Learning and reproducibility of ultrasonographic assessment of the optic nerve sheath diameter: A cohort study
Authors' conclusion
According to our findings, the ultrasonographic assessment of the ONSD is easy to learn and expertise is gained quickly, especially for individuals with previous ultrasound experience. The data show good inter-examiner reliability on everyday patients.
Study context
- Population
- Individuals naive to optic nerve sheath diameter (ONSD) measurement (learning phase) and intubated, sedated ICU patients (reliability phase), single tertiary centre in north-western Germanyplus 2 ICU patients
- Participants
- 9 participants
- Exposure
- With ultrasound experience vs Without ultrasound experience
- Outcome
- Learning progress (examination time; decrease in deviation of results from each individual's mean ONSD); inter-examiner ICC in ICU patients
Methodological detailssingle tertiary centre, Examination introduced following the Cognitive Apprenticeship method, Examiners served as volunteers for each other during the learning phase
- Single tertiary centre
- Examination introduced following the Cognitive Apprenticeship method
- Examiners served as volunteers for each other during the learning phase
Main finding
As reported in the abstract
Learning progress and inter-examiner reliability
P = 0.012
- Mean examination time decreased from first to eighth measurement (s), nearly exponential, P = 0.054
- 79 ± 48 to 48 ± 14
- ICC from measurements on the two patients
- 0.832 (95% CI, 0.428 to 0.988)
Observational data: associations, not effects.
Original publication
Learning and reproducibility of ultrasonographic assessment of the optic nerve sheath diameter: A cohort study. Eur J Anaesthesiol Intensive Care. Published 21 May 2025. doi:10.
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