STUDY OBJECTIVE: Current clinical practice assumes a negative computed tomography (CT) head scan result and a negative lumbar puncture result together are adequate to rule out subarachnoid hemorrhage in patients with acute headache. Our objective is to determine the sensitivity of a negative CT result combined with a negative lumbar puncture result to exclude subarachnoid hemorrhage. METHODS: This prospective cohort study was conducted at 2 tertiary care emergency departments (EDs) during 3 years. We enrolled all patients who were older than 15 years, had a nontraumatic acute headache and normal neurologic examination result, and who had a CT head scan and a lumbar puncture if the CT result was negative (ie, no blood in the subarachnoid space). Patients were followed up with a structured telephone questionnaire 6 to 36 months after their ED visit and electronic hospital records review to ensure no missed subarachnoid hemorrhage. We calculated sensitivity, specificity, and likelihood ratios of the strategy of CT and then lumbar puncture for subarachnoid hemorrhage. RESULTS: Five hundred ninety-two patients were enrolled, including 61 with subarachnoid hemorrhage. The mean patient age was 43.6 years, with 59.1% female patients. All cases of subarachnoid hemorrhage were identified on initial CT or lumbar puncture. One patient without subarachnoid hemorrhage was subsequently diagnosed with cerebral aneurysm, requiring surgery. The strategy classified patients with subarachnoid hemorrhage with sensitivity, specificity, and positive and negative likelihood ratios (with 95% confidence intervals [CIs]) of 100% (95% CI 94% to 100%), 67% (95% CI 63% to 71%), 3.03 (95% CI 2.69 to 3.53), and 0. For diagnosis of subarachnoid hemorrhage or aneurysm, these were 98% (95% CI 91% to 100%), 67% (95% CI 63% to 71%), 2.98 (95% CI 2.63 to 3.38), and 0.02 (95% CI 0.00 to 0.17), respectively. CONCLUSION: To our knowledge, this is the largest prospective study evaluating the accuracy of a strategy of CT and lumbar puncture to rule out subarachnoid hemorrhage in alert ED patients with an acute headache. This study validates clinical practice that a negative CT with a negative lumbar puncture is sufficient to rule out subarachnoid hemorrhage.
STUDY OBJECTIVE: Current clinical practice assumes a negative computed tomography (CT) head scan result and a negative lumbar puncture result together are adequate to rule out subarachnoid hemorrhage in patients with acute headache. Our objective is to determine the sensitivity of a negative CT result combined with a negative lumbar puncture result to exclude subarachnoid hemorrhage. METHODS: This prospective cohort study was conducted at 2 tertiary care emergency departments (EDs) during 3 years. We enrolled all patients who were older than 15 years, had a nontraumatic acute headache and normal neurologic examination result, and who had a CT head scan and a lumbar puncture if the CT result was negative (ie, no blood in the subarachnoid space). Patients were followed up with a structured telephone questionnaire 6 to 36 months after their ED visit and electronic hospital records review to ensure no missed subarachnoid hemorrhage. We calculated sensitivity, specificity, and likelihood ratios of the strategy of CT and then lumbar puncture for subarachnoid hemorrhage. RESULTS: Five hundred ninety-two patients were enrolled, including 61 with subarachnoid hemorrhage. The mean patient age was 43.6 years, with 59.1% female patients. All cases of subarachnoid hemorrhage were identified on initial CT or lumbar puncture. One patient without subarachnoid hemorrhage was subsequently diagnosed with cerebral aneurysm, requiring surgery. The strategy classified patients with subarachnoid hemorrhage with sensitivity, specificity, and positive and negative likelihood ratios (with 95% confidence intervals [CIs]) of 100% (95% CI 94% to 100%), 67% (95% CI 63% to 71%), 3.03 (95% CI 2.69 to 3.53), and 0. For diagnosis of subarachnoid hemorrhage or aneurysm, these were 98% (95% CI 91% to 100%), 67% (95% CI 63% to 71%), 2.98 (95% CI 2.63 to 3.38), and 0.02 (95% CI 0.00 to 0.17), respectively. CONCLUSION: To our knowledge, this is the largest prospective study evaluating the accuracy of a strategy of CT and lumbar puncture to rule out subarachnoid hemorrhage in alert ED patients with an acute headache. This study validates clinical practice that a negative CT with a negative lumbar puncture is sufficient to rule out subarachnoid hemorrhage.
Authors: Jeffrey J Perry; Marco L A Sivilotti; Jane Sutherland; Corinne M Hohl; Marcel Émond; Lisa A Calder; Christian Vaillancourt; Venkatesh Thirganasambandamoorthy; Howard Lesiuk; George A Wells; Ian G Stiell Journal: CMAJ Date: 2017-11-13 Impact factor: 8.262
Authors: Bilal Majed; Hélène Zephir; Valérie Pichonnier-Cassagne; Yazdan Yazdanpanah; Philippe Lestavel; Pierre Valette; Patrick Vermersch Journal: Int J Emerg Med Date: 2009-11-19
Authors: Airton Leonardo de Oliveira Manoel; Ann Mansur; Amanda Murphy; David Turkel-Parrella; Matt Macdonald; R Loch Macdonald; Walter Montanera; Thomas R Marotta; Aditya Bharatha; Khaled Effendi; Tom A Schweizer Journal: Crit Care Date: 2014-11-13 Impact factor: 9.097
Authors: Jeffrey J Perry; Bader Alyahya; Marco L A Sivilotti; Michael J Bullard; Marcel Émond; Jane Sutherland; Andrew Worster; Corinne Hohl; Jacques S Lee; Mary A Eisenhauer; Merril Pauls; Howard Lesiuk; George A Wells; Ian G Stiell Journal: BMJ Date: 2015-02-18