3.2 RT-3DE and 2D-STI parameters
The parameters obtained by RT-3DE are shown in Table 2. Compared with control group, LAVImax, LAVIp and LAVImin in paroxysmal AF group and persistent AF group increased in turn, but LATEF, LAAEF and LAPEF decreased in turn. The left atrial volume curves obtained by RT-3DE among the three groups are shown in Figure 2.
Left atrial strain measured by 2D-STI among the three groups are shown in Table 2. The LASr, LASct and LAScd of patients in persistent AF group were significantly lower than those in paroxysmal AF group, while the left atrial strain of patients in paroxysmal AF group were significantly lower than those in control group. Figure 3 shows the left atrial strain curves obtained by 2D-STI among the three groups.