All of the following clinical findings are characteristic of conductive hearing loss EXCEPT:

Explanation

## Conductive vs Sensorineural Hearing Loss: Clinical Differentiation ### Characteristic Features of Conductive Hearing Loss **Key Point:** In conductive hearing loss, the inner ear (cochlea) and neural pathways are intact; the problem lies in sound transmission through the external or middle ear. ### Weber and Rinne Test Findings | Test | Conductive HL | Sensorineural HL | |------|---|---| | **Weber** | Lateralizes to affected (bad) ear | Lateralizes to normal (good) ear | | **Rinne** | Bone > Air (BC better than AC) | Air > Bone (AC better than BC) | | **Bone Conduction** | Normal/near-normal thresholds | Elevated thresholds | **High-Yield:** In conductive loss, bone conduction bypasses the middle ear defect and reaches a normal cochlea, so BC thresholds remain normal. Air conduction is impaired because sound cannot reach the cochlea efficiently through the damaged conduction pathway. ### Why Speech Discrimination is Preserved **Clinical Pearl:** Speech discrimination (ability to understand words at comfortable listening level) is **normal or near-normal** in pure conductive hearing loss because the cochlea and auditory nerve are functioning normally. Once sound reaches the cochlea (via bone conduction or amplification), clarity is preserved. **Key Point:** Reduced speech discrimination indicates cochlear or retrocochlear pathology (sensorineural loss), not conductive loss. ### The Distractor Option 4 ("Speech discrimination score is reduced") is the **exception** — this finding is characteristic of **sensorineural** hearing loss, where the cochlea or auditory nerve is damaged. In conductive loss, discrimination remains excellent because the sensory apparatus is intact. --- ## Summary Table: Conductive vs Sensorineural | Feature | Conductive | Sensorineural | |---------|-----------|---------------| | Weber lateralization | To affected ear | To normal ear | | Rinne result | BC > AC | AC > BC | | Speech discrimination | Normal | Reduced | | Bone conduction threshold | Normal | Elevated | | Cause | External/middle ear | Cochlea/nerve | **Mnemonic:** **CONDUCTIVE = CLEAR when amplified** — because the sensory end-organ is healthy.