A 62-year-old man presents with progressive bilateral high-frequency hearing loss over 10 years. Audiogram shows a characteristic 'ski-slope' pattern with air-bone gap absent. Which is the most common cause of this audiometric finding?

Explanation

## Presbycusis: The Most Common Cause of Age-Related Sensorineural Hearing Loss ### Audiometric Pattern **Key Point:** Presbycusis presents with a characteristic **'ski-slope' or 'descending' audiogram** — normal or near-normal hearing at low frequencies (125–500 Hz) with progressive high-frequency hearing loss (3000–8000 Hz). **High-Yield:** This is a **sensorineural hearing loss** (no air-bone gap), distinguishing it from conductive pathology. ### Epidemiology & Pathophysiology - **Most common cause** of hearing loss in the elderly (age >60 years) - Multifactorial: cochlear hair cell degeneration, strial atrophy, and neural presbycusis - Bilateral, symmetrical, progressive - Age-related; cumulative effect of noise exposure, genetics, and metabolic factors ### Comparison with Other Causes | Feature | Presbycusis | Otosclerosis | Acoustic Neuroma | Chronic Otitis Media | |---------|-------------|--------------|------------------|---------------------| | **Audiogram** | Bilateral ski-slope (high-freq loss) | Carhart notch at 2 kHz; conductive or mixed | Unilateral; variable pattern | Conductive or mixed; air-bone gap present | | **Air-bone gap** | Absent (SNHL) | Present (conductive/mixed) | Absent (SNHL) | Present (conductive) | | **Age of onset** | >60 years | 20–40 years | 40–60 years | Any age | | **Bilaterality** | Bilateral, symmetrical | Often bilateral (30–50%) | Usually unilateral | Variable | | **Associated findings** | None | Tinnitus, vertigo | Tinnitus, vertigo, facial nerve involvement | Otorrhea, perforation, conductive loss | **Clinical Pearl:** The ski-slope pattern is **pathognomonic for presbycusis** when bilateral, symmetrical, and age-appropriate. It reflects the cochlea's vulnerability to high-frequency sound transduction. ### Why This Is High-Yield **Mnemonic: PRESBYCUSIS** — **P**rogressive, **R**elated to age, **E**lderly, **S**ki-slope audiogram, **B**ilateral, **Y**ear-on-year decline, **C**ochlear degeneration, **U**sually no vertigo, **S**ensorineural, **I**rreversible, **S**ymmetrical. **Tip:** When you see "progressive bilateral high-frequency SNHL in an elderly patient," think **presbycusis first**. It is the single most common cause of hearing loss worldwide.