###HUMAN: count the number of patients whose year of death is less than or equal to 2186 and diagnoses long title is hyperacusis?, ###ASSISTANT: SELECT COUNT(DISTINCT demographic.subject_id) FROM demographic INNER JOIN diagnoses ON demographic.hadm_id = diagnoses.hadm_id WHERE demographic.dod_year <= "2186.0" AND diagnoses.long_title = "Hyperacusis"