what was the total drain out #4 wound vac output amount that patient 65582 had on the current intensive care unit visit?
select sum(outputevents.value) from outputevents where outputevents.icustay_id in ( select icustays.icustay_id from icustays where icustays.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 65582 ) and icustays.outtime is null ) and outputevents.itemid in ( select d_items.itemid from d_items where d_items.label = 'drain out #4 wound vac' and d_items.linksto = 'outputevents' )