhomocisteinemia/complicaciones , Humanos , Lactante , MasculinoRESUMEN
BACKGROUND: There is a large number (1.5 million per year) of premature births in China. It is necessary to obtain the authentic incidences of intraventricular hemorrhage (IVH) and periventricular leukomalacia (PVL), the common brain injuries, in Chinese premature infants. The present multicenter study aimed to investigate the incidence of brain injuries in premature infants in ten urban hospitals in China. METHODS: The research proposal was designed by the Subspecialty Group of Neonatology of Pediatric Society of the Chinese Medical Association. Ten large-scale urban hospitals voluntarily joined the multicenter investigation. All premature infants with a gestational age ≤ 34 weeks in the ten hospitals were subjected to routine cranial ultrasound within three days after birth, and then to repeated ultrasound every 3-7 days till their discharge from the hospital from January 2005 to August 2006. A uniform data collection sheet was designed to record cases of brain injuries. RESULTS: The incidences of overall IVH and severe IVH were 19.7% (305/1551) and 4.6% (72/1551), respectively with 18.4% (56/305) for grade 1, 58.0% (177/305) for grade 2, 17.7% (54/305) for grade 3 and 5.9% (18/305) for grade 4 in nine hospitals. The incidences of overall PVL and cystic PVL were 5.0% (89/1792) and 0.8% (14/1792) respectively, with 84.3% (75/89) for grade 1, 13.5% (12/89) for grade 2, and 2.2% (2/89) for grade 3 in the ten hospitals. The statistically significant risk factors that might aggravate the severity of IVH were vaginal delivery (OR=1.883, 95% CI: 1.099-3.228, P=0.020) and mechanical ventilation (OR=4.150, 95% CI: 2.384-7.223, P=0.000). The risk factors that might result in the development of cystic PVL was vaginal delivery (OR=21.094, 95% CI: 2.650-167.895, P=0.000). CONCLUSIONS: The investigative report can basically reflect the incidence of brain injuries in premature infants in major big cities of China. Since more than 60% of the Chinese population live in the rural areas of China, it is expected to undertake a further multicenter investigation covering the rural areas in the future.
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Lesiones Encefálicas/epidemiología , China , Femenino , Edad Gestacional , Hospitales Urbanos , Humanos , Incidencia , Recién Nacido , Recien Nacido Prematuro , MasculinoRESUMEN
OBJECTIVE: To investigate the efficacy and safety of selective head cooling with mild systemic hypothermia in hypoxic-ischemic encephalopathy (HIE) in newborn infants. STUDY DESIGN: Infants with HIE were randomly assigned to the selective head cooling or control group. Selective head cooling was initiated within 6 hours after birth to a nasopharyngeal temperature of 34 degrees+/-0.2 degrees C and rectal temperature of 34.5 degrees to 35.0 degrees C for 72 hours. Rectal temperature was maintained at 36.0 degrees to 37.5 degrees C in the control group. Neurodevelopmental outcome was assessed at 18 months of age. The primary outcome was a combined end point of death and severe disability. RESULTS: One hundred ninety-four infants were available for analysis (100 and 94 infants in the selective head cooling and control group, respectively). For the selective head cooling and control groups, respectively, the combined outcome of death and severe disability was 31% and 49% (OR: 0.47; 95% CI: 0.26-0.84; P=.01), the mortality rate was 20% and 29% (OR:0.62; 95% CI: 0.32-1.20; P=.16), and the severe disability rate was 14% (11/80) and 28% (19/67) (OR: 0.40; 95% CI: 0.17-0.92; P=.01). CONCLUSIONS: Selective head cooling combined with mild systemic hypothermia for 72 hours may significantly decrease the combined outcome of severe disability and death, as well as severe disability.
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Hipotermia Inducida/métodos , Hipoxia-Isquemia Encefálica/terapia , China , Femenino , Cabeza , Humanos , Recién Nacido , Masculino , Método Simple CiegoRESUMEN
OBJECTIVES: To understand the value of measuring neonatal cerebral regional oxygen saturation (rSO2) using near infrared spectroscopy (NIRS) in assessing cerebral oxygenation, to establish the normal range of neonatal cerebral rSO2 and to collect data of the changes of cerebral rSO2 under certain disease status. METHODS: Nine large hospitals participated in the multicenter randomized clinical trial from Jan 2007 to Apr 2008. Using the NIRS human tissue oximeter (TSAH-100) independently developed in China, the cerebral rSO2 of 223 normal full-term and 95 otherwise healthy preterm neonates without any special disease, was detected at 1, 2 and 3 days after birth, respectively. The cerebral rSO2 of 102 neonates with diseases which may affect the cerebral oxygenation, was also detected during the severe phases. The pulse oxygen saturation (SpO2) measured at the finger tip, and also the arterial oxygen saturation (SaO2) measured by blood gas analysis, which could indicate the oxygen supply of the whole body, were obtained simultaneously. The correlations among cerebral rSO2, pulse SpO2 and arterial SaO2 were analyzed. RESULTS: (1) The cerebral rSO2 of the normal full-term neonates was (62+/-2)%. Cerebral hypoxia was defined as rSO2 lower than 58%. The cerebral rSO2 of the normal full-terms was steady at 1, 2 and 3 days after birth respectively, without any significant differences among them (F=0.610, P>0.05). The cerebral rSO2 of the neonates with diseases was (55+/-7)%, which was significantly lower than that of the normal full-term neonates (t=15.492, P<0.05). (2) The cerebral rSO2 was positively correlated with the SpO2 (r=0.74, P<0.01) and the SaO2 (r=0.71, P<0.01). (3) Under some special diseases, the changes of cerebral rSO2 was asynchronous with those of the SpO2: (1) For 18 cases under severe cerebral damages or under relatively low hemoglobin concentration, the cerebral rSO2 was significantly low (50%-58%), but the SpO2 was still normal (above 90%). (2) During the recovery of some critically ill neonates, the increase of cerebral rSO2 was lagged as compared with that of pulse SpO2. Especially, during the severe phases of 6 cases with multi-organ failure, the SpO2 and the cerebral rSO2 were both significantly low (55%-80% for SpO2, and 44%-50% for cerebral rSO2); when the diseases were alleviated, although the SpO2 recovered to above 85%, the cerebral rSO2 was still significantly low (around 50%). (3) In 3 cases, during the severe phases of serious hypoxic-ischemic encephalopathy (HIE), the cerebral rSO2 significantly increased to 70%-72%, which was significantly higher than the normal value (62%). CONCLUSIONS: The range of cerebral rSO2 of the normal full-term neonates was (62+/-2)%. Cerebral oxygenation can be externally indicated by the rSO2 noninvasively and continuously measured by NIRS, which was positively correlated with traditional pulse SpO2 and arterial SaO2. In some special diseases, the rSO2 measured by NIRS can be helpful for clinical diagnoses and treatments.
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Encéfalo/metabolismo , Oxígeno/análisis , Espectroscopía Infrarroja Corta , Peso al Nacer , Femenino , Humanos , Hipoxia Encefálica/diagnóstico , Recién Nacido , Masculino , Oximetría/métodosRESUMEN
OBJECTIVE: To compare the newborn piglet models of hypoxic ischemic brain damage in hypoxia and hypoxia combined with occlusion of both carotid arteries. METHODS: Twenty four 7-day-old piglets were divided into two groups. Group H: mechanical ventilation with low concentration of oxygen, Group HI: mechanical ventilation with low concentration of oxygen combined with occlusion of both carotid arteries. The piglets were inhaled with 10%, 8%, and 6% low-concentration oxygen for 30 min, and grouped into mild, moderate, and severe hypoxia ones. The changes of physiological parameter, cerebral blood flow and cerebral oxygen perfusion were detected. RESULTS: There were no significant differences in blood gas analysis of oxygen saturation, blood lactic acid and pH between the two groups(P>0.05).The mean arterial pressure of severe hypoxia in HI was significantly lower than in H (P<0.05). The cerebral blood flow in H and HI was relatively stable after different degrees of hypoxia. As compared with the cerebral blood flow perfusion in group H and HI, there were no significant differences between them(P>0.05). The cerebral oxygen perfusion in H and HI was significantly descent after different degrees of hypoxia(P<0.05). As compared with the cerebral oxygen perfusion in groups H and HI, there were no significant differences between them. CONCLUSION: H and HI have the same effect on physiological parameter, cerebral volume and cerebral oxygen perfusion of newborn piglets. The mechanical ventilation with low concentration of oxygen to newborn piglets can develop the HIBD model, it is not necessary to occlude carotid arteries.
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Modelos Animales de Enfermedad , Hipoxia-Isquemia Encefálica , Hipoxia , Enfermedad Aguda , Animales , Animales Recién Nacidos , Femenino , Masculino , PorcinosRESUMEN
OBJECTIVE: Sponsored by the Subspecialty Group of Neonatology of Pediatric Society, China Medical Association, more than 10 large-scale hospitals participated in the near two-year multicenter investigation for Brain Injuries in Premature Infants in China. The present study presents the follow-up results of 147 premature infants with brain injuries from 6 Third Class A Level hospitals. METHODS: All premature infants with intraventricular hemorrhage (IVH) or periventricular leukomalacia (PVL) diagnosed in the early neonatal period in the 6 hospitals were followed-up between January 2005 and August 2006. Based on the synthetic results of physical development, examination of nervous system, intelligence tests and cranial ultrasound, the premature infants with brain injuries were classified as normal development, marginal development and retarded development. RESULTS: One hundred and forty-seven premature infants with brain injuries from the 6 hospitals consisted of 141 cases of IVH and 36 cases of PVL (30 cases having IVH and PVL). Based on the synthetic follow-up results, 51.4% of premature infants with brain injuries were generally assessed as normal development, 38.4% as marginal development and 10.7% as retarded development. Among them, delayed growth in head circumference, height and weight was 13.4%; the occurrence frequency of cerebral paralysis (CP) was 7.1% in PVL grade I, 28.6% in PVL grade II and 100% in PVL grade III; 12.7% showed retarded development of intelligence; and 30% presented post-injurious changes on cranial sonography. CONCLUSIONS: The data of the multicenter follow-up can basically reflect the short-term prognosis of premature infants with brain injuries in major big cities of China. About 10% of them have retarded physical, motor-and mental developments. The long-term regular follow-up study is expected for more premature infants with brain injuries, and behavioral sequelae of brain injuries which may occur in peri-school age and adolescence should be paid particularly close attention.
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Hemorragia Cerebral/complicaciones , Leucomalacia Periventricular/complicaciones , Hemorragia Cerebral/fisiopatología , Parálisis Cerebral/etiología , Ecoencefalografía , Estudios de Seguimiento , Humanos , Recién Nacido , Recien Nacido Prematuro , Inteligencia , Leucomalacia Periventricular/fisiopatologíaRESUMEN
OBJECTIVE: To study the effect of hyperbaric oxygenation (HBO) on the differentiation of the implanted human neural stem cells (hNSCs) into neurons in neonatal rats following hypoxic-ischemic brain damage (HIBD). METHODS: HIBD model was prepared by ligation of the left common carotid artery, followed by 8% hypoxia exposure in 7-day-old Sprague-Dawley rat pups. Three days later, the rats received implantation of hNSCs into the left cerebral ventricles. Then the survived rats were randomly divided into two groups: transplantation alone and transplantation+HBO (n=8 each). HBO treatment was administered (1.8 ATA, 1 hr once daily for 10 days) in the transplantation+HBO group 1 hr after hNSCs transplantation. Brains were removed 10 days after transplantation. Frozen coronal sections were prepared for immunofluorescence analysis to detect the neural differentiation of the transplanted cells in the cerebral cortex and hippocampus. RESULTS: Differentiated neurons of implanted cells distributed mainly in the cortex and the hippocampus of the injured side. There was no difference in the number of neurons in the cortex between the two groups, while the number of neurons in the hippocampus significantly increased in the transplantation+HBO group compared with that in the transplantation alone group (231.4+15.1 vs 162.6+5.6; P<0.05). CONCLUSIONS: HBO treatment may promote the differentiation of implanted hNSCs into neurons in the hippocampus of neonatal rats following HIBD.
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Oxigenoterapia Hiperbárica , Hipoxia-Isquemia Encefálica/terapia , Neuronas/citología , Trasplante de Células Madre , Animales , Animales Recién Nacidos , Diferenciación Celular , Femenino , Humanos , Masculino , Ratas , Ratas Sprague-DawleyRESUMEN
As a non-invasive technique for measuring tissue oxygenation, near-infrared spectroscopy (NIRS) has increasing applications in detecting cerebral hypoxia-ischemia. The authors, introduced the basic principle of the NIRS oximeter developed independently by our group (TSAH-100). The authors achieved the optimal coupling between the probe and the detected cerebral tissue. The present study investigated different regional oxygen saturations of brain (rSO2) measured non-invasively by NIRS, arterial blood oxygen saturation (SaO2) measured invasively by blood gas analysis and physiological parameters in newborn pigs with different hypoxia, in order to prove if the non-invasively cerebral rSO2 can indicate cerebral oxygenation status in clinical practice. Using this oximeter, cerebral rSO2 of 28 newborn piglets under different oxygenation status was detected. After mechanical ventilation and inhalation of 8%-17% oxygen for 30 min in the newborn pigs, the pigs were grouped according to the inhalation of oxygen. With the inhalation of 13%-17% oxygen was mild hypoxia group, with 10%-13% was moderate hypoxia group, and with 8%-10% was severe hypoxia group. There were 4 animals in mild hypoxia group, 8 animals in moderate hypoxia group, 12 animals in severe hypoxia group and 4 animals were in the normal control group. The physiological parameters were monitored during the experiment. The SaO2 were invasively measured by blood gas analysis after the experiment. The results indicate that both rSO2 and SaO2 decreased after different degree of hypoxia and there was a good correlation between cerebral rSO2 non-invasively measured by NIRS and SaO2 invasively measured by blood gas analysis (p<0.001). Cerebral rSO2 was also consistent with the degree of hypoxia and the changes in physiological parameters after hypoxia. The arterial pH and the mean arterial pressure (MAP) in the severe hypoxia group was lower than that in the control group (p<0.05). The blood lactic acid in the severe hypoxia group was higher than that in the control group (p<0.05). Thus, the rSO2 can accurately and directly indicate cerebral oxygenation status and can also replace the SaO2 invasively measured by blood gas analysis. Cerebral hypoxia-ischemia can be non-invasively and conveniently diagnosed using NIRS.
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Hipoxia-Isquemia Encefálica/diagnóstico , Espectroscopía Infrarroja Corta , Animales , Animales Recién Nacidos , Hipoxia-Isquemia Encefálica/sangre , Oxígeno/sangre , Oxígeno/metabolismo , PorcinosRESUMEN
OBJECTIVE: To study correlation of brain hypoxia of different degrees with brain function and damage. METHODS: The brain regional oxygen saturation (rSO2) was determined by using a non-invasive near infrared spectroscopy (NIRS) technique in 15 piglets; the piglets were subjected to inhale 3% - 11% oxygen-nitrogen mixed gas through mechanical ventilation for 30 min. The piglets were divided into groups according to the level of brain rSO2 (i.e. < 30%, 30% - 35%, 35% - 40%, and 40% - 50%), and the data were compared with those of the control group (rSO2 > 60%). Changes of brain function were detected through amplitude and frequency of EEG waves and signal complexity. The piglets were sacrificed via decapitation 72 h after brain damage, and then histopathological and ultrastructural examinations were performed on cerebral cortex and hippocampal CA1 area. RESULTS: In the group with rSO2 > 40%, the mean arterial pressure (MAP) after hypoxia was (56 +/- 0.00) mm Hg (1 mm Hg = 0.133 kPa), the blood lactic acid (LA) was (2.3 +/- 1.2) mmol/L, the EEG findings were within normal range, and there was no change in brain tissue ultrastructure. In the group with brain rSO2 = 30% approximately 40%, the MAP was (73 +/- 8) mm Hg, the LA was (8.2 +/- 3.9) mmol/L, the EEG waves showed decreased amplitude, frequency and complexity, but restored to some extent after hypoxia. The brain tissue ultrastructure showed damages to the cerebral cortex and neuron mitochondria at hippocampal CA1 area. In the group with brain rSO2 < 30%, the MAP was (35 +/- 0) mm Hg, the LA was (12 +/- 2) mmol/L, the EEG showed decreased amplitude, frequency, and complexity of signals compared with those of the normal control group, and was difficult to restore after hypoxia in some of the piglets; the brain tissue ultrastructure appeared to be similar to the changes seen with high-degree swollen cerebral cortex and neuron mitochondria at hippocampal CA1 area. CONCLUSION: Different degrees of hypoxia had different influence on brain function and brain damage. The lower the brain rSO2, the more severe the damages to the brain and its function. The rSO2 of brain tissues detected with noninvasive NIRS can reflect brain injury and its severity during cerebral anoxia.
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Lesiones Encefálicas/complicaciones , Hipoxia Encefálica/complicaciones , Consumo de Oxígeno , Oxígeno/metabolismo , Espectroscopía Infrarroja Corta/métodos , Animales , Análisis de los Gases de la Sangre , Corteza Cerebral/fisiopatología , Circulación Cerebrovascular/fisiología , Electroencefalografía , Femenino , Hipoxia/metabolismo , Hipoxia/patología , Hipoxia-Isquemia Encefálica/fisiopatología , Masculino , Neuronas/patología , Oximetría/instrumentación , Estadística como Asunto , PorcinosRESUMEN
OBJECTIVE: To compare the differences in cerebral oxygenation responses between the infants born preterm and full-term infants and to evaluate the early cognitive ability of infants born preterm. METHODS: Cerebral oxygenation after light stimulation was detected by near infrared spectroscopy (NIRS) in preterm infants at 3 or 6 months corrected gestational age (GA). The results were compared with those of age-matched infants born at term. RESULTS: The start and peak response time of cerebral oxygenation occurring after light stimulation in preterm infants at 3 months corrected GA was 17.2 +/- 5.2 and 38.4 +/- 9.6 seconds respectively, which were significantly longer than in age-matched term infants (13.1 +/- 2.7 and 28.9 +/- 5.0 seconds respectively) (P < 0.05). The maximum response value of hemoglobin, oxyhemoglobin and regional oxygen saturation of the preterm infants at 3 months corrected GA was (1.2 +/- 0.5)%, (1.5 +/- 0.6)%, and (1.3 +/- 0.4)% respectively , which were significantly lower than that of the term infants [(2.3 +/- 0.3)%, (2.8 +/- 0.3)% and (2.4 +/- 0.5)% respectively] (P < 0.05). Cerebral oxygenation responses to light stimulation in preterm infants examined at 6 months corrected GA were not significantly different from age-matched term infants. CONCLUSIONS: Cerebral oxygenation responses to light stimulation in infants born preterm at 3 months corrected GA are not as good as age-matched term infants, but were close to the level of age-matched term infants at 6 months corrected GA. This suggests that the early cognitive ability of preterm infants before 3 months corrected GA might fall behind age-matched term infants.
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Cognición , Encéfalo/metabolismo , Humanos , Recién Nacido , Recien Nacido Prematuro , Oxígeno/metabolismo , Estimulación Luminosa , Espectroscopía Infrarroja CortaRESUMEN
OBJECTIVE: To study the relationship between early brain response to extrinsic stimulation and neurodevelopment in preterm infants, assess the brain function of preterm infants in the early stage, and thereby to provide objective evidence for the degree of neurodevelopment in preterm infants and to evaluate prognosis. METHODS: Using near infrared spectroscopy (NIRS), the brain response to sound stimulation of 90 preterm infants at different gestational age was observed and compared with the result obtained from 20 full term infants. The neonatal behavioral neurological assessment (NBNA) was performed at corrected age of 40 weeks, and the infants were followed up for 2 years. The effect of gestational age and brain damage on preterm infants, the relation between early brain response in preterm infants and their neurodevelopment was evaluated. RESULTS: All the preterm infants responded to different degrees to auditory stimulation after birth. The time to beginning to react and the time to appearance of the peak reaction were attained after auditory stimulation and the time to beginning to resume when the auditory stimulation was stopped was (278 +/- 94) s, (446 +/- 67) s and (199 +/- 52) s, respectively, which were significantly longer than those observed in the full term infants (107 +/- 30) s, (264 +/- 51) s and (131 +/- 46) s, respectively. The maximum reactions of hemoglobin, oxyhemoglobin and regional oxygen saturation in the infants after gestational age 32 weeks was (0.3 +/- 0.3)%, (0.7 +/- 0.5)% and (0.3 +/- 0.3)%, respectively, which were significantly lower than those in the full term infants (1.7 +/- 0.7)%, (1.7 +/- 0.8)% and (1.6 +/- 0.7)%, respectively. When the brain response of preterm infants was compared with that in infants without brain damage, the speed of the reaction was slow, the maximum reaction was low. The brain response in preterm infant was correlated with NBNA at corrected age of 40 weeks. It was found during the following-up that abnormal neurodevelopment was associated with poor brain reaction. CONCLUSIONS: NIRS can be used to evaluate brain response of infants. Preterm infants display brain response to auditory stimulation. Early brain response is correlated with neurodevelopment.
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Encéfalo/crecimiento & desarrollo , Encéfalo/metabolismo , Recién Nacido/crecimiento & desarrollo , Recién Nacido/metabolismo , Recien Nacido Prematuro/crecimiento & desarrollo , Recien Nacido Prematuro/metabolismo , Espectroscopía Infrarroja Corta , Estimulación Acústica , Factores de Edad , Femenino , Estudios de Seguimiento , Edad Gestacional , Hemoglobinas/metabolismo , Humanos , Lactante , Masculino , Pruebas Neuropsicológicas , Oxígeno/metabolismo , Oxihemoglobinas/metabolismo , Factores de TiempoRESUMEN
OBJECTIVE: To investigate the clinical manifestations, imaging characteristics as well as prognosis of neonatal polycythemia complicated with brain damage. METHODS: One hundred and sixteen in-patients with neonatal polycythemia admitted to our hospital during January 2003 to October 2005 were analyzed. Their clinical manifestations were observed. Craniocerebral ultrasonic examination (2D, 3D), CT and MRI were employed to dynamically observe the craniocerebral imaging variances as well as the cerebral hemodynamic variations and near infrared spectroscopy (NIR) was adopted to test the cerebral oxygenation. Twenty-two cases with moderate or severe disease were followed up for 3 to 12 months. RESULTS: Out of the 116 polycythemic neonates, 53 cases had brain damages, of whom 31 had mild, 14 had moderate, and 8 had severe damages. Cranial imaging alterations were mostly ischemic injuries of various areas of different severity. The severity of brain damage was closely related to the duration of polycythemia, oxygen saturation of cerebral tissues as well as cerebral hemodynamic abnormalities. Brain injury was likely to occur in those whose polycythemia persisted for more than three days. The regional saturation of oxygen (rSO(2)) in mild brain injury cases was found to be 52.1%, while it was 47.1% in moderate and severe brain injury cases. Compared to the 58% as found in non-brain injury cases, the variance was found to be statistically significant (F = 104.466, P < 0.01). Among the cases with brain injury, cerebral hemodynamics displayed a slowdown in the blood flow velocity in the cerebral anterior artery and medium artery during the systolic phase and/or the diastolic phase. The abnormality ratio was closely related to the severity of brain injury. Through the chi(2) test the variance was proved to be statistically highly significant (chi(2) = 18.889, P < 0.01), however it was not correlated with the increase of the initial levels of hemoglobin (Hb) and hematocrit (HCT) (P > 0.05). During the follow up, neurological developmental abnormalities of various severity were found to exist in the cases with moderate (5/12) and severe disease (7/8), while cerebral palsy or epilepsy was not yet found. CONCLUSION: Neonatal polycythemia might tend to bring about a reduction in the perfusion of cerebral blood flow and damaged cerebral oxygenation metabolism which in turn might lead to cerebral ischemic injury, which in some of the moderate and severe cases might lead to long-term neurological complications. Imaging investigations especially craniocerebral ultrasonic examination could be the practical means for the early diagnosis and evaluation of prognosis.
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Daño Encefálico Crónico/complicaciones , Enfermedades del Recién Nacido , Policitemia/complicaciones , Encéfalo/patología , Circulación Cerebrovascular , Femenino , Humanos , Recién Nacido , Imagen por Resonancia Magnética , Masculino , Cráneo/diagnóstico por imagen , Tomógrafos Computarizados por Rayos X , UltrasonografíaRESUMEN
We investigate the optical properties of the brain in 23 neonates in vivo using a frequency domain near-infrared spectroscopy (NIRS). In this study, a calibration procedure is employed to determine the absorption and reduced scattering coefficients with single source-detector separation. The absorption coefficients of the infant foreheads are lower than the values reported in adults. A large intersubject variation in the reduced scattering coefficients is also demonstrated. Furthermore, physiological parameters are derived from the absorption coefficients at two wavelengths (788 and 832 nm). The mean total hemoglobin concentration (THC) is 39.7+/-9.8 microM and the mean cerebral blood oxygen saturation (StO2) is 58.7+/-11.2%. Our preliminary results show that this bedside frequent domain NIRS could provide quantitative optical measurement of the infant brain.
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Encéfalo/efectos de la radiación , Luz , Espectroscopía Infrarroja Corta , Absorción , Humanos , Recién Nacido , Modelos Biológicos , Reproducibilidad de los ResultadosRESUMEN
The absorption andreduced scattering parameters of tissue can provide information on a variety of physiologic processes. In the present paper, the local optical properties of 23 infant foreheads were measured with a two-wavelength (788 and 832 nm) portable frequency-domain NIR spectroscopic techinque, based on a standard reference phantom with known optical properties. The single source-detector separation is 40 mm. The cerebral blood volume and tissue oxygensaturation were also derived from themeasured absorption coefficients.
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Química Encefálica , Espectroscopía Infrarroja Corta/métodos , Encéfalo/irrigación sanguínea , Hemoglobinas/análisis , Humanos , Recién Nacido , Oxígeno/análisis , Flujo Sanguíneo RegionalRESUMEN
OBJECTIVE: To analyze the relationship between clinical characteristics and prognosis of neonatal cerebral infarction and to draw attention to the disease to improve the long-term outcome through early diagnosis and intervention. METHODS: The clinical characteristics of 6 confirmed cases were summarized. Perinatal conditions and other factors were analyzed for possible causes of the disease. The survived patients were followed-up for 6-8 months. RESULTS: The authors diagnosed 6 cases of neonatal cerebral infarction in one year, which accounted for 0.6% (6/969) of all the in-patients in the same time period. Among them 3 cases were confirmed as cerebrovascular malformations by magnetic resonance angiography (MRA), In 1 case the infarction was due to severe bilateral intraventricular hemorrhage, and in another case the disease was related to comprehensive factors such as prematurity, maternal pregnancy induced hypertension and respiratory failure secondary to bronchopulmonary dysplasia (BPD), and in 1 case the cause was undetermined. Four out of the 6 patients presented with varied forms of convulsions, which became the second leading cause for all the neonatal convulsive events (20%). None of the patients had localized neurological signs in the early course except for abnormal muscular tone of some extent. Cerebral ultrasound scanning in 5 out of 6 cases showed positive results. The diffusion-weighted magnetic resonance imaging (DW-MRI) was highly valuable for early confirmative diagnosis. Only one case was found normal within one year of follow-up and all the other 5 cases had unfavorable prognoses of varied severity. CONCLUSION: Neonatal cerebral infarction is not a rare condition and should be considered as one of the important causes for neonatal convulsion. Imaging study is the main technique for diagnosis. The prognoses were poor for those cases for whom early diagnosis and treatment can not be made or those with widespread cerebral lesions.