instruction: what was the last dose of sodium chloride during their current hospital encounter given to patient 82132?
response: SELECT prescriptions.dose_val_rx FROM prescriptions WHERE prescriptions.hadm_id IN (SELECT admissions.hadm_id FROM admissions WHERE admissions.subject_id = 82132 AND admissions.dischtime IS NULL) AND prescriptions.drug = 'sodium chloride' ORDER BY prescriptions.startdate DESC LIMIT 1