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PubMed: 0165-5876
Ectopic cervical thymus: Is empiric surgical excision necessary?
Schloegel LJ, Gottschall JA Related Articles Ectopic cervical thymus: Is empiric surgical excision necessary? Int J Pediatr Otorhinolaryngol. 2008 Dec 29; Authors: Schloegel LJ, Gottschall JA Ectopic cervical thymus (ECT) is an uncommon cause of pediatric neck masses. We present the first algorithm for conservative management of this benign disease. The natural history of ECT is unclear since most cases in the literature have undergone surgical excision. This is due to concern for malignant transformation, however, no convincing evidence was found in the literature to support this. With accurate diagnosis, clinically asymptomatic patients can be conservatively managed, as the thymus is expected to involute naturally. PMID: 19117616 [PubMed - as supplied by publisher]
The effect of increased inner ear pressure on tympanic membrane vibration.
Jang CH, Park H, Choi CH, Cho YB, Park IY Related Articles The effect of increased inner ear pressure on tympanic membrane vibration. Int J Pediatr Otorhinolaryngol. 2008 Dec 29; Authors: Jang CH, Park H, Choi CH, Cho YB, Park IY BACKGROUND & OBJECTIVE: It has been suggested that increased inner ear pressure can affect the stiffness of the tympano-ossicular conductive system. However, the published literature contains few studies on changes of middle ear mechanics caused by increased inner ear pressure. In this study, we evaluated the effects of increased inner ear pressure on tympanic membrane vibration in guinea pigs using a laser Doppler vibrometer (LDV). MATERIALS AND METHODS: We used 10 male guinea pigs (weighing 250g each) with normal eardrums and Preyer reflexes were used for the experiment. Inner ear pressure was modified by two approaches-directly via a tube placed in the inner ear (n=5) and indirectly via a tube placed in the subaracnoid space (n=5). Slow uniform pressure (mul/min) was infused until constant pressure was maintained. At this time, an artificial endolymph or perilymph was injected with a constant pressure of 100 and 300mmH2O. We measured the umbo velocity using a LDV. RESULTS: A positive pressure load decreased the umbo vibration at low frequencies but did not change the umbo vibration at mid and high frequencies. The umbo velocity had a greater reduction for an endolymphatic pressure load than for a perilymphatic pressure load. The largest change in velocity was noted at a frequency of 0.1kHz. There was no significant change in velocity at higher frequencies, except for 5kHz. CONCLUSION: LDV is a good tool to analyze middle ear function and it has the potential indirectly to diagnose an increase in endolymphatic or perilymphatic pressure. PMID: 19117615 [PubMed - as supplied by publisher]
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Ectopic cervical thymus: Is empiric surgical excision necessary?
Schloegel LJ, Gottschall JA Related Articles Ectopic cervical thymus: Is empiric surgical excision necessary? Int J Pediatr Otorhinolaryngol. 2008 Dec 29; Authors: Schloegel LJ, Gottschall JA Ectopic cervical thymus (ECT) is an uncommon cause of pediatric neck masses. We present the first algorithm for conservative management of this benign disease. The natural history of ECT is unclear since most cases in the literature have undergone surgical excision. This is due to concern for malignant transformation, however, no convincing evidence was found in the literature to support this. With accurate diagnosis, clinically asymptomatic patients can be conservatively managed, as the thymus is expected to involute naturally. PMID: 19117616 [PubMed - as supplied by publisher]
The effect of increased inner ear pressure on tympanic membrane vibration.
Jang CH, Park H, Choi CH, Cho YB, Park IY Related Articles The effect of increased inner ear pressure on tympanic membrane vibration. Int J Pediatr Otorhinolaryngol. 2008 Dec 29; Authors: Jang CH, Park H, Choi CH, Cho YB, Park IY BACKGROUND & OBJECTIVE: It has been suggested that increased inner ear pressure can affect the stiffness of the tympano-ossicular conductive system. However, the published literature contains few studies on changes of middle ear mechanics caused by increased inner ear pressure. In this study, we evaluated the effects of increased inner ear pressure on tympanic membrane vibration in guinea pigs using a laser Doppler vibrometer (LDV). MATERIALS AND METHODS: We used 10 male guinea pigs (weighing 250g each) with normal eardrums and Preyer reflexes were used for the experiment. Inner ear pressure was modified by two approaches-directly via a tube placed in the inner ear (n=5) and indirectly via a tube placed in the subaracnoid space (n=5). Slow uniform pressure (mul/min) was infused until constant pressure was maintained. At this time, an artificial endolymph or perilymph was injected with a constant pressure of 100 and 300mmH2O. We measured the umbo velocity using a LDV. RESULTS: A positive pressure load decreased the umbo vibration at low frequencies but did not change the umbo vibration at mid and high frequencies. The umbo velocity had a greater reduction for an endolymphatic pressure load than for a perilymphatic pressure load. The largest change in velocity was noted at a frequency of 0.1kHz. There was no significant change in velocity at higher frequencies, except for 5kHz. CONCLUSION: LDV is a good tool to analyze middle ear function and it has the potential indirectly to diagnose an increase in endolymphatic or perilymphatic pressure. PMID: 19117615 [PubMed - as supplied by publisher]
Sites:
Cincinnati Children's Hospital Medical Center Pediatric Otolaryngology - Head and Neck Surgery Department: Cincinnati Children's Hospital Medical Center Pediatric Otolaryngology / Head and Neck Surgery specialists medically or surgically treat the ear, nose, throat and related structures.Dr. Greene.com - Ear Tube Surgery for Ear Infections: Is ear tube surgery necessary? Dr. Greene explains when the use of this temporary, extra eustachian tube should be considered.
Henry A. Milczuk, MD, Pediatric Otolaryngology, Oregon Health Sciences University: The Department of Otolaryngology/Head and Neck Surgery at OHSU provides complete otolaryngology care for children and adults.
Pediatric Otolaryngology: Western Florida practice exclusively dedicated to the care of congenital or acquired ear, nose and throat disorders in children and adosescents
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