Table 1

‚ÄÉRisk of recurrent brain infarction according to presence or absence of PFO and ASA in a registry of patients with a cryptogenic stroke. Adapted from Mas et al8

1 year (95% CI)2 years (95% CI)3 years (95% CI)4 years (95% CI)Mean annual risk
ASA, atrial septal aneurysm; CI, confidence interval; PFO, patent foramen ovale.
No PFO no ASA2.0 (0.4 to 3.6)3.7 (1.6 to 5.8)4.2 (1.8 to 6.6)4.2 (1.8 to 6.6)1.1
PFO only1.8 (0.05 to 3.6)1.8 (0.05 to 3.6)2.3 (0.3 to 4.3)2.3 (0.3 to 4.3)0.6
ASA only00000
PFO + ASA2.0 (0 to 5.8)4.0 (0 to 9.4)6.3 (0 to 13.2)15.2 (1.8 to 28.5)4.0