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Biomedical subjects

F Klingholz

Publications and source records attributed to F Klingholz.

29 records · Page 2Linked to original sources
PubMed1983

[The activity of the supraglottal sphincter during phonation].

By means of the measurement of the aperture of the upper laryngeal sphincter it is shown that the sphincter constriction increases when the pitch is lowered and/or the voice intensity is raised. The sphincter movement does not result from the action of extrinsic laryngeal muscles. Moreover, the action of the adductor muscles results in a constriction of the supraglottal sphincter. Out of this group of muscles the lateral thyroarytenoid muscle is dominant. Since it is the strongest muscle of the group of adductors, it also activates the glottal and the supraglottal sphincters, and only this muscle guarantees glottal closure at a relaxed vocalis muscle (low pitch) and/or high subglottal pressure (high intensity). EMG data acquired from the lateral thyroarytenoid muscle at phonation at various pitch levels and different voice intensities confirm the assumed muscular function. The EMG activity increases with descending pitch level and/or with increasing voice intensity.

Electromyography↗
PubMed1983

[The role of the cricopharyngeal muscle in phonation].

Intraluminal esophageal manometry has been employed to study cricopharyngeal muscular function at different pitch levels. The activity of the cricopharyngeal muscle (CP) increases continually with rising pitch but is not influenced by the vocal sound pressure level. In the lower part of the chest register, the muscular pressure is lower than the pharyngo-esophageal pressure at rest. At high pitch levels, the pressure is higher than during swallowing. The CP has a dual function: With increasing pitch, the CP cooperates synergistically with the cricothyroid muscle (CT), indicated by increasing muscular pressure in the upper esophageal sphincter. On the other hand, the CP shortens the vocal cords by rotating the cricoid cartilage in anterior direction, thus acting antagonistically to the CT.

Cricoid Cartilage↗
PubMed1979

Relation between voice sound pressure and subglottal pressure as a diagnostic cue.

Voice sound pressure and esophageal pressure amplitudes are measured for 120 subjects with and without laryngeal status. The esophageal pressure amplitudes are taken as a approximation of the subglottal pressure. The dependency of sound pressure on subglottal pressure is approximated by a nonlinear function. The slope of the function represents the pressure transformation from subglottal pressure to sound pressure at fixed vocal tract configuration. Therefore, the slope is taken as a characterization of the efficiency of the voice organ. This quantity allows rough statement about the efficiency of the voice organ (differentiation of normal, trained normal, and pathologic larynx) but does not separates voice disorders.

Adolescent↗
PubMed1976

[Functional results after radiation therapy and chordectomy for carcinoma of the vocal cord].

A report is given on the results of comparative clinical, stroboscopical and sonagraphical investigations in 40 patients who were treated on account of vocal cord carcinoma in the T1-T3 stages at the E. N. T. clinic of Jena during 1956-1973. The therapeutic treatment was institial irradiation, chordectomy, or irradiation only. Clinicomorphological changes of the healthly vocal cord were observed with nearly all procedures used. The incidence was considerably higher with iradiated patients. The best functional late results appeared after institial irradiation and irradiation. The vocal rehabilitation after chordectomy may be considered promising, too. From the results obtained we can conclude that when deciding on the selection of further medical procedure the analyses of functional late results should be taken into account, considering, of course, the stage of the disease and the greatest remedial success. The group of people mentioned should be given in any case together with tumor aftertreatment in a phoniatric follow-up, since the psychological stress present may be considerably reduced for the benefit of optimal rehabilitation.

Cobalt Radioisotopes↗