instruction: when was the first time in which patient 92721 received a dx ultrasound-heart procedure since 2105?
response: 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 LIMIT 1