count the number of times patient 66411 has received a lt heart angiocardiogram procedure until 3 years ago '.
select count(*) from procedures_icd where procedures_icd.icd9_code = ( select d_icd_procedures.icd9_code from d_icd_procedures where d_icd_procedures.short_title = 'lt heart angiocardiogram' ) and procedures_icd.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 66411 ) and datetime(procedures_icd.charttime) <= datetime(current_time,'-3 year')