Optic nerve sheath diameter measurement using bedside ultrasound: Is it accurate?

Govil, Deepak; Srinivasan, Shrikanth

doi:10.4103/0972-5229.162456

Cited by 5 publications

(5 citation statements)

References 15 publications

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“…19,20 The diameter of ONSD has been found to be between 3.7 mm and 5.0 mm in healthy individuals. 21,22 In our study, the ONSD diameter was as 4.1±0.4 mm in healthy controls, comparable to that found in previous studies. In studies related to increased ONSD due to ICP, an upper limit of 4.8 mm and 5.9 mm has been found to have a sensitivity of 74% and 96% and specificity of 74 and 100%, respectively for raised ICP.…”

Section: Discussionsupporting

confidence: 91%

Is increased intracranial pressure a reason for headache in COVID-19 patients? Evaluation with optic nerve sheath diameter

simsek¹,

Guzeldag²,

Ertas³

et al. 2022

NeuroAsia

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Objective: Headache occurs in 10-15% of COVID-19 patients. The optic nerve sheath diameter (ONSD) is an indirect measurement of the intracranial pressure (ICP). This study aimed to determine whether there was a relationship between ICP and headache in COVID-19 patients by measuring the ONSD. Methods: The study included a total of 91 people: 68 COVID-19 patients and 23 healthy volunteers as a control group. The two groups were first compared in terms of the ONSD using the ultrasonography (US) technique. Second, the severity of headache in the COVID-19 group was numerically evaluated (from 0 to 10) and the group was then divided into low, moderate, and high subgroups according to headache severity. Afterwards, the ONSD measurements of participants in the COVID-19 group were compared in between the subgroups. Results: We found that the COVID-19 patients had higher ONSD levels than healthy controls (4.7±0.7 mm vs. 4.1±0.4 mm, p <0.001). In the COVID-19 patients, there was a significant difference of ONSD levels between the low and moderate as well as the low and high groups. However, no significant difference was observed between the moderate and high groups. There was also a positive correlation between the headache intensity and ONSD diameter level (p=0.01 r=0.39). Conclusion: COVID-19 patients with headache had higher ONSD levels than healthy volunteers, consistent with increased intracranial pressure. The latter may be one of the causes of headache in COVID-19.

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Section: Discussionsupporting

confidence: 91%

Is increased intracranial pressure a reason for headache in COVID-19 patients? Evaluation with optic nerve sheath diameter

simsek¹,

Guzeldag²,

Ertas³

et al. 2022

NeuroAsia

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“…A cut-off value of 5.61 mm or higher for ONSD had a sensitivity of 86.5% and a specificity of 78.9% for identifying provoked seizures. 18 , 19 This suggests that a higher value for ONSD increases the likelihood of provoked seizures and can aid in the differential diagnosis for emergency physicians.…”

Section: Discussionmentioning

confidence: 99%

“…The severity and associated risks of seizure activity are related to the formation and spread of discharges, which may not be easily identified through standard visual inspection and pattern classification. 18 Therefore, it is crucial for emergency physicians to accurately predict and appropriately treat such serious clinical events in the emergency department. Some observational studies have shown that seizures negatively impact quality of life and increase mortality compared to the general population.…”

Section: Discussionmentioning

confidence: 99%

Efficacy of bedside optic nerve sheath diameter measurement in differentiating provoked seizure from unprovoked seizure in the emergency department

et al. 2023

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BACKGROUND: Emergency departments (EDs) are typically the first medical contact for seizure patients, and early diagnosis and treatment is primarily the responsibility of emergency physicians. OBJECTIVES: Demonstrate the efficacy of bedside ocular ultrasonography for optic nerve sheath diameter (ONSD) measurement in differentiating provoked seizure from unprovoked seizure in the ED. DESIGN: Prospective observational study SETTINGS: Tertiary care hospital PATIENTS AND METHODS: Patients presenting to the ED with seizure were divided into two groups according to medical history, physical examination, laboratory results, cranial computed tomography findings and electroencephalography results. Patients with seizures that did not have a specific cause (unprovoked) were compared with patients who had seizures caused by underlying pathology (provoked). The measurement of the ONSD was taken at the bedside within 30 minutes of arrival. The study compared the ONSD values, age, sex, type of seizure, and Glasgow Coma Score between the two groups. MAIN OUTCOME MEASURE: Efficacy of ONSD to distinguish between provoked and unprovoked seizures. SAMPLE SIZE: 210 patients RESULTS: One hundred and fourteen (54.3%) patients were in the provoked seizure group and 96 (45.7%) were in the unprovoked seizure group. The ONSD measurements were significantly higher in the provoked seizure group compared with the unprovoked seizure group (median 6.1 mm vs. 5.2 mm, P <.001). The cut-off value of ONSD higher than 5.61 was significantly associated with the prediction of the provoked seizure ( P <.001). The area under the curve value was 0.882 (95% CI: 0.830-0.922) with a sensitivity of 86.5 and specificity of 78.9%. CONCLUSIONS: Bedside ONSD measurement by means of ocular ultrasound is an effective method for differentiating provoked seizure from unprovoked seizure. LIMITATIONS: Statistical significance of age on ONSD and exclusion of pediatric patients. CONFLICT OF INTEREST: None.

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“…There is wide variation in the optimal cut-off values for ONSD, but range from 4.8 to 5.9 mm is usually taken. [ 7 8 ]…”

mentioning

confidence: 99%

“…There is a high level of correlation between MRI and a bedside ultrasound to detect acute rise in ICP with a high level of accuracy and despite its limitations, USG ONSD measurement is likely to be more reliable than clinical assessment in the diagnosis of intracranial hypertension. [ 8 ] It has the potential to become one of the first line modalities in point of care testing to detect increased ICP, especially in emergency situations when parturient needs emergency caesarean delivery.…”

mentioning

confidence: 99%

Ultrasonographic optic nerve sheath diameter measurement in overweight parturient with intracranial tumour: Guiding choice of anaesthesia

et al. 2016

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Optic nerve sheath diameter measurement using bedside ultrasound: Is it accurate?

Cited by 5 publications

References 15 publications

Is increased intracranial pressure a reason for headache in COVID-19 patients? Evaluation with optic nerve sheath diameter

Is increased intracranial pressure a reason for headache in COVID-19 patients? Evaluation with optic nerve sheath diameter

Efficacy of bedside optic nerve sheath diameter measurement in differentiating provoked seizure from unprovoked seizure in the emergency department

Ultrasonographic optic nerve sheath diameter measurement in overweight parturient with intracranial tumour: Guiding choice of anaesthesia

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