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Figure 6 Time course of residual atrial shunts following buttoned device (fourth generation) occlusion of atrial septal defects. Percent of patients with residual shunts (NRS/NE) = 100, where NRS is the number of subjects with residual shunt and NE is the number of subjects examined at a particular follow-up interval. The NRS/NE at varying intervals are as follows: one day: 115/417; one month: 113/333; six months: 100/310; one year: 82/280; two years: 43/177; three years: 11/88; four years: 5/48 and five years: 0/8. Note gradual decrease in percent of patients with residual shunt.
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