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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.

revista médica de chile

Análisis crítico de un artículo: ¿Podemos descartar la presencia de hemorragia subaracnoidea con la combinación de tomografía computada cerebral y punción lumbar negativas?