Optic nerve sheath diameter measured using ocular sonography is raised in patients with eclampsia

Mahmood Dhahir Al-Mendalawi

doi:10.4103/joacc.JOACC_16_20

LETTERS TO EDITOR

Year : 2020 | Volume : 10 | Issue : 2 | Page : 152

Optic nerve sheath diameter measured using ocular sonography is raised in patients with eclampsia

Mahmood Dhahir Al-Mendalawi
Department of Paediatrics, Al-Kindy College of Medicine, University of Baghdad, Baghdad, Iraq

Date of Submission	01-Mar-2020
Date of Acceptance	03-Jul-2020
Date of Web Publication	20-Aug-2020

Correspondence Address:
Prof. Mahmood Dhahir Al-Mendalawi
P.O. Box 55302, Baghdad Post Office, Baghdad
Iraq

Source of Support: None, Conflict of Interest: None

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DOI: 10.4103/joacc.JOACC_16_20

How to cite this article:
Al-Mendalawi MD. Optic nerve sheath diameter measured using ocular sonography is raised in patients with eclampsia. J Obstet Anaesth Crit Care 2020;10:152

How to cite this URL:
Al-Mendalawi MD. Optic nerve sheath diameter measured using ocular sonography is raised in patients with eclampsia. J Obstet Anaesth Crit Care [serial online] 2020 [cited 2020 Oct 28];10:152. Available from: https://www.joacc.com/text.asp?2020/10/2/152/292730

Sir,

It is my pleasure to comment on the interesting study by Balaet al.^[1] published in July- December 2019 issue of the Journal of Obstetric Anaesthesia and Critical Care. Based on the transorbital ultrasound, the authors studied the difference between optic nerve sheath diameter (ONSD) in eclampsia versus noneclamptic Indian parturients admitted to the intensive care unit. They found ONSD was higher in patients with eclampsia suggesting increased intracranial pressure (ICP), and with subsidence of disease process it decreased.^[1] The authors mentioned few study limitations. I assume that the following methodological limitation is additionally contributory. It is explicit that the proper transorbital sonographic evaluation of ICP necessitates the employment of optic nerve growth curve from normal ONSD values and age-appropriate cutoff values of ONSD to be utilized in the diagnosis of raised ICP.^[2] Due to ethic variations in the dimensions of various ocular structures, various populations- specific ONSD curves and cut-off values have been generated to be utilized in researches institutions and clinical fields.^[3],[4],[5] Balaet al.^[1] regrettably didn't address exactly which ONSD curves and cut-off values were employed in the study methodology. Consequently, that limitation might question the correctness of the study findings.

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There are no conflicts of interest.

References

1.	Bala R, Banerjee A, Taxak S, Kumar R. Optic nerve sheath diameter measured using ocular sonography is raised in patients with eclampsia. J Obstet Anaesth Crit Care 2019;9:65-9. [Full text]
2.	Luberda M, Stachura K, Moskała M. Optic nerve sonography - The non-invasive evaluation of intracranial pressure. Przegl Lek 2013;70:983-5.
3.	Maude RR, Hossain MA, Hassan MU, Osbourne S, Sayeed KL, Karim MR, et al. Transorbital sonographic evaluation of normal optic nerve sheath diameter in healthy volunteers in Bangladesh. PLoS One 2013;8:e81013.
4.	Anas I. Transorbital sonographic measurement of normal optic sheath nerve diameter in nigerian adult population. Malays J Med Sci 2014;21:24-9.
5.	Chen H, Ding GS, Zhao YC, Yu RG, Zhou JX. Ultrasound measurement of optic nerve diameter and optic nerve sheath diameter in healthy Chinese adults. BMC Neurol 2015;15:106.

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