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Rule Out Subarachnoid Hemorrhage for Headache: The Ottawa Subarachnoid Hemorrhage Rule 

Rule Out Subarachnoid Hemorrhage for Headache: The Ottawa Subarachnoid Hemorrhage Rule
Chapter:
Rule Out Subarachnoid Hemorrhage for Headache: The Ottawa Subarachnoid Hemorrhage Rule
Author(s):

Christoph I. Lee

DOI:
10.1093/med/9780190223700.003.0003
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date: 18 October 2019

This chapter, found in the headache section of the book, provides a succinct synopsis of a key study examining the use of computed tomography (CT) to rule out a head bleed or subarachnoid hemorrhage among patients with acute headaches. This summary outlines the study methodology and design, major results, limitations and criticisms, related studies and additional information, and clinical implications. Researchers reported that the criteria had high sensitivity and high negative predictive value for identifying subarachnoid hemorrhage among patients presenting to the emergency department with acute nontraumatic headache that reached maximal intensity within 1 hour and with normal neurologic examinations. In addition to outlining the most salient features of the study, a clinical vignette and imaging example are included in order to provide relevant clinical context.

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