instruction: tell me the number of patients diagnosed with subarachnoid hemorrhage who have iv bolus route of drug administration.
response: SELECT COUNT(DISTINCT demographic.subject_id) FROM demographic INNER JOIN diagnoses ON demographic.hadm_id = diagnoses.hadm_id INNER JOIN prescriptions ON demographic.hadm_id = prescriptions.hadm_id WHERE diagnoses.short_title = "Subarachnoid hemorrhage" AND prescriptions.route = "IV BOLUS"