on 04/22/2105 the heart rate of patient 6580 was ever less than 86.0?
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 = 6580 ) ) 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 < 86.0 and strftime('%y-%m-%d',chartevents.charttime) = '2105-04-22'