NCT03697902

Influence of Imaging Angle in Measurement of Cisterna Magna

Influence of Imaging Angle in Measurement of Cisterna Magna in the Second Trimester

• Status: Completed
• Phase: —
• Study type: Observational
• Enrollment: 94 (actual)
• Sponsor: Hospital Universitario Dr. Jose E. Gonzalez · Academic / Other
• Sex: Female
• Age: —
• Healthy volunteers: Accepted

Summary

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

Detailed description

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.

Conditions

• Fetal Cisterna Magna Length
• Ultrasonography

Interventions

Type	Name	Description
DIAGNOSTIC_TEST	Ultrasonographic Measurement on Fetal cisterna magna length	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.

Timeline

• Start date: 2018-10-15
• Primary completion: 2019-10-28
• Completion: 2019-10-28
• First posted: 2018-10-05
• Last updated: 2019-12-02

Locations

1 site across 1 country: Mexico