Velocimetria Doppler no período neonatal em recém-nascidos a termo pequenos para idade gestacional

Muniz, Iracema Augusta Carvalho Cortez; Netto, Abimael Aranha; Gonçalves, Vanda Maria Gimenes

doi:10.1590/s0004-282x2003000500020

Cited by 10 publications

(4 citation statements)

References 30 publications

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“…The CBFV in term healthy newborns increased with increasing gestational age, postnatal age and birthweight, and the RI increased significantly with increasing gestational age [6][7][8] . However, limited information is available regarding influence of other factors such as type of delivery, sex, postnatal age and feeding on CBFV, RI and pulsatitility index (PI) in neonates.…”

mentioning

confidence: 99%

Color doppler evaluation of the influence of type of delivery, sex, postnatal age and time post feeding on full term healthy newborns cerebral blood flow

Aranha

Lederman

Segre

2009

Arq. Neuro-Psiquiatr.

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-Objective: The purpose of this study was to evaluate with Color Doppler the influence of type of delivery, sex, postnatal age and time post feeding on full term healthy newborns cerebral blood flow. Method: 50 newborns were studied. The Doppler parameters, peak-systolic velocity, end-diastolic velocity, mean velocity, pulsatility index and resistance index, were measured in the anterior cerebral artery, middle cerebral artery, posterior cerebral artery, and basilar artery. The data were compared and analyzed by statistical tests. Informed consent was obtained from all parents, and the study was approved by institutional ethical committee and review board. Results: We observed not statistically significant differences on cerebral blood flow Doppler parameters in relation to type of delivery, sex, postnatal age and feeding in full term healthy newborns. Conclusion: We believe that the knowledge of these cerebral hemodynamic profile of newborns in the first days of life can contribute in an accurate interpretation of cranial Doppler abnormal findings when pathologic flow velocities are analyzed.KEY WORDS: color Doppler, ultrasonography, cerebral arteries, newborn, blood flow velocity, delivery, sex postnatal age, time post feeding. Doppler colorido na avaliação da influência do tipo de parto, sexo, idade pós-natal e tempo pós-mamada no fluxo sanguíneo cerebral em recém-nascidos a termo e saudáveis resumo -Objetivo: O objetivo deste estudo foi avaliar com Doppler colorido a influência do tipo de parto, sexo, idade pós-natal e tempo pós-mamada no fluxo sanguíneo cerebral de recém-nascidos a termo e saudáveis. Método: Foram estudados 50 recém-nascidos. A Dopplervelocimetria foi obtida nas artérias cerebral anterior, cerebral média, cerebral posterior e basilar. Os parâmetros foram comparados e analisados pelos testes estatísticos Esta pesquisa foi aprovada pela comissão ética e de pós-graduação das instituições e o consentimento informado dos pais foi obtido em todos os casos. Resultados: Não observamos diferenças estatísticamente significativas na Dopplervelocimetria do fluxo sanguíneo cerebral em relação ao tipo de parto, sexo, idade pós-natal e tempo pós-mamada dos recém-nascidos normais e saudáveis estudados. Conclusão: Acreditamos que o conhecimento deste perfil hemodinâmico do fluxo sanguíneo cerebral de recém-nascidos nos primeiros dias de vida possa contribuir para uma acurada interpretação dos achados do Doppler cerebral quando alterações patológicas de velocidade do fluxo sanguíneo forem analisadas.

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mentioning

confidence: 99%

Color doppler evaluation of the influence of type of delivery, sex, postnatal age and time post feeding on full term healthy newborns cerebral blood flow

Aranha

Lederman

Segre

2009

Arq. Neuro-Psiquiatr.

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“…Muniz et al 27 found a reduction in CBF (increase in RI), whereas Scherjon et al 28 and Madazili et al 29 detected an increase in CBF levels (decrease in RI), or no correlation in the study by Martinussen et al 30 in small-for-gestational-age newborns. In the present study, no difference was noted as to the outcome in the three RI groups when stratified by birth weight < and > 1,500 grams.…”

Section: Discussionmentioning

confidence: 94%

“…Several factors have been described to influence CBF and RI, including patent ductus arteriosus, pneumothorax, hyperviscosity, respiratory distress syndrome, birth weight, postnatal age and gestational age among the most important ones. 13,20,23,27 On the other hand, birth weight is influenced by different factors, such as previous maternal and gestational diseases, use of drugs during pregnancy, and gestational age. The combination of these different factors acting on RI and on birth weight may be responsible for the differences observed between the studies.…”

Section: Discussionmentioning

confidence: 99%

Medidas do índice de resistência ao Doppler craniano em recém-nascidos pré-termo com lesão da substância branca cerebral

Argollo¹,

Lessa²,

Ribeiro³

2006

J. Pediatr. (Rio J.)

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Objective: To investigate whether the resistance index (RI) within the first 72 hours of life of newborn infants with cerebral white matter lesion (WML) is correlated with the adverse outcome of WML.Methods: Retrospective study. Newborn infants with WML were identified based on cranial ultrasound results, and those with Doppler imaging and RI measurement were selected. The newborn infants were placed in three groups: low (< 0.61), normal (0.61-0.85) or high (> 0.85) RI. The sample was analyzed as a whole at first and then stratified according to birth weight.Results: According to the RI, cerebral blood flow was abnormal in 46 (68.7%) patients, low in 42 (62.7%), and high in four (6%). Among those with a low RI, 15 (35.7%) had an adverse outcome, with ultrasonographic signs of cerebral atrophy in 10 (23.8%) and intraventricular hemorrhage in five (11.9%) patients. The four newborn infants with a high RI also had an adverse outcome, one (25%) with signs of cerebral atrophy and three (75%) with intraventricular hemorrhage. No statistically significant differences were observed between RI groups and the group with a fatal outcome. Conclusion:The study showed that abnormal RI within the first 72 hours was associated with healing complications in newborn infants with cerebral WML. Abnormal RI results were not correlated with the fatal outcome. Therefore, RI is an important parameter that should be measured in newborn infants. Cranial Doppler resistance index measurement in preterm newborns with cerebral white matter lesion

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“…Neste contexto, os métodos de imagem têm sido utilizados nas avaliações das alterações morfológicas no sistema nervoso central (SNC) e das modifi cações no fl uxo sangüíneo cerebral (FSC) 5,6 . Em relação ao FSC de RN, os mecanismos de auto-regulação vascular cerebral do RN a termo são mais amadurecidos em relação ao prematuro, porém sensíveis a condições de hipóxia.…”

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Relação entre índice de resistência obtido pela ultra-sonografia Doppler transfortanela e o neurodesenvolvimento até o primeiro ano de vida em recém-nascidos a termo com encefalopatia hipóxico-isquêmica leve e moderada

arcia

Monteiro

Freire

2007

Arq. Neuro-Psiquiatr.

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RESUMO -Objetivo: Avaliar a relação do índice de resistência (IR) obtido pela ultra-sonografia Doppler transfontanela com o neurodesenvolvimento até um ano de idade, em recém-nascidos (RN) a termo com encefalopatia hipóxica-isquêmica (EHI) leve a moderada, secundária à asfixia intra-parto. Método: Estudo prospectivo em 20 RN com EHI leve a moderada, IR elevado no primeiro exame de Doppler, e sem doenças associadas ou anormalidades morfológicas cerebrais. Foram realizados exames seriados bimensais de Doppler transfontanela a partir do sétimo dia de vida, e avaliações clínicas mensais do neurodesenvolvimento no primeiro ano de vida. Resultados: Houve normalização progressiva dos valores de IR até o último exame realizado. Cinco pacientes apresentaram normalização clínico-neurológica no período neonatal, após o primeiro exame de Doppler. Quinze lactentes apresentaram alterações neurológicas com resolução a partir do segundo trimestre de vida. Conclusão: Houve relação entre os períodos em que ocorreu a normalização dos valores de IR e a melhora clínica-neurológica. PALAVRAS-CHAVE: encefalopatia hipóxica-isquêmica, ultra-sonografia Doppler, recém-nascido, neurodesenvolvimento.Relation between the resistance index obtained by the transfontanellar Doppler ultrasonography and the neurological development until the first year of life in term infants with mild or moderate hypoxic-ischaemic encephalopathy ABSTRACT -Objective: To evaluate the relation between the resistance index (RI) obtained by transfontanellar Doppler ultrasonography, and the neurodevelopment until one year of life, at term newborns with mild or moderate hypoxic-ischaemic encephalopathy due to intrapartum asphyxia. Method: 20 term newborns, with mild or moderate hypoxic-ischemic encephalopathy, high values of resistance index in the first exam, and without cerebral morfologic abnormalities or other diseases. They were submitted to serial bimonthly transfontanellar Doppler ultrasonography, from the seventh day of life on, and monthly clinical neurodevelopment assessment until one year of life. Results: There was a progressive normalization of RI values until the last examination. In five cases there were clinical neurologic normalization in the neonatal period after the first Doppler exam. Fifteen infants presented neurologic abnormalities, with normalization after the second trimester of life. Conclusion: There was a relation between the normal RI values with the normalization of the clinical assessment.

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Velocimetria Doppler no período neonatal em recém-nascidos a termo pequenos para idade gestacional

Cited by 10 publications

References 30 publications

Color doppler evaluation of the influence of type of delivery, sex, postnatal age and time post feeding on full term healthy newborns cerebral blood flow

Color doppler evaluation of the influence of type of delivery, sex, postnatal age and time post feeding on full term healthy newborns cerebral blood flow

Medidas do índice de resistência ao Doppler craniano em recém-nascidos pré-termo com lesão da substância branca cerebral

Relação entre índice de resistência obtido pela ultra-sonografia Doppler transfortanela e o neurodesenvolvimento até o primeiro ano de vida em recém-nascidos a termo com encefalopatia hipóxico-isquêmica leve e moderada

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