when is the last time that patient 42396 has received a venous cath nec until 4 years ago?
select procedures_icd.charttime from procedures_icd where procedures_icd.icd9_code = ( select d_icd_procedures.icd9_code from d_icd_procedures where d_icd_procedures.short_title = 'venous cath nec' ) and procedures_icd.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 42396 ) and datetime(procedures_icd.charttime) <= datetime(current_time,'-4 year') order by procedures_icd.charttime desc limit 1