how much ipratropium bromide neb is prescribed to patient 78076 in total in 10/2101?
select sum(prescriptions.dose_val_rx) from prescriptions where prescriptions.hadm_id in ( select admissions.hadm_id from admissions where admissions.subject_id = 78076 ) and prescriptions.drug = 'ipratropium bromide neb' and strftime('%y-%m',prescriptions.startdate) = '2101-10'