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Obstruction after alcohol septal ablation is associated with cardiovascular mortality events
  1. Josef Veselka1,
  2. Pavol Tomašov1,
  3. Jaroslav Januška2,
  4. Jan Krejčí3,
  5. Radka Adlová1
  1. 1Department of Cardiology, 2nd Medical School, Charles University, University Hospital Motol, Prague, Czech Republic
  2. 2Department of Cardiology, Cardiocentre Podlesí, Třinec, Czech Republic
  3. 31st Department of Internal Medicine/Cardioangiology, International Clinical Research Centre, St Anne's University Hospital and Masaryk University, Brno, Czech Republic
  1. Correspondence to Professor Josef Veselka, Department of Cardiology, Motol University Hospital, V Uvalu 84, Prague 5, 15000, Czech Republic; aklesev007{at}


Background Left ventricular outflow tract obstruction (≥30 mm Hg at rest; LVOTO) is considered a possible risk of long-term outcomes in patients with hypertrophic cardiomyopathy (HCM). However, the influence of LVOTO on the occurrence of cardiovascular mortality events in patients after alcohol septal ablation (ASA) for obstructive HCM remains unresolved.

Methods We compared the outcomes of patients treated with ASA with residual LVOTO <30 mm Hg with those with residual LVOTO ≥30 mm Hg at the first postdischarge check-up (1–6 months after the procedure).

Results A total of 270 patients (60±12 years, median follow-up 5.1 years; 95% CI 4.5 to 5.9 years) treated with a single ASA were included; 208 (77%) and 62 (23%) patients had post-ASA LVOTO <30 and ≥30 mm Hg at the first postdischarge clinical check-up, respectively (LVOTO 13±6 vs 50±27 mm Hg; p<0.01). Freedom from cardiovascular mortality events at 1, 5 and 10 years were 99% (95% CI 96% to 100%) vs 94% (95% CI 85% to 98%), 95% (95% CI 89% to 97%) vs 80% (95% CI 66% to 89%) and 82% (95% CI 69% to 89%) vs 72% (95% CI 55% to 84%) (log-rank test, p<0.01), respectively. In multivariable analysis adjusted for age at ASA, sex, baseline LVOTO and baseline septum thickness, the independent predictors of cardiovascular mortality events were early postdischarge LVOTO ≥30 mm Hg (HR 2.95, 95% CI 1.26 to 6.91; p=0.01) and baseline septum thickness (HR 1.07, 95% CI 1.01 to 1.13; p=0.02).

Conclusions After ASA for obstructive HCM, LVOTO ≥30 mm Hg at the first postdischarge clinical check-up is associated with significantly higher occurrence of subsequent cardiovascular mortality events.

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