Acoustic Impedance Measurement in the Study of Patients with Spasmodic Dysphonia

1973 ◽  
Vol 38 (2) ◽  
pp. 250-255 ◽  
Author(s):  
Gerald N. McCall
Keyword(s):  
Middle Ear ◽  
Acoustic Impedance ◽  
Muscle Relaxation ◽  
Impedance Measurement ◽  
Spasmodic Dysphonia ◽  
Muscle Dysfunction ◽  
Neurologic Involvement ◽  
High Incidence ◽  
Neurogenic Dysfunction ◽  
Extrapyramidal Motor

The use of acoustic impedance measurement for the study of middle ear muscle dysfunction in patients with spasmodic dysphonia is advocated. Preliminary data reported here provide evidence of a high incidence of apparent middle ear muscle dysfunction in these patients. The findings appear to add further support to the theory of neurogenic dysfunction in spasmodic dysphonia. Observations of possible problems in muscle relaxation in some patients and tremor of the middle ear muscle(s) in others are interpreted as being suggestive of neurologic involvement of the extrapyramidal motor system.

Use of Acoustic Impedance Measurement in Screening for Middle Ear Disease in Children

1978 ◽  
Vol 87 (2) ◽  
pp. 288-292 ◽  
Author(s):  
Fred H. Bess ◽  
Charles D. Bluestone ◽  
Don A. Harrington ◽  
Jerome O. Klein ◽  
Earl R. Harford
Keyword(s):  
Middle Ear ◽  
Acoustic Impedance ◽  
Impedance Measurement ◽  
Middle Ear Disease

Use of Acoustic Impedance Measurement in Screening for Middle Ear Disease in Children Task Force of the Symposium on Impedance Screening for Children

PEDIATRICS ◽  
1978 ◽  
Vol 62 (4) ◽  
pp. 570-573
Keyword(s):  
Natural History ◽  
Middle Ear ◽  
Acoustic Impedance ◽  
Clinical Management ◽  
Task Force ◽  
Impedance Measurement ◽  
Infants And Children ◽  
Middle Ear Disease ◽  
In Infants And Children

The Task Force strongly encourages continued investigation of this method for detecting middle ear disease in infants and children. The Task Force does not endorse universal (mass) impedance screening at this time. Finally, the Task Force emphasizes the need for research to further clarify the epidemiology, natural history, and optimal clinical management of middle ear disease.

Acoustic Impedance Measurements in Cleft-Palate Children

1975 ◽  
Vol 40 (1) ◽  
pp. 13-24 ◽  
Author(s):  
Fred H. Bess ◽  
H. Donell Lewis ◽  
David J. Cieliczka
Keyword(s):  
Hearing Loss ◽  
Cleft Palate ◽  
Middle Ear ◽  
Acoustic Impedance ◽  
Pure Tone ◽  
Cleft Lip ◽  
Impedance Measurements ◽  
High Incidence ◽  
Middle Ear Disease

Clinical acoustic impedance findings in a group of 40 children with cleft lip or palate and a group of 20 noncleft children are presented. The cleft subjects exhibited a high incidence of hearing loss and aural pathology. The data suggest that impedance measurements lend pertinent supportive information to routine pure-tone audiometric testing in the detection and management of middle-ear disease in the cleft-palate population.

scholarly journals An Overview of Acoustic Impedance Measurement Techniques and Future Prospects

Metrology ◽  
2021 ◽  
Vol 1 (1) ◽  
pp. 17-38
Author(s):  
Nandeesh Hiremath ◽  
Vaibhav Kumar ◽  
Nicholas Motahari ◽  
Dhwanil Shukla
Keyword(s):  
Acoustic Impedance ◽  
Sound Pressure ◽  
Acoustic Pressure ◽  
Measurement Techniques ◽  
Impedance Measurement ◽  
Acoustic Medium ◽  
Future Prospects ◽  
Reverberation Chamber ◽  
Field Techniques ◽  
Acoustic Phenomenon

In order to progress in the area of aeroacoustics, experimental measurements are necessary. Not only are they required for engineering applications in acoustics and noise engineering, but also they are necessary for developing models of acoustic phenomenon around us. One measurement of particular importance is acoustic impedance. Acoustic Impedance is the measure of opposition of acoustical flow due to the acoustic pressure. It indicates how much sound pressure is generated by the vibration of molecules of a particular acoustic medium at a given frequency and can be a characteristic of the medium.The aim of the present paper is to give a synthetic overview of the literature on impedance measurements and to discuss the advantage and disadvantage of each measurement technique. In this work, we investigate the three main categories of impedance measurement techniques, namely reverberation chamber techniques, impedance tube techniques, and far-field techniques. Theoretical principles for each technique are provided along with a discussion on historical development and recent advancements for each technique.

Purulent Otitis Media—A “Silent” Source of Sepsis in the Pediatric Intensive Care Unit

1985 ◽  
Vol 93 (3) ◽  
pp. 330-334 ◽  
Author(s):  
Michael Persico ◽  
Geoffrey A. Barker ◽  
David P. Mitchell
Keyword(s):  
Intensive Care Unit ◽  
Intensive Care ◽  
Pediatric Intensive Care Unit ◽  
Middle Ear ◽  
Nasotracheal Intubation ◽  
Pediatric Intensive Care ◽  
Nasogastric Tubes ◽  
High Incidence ◽  
Risk Patients ◽  
Pediatric Icu

Septicemia is common in patients in the pediatric intensive care unit (ICU) who have nasotracheal tubes. Although it is frequently caused by middle ear effusion (MEE), pneumatic otoscopy is not routinely performed in these patients. To demonstrate the value of this procedure, 46 pediatric ICU patients with nasotracheal tubes were followed daily with pneumatic otoscopy for 11 to 98 days and compared with 25 controls without nasotracheal tubes, 12 of whom had nasogastric tubes. Myringotomy was performed whenever blood culture became positive. MEE was significantly more frequent in patients with nasotracheal tubes (87%) than in patients with controls (23%) and occurred first on the side of intubation. Blood bacteria were identical to middle ear pathogens in 80% of patients. Nasogastric tubes were not significant in causing MEE. The high incidence of MEE resulting from nasotracheal intubation indicates the importance of including pneumatic otoscopy in the daily examination of these high-risk patients.

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