Influence of Imaging Angle in Measurement of Cisterna Magna

Ultrasonography Clinical Trial

Official title:

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

Clinical Trial Details — Status: Completed

Administrative data

• NCT number: NCT03697902
• Other study ID #: GI19-00010
• Status: Completed
• Start date: October 15, 2018
• Est. completion date: October 28, 2019

Study information

• Verified date: October 2019
• Source: Hospital Universitario Dr. Jose E. Gonzalez
• Contact: n/a
• Is FDA regulated: No
• Study type: Observational

Clinical Trial 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

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.

Recruitment information / eligibility

• Status: Completed
• Enrollment: 94
• Est. completion date: October 28, 2019
• Est. primary completion date: October 28, 2019
• Accepts healthy volunteers: Accepts Healthy Volunteers
• Gender: Female
• Age group: N/A and older

Eligibility

Inclusion Criteria:

• Pregnant women between the 18th and 24th weeks.

• Confirmed gestational age by regular menstrual cycle or determined from crown- rump length at first trimester ultrasonography for those with unknown menstruation date .

Exclusion Criteria:

• Uncertain gestational age

• Twin or multiple pregnancy.

• Increased risk for aneuploidy determined by first trimester screening.

• Absence of intracranial translucency in first trimester ultrasound examination.

• Fetal malformations identified EXCEPT megacisterna magna.

• Karyotype anomaly.

• Chronic maternal diseases such as arterial hypertension, diabetes mellitus, hypothyroidism and hyperthyroidism.

• Failure to obtain accurate measurement for technical reasons.

Related Conditions & MeSH terms

• Fetal Cisterna Magna Length
• Ultrasonography

Intervention

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.

Locations

Country	Name	City	State
Mexico	Hospital Universitario Dr. José Eleuterio González	Monterrey	Nuevo León

Sponsors (1)

Lead Sponsor	Collaborator
Hospital Universitario Dr. Jose E. Gonzalez

Country where clinical trial is conducted

Mexico, 

References & Publications (4)

Araujo Júnior E, Martins WP, Rolo LC, Pires CR, Zanforlin Filho SM. Normative data for fetal cisterna magna length measurement between 18 and 24 weeks of pregnancy. Childs Nerv Syst. 2014 Jan;30(1):9-12. — View Citation

Cho JY, Kim KW, Lee YH, Toi A. Measurement of nuchal skin fold thickness in the second trimester: influence of imaging angle and fetal presentation. Ultrasound Obstet Gynecol. 2005 Mar;25(3):253-7. — View Citation

Liu Z, Han J, Fu F, Liu J, Li R, Yang X, Pan M, Zhen L, Li D, Liao C. Outcome of isolated enlarged cisterna magna identified in utero: experience at a single medical center in mainland China. Prenat Diagn. 2017 Jun;37(6):575-582. doi: 10.1002/pd.5046. Epub 2017 May 10. — View Citation

Serhatlioglu S, Kocakoc E, Kiris A, Sapmaz E, Boztosun Y, Bozgeyik Z. Sonographic measurement of the fetal cerebellum, cisterna magna, and cavum septum pellucidum in normal fetuses in the second and third trimesters of pregnancy. J Clin Ultrasound. 2003 May;31(4):194-200. — View Citation

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	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.	24 hours
Secondary	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.	24 hours
Secondary	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.	24 hours