Effect of Age and Paradigm on Pediatric Sinusoidal Harmonic Acceleration Testing
Nour El-Hidek1,2,3, Jessie N Patterson1, Manuel Vicente1,4,5
1Department of Audiology, Boys Town National Research Hospital, Omaha, NE.
Insights
Sinusoidal harmonic acceleration (SHA) testing in children is feasible across various conditions. Pediatric SHA outcomes, including gain and phase, were higher than adults, indicating a need for specific pediatric normative data.
Area of Science:
- Vestibular science
- Pediatric audiology
- Ophthalmology
Background:
- Sinusoidal harmonic acceleration (SHA) is a key diagnostic tool.
- Understanding pediatric responses is crucial for accurate interpretation.
- Methodological variations may influence test outcomes.
Purpose of the Study:
- To evaluate the impact of age, position, calibration, and illuminance on SHA outcomes.
- To compare SHA results between children (6 months-5 years) and adults.
- To determine the feasibility of SHA testing under varied conditions.
Main Methods:
- Fifty-two children and 23 adults underwent SHA testing.
- Variables included parent lap vs. car seat, standard vs. default calibration, and light illuminance.
- Testing frequencies for children were 0.01, 0.04, and 0.16 Hz.
Main Results:
- SHA is feasible with varied conditions without impacting interpretation.
- Children exhibited significantly higher gain, phase, and symmetry than adults.
- No significant differences in pediatric outcomes were found related to age or position.
Conclusions:
- Pediatric SHA test outcomes are higher compared to adults.
- This supports the necessity for establishing pediatric-specific normative data.
- SHA testing can be reliably performed using a combination of tested conditions.
Purpose:
This study aims to examine the effect of age and several methodological alterations such as position (parent lap vs. car seat), calibration strategy (standard vs. default), and illuminance on sinusoidal harmonic acceleration (SHA) outcomes in children aged 6 months to 5 years.
Method:
Fifty-two healthy children, aged 6 months to 5 years, and 23 healthy adults, aged 22 to 39 years, participated. To assess the effect of light illuminance on the corneoretinal potential, adults completed SHA at 0.16 Hz immediately, 5 and 10 min after the rotary chair door was closed, and then again after 10 s of light illumination. To assess the effect of position and calibration strategy, adults completed SHA using default and standard calibration in a standard seat and in a forward seat position. In children, SHA was completed at 0.01, 0.04., and 0.16 Hz in a car seat or booster seat and in a parent's lap, if tolerated.
Results:
Gain decreased with darkness adaptation and significantly increased in response to using a light wand. In the adults, gain was higher regardless of test position using default calibration and significantly lower in forward seat position using standard calibration; however, in the pediatric group, there were no significant differences in outcomes relative to age or position. Overall, children had significantly higher gain, phase, and symmetry when compared to the adults.
Conclusions:
SHA testing is feasible using a combination of conditions without significantly affecting interpretation. Pediatric SHA test outcomes were higher compared to those of adults, supporting the need for pediatric normative data.
Related Concept Videos
01:17Characteristics of Simple Harmonic Motion
01:20Graphical and Analytic Representation of Sinusoids
The first step is measuring the peak-to-peak value, which is twice the amplitude of the sinusoid. This provides information about the maximum voltage swing of the waveform.
Secondly, the period and angular frequency are determined. The period is the time taken for one complete cycle of the waveform, while...