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Background The aim of this study was to develop a screening score system of non-contrast transthoracic echocardiography (TTE) for patent foramen ovale (PFO) in patients with embolic stroke of undetermined source (ESUS). Methods We performed a retrospective analysis of 218 consecutive patients with a recent ESUS from 2015 to 2018, who received TTE and transcranial Doppler (TCD) as routine examinations. PFO was diagnosed by the bubble test of TCD. Significant differences of the non-contrast TTE findings and patient characteristics between PFO group and non-PFO group were selected into a score. Results PFO was diagnosed in 35.8% (78/218) of the patients. Compared with non-PFO group, a larger median aortic root diameter (ARd) (34 mm vs. 32 mm,  p  = 0.005), a lower median peak E wave velocity (Em) (61.5 cm/s vs. 68 cm/s,  p  = 0.005) and a lower incidence rate of mitral regurgitation (34.6% vs. 50.7%,  p  = 0.022) were seen in PFO group. ARd&gt;33 mm and Em  33 mm, Em &lt; 72 cm/s and without mitral regurgitation) and no history of diabetes predicted PFO with an area under curve of 0.67 (95%CI 0.57–0.72,  p  &lt; 0.001). MEAD score ≥ 3 was the best threshold to predict PFO with an accuracy of 0.64 (95% CI 0.57–0.7), a sensitivity of 0.65 (95% CI 0.53–0.75) and a specificity of 0.63 (95% CI 0.55–0.71). Conclusion The MEAD score measured with non-contrast TTE can be used to select patients for bubble test of TCD to increase the diagnostic yield of PFO after ESUS.

A score of non-contrast transthoracic echocardiography to screen patent foramen ovale in patients with embolic stroke of undetermined source