[Comparison of Doppler indexes to predict small infants for gestational age in pregnant women with hypertensive syndromes]. / Comparação entre os índices doplervelocimétricos na predição de recém-nascidos pequenos para idade gestacional em gestantes com síndromes hipertensivas.

PURPOSE: to determine the best Doppler flow velocimetry index to predict small infants for gestational age (SGAI), in pregnant women with hypertensive syndromes. METHODS: a cross-sectional study was conducted enrolling 129 women with high blood pressure, submitted to doppler velocimetry up to 15 days before delivery. Women with multiple fetuses, fetal malformations, genital bleeding, placental abruption, premature rupture of fetal membranes, smoking, use of illicit drugs, and chronic diseases were excluded. A receiver operating characteristic (ROC) curve for each Doppler variable was constructed to diagnose SGAI and the sensitivity (Se), specificity (Sp), positive (PLR) and negative (NLR) likelihood ratio were calculated. RESULTS: the area under the ROC curve for the middle cerebral artery resistance index was 52% (p=0.79) with Se, Sp, PLR, and NLR of 25.0, 89.1, 2.3 and 0.84% for a resistance index lower than 0.70, respectively. While the area under the ROC curve for the resistance index of the umbilical artery was 74% (p=0.0001), with Se=50.0%, Sp=90.0%, PLR=5.0 and NLR=0.56, for a resistance index higher or equal to 0.70. The area under the ROC curve for the resistance index umbilical artery/middle cerebral artery ratio was 75% (p=0.0001). When it was higher than 0.86, the Se, Sp, PLR and NLR were 70.8, 80.0, 3.4 and 0.36%, respectively. For the resistance index of the middle cerebral artery/uterine artery ratio, the area under the ROC curve was 71% (p=0.0001). We found a Se=52.2%, Sp=85.9%, PLR=3.7 and NLR=0.56, when the ratio was lower than 1.05. When we compared the area under the ROC curve of the four doppler velocimetry indexes, we observed that only the resistance index umbilical artery/middle cerebral artery, resistance index middle cerebral artery/uterine artery and resistance index umbilical artery ratios seem to be useful for the prediction of SGA. CONCLUSION: in patients with high blood pressure during pregnancy, all doppler velocimetry parameters, except the middle cerebral artery resistance index, can be used to predict SGAI. The umbilical artery/middle cerebral artery ratio seems to be the most recommended one.

Comparação entre os índices doplervelocimétricos na predição de recém-nascidos pequenos para idade gestacional em gestantes com síndromes hipertensivas / Comparison of Doppler indexes to predict small infants for gestational age in pregnant women with hypertensive syndromes

OBJETIVO: determinar o melhor parâmetro doplervelocimétrico para predição de recém-nascidos pequenos para a idade gestacional (RNPIG), em gestantes com síndromes hipertensivas. MÉTODOS: realizou-se um estudo transversal, envolvendo 129 mulheres com pressão sanguínea elevada, as quais foram submetidas à doplervelocimetria, até quinze 15 dias antes do parto. Mulheres com gravidez múltipla, malformações fetais, sangramento genital, descolamento prematuro de placenta, rotura prematura das membranas, tabagismo, uso ilícito de drogas e doenças crônicas foram excluídas. A curva ROC para cada parâmetro doplervelocimétrico foi construída para predição de RNPIG. Foram calculadas: a sensibilidade (S), especificidade (E), razão de verossimilhança positiva (RVP) e negativa (RVN). RESULTADOS: a área sob a curva ROC do índice de resistência da artéria cerebral média foi de 52 por cento (p=0,79), com S, E, RVP e RVN de 25,0, 89,1, 2,3 e 0,84 por cento, respectivamente, para um índice de resistência menor que 0,70. Enquanto a área sob a curva ROC para o índice de resistência da artéria umbilical foi 74 por cento (p=0,0001), com S=50,0 por cento, E=90,0 por cento, RVP=5,0, RVN=0,56, para um índice de resistência maior ou igual a 0,70. A área sob a curva ROC para a relação do índice de resistência da artéria umbilical/artéria cerebral média foi 75 por cento (p=0,0001), para uma relação maior que 0,86, a S, E, RVP e RVN foram de 70,8, 80,0, 3,4 e 0,36 por cento, respectivamente. Quanto à relação do índice de resistência da artéria cerebral média/artéria uterina, a área sob a curva ROC foi 71 por cento (p=0,0001), encontrando-se S=52,2 por cento, E=85,9 por cento, RVP=3,7 e RPN=0,56, quando a relação foi menor que 1,05...

PURPOSE: to determine the best Doppler flow velocimetry index to predict small infants for gestational age (SGAI), in pregnant women with hypertensive syndromes. METHODS: a cross-sectional study was conducted enrolling 129 women with high blood pressure, submitted to dopplervelocimetry up to 15 days before delivery. Women with multiple fetuses, fetal malformations, genital bleeding, placental abruption, premature rupture of fetal membranes, smoking, use of illicit drugs, and chronic diseases were excluded. A receiver operating characteristic (ROC) curve for each Doppler variable was constructed to diagnose SGAI and the sensitivity (Se), specificity (Sp), positive (PLR) and negative (NLR) likelihood ratio were calculated. RESULTS: the area under the ROC curve for the middle cerebral artery resistance index was 52 percent (p=0.79) with Se, Sp, PLR, and NLR of 25.0, 89.1, 2.3 and 0.84 percent for a resistance index lower than 0.70, respectively. While the area under the ROC curve for the resistance index of the umbilical artery was 74 percent (p=0.0001), with Se=50.0 percent, Sp=90.0 percent, PLR=5.0 and NLR=0.56, for a resistance index higher or equal to 0.70. The area under the ROC curve for the resistance index umbilical artery/middle cerebral artery ratio was 75 percent (p=0.0001). When it was higher than 0.86, the Se, Sp, PLR and NLR were 70.8, 80.0, 3.4 and 0.36 percent, respectively. For the resistance index of the middle cerebral artery/uterine artery ratio, the area under the ROC curve was 71 percent (p=0.0001). We found a Se=52.2 percent, Sp=85.9 percent, PLR=3.7 and NLR=0.56, when the ratio was lower than 1.05...