AIIMS Bhuvneshwar NO- 2018
Medical & Surgical Nursing
Easy
In Weber's test, lateralization of sound to diseased ear indicates?
Appeared in: AIIMS Bhuvneshwar NO- 2018
Explanation
- Weber's test uses a tuning fork placed on the midline of the skull to assess and compare hearing between the two ears.
- In conductive hearing loss, the sound vibrations conducted through the bone are perceived as louder in the affected (diseased) ear.
- This phenomenon occurs because the conductive blockage (in the outer or middle ear) masks ambient room noise, making the bone-conducted sound more prominent on that side.
Why Other Options Were Wrong
- Option A: In sensorineural deafness, the inner ear or auditory nerve is damaged. Therefore, the sound is perceived as louder in the unaffected (healthy) ear, not the diseased one.
- Option B: Tympanic deafness refers to hearing loss from issues with the tympanic membrane (eardrum). While this is a cause of conductive hearing loss, 'Conductive deafness' is the broader and more appropriate diagnostic category for the test result.
- Option D: In mixed hearing loss (a combination of conductive and sensorineural), the results of Weber's test are unpredictable. The sound may lateralize to either ear or not at all, depending on the severity of each component.
Related Visual
- Visual 1: Diagram: An illustration of the Weber test showing the tuning fork on the forehead, with arrows indicating sound lateralizing to the left ear (for left-sided conductive loss) versus the right ear (for left-sided sensorineural loss).
- Visual 2: Flowchart: A decision tree showing how to interpret the combined results of Weber's and Rinne's tests to diagnose normal hearing, conductive loss, or sensorineural loss.
- Visual 3: Anatomical Chart: A cross-section of the ear highlighting the structures involved in conductive hearing (ear canal, eardrum, ossicles) versus sensorineural hearing (cochlea, auditory nerve).
Clinical Relevance
- Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Interpretation of Weber's test for differentiating types of hearing loss as background academic context rather than a clinical decision trigger.
- The Weber test is a fundamental bedside screening tool for nurses and physicians to quickly differentiate between conductive and sensorineural hearing loss, guiding further management.
- A finding of conductive loss may prompt an examination for reversible causes like cerumen (earwax) impaction, otitis media (middle ear infection), or a foreign body.
- A finding of sensorineural loss is more concerning for permanent damage and necessitates an urgent referral to an ENT specialist or audiologist for formal testing and investigation of underlying causes (e.g., noise exposure, ototoxicity, acoustic neuroma).
How to Approach the Question
- First, identify the clinical test mentioned: Weber's test, which involves placing a tuning fork on the midline of the head.
- Next, identify the specific finding described: the sound 'lateralizes' (is heard louder) in the 'diseased' ear.
- Recall the core principle of the Weber test: In a conductive hearing loss, the sound is heard louder in the affected ear. In a sensorineural hearing loss, it is heard louder in the unaffected ear.
- Apply this rule to the question. Lateralization to the diseased ear directly corresponds to the definition of a conductive hearing loss.
- Eliminate the other options. Sensorineural loss would lateralize to the good ear. Mixed loss gives variable results.
Concept Tested & Keywords
- Concept Tested: Interpretation of Weber's test for differentiating types of hearing loss.
- Stem keywords: Weber's test, lateralization, diseased ear
- Lead-in keywords: indicates
- Negative lead-in flag: false
Question ID
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