Narrowest (ISTHMUS) Portion of Eustachian Tube: A Computer-Aided Three-Dimensional Reconstruction and Measurement Study

Sudo, Masaharu; Sando, Isamu; Ikui, Akihiro; Suzuki, Chiaki

doi:10.1177/000348949710600710

Cited by 55 publications

(30 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…It is possible to measure the midsagittal parameters and bilateral craniofacial antimeric parameters directly, at the same time, with this method. However, any study that involves histologic processing of specimens may produce artifacts such as shrinkage of the section (Sudo et al, 1997). Because we lack a subjects' historic ear information, it is necessary to use postmortem indicators of prior otitis media (a small extent of mastoid pneumatization and scarred tympanic membranes).…”

Section: Introductionmentioning

confidence: 99%

Craniofacial measures of chronic otitis media patients by 2D reformatted CT

et al. 2010

View full text Add to dashboard Cite

Few authors have studied differences in craniofacial morphology of adults with chronic otitis media (COM). We sought to compare the craniofacial measurements of patients with COM with otherwise healthy adults. The study group included 120 adult patients. The control group had 30 men and 30 women without evidence of otitis media; a COM group consisted of 30 men and 30 women with COM. Craniofacial measurements were assessed retrospectively using a two-dimensional reformatted CT method. Multiple linear (bony and cartilaginous auditory tube length, size of the mastoid, height of the jugular bulbus, intercochlear distance, bitemporal distance, distance between pharyngeal orifices, and some cephalometric cranial base distances), angular (auditory tube angle, cranial base angle), and area (axial and sagittal nasopharynx size) measurements were performed. In addition, petrosquamosal (Körner's) septum prevalence and size were evaluated. No statistically significant differences were found regarding craniofacial variables except mastoid size (mastoid depth and length). None of the craniofacial parameters showed significant differences between adults with COM and adults without evidence of otitis media, when age, sex, and race were considered. No statistically significant differences were found when mastoid size was compared with unilateral and bilateral COM. No statistically significant difference was found between mastoid size of the intact side and involved side of the unilateral patients with COM. Patients with unilateral and bilateral COM may be in the same group, genetically or environmentally, as far as mastoid size is concerned. Small mastoid size correlates with COM, but development of clinical disease should be under the control of different factors.

show abstract

Section: Introductionmentioning

confidence: 99%

Craniofacial measures of chronic otitis media patients by 2D reformatted CT

et al. 2010

View full text Add to dashboard Cite

show abstract

“…A group of researchers from Pittsburgh used three-dimensional computer-aided reconstructions of histological slides to accurately measure the eustachian tube dimensions. 11,12 The minimum area was consistently found in the lateral aspect of the cartilaginous portion of the eustachian tube, within 5 mm of the junctional portion, with great variation found amongst the 16 specimens. The results of the studies have been combined and are graphically represented in Figure 1.…”

Section: Introductionmentioning

confidence: 94%

Transtympanic balloon dilatation of the eustachian tube: systematic review

Jufas

Patel

2016

J. Laryngol. Otol.

View full text Add to dashboard Cite

Objective: To investigate the evidence for balloon dilatation of the eustachian tube using a transtympanic approach.Methods: A systematic search of several databases was conducted (using the search terms 'dilation' or 'dilatation', and 'balloon' and 'eustachian tube'). Only studies that used a transtympanic approach for the procedure were included. These studies were then assessed for risk of bias.Results: Three studies were included. Each of these studies was a limited case series, with two performed on human subjects and one on human cadavers. Results of safety and efficacy are conflicting. There is a high risk of bias overall.Conclusion: At present, there is a very narrow evidence base for transtympanic balloon dilatation of the eustachian tube. There are a number of advantages and disadvantages of the technique. Previously identified and theoretical safety concerns will need to be addressed thoroughly in future studies prior to wider clinical use.

show abstract

“…To analyze the protympanic space, we considered a straight line from the anterior tympanic annulus to the basal turn of the cochlea. Using this line, we took two measurements: one from the bony part of the anterior tympanic annulus to the bony part of the promontory (protympanum opening); the second measurement was made from the edge of the mucosa covering the annulus to the edge of the mucosa lining the promontory (tympanic orifice [12]) (Fig. 1).…”

Section: Methodsmentioning

confidence: 99%

“…Although the macroscopic anatomy has been described surgically [8–11], data on the volumetric status of this area are scarcely available; the only information in the literature on this regard, to our knowledge, refers to tomographic changes among diseased middle ears [6, 12–14]. A better comprehension on its volumetric changes when comparing different types of otitis media may help to understand how the dysventilation process happens, and how those changes can lead to chronic inflammatory and intractable variations in the middle ear possible.…”

Section: Introductionmentioning

confidence: 99%

A 3-D analysis of the protympanum in human temporal bones with chronic ear disease

Pauna

Monsanto

Schachern

et al. 2016

Eur Arch Otorhinolaryngol

View full text Add to dashboard Cite

Eustachian tube dysfunction is believed to be an important factor to cholesteatoma development and recurrence of disease after surgical treatment. Although many studies have described prognostic factors, evaluation methods, or surgical techniques for Eustachian tube dysfunction, they relied on the soft tissues of its structure; little is known about its bony structure – the protympanum – which connects the Eustachian tube to the tympanic cavity, and can also be affected by several inflammatory conditions, both from the middle ear or from the nasopharynx. We studied temporal bones from patients with cholesteatoma, chronic otitis media (with and without retraction pockets), purulent otitis media, and non-diseased ears, looking for differences between the volume of the protympanum, the diameter of the Eustachian tube isthmus, and the distance between the anterior tympanic annulus and the promontory. Light microscopy and 3-D reconstruction software were used for the measurements. We observed a decrease of volume in the lumen of the four middle ear diseased ears compared to the control group. We observed a significant decrease in the volume of the protympanic space in the cholesteatoma group compared to the chronic otitis media group. We also observed a decrease in the bony space (protympanum space) in cholesteatoma, chronic otitis media with retraction pockets, and purulent otitis media compared to the control group. We found a correlation in middle ear diseases and a decrease in the middle ear space. Our findings may suggest that a smaller bony volume in the protympanic area may trigger middle ear dysventilation problems.

show abstract

Narrowest (ISTHMUS) Portion of Eustachian Tube: A Computer-Aided Three-Dimensional Reconstruction and Measurement Study

Cited by 55 publications

References 10 publications

Craniofacial measures of chronic otitis media patients by 2D reformatted CT

Craniofacial measures of chronic otitis media patients by 2D reformatted CT

Transtympanic balloon dilatation of the eustachian tube: systematic review

A 3-D analysis of the protympanum in human temporal bones with chronic ear disease

Contact Info

Product

Resources

About