Optic nerve sheath diameter measurement by ultrasound: Evaluation of a standardized protocol.
J Neuroimaging
; 32(1): 104-110, 2022 Jan.
Article
in English
| MEDLINE | ID: covidwho-1769736
ABSTRACT
BACKGROUND AND PURPOSE:
Treatment of elevated intracranial pressure (ICP) is central to neurocritical care, but not all patients are eligible for invasive ICP-monitoring. A promising noninvasive option is ultrasound measurement of the optic nerve sheath diameter (ONSD). However, meta-analyses of ONSD for elevated ICP show wide confidence intervals. This might be due to baseline variations, inter-rater variability, and varying measurement methods. No standardized protocol has been validated. Corrections for eyeball diameter (ED) and optic nerve diameter (OND) may compensate for baseline variations. We evaluated a protocol and compared two different measurement methods for ONSD ultrasound.METHODS:
Two operators, blinded to each other's measurements, measured ONSD, ED, and OND twice in 20 patients. ONSD was measured with two different methods in use internal (ONSDint) or external (ONSDext) of the dura mater. Intra-class correlation (ICC) was calculated for inter-rater and intra-rater reliability.RESULTS:
ICCs for inter-rater reliability of ONSDext and ONSDint (95% confidence interval) were 0.96 (0.93, 0.98) and 0.88 (0.79, 0.94), respectively. ICCs for intra-rater reliability of ONSDext and ONSDint were 0.97 (0.94, 0.99) and 0.93 (0.87, 0.96), respectively. There was no significant bias or difference in intra-rater reliability between operators.CONCLUSIONS:
ONSD can be measured with an excellent inter- and intra-rater reliability and low risk of inter-rater bias, when using this protocol. ONSDext yields a higher inter- and intra-rater reliability than ONSDint. Corrections for ED and OND can be performed reliably.Keywords
Full text:
Available
Collection:
International databases
Database:
MEDLINE
Main subject:
Intracranial Hypertension
Type of study:
Diagnostic study
/
Experimental Studies
/
Prognostic study
/
Reviews
Limits:
Humans
Language:
English
Journal:
J Neuroimaging
Journal subject:
Diagnostic Imaging
/
Neurology
Year:
2022
Document Type:
Article
Affiliation country:
Jon.12936
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