Publications by authors named "TE Mitchell"

Intraoperative critical events are rarely experienced by individual surgeons but are commonly experienced at a workforce level. Finding unfamiliar or unexpected pathology, anatomy, haemorrhage or an iatrogenic organ or structure injury cannot be completely eliminated in the complex surgical environment. It is vital that an appropriate, safe response to these infrequent events takes place to prevent possible further harm to patients.

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Objectives: The number of cochlear implant recipients throughout the world is set to increase markedly. Surgical diathermy used inappropriately in the head and neck region can be damaging to implant electronics and may irreversibly damage the remaining auditory neural pathways. Safety guidelines have been published but many non-implant surgeons are unaware of their existence.

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Objectives: Magnetic resonance imaging (MRI) is a standard part of a cochlear implant assessment in most centres. While there is ample literature on the temporal bone-specific imaging that is required, the role of whole brain imaging has not been as fully studied. We present the first report of the incidence of associated brain abnormalities in the whole cochlear implant population, including adults and consider their significance.

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Introduction: Cochlear implants are surgically inserted electrical devices that enable severely or profoundly deaf individuals to interpret sounds from their environment and communicate more effectively. As a result of their electrical nature, they are susceptible to electromagnetic interference and can be damaged by excessive electrical energy. Surgical diathermy is one source of such potentially damaging energy.

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Background: Bone-anchored hearing aids (BAHAs) are indicated for people with conductive or mixed hearing loss who can benefit from amplification of sound. In resource limited health care systems, it is important that evidence regarding the benefit of BAHAs is critically appraised to aid decision-making.

Objective Of Review: To assess the clinical effectiveness of BAHAs for people with bilateral hearing impairment.

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Background: A bone-anchored hearing aid (BAHA) consists of a permanent titanium fixture, which is surgically implanted into the skull bone behind the ear, and a small detachable sound processor that clips onto the fixture. BAHAs are suitable for people with conductive or mixed hearing loss who cannot benefit fully from conventional hearing aids.

Objectives: To assess the clinical effectiveness and cost-effectiveness of BAHAs for people who are bilaterally deaf.

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Objective: We report a case of infection against a background of pre-existing cranial fasciitis.

Method: Case report and review of world literature on cranial fasciitis.

Results: Cranial fasciitis of childhood is a benign condition and a rare variant of nodular fasciitis.

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We report on a horn-shaped electro-optic scanner based on a ferroelectric LiTaO(3) wafer that is capable of scanning 632.8-nm light by an unprecedented 14.88 degrees angle for extraordinary polarized light and by 4.

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We report what we believe to be the first stand-alone integrated electro-optic lens and scanner fabricated on a single crystal of Z-cut LiTaO(3). The independently controlled lens and scanner components consist of lithographically defined domain-inverted regions extending through the thickness of the crystal. A lens power of 0.

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We present a case of intracranial haemorrhage detected by ultrasound at 36 weeks gestation in a foetus who was ultimately diagnosed with severe factor V deficiency. An abnormality of the foetal heart rate, auscultated at a routine antenatal visit, prompted an investigation that led to an ultrasound examination and detection of an intracranial haemorrhage and low amniotic fluid volume. An intrauterine foetal demise was averted.

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Objective: Lifestyle changes and medical advances warrant an investigation into perceptions of elder care needs held by today's adult children (AC) and their parents.

Method: Surveys were distributed to 200 AC. Eighty AC and 102 of their parents responded.

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We describe polycatalytic assemblies, comprising one or two streptavidin molecules and two to six attached nucleic acid catalysts (deoxyribozymes), with phosphodiesterase activity. When exposed to a matrix covered at high densities with oligonucleotide substrates, these molecules diffuse through the matrix continuously cleaving the substrate at rates comparable to those of individual catalysts in solution. Rates of diffusion (movement), processivity, and resident times of assemblies can be controlled through the number of catalytic units and the length of substrate/product recognition regions.

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Malignant peripheral nerve sheath tumors are uncommon lesions that occasionally affect the head and neck. We describe 2 new cases of head and neck pathology. One tumor involved the parotid gland and resulted in erosion of the temporal bone, and the other affected the lower lip.

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The preauricular sinus is a not uncommon finding in the paediatric population. Recent reports have added to our knowledge of this benign malformation. We review the current literature with respect to the aetiology of the condition, its clinical features, and associations with other congenital malformations.

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A new single-tilt technique for performing TEM stereomicroscopy of strain fields in crystalline materials has been developed. The technique is a weak beam technique that involves changing the value of g and/or s g while tilting across a set of Kikuchi bands. The primary benefit of the technique is it can be used with single-tilt TEM specimen holders including many specialty holders such as in situ straining, heating, and cooling holders.

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We report herein a set of deoxyribozyme-based logic gates capable of generating any Boolean function. We construct basic NOT and AND gates, followed by the more complex XOR gate. These gates were constructed through a modular design that combines molecular beacon stem-loops with hammerhead-type deoxyribozymes.

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Tympanometry is well established as a useful tool in the field of otological diagnosis. There have been sporadic reports, however, of bizarre tympanograms in the presence of small perforations of the tympanic membrane. A model of the outer and middle ears was fabricated which was able to produce normal and pathological tympanograms.

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Sickle cell anaemia, a chronic and often debilitating disease, results from homozygosity for a single amino acid substitution in the beta-globin subunit of the haemoglobin molecule. Sickle haemoglobin (HbS), the product of this mutation, polymerises when deoxygenated, thus damaging the red blood cell and causing vaso-occlusive complications and haemolytic anaemia. Most cases of sickle cell anaemia are found in Africa.

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Objective: To describe an atypical waveform, termed an abnormal positive potential (APP), on round window electrocochleograms (RW ECochG) of children and to relate its occurrence to clinical history.

Study Design: APPs were identified prospectively, and a retrospective analysis was made of these patients' clinical histories, audiograms, and auditory outcomes (hearing aid, cochlear implant, or nonauditory communication)

Setting: Tertiary referral teaching hospital, day surgery and clinics.

Patients: All 431 children <110 months of age suspected of a severe to profound hearing loss who underwent RW ECochG from January 1993 to August 1997.

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The speech perception and speech production performance following cochlear implantation of congenitally deaf children and children deafened by meningitis were analysed. Three groups consisting of 70 congenitally deaf children, 22 children deafened by meningitis before two years of age and 14 children deafened by meningitis after two years of age were compared. The group deafened by meningitis after two years of age demonstrated significantly better speech perception than the other two groups.

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A new cochlear implant (CI-24M) has recently been released by Cochlear Ltd. The shape and size of the receiver-stimulator differs from that of the CI-22M. Infants as young as one year of age are now receiving cochlear implants.

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This is the first reported case of a laryngocoele developing after laryngeal trauma. A 26-year-old man sustained a shotgun injury to his larynx. A large number of shotgun pellets was removed from his left vestibular fold.

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