does patient 12726 have a normal heart rate since 64 months ago?
select count(*)>0 from chartevents where chartevents.icustay_id in ( select icustays.icustay_id from icustays where icustays.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 12726 ) ) and chartevents.itemid in ( select d_items.itemid from d_items where d_items.label = 'heart rate' and d_items.linksto = 'chartevents' ) and chartevents.valuenum between heart_rate_lower and heart_rate_upper and datetime(chartevents.charttime) >= datetime(current_time,'-64 month')