RESUMO
OBJETIVOS: Elaborar modelos de predição de peso fetal e de percentis longitudinais de peso fetal estimado (PFE) com uma amostra da população brasileira. MÉTODOS: Estudo observacional prospectivo. Dois grupos de gestantes foram recrutados: Grupo EPF (estimativa de peso fetal): pacientes para elaboração (EPF-El) e validação (EPF-Val) de um modelo de predição de peso fetal; Grupo IRL (intervalos de referência longitudinais): gestantes para elaboração (IRL-El) e validação (IRL-Val) de intervalos de referência longitudinais de PFE. Regressão polinomial foi utilizada com os dados do subgrupo EPF-El para gerar o modelo de predição de peso fetal. O desempenho deste modelo foi comparado com os de outros disponíveis na literatura. Modelos lineares mistos foram usados para elaboração de intervalos longitudinais de PFE com os dados do subgrupo IRL-El. Os dados do subgrupo IRL-Val foram usados para validação destes intervalos. RESULTADOS: Quatrocentos e cinqüenta e oito pacientes compuseram o Grupo EPF (EPF-El: 367; EPF-Val: 91) e 315 o Grupo IRL (IRL-El: 265; IRL-Val: 50). A fórmula para cálculo do PFE foi: PFE=-8,277+2,146xDBPxCAxCF-2,449xCFxDBP². Os desempenhos de outras fórmulas para estimativa de peso fetal em nossa amostra foram significativamente piores do que os do modelo gerado neste estudo. Equações para predição de percentis condicionais de PFE foram derivadas das avaliações longitudinais do subgrupo IRL-El e validadas com os dados do subgrupo IRL-Val. CONCLUSÕES: descrevemos um método para adaptação de intervalos de referência longitudinais de PFE, sendo este obtido por meio de fórmulas geradas em uma amostra da população brasileira.
PURPOSES: To elaborate models for the estimation of fetal weight and longitudinal reference intervals of estimated fetal weight (EFW) using a sample of the Brazilian population. METHODS: Prospective observational study. Two groups of patients were evaluated: Group EFW (estimation of fetal weight): to elaborate (EFW-El) and validate (EFW-Val) a model for the prediction of fetal weight; Group LRI (longitudinal reference intervals): To elaborate (LRI-El) and validate (LRF-Val) conditional (longitudinal) percentiles of EFW. Polynomial regression analysis was applied to the data from subgroup EFW-El to elaborate a model for the estimation of fetal weight. The performance of this model was compared to those of previously published formulas. Linear mixed models were used for the elaboration of longitudinal reference intervals of EFW using data from subgroup LRI-El. Data obtained from subgroup LRI-Val were used to validate these intervals. RESULTS: Group EFW consisted of 458 patients (EFW-El: 367; EFW-Val: 91) and Group LRI consisted of 315 patients (LRI-El: 265; LRI-Val: 50). The model obtained for EFW was: EFW=-8.277+2.146xBPDxACxFL-2.449xFLxBPD². The performances of other models were significantly worse than those obtained with our formula. Equations for the prediction of conditional percentiles of EFW were derived from the longitudinal observation of patients of subgroup LRI-El and validated with data from subgroup LRI-Val. CONCLUSIONS: We described a method for customization of longitudinal reference intervals of EFW obtained using formulas generated from a sample of the Brazilian population.
Assuntos
Adulto , Feminino , Humanos , Gravidez , Peso Fetal , Brasil , Pesos e Medidas Corporais/métodos , Pesos e Medidas Corporais/estatística & dados numéricos , Modelos Estatísticos , Estudos Prospectivos , Valores de ReferênciaRESUMO
OBJECTIVE: To evaluate the demographic characteristics of cases with body stalk anomaly (BSA) and describe the obstetric outcome. METHOD: Retrospective review of a case series of BSA diagnosed from 2000 to 2010. RESULTS: Among the 21 cases, mean gestational age at diagnosis was 22 weeks (range 11-35 weeks). Ten cases elected termination of pregnancy, which was performed at a median gestational age of 24 weeks. One termination of pregnancy at 33 weeks' gestation in a woman with late diagnosis of BSA and a previous uterine scar, required cesarean section during labor because of clinical signs of uterine rupture. Of the remaining 11 cases, four were lost to follow-up, three delivered vaginally, three underwent elective cesarean sections, and one underwent cesarean section because of obstructed labor. Six of seven cases were growth restricted and six of seven were small for gestational age. There were no abnormal karyotypes among the nine cases which underwent cytogenetic studies. CONCLUSION: Continuation of pregnancy in the presence of BSA is associated with greater maternal risks, in the form of labor complications requiring cesarean section. This information should be discussed with couples at the time of diagnosis.
Assuntos
Parede Abdominal/anormalidades , Anormalidades Múltiplas/diagnóstico , Anormalidades Múltiplas/epidemiologia , Feto/anormalidades , Resultado da Gravidez/epidemiologia , Adolescente , Adulto , Cesárea/estatística & dados numéricos , Estudos de Coortes , Feminino , Idade Gestacional , Humanos , Complicações do Trabalho de Parto/diagnóstico , Complicações do Trabalho de Parto/epidemiologia , Complicações do Trabalho de Parto/etiologia , Gravidez , Prognóstico , Estudos Retrospectivos , Ruptura Uterina/epidemiologia , Ruptura Uterina/etiologia , Adulto JovemRESUMO
PURPOSES: To elaborate models for the estimation of fetal weight and longitudinal reference intervals of estimated fetal weight (EFW) using a sample of the Brazilian population. METHODS: Prospective observational study. Two groups of patients were evaluated: Group EFW (estimation of fetal weight): to elaborate (EFW-El) and validate (EFW-Val) a model for the prediction of fetal weight; Group LRI (longitudinal reference intervals): To elaborate (LRI-El) and validate (LRF-Val) conditional (longitudinal) percentiles of EFW. Polynomial regression analysis was applied to the data from subgroup EFW-El to elaborate a model for the estimation of fetal weight. The performance of this model was compared to those of previously published formulas. Linear mixed models were used for the elaboration of longitudinal reference intervals of EFW using data from subgroup LRI-El. Data obtained from subgroup LRI-Val were used to validate these intervals. RESULTS: Group EFW consisted of 458 patients (EFW-El: 367; EFW-Val: 91) and Group LRI consisted of 315 patients (LRI-El: 265; LRI-Val: 50). The model obtained for EFW was: EFW=-8.277+2.146xBPDxACxFL-2.449xFLxBPD². The performances of other models were significantly worse than those obtained with our formula. Equations for the prediction of conditional percentiles of EFW were derived from the longitudinal observation of patients of subgroup LRI-El and validated with data from subgroup LRI-Val. CONCLUSIONS: We described a method for customization of longitudinal reference intervals of EFW obtained using formulas generated from a sample of the Brazilian population.