Biomedical subjects

A Jolk

Publications and source records attributed to A Jolk.

4 recordsLinked to original sources

PubMed1994

[Fine mesh metal endoprostheses for treatment of extensive cervical and intrathoracic tracheomalacia].

The treatment of tracheal stenoses caused by tracheomalacia is mainly carried out by means of sleeve resection, tracheopexy with ring support or other tracheoplastic operative procedures. If patients cannot be treated by surgical operative strategies, conventional stents are usually used to dilate the trachea. The use of a self-expanding elastic metal prosthesis in 5 patients with tracheal airway obstruction caused by tracheomalacia proved to be a true alternative in the therapy of tracheobronchial stenoses. We report on the long term use of 5 patients with tracheal stenoses treated by implantation of elastic metal wallstents. The implantation of the stents resulted in immediate improvement in respiratory function in all 5 patients. None of the patients experienced complications secondary to the stent placement. The stents were well tolerated (long-time follow-up 26 months). The implantation of self-expanding metal stents type "wallstent" seems to offer alternative possibilities for the treatment of tracheomalacia.

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PubMed1993

[Expandable metal mesh stents for treatment of tracheal stenoses and tracheomalacia].

The treatment of tracheo-bronchial stenosis or tracheomalacia is mainly carried out by means of resection or tracheoplastic operative strategies. Since the introduction of metal-mesh stents, a definitive endoluminal therapy has to be considered under new aspects. Six patients with malignant stenosis or tracheomalacia due to compression were treated by implantation of Palmaz- or Wallstents. Immediately after the implantation, patients were relieved from dyspnoea, the forced inspiratory volume-1 (FIV1) was normalized. All implanted stents were well tolerated, even in the long-time follow-up (19 months). Bronchoscopic control showed overgrowth of the metal meshes by respiratory epithelium. The implantation of metal-mesh stents is an adequate alternative in the treatment of malignant stenosis and tracheomalacia.

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PubMed1986

[The 3-dimensional voice field].

Extension of the voice field (voice profile) by a third variable which characterizes the phonation has various advantages as well as drawbacks. Since the voice field evaluates the laryngeal function, the use of aerodynamic variables improve the representation of the laryngeal efficiency in the voice field. On the other hand, the measurement of these variables complicates the method. When voice quality measures (presence of singing formant, sharpness) are used as the third dimension, the limits of the voice field are unique references for the measures. However, the voice quality at the physiologic limits is not representative of the voice as produced in singing or speaking. Measures which characterize the "hoarseness" of the voice yield important results with respect to the perturbation of the voice production (jitter, shimmer, additive noise). The perturbation measures evaluate the laryngeal function at defined points in the frequency--intensity area. However, in forte phonation, the natural perturbation is reduced, in piano phonation, the perturbation is increased, and the results cannot be interpreted in relation to the perturbation magnitude within the voice field. Besides, the measurement of perturbation requires digital signal processing. If EMG data are used for the voice field, as it is shown for the M. vocalis, the voice field reveals interesting relationships between acoustic and physiologic features. For instance, in the piano phonation, the EMG signal power is constant on a low level. In the forte phonation, in the chest register, the EMG signal power shows a medium level and a high level in the head register. In the falsetto, however, the EMG signal power is low.(ABSTRACT TRUNCATED AT 250 WORDS)

Electromyography↗

PubMedDate not supplied

[Self-expandable prosthesis for the management of cervical and thoracic tracheomalacia].

Four patients afflicted of cervical and thoracic tracheomalacia have been treated with self-expandable and elastic metal prosthesis. The implantation of this prosthesis resulted in immediate improvement of the respiratory function. Long-term follow-up of these patients (24 months) showed a very good evolution. In this paper we describe the prosthesis features, the implantation technique as well as the radiological and endoscopic results.

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