instruction: what is the number of patients whose admission location is emergency room admit and procedure short title is coronar arteriogr-1 cath?
response: SELECT COUNT(DISTINCT demographic.subject_id) FROM demographic INNER JOIN procedures ON demographic.hadm_id = procedures.hadm_id WHERE demographic.admission_location = "EMERGENCY ROOM ADMIT" AND procedures.short_title = "Coronar arteriogr-1 cath"