Intra and Interobserver Variability in the B-mode Transorbital Sonographic Measurement of the Optic Nerve Sheath Diameter in Healthy Nepalese Individuals

Keywords: Intracranial Hypertension, Interobserver, Intraclass

Abstract

Introduction: Ocular ultrasound has gained importance as a non-invasive imaging technique in the screening, diagnosis and treatment management of intracranial hypertension. The aim of our study was to estimate the intra and interobserver variability on B-mode ocular ultrasound measurement of optic nerve sheath diameter (ONSD).

Methods: ONSD of the right eye was measured by ultrasound examination among 120 healthy adult volunteers. The ONSD was assessed 3 mm behind the globe and two serial measurements were taken by two observers who were blinded to each other’s findings.

Results: Age of the volunteers ranged from 18 to 27 years with a mean age of 23.07 +/- SD of 2.486. The mean of ONSDs of two observers was 4.168 +/- SD of 0.54 mm. The intraclass correlation coefficient for first and second observers was 0.997 and 0.978 respectively at 95% confidence interval. The interobserver intraclass correlation coefficient was 0.977 at 95% confidence interval. No correlation of age and gender was noted with ONSD.

Conclusions: B-mode transorbital ultrasound measurement of ONSD is highly reproducible with significant intra-observer and inter-observer agreement. Ultrasound measurement of ONSD measurements can serve as indispensable tool in critical care.

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Author Biographies

Prasanna Ghimire, Nepalgunj Medical College and Teaching Hospital Kohalpur, Banke, Nepal

Assistant Professor, Department of Radiology

Birendra Bahadur Chand, Bheri Hospital, Banke, Nepal

Chief Consultant Radiologist, Department of Radiology

Yug Bijay Mahat, Nepalgunj Medical College and Teaching Hospital Kohalpur, Banke, Nepal

Radiology resident, Department of Radiology

Subash Ojha, Nepalgunj Medical College and Teaching Hospital Kohalpur, Banke, Nepal

Radiology Resident, Department of Radiology

Bhuwaneshwar Prasad Singh, Nepalgunj Medical College and Teaching Hospital Kohalpur, Banke, Nepal

Professor, Department of Radiology

Published
2019-07-13
How to Cite
Ghimire, P., Chand, B., Mahat, Y., Ojha, S., & Singh, B. (2019). Intra and Interobserver Variability in the B-mode Transorbital Sonographic Measurement of the Optic Nerve Sheath Diameter in Healthy Nepalese Individuals. Nepalese Journal of Radiology, 9(1), 18-23. https://doi.org/10.3126/njr.v9i1.24811
Section
Original Articles