Biomedical subjects
Publications and source records attributed to J Betka.
For the implantation of the Czech single-channel extracochlear neuroprosthesis a special surgical procedure was elaborated. The implantation was performed in four adult, postlingually deaf subjects. In one patient a successful reimplantation was performed. The authors evaluate the ability of the patients with implants to differentiate changes of simple stimulating signals.
The authors give the basic principles of the etiopathogenesis of post-traumatic stenoses of the larynx and subglottic space. Therapeutic tactics are briefly described. Three basic types of treatment are illustrated on their own observations.
The authors analyzed data in the literature on complications of laser surgery in otolaryngology. Subsequently they analyse and describe in detail the complications they observed and which they encountered after 611 laser operations. None of the described complications caused permanent damage of the patient or the attending staff. When the recommended safety provisions are respected, the authors consider laser surgery a safe surgical method.
During BERA examinations using common surface leads (forehead, mastoid process or ear lobe) wave I is not always distinct. Contrary to hitherto used methods (needle electrodes, small electrodes fixed by means of a cross-bar), the authors recommend to make wave I more distinct by use a surface electrode with a larger area (78 sq.mm). It is an open silver tube which, if necessary, is fixed in the osseous portion of the external auditory meatus by a PVC tube. Examination of 50 subjects revealed that the amplitude of wave I increased by using the electrode on an average more than four times, the thresholds of wave I in healthy subjects are practically identical as the thresholds of the V wave. The authors did not observe any effect on the thresholds and latencies of the V wave. The examined subjects tolerated the electrode well.
The paper provides information concerning basic types of lasers used in medicine. Their most frequent indications are summarized and advantages of single types of apparatus are described.
CO2 laser surgery is becoming a part of larynx surgery. The authors inform about their experience in benign larynx tumours treatment. They present analysis of concrete therapeutic procedures in individual larynx affections. They conclude that laser surgery is an advantegous method for benign larynx tumours treatment.
Inverted papilloma is a relatively rare benign tumour of nasal mucosa and paranasal sinuses which approx. in 15% is connected with malignancy. The morphology, occurrence, etiology and biological behaviour of this tumour are dealt with. A group of 8 patients is presented. The significance of nasal polyps routine histologic investigation for early detection of these tumours is stressed. Various treatment possibilities are discussed and a therapeutic procedure based on radical surgery is suggested.
A number of failures of extracochlear implants are caused by a bad contact between the active electrode and the tissue. A novel and simple method has been developed to enable the impedance of the active electrode to be measured before completion of surgery.
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