Biomaterial Database

Tympanic membrane changes resulting from different methods of transmyringeal middle ear ventilation. 1985

S Söderberg, and S Hellström, and L E Stenfors

This experimental study was designed to evaluate the morphologic changes of the tympanic membrane in the rat after different methods of transmyringeal ventilation. Artificial ventilation was obtained in two principal ways, either by making tympanic membrane perforations with delayed healing or by inserting a tympanostomy tube. Perforations occupying the upper rear quadrant of the tympanic membrane were made by diathermy or by a carbon dioxide laser with healing times of 12 to 15 days and 18 to 21 days, respectively. Compared with the healing times of perforations made by lancet (9 to 11 days), the healing pattern was considerably delayed. The structural changes of the healed tympanic membrane were minimal, but the connective tissue remained thickened for several months. Repeated insertion of tympanostomy tubes caused a remarkable thickening (30-fold) of the tubulated quadrants. The thickened tympanic membranes were characterized by a hyperplastic, dense connective tissue containing sclerotic plaques. Similar changes, though less pronounced, were also seen after reiterated myringotomies without tube insertion.

UI	MeSH Term	Description	Entries
D008297	Male		Males
D008876	Middle Ear Ventilation	Ventilation of the middle ear in the treatment of secretory (serous) OTITIS MEDIA, usually by placement of tubes or grommets which pierce the TYMPANIC MEMBRANE.	Grommet Insertion,Tympanostomy Tube Insertion,Ventilation, Middle Ear,Myringostomy,Tympanostomy,Ear Ventilation, Middle,Ear Ventilations, Middle,Grommet Insertions,Insertion, Grommet,Insertion, Tympanostomy Tube,Insertions, Grommet,Insertions, Tympanostomy Tube,Middle Ear Ventilations,Myringostomies,Tube Insertion, Tympanostomy,Tube Insertions, Tympanostomy,Tympanostomies,Tympanostomy Tube Insertions,Ventilations, Middle Ear
D011919	Rats, Inbred Strains	Genetically identical individuals developed from brother and sister matings which have been carried out for twenty or more generations or by parent x offspring matings carried out with certain restrictions. This also includes animals with a long history of closed colony breeding.	August Rats,Inbred Rat Strains,Inbred Strain of Rat,Inbred Strain of Rats,Inbred Strains of Rats,Rat, Inbred Strain,August Rat,Inbred Rat Strain,Inbred Strain Rat,Inbred Strain Rats,Inbred Strains Rat,Inbred Strains Rats,Rat Inbred Strain,Rat Inbred Strains,Rat Strain, Inbred,Rat Strains, Inbred,Rat, August,Rat, Inbred Strains,Rats Inbred Strain,Rats Inbred Strains,Rats, August,Rats, Inbred Strain,Strain Rat, Inbred,Strain Rats, Inbred,Strain, Inbred Rat,Strains, Inbred Rat
D012086	Reoperation	A repeat operation for the same condition in the same patient due to disease progression or recurrence, or as followup to failed previous surgery.	Revision, Joint,Revision, Surgical,Surgery, Repeat,Surgical Revision,Repeat Surgery,Revision Surgery,Joint Revision,Revision Surgeries,Surgery, Revision
D004564	Electrocoagulation	Procedures using an electrically heated wire or scalpel to treat hemorrhage (e.g., bleeding ulcers) and to ablate tumors, mucosal lesions, and refractory arrhythmias. It is different from ELECTROSURGERY which is used more for cutting tissue than destroying and in which the patient is part of the electric circuit.	Diathermy, Surgical,Electrocautery,Endocavitary Fulguration,Galvanocautery,Surgical Diathermy,Thermocoagulation,Fulguration, Endocavitary
D004848	Epithelium	The layers of EPITHELIAL CELLS which cover the inner and outer surfaces of the cutaneous, mucus, and serous tissues and glands of the body.	Mesothelium,Epithelial Tissue,Mesothelial Tissue,Epithelial Tissues,Mesothelial Tissues,Tissue, Epithelial,Tissue, Mesothelial,Tissues, Epithelial,Tissues, Mesothelial
D000818	Animals	Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA.	Animal,Metazoa,Animalia
D014432	Tympanic Membrane	An oval semitransparent membrane separating the external EAR CANAL from the tympanic cavity (EAR, MIDDLE). It contains three layers: the skin of the external ear canal; the core of radially and circularly arranged collagen fibers; and the MUCOSA of the middle ear.	Eardrum,Eardrums,Membrane, Tympanic,Membranes, Tympanic,Tympanic Membranes
D051381	Rats	The common name for the genus Rattus.	Rattus,Rats, Laboratory,Rats, Norway,Rattus norvegicus,Laboratory Rat,Laboratory Rats,Norway Rat,Norway Rats,Rat,Rat, Laboratory,Rat, Norway,norvegicus, Rattus
D053685	Laser Therapy	The use of photothermal effects of LASERS to coagulate, incise, vaporize, resect, dissect, or resurface tissue.	Laser Knife,Laser Scalpel,Surgery, Laser,Vaporization, Laser,Laser Ablation,Laser Knives,Laser Photoablation of Tissue,Laser Surgery,Laser Tissue Ablation,Nonablative Laser Treatment,Pulsed Laser Tissue Ablation,Ablation, Laser,Ablation, Laser Tissue,Knife, Laser,Knifes, Laser,Knive, Laser,Knives, Laser,Laser Knifes,Laser Knive,Laser Scalpels,Laser Surgeries,Laser Therapies,Laser Treatment, Nonablative,Laser Treatments, Nonablative,Laser Vaporization,Nonablative Laser Treatments,Scalpel, Laser,Scalpels, Laser,Surgeries, Laser,Therapies, Laser,Therapy, Laser,Tissue Ablation, Laser