Imagenologia en embarazo normal
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Transcript of Imagenologia en embarazo normal
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EMBARAZO NORMAL El huevo es fecuandado cerca del extremo
distal de la trompa, el cigoto se divide. A los 3 días después de la fecundación hay
una colonia de 16 células: MORULA Día 4 llega a la cavidad endometrial y se
divide en TROFOBLASTO (membrana coriónica y porción fetal de placenta) y la masa celular más interna EMBRIOBLASTO (embrión, amnios, cordón y saco vitelino) BLASTOCISTO
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EMBARAZO NORMAL
BLASTOCISTO: embrión, al 6to día de fecundación se produce la adherencia al endometrio y la implantación.
El TROFOBLASTO se diferencia en una masa celular interna y en un sincitiotrofoblasto exrerno (penetra a epitelio endometrial).
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Cronología del desarrollo embrionario
Día 14 : FECUNDACIÓN Día 18: Mórula (12-16 células) llega al
útero. Día 20: implantación. Día 23: formación del SV primario. Día 28: formación del SV secundario
(3mm)
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Cronología del desarrollo embrionario SISTEMA CARDIOVASCULAR:
Semana 5 : formación de tubos cardíacos. Comienzo del latido al final de la semana.
Semana 8 : corazón en su forma definitiva.
Semana 10: sistema vascular periférico
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Cronología del desarrollo embrionario APARATO DIGESTIVO: Semana 6 : formación del asa primaria. Semana 8-12 : herniación del intestino
medio en la base del cordón umbilical. Semana 8 : separación del recto del seno
urogenital. Semana 10 : perforación de la membrana
anal.
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Cronología del desarrollo embrionario RIÑONES:
Semana 6 : ascensión de los riñones primitivos (metanefros) desde la pelvis
Semana 11 : riñones en posición adulta.
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Cronología del desarrollo embrionario GENITALES:
Semana 10 : genitales externos asexuados.
Semana 14 : genitales externos fetales maduros.
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Cronología del desarrollo embrionario SISTEMA NERVIOSO CENTRAL:
Semana 6 : formación de vesículas cerebrales primarias.
Semana 9 : identificación de ventrículos tercero y laterales.
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Cronología del desarrollo embrionario EXTREMIDADES:
Semana 5 : formación de esbozos de los miembros.
Semana 9 : miembros superiores-curvatura en el codo, dedos identificables.
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EMBARAZO NORMAL Para el día 10 la implantación es completa. Para el día 14 se puede visualizar el saco
vitelino por ultrasonido. PRIMER TRIMESTRE: SACO GESTACIONAL (4.5 semanas)
SACO VITELINO (5.7 semanas de 8 mm)
EMBRION (6.7 semanas de 16 mm) ACTIVIDAD CARDIACA (6.2 semanas CRL= 5 mm)
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EMBARAZO NORMAL El saco vitelino secundario es posible verlo a
la 5ta semana por US vía endovaginal y 6.5 semanas vía suprapúbica.
El SACO VITELINO tiene función nutricional (3-4 semana), relacionado con la hematopoyesis (5 a 8 semana).
Porción dorsal del SV forma parte del intestino primitivo.
Las células germinales (papel en reproducción)
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EMBARAZO NORMAL
Actividad cardíaca fetal visible a las 6 semanas vía endovaginal y a las 7 vía pélvica, (el corazón empieza a latir entre la 5 a 6 semana) a veces se ve entre la 3-4 semana.
En ocasiones se puede ver el feto con claridad sin detectarse actividad cardiaca, esto se considera normal y se tiene que repetir el estudio dos semanas después para valorar vitalidad y contenido del saco gestacional.
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Primer trimestre
EDAD FETAL: semana 5 a la 8.5: diámetro del SG.
semana 5 a la 12: longitud craneocaudal del feto.
semana 12 el diámetro biparietal (DBP), con la perímetro céfalica (CC).
semana 13 se mide la longitud femoral (LF).
semana 15 perímetro abdominal (CA)
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PRIMER MES
SEGUNDO MES
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TERCER MES
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QUINTO MES
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MAL PRONOSTICO
SACO GESTACIONAL:
TAMAÑO DEL SACO GESTACIONAL
DEFORMACION DEL SACO GESTACIONAL
POSICIÓN BAJA DE LA CAVIDAD ENDOMETRIAL.
SE SUGIERE REALIZAR ESTUDIO POSTERIOR EN DOS SEMANAS PARA VALORAR CONTENIDO Y VITALIDAD
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CRONOLOGIA ECOGRAFICA DE LA GESTACION 4ta a 5ta Semana: a partir de FUR
aparición del Saco Gestacional (SG). 6ta Semana: aparición de la placa fetal 7ma Semana: aparición del latido
cardíaco. 8va Semana: movimientos embrionarios,
visualización del saco vitelino y esbozo de partes pequeñas.
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CRONOLOGIA ECOGRAFICA DE LA GESTACION 9na Semana: desplazamiento de la
vesícula vitelina. Alargamiento de la placa fetal.
10ma Semana: crecimiento del embrión ocupando la tercera parte del SG. Aparición de movimientos activos.
11ma Semana: desaparición del SG e iniciación del esbozo cefálico.
12ma. Semana: aparición de la calota fetal.
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Grano de café
Signo de Tortuga
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PLACENTA Y CORDON
PLACENTA :
se forma de la capa de células más externas de trofoblasto, el sincitiotrofoblasto invade el endometrio y este da lugar a donde se implanta en cigoto.
La Placenta puede verse a las 9 semanas e identificarse siempre a las 12 semanas.
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PLACENTA Y CORDON
CORDON UMBILICAL:
Se compone de dos arterias que llevan sangre del feto a la placenta y una única vena que conduce la sangre de la placenta al feto.
el cordón debe de ser rizado.
se debe de examinar con doppler color.
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GRADOS PLACENTARIOS
Grado 0. placenta homogénea. Grado I. pequeñas calcificaciones
intraplacentarias. Grado II. Calcificaciones en la base de la
placenta. Grado III. Septos que atraviesan la
placenta, separada por cotiledones, con calcificaciones y lagos vasculares (hipoecogénicos).
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EMBARAZO ECTOPICO
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EMBARAZO ECTOPICO
Huevo fecundado o cigoto no desciende por la trompa hasta útero.
FACTORES DE RIESGO: embarzo ectópico previo, antecedente o
EPI, cirugía previa, infertilidad, problemas tubáricos que producen obsterucción, causa más importante
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