Optic Nerve Sheath Diameter: Translating a Terrestrial Focused Technique into a Clinical Monitoring Tool for Spaceflight

Mason, Sara; Foy, Millennia; Sargsyan, Ashot; Garcia, Kathleen; Wear, Mary L.; Bedi, Deepak; Ernst, Randy; Van Baalen, Mary

Ultrasonography is increasingly used to quickly measure optic nerve sheath diameter (ONSD) when increased intracranial pressure (ICP) is suspected. NASA Space and Clinical Operations Division has been using ground and on‐orbit ultrasound since 2009 as a proxy for ICP in non‐acute monitoring for space medicine purposes. In the terrestrial emergency room population, an ONSD greater than 0.59 cm is considered highly predictive of elevated intracranial pressure. However, this cut‐off limit is not applicable to the spaceflight setting since over 50% of US Operating Segment (USOS) astronauts have an ONSD greater than 0.60 cm even before launch. Crew Surgeon clinical decision‐making is complicated by the fact that many astronauts have history of previous spaceflights. Our data characterize the distribution of baseline ONSD in the astronaut corps, its longitudinal trends in long‐duration spaceflight, and the predictive power of this measure related to increased ICP outcomes.

Document ID

20150001890

Acquisition Source

Johnson Space Center

Document Type

Presentation

Authors

Date Acquired

February 20, 2015

Publication Date

January 13, 2015

Subject Category

Report/Patent Number

Meeting Information

Meeting: Human Research Program Investigators'' Workshop: Integrated Pathways to Mars

Location: Galveston, TX

Country: United States

Start Date: January 13, 2015

End Date: January 15, 2015

Sponsors: National Space Biomedical Research Inst., NASA Johnson Space Center

Distribution Limits

Public

Public Use Permitted.

Available Downloads

Name

Type

20150001890.pdf

STI

No Preview Available

NTRS

NTRS - NASA Technical Reports Server

Available Downloads

Related Records