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Child's Nervous System

, Volume 32, Issue 10, pp 1769–1778 | Cite as

The relationship between transorbital ultrasound measurement of the optic nerve sheath diameter (ONSD) and invasively measured ICP in children

Part I: repeatability, observer variability and general analysis
  • Llewellyn C. Padayachy
  • Vaishali Padayachy
  • Ushma Galal
  • Rebecca Gray
  • A. Graham Fieggen
A.J. Raimondi ISPN Award

Abstract

Purpose

The aim of this study was to investigate the relationship between optic nerve sheath diameter (ONSD) measurement and invasively measured intracranial pressure (ICP) in children.

Methods

ONSD measurement was performed prior to invasive measurement of ICP. The mean binocular ONSD measurement was compared to the ICP reading. Physiological variables including systolic blood pressure (SBP), diastolic blood pressure (DBP), mean arterial pressure (MAP), pulse rate, temperature, respiratory rate and end tidal carbon dioxide (ETCO2) level were recorded at the time of ONSD measurement. Diagnostic accuracy analysis was performed at various ICP thresholds and  repeatability, intra- and inter-observer variability, correlation between measurements in different imaging planes as well the relationship over the entire patient cohort were examined in part I of this study.

Results

Data from 174 patients were analysed. Repeatability and intra-observer variability were excellent (α = 0.97–0.99). Testing for inter-observer variability revealed good correlation (r = 0.89, p < 0.001). Imaging in the sagittal plane demonstrated a slightly better correlation with ICP (r = 0.66, p < 0.001). The ONSD measurement with the best diagnostic accuracy for detecting an ICP ≥ 20 mmHg over the entire patient cohort was 5.5 mm, sensitivity 93.2 %, specificity 74 % and odds ratio (OR) of 39.3.

Conclusion

Transorbital ultrasound measurement of the OSND is a reliable and reproducible technique, demonstrating a good relationship with ICP and high diagnostic accuracy for detecting raised ICP.

Keywords

Non-invasive ICP monitoring Optic nerve sheath diameter Ultrasound 

Notes

Compliance with ethical standards

Conflict of interest

The authors have no conflict of interest to report.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • Llewellyn C. Padayachy
    • 1
  • Vaishali Padayachy
    • 2
  • Ushma Galal
    • 3
  • Rebecca Gray
    • 4
  • A. Graham Fieggen
    • 1
  1. 1.Paediatric Neurosurgery Unit, Division of Neurosurgery, Faculty of Health SciencesUniversity of Cape Town, Red Cross War Memorial Children’s HospitalCape TownSouth Africa
  2. 2.Trauma Unit, Red Cross War Memorial Children’s HospitalUniversity of Cape TownCape TownSouth Africa
  3. 3.Department of Statistical SciencesUniversity of Cape TownCape TownSouth Africa
  4. 4.Department of Paediatric Aneasthesia, Red Cross War Memorial Children’s HospitalUniversity of Cape TownCape TownSouth Africa

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