International Journal of Otolaryngology / 2012 / Article / Tab 5

Clinical Study

Clinical Experience of Auditory Brainstem Response Testing on Pediatric Patients in the Operating Room

Table 5

Potential factors affecting ABR outcomes in the operating room.

Potential effects on ABR

Surgical-related factorsSurgical procedures Temporary shift in thresholds
Middle ear effusion Elevation of thresholds
Use of anesthesia medication Poor ABR recording

Equipment-related factorsPower source 60 Hz interference on ABR recording
Medical devices used in the operating room Electromagnetic interferences
Patients’ own medical devices Electromagnetic interferences
High level background noisesElevation of low-frequency ABR thresholds

Patients’ physiologic and neurologic statusChanges in blood oxygen level, blood pressures and body temperature, and so forth.Poor ABR waveforms, delays in ABR latencies, and reduction of ABR amplitude.

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