although usually asymptomatic
虽然通常没有症状
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Although people with HCM usually display mild symptoms or are completely asymptomatic, up to 1% of affected people succumb to sudden cardiac death (SCD), often with no previous signs of illness.
尽管HCM患者通常仅有轻微症状或完全无症状，但1 %的受累患者发生心脏性猝死(SCD)，而此前往往却没有患病迹象。
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