Endpoints and follow-up data
The clinical status of the participants was ascertained through
telephone interviews at least once a year after septal myectomy. Those
patients who died were treated as the endpoints, and the follow-up time
was defined as their time of death. The last follow-up of the survivors
was conducted in June 2018. The clinical endpoints in this study were
defined as all-cause death, cardiovascular death, and
nonfatal MI. The combined
endpoints include the former three endpoints. Cardiovascular death was
defined as any death with no clear non-cardiac cause. MI was diagnosed
according to the standard definition (serum cardiac biomarker elevation
with symptoms of ischemia and/or ECG changes indicative of new
ischemia/infarction).