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31. A 43-year-old man has had progressive hearing loss since he began to work in a factory that makes jet engines 10 years ago. Sound does not lateralize to either ear ic the Weber test, and air conduction is greater than bone conduction in the Rinne test. Audiography shows a 40-d8 increase in hearing threshold for high-frequency sounds. Which of the following is the most likely cause of the hearing loss? A) Cell loss in the dorsal and ventral cochlear nuclei B) Damage to the basilar membrane near the apex of both cochleas C) Disruption of the ossicular chains in both ears D) Loss of hair cells near the base of both cochleas E) Scarring of both tympanic membranes

31. A 43-year-old man has had progressive hearing loss since he began to work in a factory that makes jet engines 10 years ago. Sound does not lateralize to either ear ic the Weber test, and air conduction is greater than bone conduction in the Rinne test. Audiography shows a 40-d8 increase in hearing threshold for high-frequency sounds. Which of the following is the most likely cause of the hearing loss? A) Cell loss in the dorsal and ventral cochlear nuclei B) Damage to the basilar membrane near the apex of both cochleas C) Disruption of the ossicular chains in both ears D) Loss of hair cells near the base of both cochleas E) Scarring of both tympanic membranes

Phlebotomy Essentials
Phlebotomy Essentials
6th Edition
ISBN:9781451194524
Author:Ruth McCall, Cathee M. Tankersley MT(ASCP)
Publisher:Ruth McCall, Cathee M. Tankersley MT(ASCP)
Chapter1: Phlebotomy: Past And Present And The Healthcare Setting
Section: Chapter Questions
Problem 1SRQ
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**Hearing Loss Assessment Case Study** **Case Details:** A 43-year-old man has experienced progressive hearing loss since he began working in a factory that manufactures jet engines 10 years ago. Several tests have been conducted to assess his hearing condition: - **Weber Test:** Sound does not lateralize to either ear. - **Rinne Test:** Air conduction is greater than bone conduction. - **Audiography Results:** A 40-45 dB increase in hearing threshold for high-frequency sounds. **Question:** Which of the following is the most likely cause of the hearing loss in this individual? **Options:** A) Cell loss in the dorsal and ventral cochlear nuclei B) Damage to the basilar membrane near the apex of both cochleas C) Disruption of the ossicular chains in both ears D) Loss of hair cells near the base of both cochleas E) Scarring of both tympanic membranes **Correct Answer:** **D) Loss of hair cells near the base of both cochleas** --- **Explanation:** Given the case details, the most likely cause of the described hearing loss is the loss of hair cells near the base of both cochleas. This selection aligns with the audiography findings, which show a significant increase in hearing threshold specifically for high-frequency sounds, a characteristic pattern of damage to the hair cells located at the base of the cochlea. In factory environments with high levels of noise, particularly those that manufacture jet engines, prolonged exposure to loud sounds can lead to this specific type of hearing loss, commonly known as noise-induced hearing loss (NIHL). Hair cells near the cochlear base are particularly susceptible to damage from high-frequency noise, as they are responsible for detecting these frequencies.
Transcribed Image Text:**Hearing Loss Assessment Case Study** **Case Details:** A 43-year-old man has experienced progressive hearing loss since he began working in a factory that manufactures jet engines 10 years ago. Several tests have been conducted to assess his hearing condition: - **Weber Test:** Sound does not lateralize to either ear. - **Rinne Test:** Air conduction is greater than bone conduction. - **Audiography Results:** A 40-45 dB increase in hearing threshold for high-frequency sounds. **Question:** Which of the following is the most likely cause of the hearing loss in this individual? **Options:** A) Cell loss in the dorsal and ventral cochlear nuclei B) Damage to the basilar membrane near the apex of both cochleas C) Disruption of the ossicular chains in both ears D) Loss of hair cells near the base of both cochleas E) Scarring of both tympanic membranes **Correct Answer:** **D) Loss of hair cells near the base of both cochleas** --- **Explanation:** Given the case details, the most likely cause of the described hearing loss is the loss of hair cells near the base of both cochleas. This selection aligns with the audiography findings, which show a significant increase in hearing threshold specifically for high-frequency sounds, a characteristic pattern of damage to the hair cells located at the base of the cochlea. In factory environments with high levels of noise, particularly those that manufacture jet engines, prolonged exposure to loud sounds can lead to this specific type of hearing loss, commonly known as noise-induced hearing loss (NIHL). Hair cells near the cochlear base are particularly susceptible to damage from high-frequency noise, as they are responsible for detecting these frequencies.
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