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08:51
Data Acquisition and Analysis In Brainstem Evoked Response Audiometry In Mice
Published on: May 10, 2019
[Bone conduction auditory brainstem responses in normal hearing individuals].
Vanessa Sabino de Freitas1, Kátia Freitas de Alvarenga, Marina Morettin
1Faculdade de Odontologia de Bauru, Universidade de São Paulo. vanfreitas@gmail.com
Pro-Fono : Revista De Atualizacao Cientifica
|December 22, 2006
Summary
Bone conduction auditory brainstem responses (ABR) are clinically applicable for assessing hearing loss. A normal threshold of 26.81+/-6.99dB nHL was established, requiring a 10dB correction factor for accurate diagnosis.
Area of Science:
- Audiology
- Neuroscience
- Electrophysiology
Context:
- Bone conduction auditory brainstem responses (ABR) are crucial for evaluating hearing function.
- Establishing normative data for bone conduction ABR in normal hearing individuals is essential for clinical application.
- Previous research has primarily focused on air conduction ABR, leaving a gap in understanding bone conduction ABR characteristics.
Purpose:
- To evaluate the clinical applicability of bone conduction ABR in normal hearing individuals.
- To characterize normal bone conduction ABR thresholds and latency-intensity functions.
- To determine an appropriate assessment protocol and correction factor for bone conduction ABR.
Summary:
- This study assessed 22 normal-hearing adults using air and bone conduction ABR with vibrator placement on the forehead and mastoid.
- Electrophysiological thresholds were higher with forehead placement compared to mastoid placement.
- A normal bone conduction ABR threshold of 26.81+/-6.99dB nHL was determined, with a recommended 10dB correction factor when compared to air conduction ABR.
Impact:
- The findings confirm the clinical feasibility of bone conduction ABR.
- Establishing a normal threshold and correction factor enhances diagnostic accuracy for hearing loss.
- Integrating bone conduction ABR with air conduction ABR improves the precision of hearing loss type determination.
Related Concept Videos
01:15Auditory Pathway
Auditory pathways constitute the complex neural circuits responsible for transmitting and interpreting auditory information from the peripheral auditory system to the brain. Sound waves are initially captured by the outer ear, funneled through the ear canal, and reach the tympanic membrane (eardrum). These vibrations are transmitted via the middle ear's ossicles to the inner ear's cochlea.
When viewed cross-sectionally, the cochlea reveals the scala vestibuli and scala tympani flanking the...
When viewed cross-sectionally, the cochlea reveals the scala vestibuli and scala tympani flanking the...
01:13The Cochlea
The cochlea is a coiled structure in the inner ear that contains hair cells—the sensory receptors of the auditory system. Sound waves are transmitted to the cochlea by small bones attached to the eardrum called the ossicles, which vibrate the oval window that leads to the inner ear. This causes fluid in the chambers of the cochlea to move, vibrating the basilar membrane.
01:31Hearing
When we hear a sound, our nervous system is detecting sound waves—pressure waves of mechanical energy traveling through a medium. The frequency of the wave is perceived as pitch, while the amplitude is perceived as loudness.
01:14Assessing Body Temperature - Tympanic membrane
Assessing tympanic membrane temperature involves using a tympanic membrane thermometer (TMT). Here is a step-by-step guide:
Step 1: Begin by practicing good hand hygiene to prevent the transmission of microorganisms.
Step 2: Turn on the thermometer and wait until the ready sign appears on the screen to ensure accurate measurement.
Step 3: Slide the probe cover in place to prevent cross-contamination.
Step 4: Instruct the patient to tilt their head to the side for comfort and check for cerumen...
Step 1: Begin by practicing good hand hygiene to prevent the transmission of microorganisms.
Step 2: Turn on the thermometer and wait until the ready sign appears on the screen to ensure accurate measurement.
Step 3: Slide the probe cover in place to prevent cross-contamination.
Step 4: Instruct the patient to tilt their head to the side for comfort and check for cerumen...
01:16Anatomy of the Ear
Auditory sensation, commonly called hearing, involves the transformation of sonic waves into neural impulses facilitated by the structures of the auditory organ. The prominent, flesh-like structure on the side of the head, called the auricle, directs sound waves towards the auditory canal. The auricle is often mislabeled as the pinna, a term more aligned with mobile structures like a feline's external ear. The auditory canal penetrates the cranium via the external auditory meatus of the...
01:11The Auditory Ossicles
The auditory ossicles of the middle ear transmit sounds from the air as vibrations to the fluid-filled cochlea. The auditory ossicles consist of two malleus (hammer) bones, two incus (anvil) bones, and two stapes (stirrups), one on each side. These bones develop during the fetal stage and are the ones to ossify first. They are fully mature at birth and do not grow afterward.
The aptly named stapes look very much like a stirrup. The three ossicles are unique to mammals, and each plays a role in...
The aptly named stapes look very much like a stirrup. The three ossicles are unique to mammals, and each plays a role in...