instruction: how many patients are diagnosed with primary disease hypertension; rule out coronary artery heart disease/cardiac cath and procedure icd9 code 7761?
response: SELECT COUNT(DISTINCT demographic.subject_id) FROM demographic INNER JOIN procedures ON demographic.hadm_id = procedures.hadm_id WHERE demographic.diagnosis = "HYPERTENSION;RULE OUT CORONARY ARTERY DISEASE\CARDIAC CATH" AND procedures.icd9_code = "7761"