Stroke: Likelihood Ratios

Introduction: aka cerebrovascular accident. Mostly ischemic, some hemorrhagic. CT detects hemorrhagic stroke with high sensitivity. For history/physical findings to distinguish ischemic from hemorrhagic, see Hemorrhagic Stroke.

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Differential Diagnoses include: Neurocardiogenic Syncope

Prevalence

The likelihood ratios of findings for Stroke are listed below. See the left navigation bar to change the display.

Good Positive and Negative Likelihood Ratios

Finding	+LR	-LR	Comments, Study
MRI Duplicate	inf	0	DWI sequence. Within 6 hours of presentation. Study: Radiology. 2002 Aug;224(2):353-60. PMID: 12147827
MRI Duplicate	inf	0.4	"conventional", i.e. no DWI sequence. Within 6 hours of presentation. Study: Radiology. 2002 Aug;224(2):353-60. PMID: 12147827

Good Positive Likelihood Ratio

Finding	+LR	-LR	Comments, Study
Non-contrast Head CT	4.7	0.6	performed on presentation, or within 6 hours Study: Radiology. 2002 Aug;224(2):353-60. PMID: 12147827

Findings With Unspecified Accuracy

Finding	+LR	-LR	Comments, Study
Facial nerve paralysis	No accuracy specified.		Study: no study specified.