tell me the total amount of pigtail infusion that patient 7165 has taken on the first intensive care unit visit?
select sum(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 = 7165 ) and icustays.outtime is not null order by icustays.intime asc limit 1 ) and inputevents_cv.itemid in ( select d_items.itemid from d_items where d_items.label = 'pigtail infusion' and d_items.linksto = 'inputevents_cv' )