title: Obstruction after alcohol septal ablation is associated with cardiovascular mortality events.
abstract: 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.
authors: Department of Cardiology, 2nd Medical School, Charles University, University Hospital Motol, Prague, Czech Republic.
authors: Josef
authors: J
authors: Veselka
authors: Department of Cardiology, 2nd Medical School, Charles University, University Hospital Motol, Prague, Czech Republic.
authors: Pavol
authors: P
authors: Tomašov
authors: Department of Cardiology, Cardiocentre Podlesí, Třinec, Czech Republic.
authors: Jaroslav
authors: J
authors: Januška
authors: 1st Department of Internal Medicine/Cardioangiology, International Clinical Research Centre, St Anne's University Hospital and Masaryk University, Brno, Czech Republic.
authors: Jan
authors: J
authors: Krejčí
authors: Department of Cardiology, 2nd Medical School, Charles University, University Hospital Motol, Prague, Czech Republic.
authors: Radka
authors: R
authors: Adlová