i would like to know the daily maximum amount of .9% normal saline that patient 25493 has received since 38 months ago.
select max(inputevents_cv.amount) from inputevents_cv where inputevents_cv.icustay_id in ( select icustays.icustay_id from icustays where icustays.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 25493 ) ) and inputevents_cv.itemid in ( select d_items.itemid from d_items where d_items.label = '.9% normal saline' and d_items.linksto = 'inputevents_cv' ) and datetime(inputevents_cv.charttime) >= datetime(current_time,'-38 month') group by strftime('%y-%m-%d',inputevents_cv.charttime)