sonographic evaluation of spaceflight effects on the eye...
TRANSCRIPT
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Sonographic Evaluation of Spaceflight Effects on the Eye and Orbit
A. Sargsyan1, D. Bedi2, R. Ernst2, K. Garcia1, M. Van Baalen3, M. Foy1, S. Mason7, M. Wear1, U. Straube4, V. Damann4, K. Shimada5, J-M. Comtois6, D. Ebert1, D. Hamilton1, W. Tarver2, S. Hart2, S. Moynihan2, T. Taddeo2
84th Annual Scientific Meeting, AsMA, Chicago 2013
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Disclosure Information84th AsMA Annual Scientific Meeting
Ashot E. Sargsyan
No financial relationships to disclose
Will not discuss off-label use and/or investigational use
• New/advanced protocol and measurement/grading techniques
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Purpose
To review selected parameters derived from eye and orbit sonography in astronauts using new quantitative and qualitative techniques
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Introduction• High-definition eye/orbit sonographic protocol
is part of a battery of monitoring tests for use in all mission phases including flight
• Only sporadic evidence exists in peer-reviewed literature, with low-fidelity imaging
• No standards or applicable evidence-based guidelines/criteria available
• Own cohort data are to be used
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Materials and Methods: Subjects
International Space Station and Shuttle crewmembers
Average Age (Years)
N
Female 46.4 7
Male 48.7 35
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Materials and Methods: Equipment
•Early phase: – HDI-5000 multipurpose
ultrasound system (ATL/Philips Medical Systems, WA, USA)
•Majority:– Pre- and post-flight data: HD-15
multipurpose ultrasound system (Philips Medical Systems, WA, USA)
– In-flight data: Vivid Q multipurpose ultrasound system (General Electric, USA)
• High-frequency (12 MHz) linear array probes
• DICOM image analysis software Prosolv Cardiovascular (Fujifilm, USA)
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“…the rig we used to measure how Tom Marshburn's heart is changing and adapting without gravity… Photograph by: Chris Hadfield, @Cmdr_Hadfield, Twitter
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Materials and Methods: Timing
Standardized protocol:
•Pre-flight : Launch – (up to) 360d•In-flight: Launch +30d; Launch +90d; Landing - 30d•Post-flight: Landing + 3-7d
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Materials and MethodsStandardized protocol Parameters
PARAMETER Exp. Range; units
1 US Optic Nerve Sheath Diameter (US ONSD) 0.4 – 1.0 cm2 US Optic Nerve Diameter (US OND) 0.24 - 0.6 cm3 US Globe Flattening Grades 0, 1, 2, 34 US Disc Elevation Grades 0, 1, 2, 35 Optic Nerve Sheath Hypoechogenicity Grades 0, 1, 2, 36 Optic Nerve Sheath Inhomogeneity Grades 0, 1, 2, 37 A-P Diameter (2D US Biometry) 2.10 – 2.70 cm8 ON tortuosity Grades 0, 1, 2, 39 Asymptomatic pathology (Eye and Orbit) Varies
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Materials and MethodsStandardized protocol
Standard Views 1. Sagittal Antero-posterior Globe View
2. Sagittal Oblique View - Lateral 3. Axial Antero-posterior Globe View4. Axial Oblique View through upper lid 5. Axial Lateral View
Additional /AlternativeViews
1. Sagittal Oblique View - Medial2. Axial Oblique View through lower lid3. Other views as clinically indicated or informative
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Optic Nerve Sheath Diameter (ONSD) measurement
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Technique and Quality Criteria for ONSD measurement
• Near-axial plane, forward gaze• No lens in view• Image plane intersects disc center (ON
penetration point), ie, “dark meets dark”)• Clear differentiation of ON proper and
arachnoid – “dark stripe” technique not acceptable
• Structure of the arachnoid layer must be visible• Measure at 3-4mm from vitreo-retinal interface• Measure perpendicular to the ON axis • Measure bilaterally and in 2+ image frames • For ONSD monitoring, review prior studies
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US inter-measurer reliabilitySpearman Correlation
OD OS Cyclop3 4 5 3 4 5 3 4 5
0.92 0.94 0.89 0.92 0.94 0.94 0.91 0.93 0.90Concordance Correlation Coefficient
OD OS Cyclop3 4 5 3 4 5 3 4 5
0.91 0.92 0.88 0.91 0.93 0.92 0.85 0.89 0.86
No significant effects for side, flight phase, or time between tests.
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Results: Preflight ONSD Distribution
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ONSD Across Mission Phases
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Preflight ONSD vs. VIIP ClassCutoff 0.6 0.65 0.7
Class 1-4
Sensitivity 0.82 (0.48,0.97) 0.55 (0.25, 0.82) 0.45 (0.18, 0.75)
Specificity 0.6 (0.17, 0.93) 1.00 (0.46,1.00) 1.00 (0.46, 1.00)
Class 2-4
Sensitivity 0.89 (0.51, 0.99) 0.67 (0.31, 0.91) 0.56 (0.23, 0.85)
Specificity 0.57 (0.20, 0.88) 1.00 (0.56, 1.00) 1.00 (0.56, 1.00)
Class 3-4 (disk edema present)
Sensitivity 1.00 (0.40, 1.00) 1.00 (0.40, 1.00) 0.75 (0.22, 0.99)
Specificity 0.42 (0.16, 0.71) 0.82 (0.48, 0.97) 0.83 (0.51, 0.97)
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Preflight ONSD vs. VIIP Class (32 ISS astronauts)
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Globe Flattening
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Globe Flattening• The most ubiquitous ultrasound finding in “cases”• Grades 1-3 in > 40% in ISS crew post flight (57% at some point)• Grade 2-3 in ~12% in at least one eye at some point (10% by MRI)
• Present in: 10/12 crewmembers with ΔCR ≥0.5D
90% of ONSD increase100% in those with choroidal folds8/8 of disc edema
Grade 1 is transient in several cases, may represent normal (anatomical variants or physiological response)
Globe flattening appears to differ in intensity and character; choroidal engorgement and full-thickness globe flattening are two contributing mechanisms
The reliability of this parameter is not yet examined
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Globe Flattening: Pre/In/Post
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AP Diameter Across Mission Phases
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AP Diameter/Refractive Error
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AP Diameter vs. Axial Length
Concordance Correlation: 0.66
Spearman Correlation: 0.90
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Forward Work• Continued review and analysis, correlation with
clinical data, MRI, OCT, etc• Quality and transferability assurance • Peer review • Transfer of methodology to investigator teams• Inter-modality analysis (US vs MRI; US vs. optical
biometry etc.)• Classification and quantification of flattening• Quantification of sheath structure• Reconciliation of methodology with “terrestrial”
authors – ONSD etc.
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Conclusions
1. Standardized protocol appears sound and consistent
2. Own evidence / cohort approach for ONSD appears to be effective, method is reliable and accurate
3. Selected parameters fit well in the clinical approach to VIIP and address; recommend continued use
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