Sensitivity of newer-generation computed tomography scanners for subarachnoid hemorrhage: a Bayesian analysis

J Emerg Med. 2012 Jul;43(1):13-8. doi: 10.1016/j.jemermed.2011.09.012. Epub 2012 Feb 10.

Abstract

Background: Subarachnoid hemorrhage (SAH) is a life-threatening condition considered in patients presenting to the emergency department (ED) with acute and severe-onset headache. Currently, the practice pattern for suspected SAH is to perform a non-contrasted computed tomography (CT) scan of the head, followed by lumbar puncture (LP) if the CT is negative. Newer-generation 16-slice CT scanners have been shown in one study to be very sensitive for SAH.

Objective: We sought to validate these findings at our institution by retrospectively analyzing the sensitivity of our 16-slice or better CT scanner and performing a bayesian analysis with the results.

Methods: We utilized ED electronic medical records and the Department of Neurosurgery research database to search for patients admitted from the ED with a diagnosis of SAH from January 1, 2005 to December 31, 2008. We found a total of 134 patients admitted with SAH during this time frame.

Results: Average age was 53.8 years; 62% were female. Presenting complaint was headache in 57%, paresthesia or weakness in 7%, unresponsive in 10%, confusion or altered mental status in 5%, and "other" in 10%. Sensitivity of 16-slice or better CT scanner in our study was 131/134, or 97.8% (95% confidence interval 93.1-99.4%). No patient with a negative CT had a lesion requiring intervention.

Conclusion: Our study confirms the high sensitivity of 16-slice or better CT scanners for SAH. This calls into question the need for LP after negative head CT when 16-slice CT or better is used.

MeSH terms

  • Bayes Theorem
  • Confusion / etiology
  • Emergency Service, Hospital
  • Female
  • Headache / etiology
  • Humans
  • Male
  • Middle Aged
  • Muscle Weakness / etiology
  • Paresthesia / etiology
  • Retrospective Studies
  • Sensitivity and Specificity
  • Spinal Puncture
  • Subarachnoid Hemorrhage / complications
  • Subarachnoid Hemorrhage / diagnosis
  • Subarachnoid Hemorrhage / diagnostic imaging*
  • Tomography, X-Ray Computed / instrumentation*