Cite this post as:
Scott Weingart, MD FCCM. Optic Nerve Sheath Ultrasound for Detecting Increased Intracranial Pressure (ICP). EMCrit Blog. Published on July 24, 2012. Accessed on June 10th 2023. Available at [https://emcrit.org/emcrit/optic-nerve-sheath-ultrasound-for-detecting-increased-icp/ ].
Dr. Scott Weingart, Course Director, reports no relevant financial relationships with ineligible companies.
This episode’s speaker(s), (listed above), report no relevant financial relationships with ineligible companies.
Original Release: July 24, 2012
Date of Most Recent Review: Jan 1, 2022
Termination Date: Jan 1, 2025
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Hi, I’m wondering why the ETCO2 may not match the PaCO2 in a head injury patient (who is not in shock or has any underlying cardiovascular disease). Thanks!
If they had none of those things, and no atelectasis, and no other trauma it would probably correlate fairly well–at first. Most TBI patients are not that isolated. One correlated set- of-samples doesn’t tell you that their lungs have not started to get bad later on. The TBI state leads to ALI and ARDS on its own without any coexisting external lung injury.
Got it, thanks!
This just wants me to have a Pocket ultrasound machine when I’m on calls. Besides that this is excellent stuff thanks Ultrasound guys!
I used this technique just last week to confirm an elevated ICP reading by a Codman. I didn’t have a Tegaderm handy, so I just cut a latex glove into sort of a square sheet which I draped over the patient’s closed eye, and then applied ultrasound gel over the latex, leaving the eye completely residue free. Perfect images. Great podcast!
nice tip, my friend
not sure if this is still active, but im looking for definitive measurement techniques as have had numerous discussions about measuring inside or outside diameter. When there appears to be a double lumen (not sure how else to explain) some research states measure inside and the outer lumen may only be “feedback” or “shine-through” and some say to use outer lumen as it represents the actual sheath and the inner darker lines are from the nerve. Can you help settle? Thx
it depends on the resolution of the probe. for our crappy ED/ICU ones, outside diameter is the way to go. Optho level ultrasound machines they measure differently.