has ever been the arterial bp mean of patient 1902 been ever less than 77.0 since 3 days 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 = 1902 ) ) and chartevents.itemid in ( select d_items.itemid from d_items where d_items.label = 'arterial bp mean' and d_items.linksto = 'chartevents' ) and chartevents.valuenum < 77.0 and datetime(chartevents.charttime) >= datetime(current_time,'-3 day')