Interinterpreter variability in determining the SP/AP ratio in clinical electrocochleography

Area of Science:

• Audiology
• Neuroscience
• Medical Diagnostics

Background:

• Electrocochleography (ECoG) is crucial for diagnosing auditory disorders.
• Accurate calculation of the summating potential/action potential (SP/AP) ratio is essential for ECoG interpretation.
• Identifying the precise peak of the SP waveform is critical for reliable SP/AP ratio calculation.

Purpose of the Study:

• To assess the inter-interpreter variability in calculating the SP/AP ratio from electrocochleography tracings.
• To determine if waveform difficulty influences the consistency of SP/AP ratio measurements.
• To investigate the impact of inconsistent SP/AP ratio calculations on clinical practice and research.

Main Methods:

• Fifty electrocochleography tracings were distributed to ten audiologists, totaling 500 tracings.
• Tracings were categorized by difficulty: 'easy', 'somewhat difficult', 'very difficult', and 'no response'.
• Inter-interpreter differences in SP/AP ratios were statistically analyzed using analysis of variance.

Main Results:

• High ranges and standard deviations were observed in the calculated SP/AP ratios.
• Statistically significant differences in SP/AP ratios were found in the 'very difficult' and 'no response' groups.
• Substantial inter-interpreter variability exists in SP/AP ratio calculations from identical ECoG tracings.

Conclusions:

• Significant inter-observer variability exists in SP/AP ratio calculations during electrocochleography.
• This variability poses challenges for consistent clinical patient management.
• Inconsistent SP/AP ratio measurements can affect the reliability of investigational projects in audiology.