Research Article
Effect of Left Ventricular Outflow Tract Obstruction on Left Atrial Mechanics in Hypertrophic Cardiomyopathy
Table 6
Effects of septal myectomy on LA volumes and mechanics.
| | Premyectomy () | Postmyectomy () | value |
| NYHA I/II/III/IV (%) | 0/0/100/0 | 80/20/0/0 | <0.0001 | LVOT resting (mmHg) | 68.1 ± 40 | 11.0 ± 6 | <0.0001 | LVOT provocable (mmHg) | 98.3 ± 27 | 21.2 ± 14 | <0.0001 | MR: trivial/mild/moderate/severe (%) | 10/40/40/10 | 40/60/0/0 | 0.0004 | LVEF (%) | 65.9 ± 8 | 61.4 ± 9 | 0.08 | LA volume indices | | | | (mL/m2) | 66.2 ± 23 | 49.8 ± 20 | <0.0001 | (mL/m2) | 53.2 ± 24 | 39.3 ± 18 | <0.0001 | (mL/m2) | 40.5 ± 23 | 26.6 ± 16 | <0.0001 | Left atrial ejection/emptying fraction (%) | 41.6 ± 13 | 48.4 ± 10 | 0.006 | Left ventricular stroke volume (mL/m2) | 55.5 ± 11 | 48.0 ± 10 | 0.01 | Conduit volume | 57.2 ± 21 | 47.3 ± 20 | 0.066 | Reservoir function | | | | Expansion index (%) | 80.5 ± 44 | 100.1 ± 36 | 0.01 | Longitudinal reservoir strain (%) | 14.1 ± 6 | 17.3 ± 7 | 0.01 | SRs (%/sec) | 0.51 ± 0.2 | 0.57 ± 0.2 | 0.15 | Conduit function | | | | Passive emptying index/fraction (%) | 21.4 ± 9 | 22.2 ± 9 | 0.66 | SRe (%/sec) | −0.27 ± 0.2 | −0.27 ± 0.2 | 0.98 | Booster function | | | | Active emptying index/fraction (%) | 26.4 ± 11 | 33.7 ± 8 | 0.002 | Longitudinal booster strain (%) | 6.8 ± 4 | 9.8 ± 5 | 0.0001 | SRa (%/sec) | −0.48 ± 0.2 | −0.68 ± 0.2 | 0.001 |
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denotes between pre- and postmyectomy values.
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