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Figure 2 Mean left atrial diameter from M-mode echocardiographic measurements at implantation and during follow-up. Pre = the day before pacemaker implantation; 1 day = the day after pacemaker implantation. Numbers below x-axis indicate numbers of patients who had M-mode echocardiography at each follow-up in each group. Solid diamonds = AAIR; solid squares = DDDR-s; solid triangles = DDDR-l; stars = DDDR-s-AAI. Abbreviations as in Tables 1 and 2.