instruction: how many days have it been since patient 42473 was diagnosed with a crnry athrscl natve vssl in the current hospital encounter for the first time?
response: SELECT 1 * (STRFTIME('%j', CURRENT_TIME()) - STRFTIME('%j', diagnoses_icd.charttime)) FROM diagnoses_icd WHERE diagnoses_icd.icd9_code = (SELECT d_icd_diagnoses.icd9_code FROM d_icd_diagnoses WHERE d_icd_diagnoses.short_title = 'crnry athrscl natve vssl') AND diagnoses_icd.hadm_id IN (SELECT admissions.hadm_id FROM admissions WHERE admissions.subject_id = 42473 AND admissions.dischtime IS NULL) ORDER BY diagnoses_icd.charttime LIMIT 1