when was the first time in which patient 92721 received a dx ultrasound-heart procedure since 2105?
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 = 'dx ultrasound-heart' ) and procedures_icd.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 92721 ) and strftime('%y',procedures_icd.charttime) >= '2105' order by procedures_icd.charttime asc limit 1