Resistance index of the umbilical arteries and fetal brain in normal pregnancies average 20 to 40 weeks.

• Autores: Huamán, Moisés, Zapata, Josué
• Formato: artículo
• Fecha de Publicación: 2015
• Institución: Sociedad Peruana de Obstetricia y Ginecología
• Repositorio: Revista SPOG - Revista Peruana de Ginecología y Obstetricia
• Lenguaje: español
• OAI Identifier: oai:ojs.spog:article/1404
• Enlace del recurso: http://www.spog.org.pe/web/revista/index.php/RPGO/article/view/1404
• Nivel de acceso: acceso abierto

OBJECTIVE: To determine the resistance index (RI) of umbilical artery and fetal middle cerebral artery in normal patients enrolled in the second half of pregnancy. DESIGN: Prospective study of pregnant women without complications from 20 weeks to term. MATERIALS AND METHODS: 125 patients with no risk factors were selected. The resistance index was evaluated in the umbilical artery and middle cerebral artery using equipment Logiq 500 MD / MR 3 GE. RESULTS: IR umbilical artery at 20 weeks is about 0,750; then decreases steadily, faster between 26 and 34 weeks and at the end of gestation, it is less than 0,600. The IR fetal middle cerebral artery of a mean value close to 0,900 at 20 weeks, showing a rapid decline up to 24 weeks and then maintain a slow and gradual decline until the end, with around 0,700. CONCLUSION: During the second half of pregnancy flow resistance measured by IR fetal middle cerebral artery, is greater than the umbilical artery, usually with a ratio greater than one.