when was the first time the arterial bp [systolic] of patient 4368 was measured on 05/24/2105 at less than 143.0?
select chartevents.charttime 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 = 4368 ) ) and chartevents.itemid in ( select d_items.itemid from d_items where d_items.label = 'arterial bp [systolic]' and d_items.linksto = 'chartevents' ) and chartevents.valuenum < 143.0 and strftime('%y-%m-%d',chartevents.charttime) = '2105-05-24' order by chartevents.charttime asc limit 1