"I want to figure out which one (i.e. HDL subtype) is the problem"
neither HDL nor LDL cause or prevent heart failure, the cause of heart failure is over stimulation of the sympathetic nervous system, that's why about 50% of myocardial infarctions are caused by emotional or physical stress, and that's why drugs like Betablockers and ACE inhibitors prevent heart attacks, drugs working on cholesterol or anticoagulants are nothing but marketing hype with placebo effects.
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