An observational study in Fetal Cisterna Magna Length and Ultrasonography, sponsored by Hospital Universitario Dr. Jose E. Gonzalez. Completed at 1 site in Mexico. Open to female participants, including healthy volunteers. Per ClinicalTrials.gov, last updated 2019-12-02.
Sponsored by Hospital Universitario Dr. Jose E. Gonzalez · Observational
The aim of this study is to determine the effect of imaging angle on the measurement of fetal cisterna magna (CM) in the second trimester.
Fetal CM will be prospectively measured in women at 18-24.6 weeks' gestation. Measurements will be made on different angles between the transducer and fetal cerebellar axial plane with internal landmarks.
Design: Observative, cross sectional
Patients and methods: women with low risk single pregnancy will be studied. Fetuses with multiple pregnancies, maternal chronic disease and severe congenital anomalies except mega cisterna magna (MCM) will be excluded from the study. Measurements will be performed on the axial cerebellar plane.The anteroposterior measurement will be made between the posterior border of the cerebellar vermis and the internal face of the occipital bone.
The primary outcome variables will be cisterna magna length measured on different angles between the transducer and the axial cerebellar plane of the fetal head.
Cisterna magna length measurement related to fetal presentation and gender will be secondary outcomes.
Hospital Universitario Dr. Jose E. Gonzalez is the lead sponsor of 79 studies on the registry; 11 are open to participants now.
Counted across the registry records on this site, refreshed daily.
Women with low risk pregnancy between the 18th and 24th weeks with confirm gestational age who wil be referred to our prenatal diagnosis unit for ultrasonography to be performed in their second trimester.
Exclusion Criteria:
The length measurement on the fetal cisterna magna (CM) with an angle of 0° between the transducer and the axial cerebellar plane of the fetal head (midline structures will be perpendicular to the ultrasound beam). After that, CM will be measured again after moving the transducer approximately 30° towards the fetal occiput. Measurements will be performed on the axial cerebellar plane using internal landmarks including the cavum septi pellucidi, thalamus, third ventricle, cerebral peduncles and cerebellar hemispheres.The anteroposterior measurement will be made between the posterior border of the cerebellar vermis and the internal face of the occipital bone. All the ultrasonography examinations were performed abdominally, using 3-5 megahertz (MHz) transducers.
Cisterna Magna length
The length measurement on the CM with an angle of 0° between the transducer and the axial cerebellar plane of the fetal head (midline structures will be perpendicular to the ultrasound beam). After that, CM will be measured again after moving the transducer approximately 30° towards the fetal occiput. Measurements of the anteroposterior diameter Will be obtained along straight lines between the posterior border of the cerebellar vermis and the internal face of the occipital bone.
Time frame: 24 hours
Cisterna Magna length according to fetal presentation
The length measurement on the CM with an angle of 0° between the transducer and the axial cerebellar plane of the fetal head (midline structures will be perpendicular to the ultrasound beam). After that, CM will be measured again after moving the transducer approximately 30° towards the fetal occiput. Measurements will be made in fetuses with cephalic and breech presentation. Another measurement will be made in fetuses with cephalic presentation that had converted to breech presentation or viceversa in less than 24 hours.
Time frame: 24 hours
Cisterna Magna length according to fetal sex
The length measurement on the cisterna magna (CM) with an angle of 0° between the transducer and the axial cerebellar plane of the fetal head (midline structures will be perpendicular to the ultrasound beam). After that, CM will be measured again after moving the transducer approximately 30° towards the fetal occiput. Those measurements will be compare between male and female fetuses.
Time frame: 24 hours
Plan to share: No
This study is completed, as verified in Oct 2019. You cannot join it, but the record below documents what was studied.
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Hospital Universitario Dr. Jose E. Gonzalez