Heart muscle doesn't though. From what I remember from a family members heart attack ... the heart doesn't really heal. Hence pace makers for a lifetime. >Th

Heart muscle doesn't though. From what I remember from a family members heart attack ... the heart doesn't really heal. Hence pace makers for a lifetime. >The heart is unable to regenerate heart muscle after a heart attack and lost cardiac muscle is replaced by scar tissue. https://www.uclahealth.org/heart/cardiac-repair-regeneration https://www.uclahealth.org/heart/cardiac-repair-regeneration