• Takeshi Ueda, Eri Ishida, Yusuke Kojima, Satoshi Yoshikawa, and Hitoshi Yonemoto.
• Rakuwakai Marutamachi Hospital, Emergency and General Internal Medicine, Kyoto, Japan.
• J Neuroimaging. 2015 Nov 1; 25 (6): 927-30.

Background And PurposeThe early prediction of hypoxic encephalopathy after cardiac arrest is challenging. Measurement of the optic nerve sheath diameter (ONSD) by using sonography is a straightforward, noninvasive technique to detect an increased intracranial pressure, which can even be conducted at the bedside. However, it remains unknown whether or not sonographic ONSD measurement is valuable as a prognostic indicator of hypoxic encephalopathy.MethodsSeventeen patients after cardiac arrest were retrospectively enrolled in this study. ONSD measurements 3 mm behind the papilla were recorded. A Glasgow Outcome Scale score of 4 or above was considered to indicate a favorable prognosis.ResultsThe mean ONSD associated with a favorable prognosis was 5.0 mm (4.4-6.1 mm). The ONSD associated with a poor prognosis was 6.1 mm (5.4-7.2 mm). ONSD less than or equal to 5.4 mm was an indicator of a favorable prognosis, with a sensitivity of 83%, specificity of 73%, positive likelihood ratio of 3.1, and negative likelihood ratio of .23.ConclusionsSonographic ONSD measurement is a simple, rapid technique to assess the neurological prognosis after cardiac arrest.Copyright © 2015 by the American Society of Neuroimaging.

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