Journal of Obstetric Anaesthesia and Critical Care

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

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




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;10:152-152


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 ];10:152-152
Available from: https://www.joacc.com/text.asp?2020/10/2/152/292730


Full Text



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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Conflicts of interest

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References

1Bala 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.
2Luberda M, Stachura K, Moskała M. Optic nerve sonography - The non-invasive evaluation of intracranial pressure. Przegl Lek 2013;70:983-5.
3Maude 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.
4Anas I. Transorbital sonographic measurement of normal optic sheath nerve diameter in nigerian adult population. Malays J Med Sci 2014;21:24-9.
5Chen 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.