Publication Date:
2019-07-13
Description:
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 onorbit ultrasound since 2009 as a proxy for ICP in nonacute 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 cutoff 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 decisionmaking 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 longduration spaceflight, and the predictive power of this measure related to increased ICP outcomes.
Keywords:
Aerospace Medicine
Type:
JSC-CN-32700
,
Human Research Program Investigators'' Workshop: Integrated Pathways to Mars; Jan 13, 2015 - Jan 15, 2015; Galveston, TX; United States
Format:
application/pdf
