Reverse remodeling of left atrium assessed by cardiovascular magnetic resonance feature tracking in hypertrophic obstructive cardiomyopathy after septal myectomy

Table 3 LA parameters in control group and hypertrophic obstructive cardiomyopathy group before and after myectomy

Parameter	Premyectomy (n = 88)	Postmyectomy (n = 88)	Healthy controls (n = 86)	P value for premyectomy vs. postmyectomy
LA structural parameter
LA anteroposterior diameter (mm)	41 ± 8^†	37 ± 8^†	28 ± 6	< 0.001
LA left–right diameter (mm)	70 (63, 76)^†	63 (58, 70)^†	57 (51, 62)	< 0.001
LA V_max index (ml/m²)	69.3 ± 25.9^†	50.0 ± 16.2^†	36.9 ± 8.4	< 0.001
LA V_pac index (ml/m²)	48.4 (38.1, 71.2)^†	38.3 (32.2, 44.9)^†	23.4 (20.2, 26.9)	< 0.001
LA V_min index (ml/m²)	42.2 ± 24.4^†	26.4 ± 15.8^†	13.4 ± 4.1	< 0.001
LA reservoir function
LA total EF (%)	42.5 ± 12.5^†	49.4 ± 11.7^†	64.0 ± 5.4	< 0.001
εs (%)	21.0 ± 9.8^†	25.6 ± 9.5^†	43.0 ± 9.0	< 0.001
SRs (1/s)	0.77 (0.53, 1.10)^†	0.88 (0.67, 1.22)^†	1.50 (1.33, 1.72)	0.003
LA conduit function
LA passive EF (%)	18.5 ± 9.1^†	19.6 ± 8.7^†	33.8 ± 8.7	0.31
εe (%)	9.2 (5.8, 13.5)^†	10.0 (7.0, 13.1)^†	22.3 (17.9, 29.9)	0.21
SRe (1/s)	− 0.48 (− 0.32, − 0.74)^†	− 0.58 (− 0.41, − 0.77)^†	− 1.33 (− 1.11, − 1.75)	0.007
LA booster pump function
LA booster EF (%)	29.7 ± 11.7^†	37.5 ± 10.8^†	45.4 ± 6.4	< 0.001
εa (%)	9.9 (6.0, 14.2)^†	14.3 (11.0, 18.2)^†	19.2 (16.6, 22.8)	< 0.001
SRa (1/s)	− 0.83 (− 0.54, − 1.26)^†	− 1.17 (− 0.86, − 1.52)^†	− 1.72 (− 1.47, − 2.10)	< 0.001

Values are presented as mean ± standard deviations or median (interquartile range)
LA left atrial, EF emptying fraction
^†Indicating P value < 0.05 for patients with hypertrophic obstructive cardiomyopathy versus healthy participants

ISSN: 1532-429X