In patients with life-threatening etiologies (eg, aortic dissection) or an unclear cause of syncope and assessed by risk stratification as high-risk, admission is advised. There is no clear evidence on how many risk factors a patient needs to require admission. A history or findings consistent with structural cardiac disease or heart failure alone would place the patient at high risk. Most guidelines recommend admission if 1 of these or if additional risk factors are present.21,40,41,43 Table 8 lists risk factors for an adverse outcome.
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