In the four-chamber view , the difference was 58 ( 7 ) ms after RVSP and 49 ( 7 ) ms after HP , P = 0.27 ; in the two-chamber view , the difference was 45 ( 5 ) ms after RVSP and 31 ( 4 ) ms after HP , P = 0.02 , and in the apical long-axis view , the difference was 63 ( 6 ) after RVSP and 44 ( 7 ) after HP , P = 0.03 .