Left atrial dynamics during in-scanner exercise: a CMR myocardial feature tracking study

Table 1 Left atrial volumes, deformation parameters and heart rate (HR) at rest and during supine exercise with 50 and 100 Watts (W); mean ± standard deviation.

	Rest	50W	100W	Rest vs. 50W	Rest vs. 100W	50W vs. 100W
				P value
HR [beats/min]	59.6 ± 12.4	93.8 ± 14.8	116.8 ± 12.3	< 0.001	< 0.001	< 0.001
V.max [ml]	65.7 ± 18.7	65.4 ± 21.0	68.4 ± 23.5	0.903	0.94	0.979
V.p-ac [ml]	35.9 ± 11.3	31.2 ± 17.8	31.6 ± 13.7	0.375	0.39	0.742
V.min [ml]	26.0 ± 11.6	16.8 ± 8.6	19.7 ± 9.6	0.014	0.113	0.45
LAEF total [%]	61 ± 9	75 ± 7	71 ± 8	< 0.001	0.013	0.23
LAEF passive [%]	44 ± 14	55 ± 13	54 ± 9	0.059	0.085	0.976
LAEF booster [%]	27 ± 25	43 ± 17	37 ± 17	0.079	0.248	0.475
LA Reservoir Function
Es [%]	33.3 ± 14.1	41.8 ± 13.5	40.5 ± 14.5	0.063	0.089	0.487
SRs [s-1]	1.3 ± 0.5	1.9 ± 0.6	2.0 ± 0.7	0.003	< 0.001	0.93
LA Conduit Function
Ee [%]	21.1 ± 11.2	26.6 ± 9.5	25 ± 12.4	0.052	0.21	0.576
SRe [s-1]	-1.0 ± 0.3	-1.6 ± 0.5	-1.6 ± 1.0	< 0.001	0.024	0.979
LA Booster Pump Function
Ea [%]	12.2 ± 6.2	15.2 ± 7.7	15.5 ± 4.6	0.281	0.178	0.611
SRa [s-1]	-0.9 ± 0.4	-1.5 ± 0.7	-1.8 ± 0.9	0.008	0.002	0.73

HR, heart rate; V.max., maximum left atrial volume; V.p-ac, left atrial volume prior to left atrial contraction; V.min., minimum left atrial volume; LAEF, left atrial emptying fraction; E, strain; SR, strain rate. Bold p values indicate a significance level < 0.05 as determined by Student's paired t-test.

ISSN: 1532-429X