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PubMed1992

[Reflex control of laryngeal functions in the cat: the effect of vibratory stimuli of the laryngeal mucosa on the laryngeal reflex].

To investigate the effect of vibratory stimuli of the subglottic mucosa on the laryngeal reflex, experiments were performed on cats anesthetized with intraperitoneal injection of a mixture of urethane and chloralose. The external branch of the superior laryngeal nerve was cut, while the internal branch of the superior laryngeal nerve (ISLN) was mounted on stimulating electrodes. Electromyograms (EMG) were recorded from the contralateral thyreoarytenoid (TA), posterior cricoarytenoid (PCA), lateral cricoarytenoid (LCA), and cricothyreoid (CT) muscles. When the ISLN was electrically stimulated, the laryngeal reflex was induced. Short latency (early) and long latency (late) responses were observed in TA, PCA, LCA, and CT. Then, vibratory stimuli were applied to the surface of the subglottic mucosa. Vibratory frequencies used in this study were varied stepwise from 100 Hz to 400 Hz, with the amplitude adjusted at 20 microns. Vibratory stimuli had no effect on early responses but did, however, exert a facilitatory effect on late responses of TA and LCA in the transitional phase from inspiration to expiration and on late responses of PCA in the inspiratory phase. After denervation of ISLN, the vibratory effect on late responses disappeared completely. No significant vibratory effect was observed on CT in any respiratory phase. These results suggest that vibratory stimuli applied to the surface of the subglottic mucosa reflexively facilitate the laryngeal reflex and that ISLN afferents and respiratory drive modulate the laryngeal reflex.

Animals↗

PubMed1992

[Laryngeal carcinoma with laryngeal abscess].

We had encountered 5 cases of laryngeal carcinoma associated with abscess. Four of them were advanced laryngeal cancer with abscess induced by mechanical injury, and one with post-radiation laryngeal perichondritis & abscess formation. Management included total laryngectomy in 3 patients, partial laryngectomy in 1 patient, and resection of post-radiation abscess in one. Laryngeal abscesses are seen rarely today. Endeavour should be made to decrease such complication. The authors had presented their experience in the management of laryngeal carcinoma associated with laryngeal abscess, together with a review of the history and some of the current ideas about this problem.

Abscess↗

PubMedDate not supplied

Observations on laryngeal disease, laryngeal behavior and voice.

This discussion accepted the hypothesis that every laryngeal sound is produced by its unique type of vocal cord vibration. The production of vocal sound is not capricious, it follows certain laws many of which are not known. Research into the behavior of the larynx has produced some interesting and perhaps, useful findings. It was the intention of this paper to describe some of the features of laryngeal behavior as they relate to both phonation and laryngeal disorders in the belief that such knowledge lends itself to the more efficient management of certain vocal and laryngeal problems. The central theme has been that it is laryngeal behavior and not laryngeal disease itself that determines vocal deviation.

Female↗

PubMed1979

Changes in laryngeal motoneurone activity and in laryngeal calibre during the expiration reflex.

In anaesthetized and paralysed cats, the response of the laryngeal motoneurones during the expiration reflex is characterized by pronounced activation of the expiratory laryngeal motoneurones in the compressive phase and the subsequent constriction phase. In the expulsive phase the frequency of these discharges is significantly reduced. The inspiratory laryngeal motoneurones are inhibited during the reflex. The expiration reflex, in anaesthetized cats, is accompanied in the compressive phase and the subsequent constriction phase by a two-phase increase in laryngeal resistance. In the expulsive phase there is a significant drop in resistance.

Action Potentials↗

PubMed1979

Local invasion by laryngeal carcinoma--the importance of focal (metaplastic) ossification within laryngeal cartilage.

Patterns of cartilage invasion by squamous carcinoma were examined in 34 consecutive laryngectomy specimens with particular reference to selective involvement of ossified cartilage. Direct infiltration of the laryngeal framework was demonstrated in 17 cases--16 (out of 17) transglottic carcinomas and in a simgle example of a combined glottic and infraglottic tumour. The susceptibility of ossified laryngeal cartilage to tumour invasion was confirmed, and morphological studies ahve clarified the underlying mechanisms. Invasion is a largely indirect process dominated by local bone destruction by osteoclasts, operating in front of the advancing tumour. One established, carcinoma cells infiltrate and erode bone alone, and the osteoclasts disappear. Reasons for the particular susceptibility of ossified laryngeal cartilage to tumour invasion are discussed and attention is drawn to the role of the tumour-associated osteoclast activating factors such as postaglandins. Therapeutic implications of cartilage invasion are noted.

Adult↗

PubMed1979

Asbestos fibers in laryngeal tissues. Findings in two patients with asbestosis associated with laryngeal tumors.

Significant concentrations of asbestos fibers have been found in samples of laryngeal tissue from two patients with past exposure to asbestos and associated asbestosis. In one case, there was a polyp on a vocal cord and in the other one a laryngeal carcinoma. These findings could provide an indication of a local carcinogenic effect of asbestos fibers in laryngeal tissue.

Adolescent↗

PubMed1976

[Applied phoniatry. V. Laryngeal diagnosis and rehabilitation after laryngeal surgery (author's transl)].

In the last of 5 articles on the benefits of applied phoniatrics hints are given on the differentiation between laryngeal inflammations and tumours. Voice rehabiliation after laryngeal surgery (laryngofissure, partial laryngectomy, total laryngetomy) is demonstrated. Disorders of voice caused by intubation are also described.

Aphonia↗

PubMedDate not supplied

Laryngeal phonatory reflex. The effect of anesthetization of the internal branch of the superior laryngeal nerve: Acoustic aspects.

Summary--The laryngeal phonatory reflex through the internal branch of the superior laryngeal nerve (SLN) was investigated by means of anesthetization of the nerve, after which acoustic signals were subjected to computer analysis to determine how anesthesia affected basic vocal parameters. Results showed that the anesthetization did not affect the abrupt cycle-to-cycle frequency changes and also did not influence the gross control of the fundamental frequency. But slower fluctuation of the fundamental frequency increased following anesthesia. From these results, it is suggested that the anesthetization of the internal branch of the SLN may derange the fine control mechanism of the larynx without affecting overall or gross performance of the phonatory apparatus.

Humans↗

PubMed1991

[Evaluation of the healing value of Iwonicz mineral water in balneo-climatic therapy of chronic hyperplastic laryngitis with wide pachydermic changes of laryngeal mucous membrane after microsurgery by the Kleinsasser method].

The paper comprises clinical estimation of using Iwonicz mineral water Elin 7 in balneotherapy of chronic hyperplastic laryngitis after its microsurgical therapy by Kleinsasser method. Investigation in the group of 246 people showed that combined treatment, i.e. microsurgery and balneotherapy, is an effective method of healing some hyperplastic inflammatory diseases of mucous membrane of the larynx.

Adult↗

PubMed1978

Reconstruction of laryngeal function for recurrent laryngeal nerve paralysis: historical view, advancement of latest investigations and a preliminary experiment.

Historical investigations of the functional restoration for recurrent laryngeal nerve paralysis are reviewed and some advancement in recent studies are introduced. A preliminary experiment is reported in which the ansa hypoglossi and the sternothyroid muscle pedicle was implanted into the denervated posterior cricoarytenoid muscle in dogs. From these experiments we have concluded that the ansa hypoglossi and sternothyroid muscle pedicle, which has been shown to transmit efferent inspiratory bursts, is capable of restoring function to the paralyzed posterior cricoarytenoid muscle in some dogs.

Animals↗

PubMed1975

Laryngeal structure following microcauterization.

This paper supports and reaffirms the objectives of contemporary laryngology in the treatment of cancer of this organmthese objectives are, first and foremost, the eradication of the tumor, and second, the preservation of function. A relatively recent contribution to the "state of the art" has been the development of the field of microlaryngology. The introduction of the surgical microscope has provided the laryngologist with better means to judge the type, localization and extent of neoplastic lesions. Reports indicate that superficial limited carcinomas of they larynx with good vocal cord mobility can be successfully treated by vocal cord stripping and/or radiotherapy. This paper presents the serious challenge posed by these limited tumors when they recur after radiotherapy. In a selected number of these patients radical surgery has been prevented by treating these recurrent tumors with the microcautery. Some of these patients, so treated, habe been free of disease for more than three years after their recurrent tumors were destroyed with the microcautery. During this time these patients have enjoyed adequate voices.

Aged↗

PubMed1976