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Biomedical subjects

P Dejonckere

Publications and source records attributed to P Dejonckere.

At least 19 recordsLinked to original sources
PubMed2005

[Perceptive evaluation of substitution voices: the I(I) NFVo rating scale].

OBJECTIVES: Evaluation of a perceptual specific rating scale for specific severe non laryngeral dysphonia. MATERIAL AND METHOD: 113 speech samples from substitution voices were scored perceptually according to the IINFVo scale: overall quality impression (I), impression of Intelligibility (I), additive and unnecessary noise (N), speech fluency (F) and presence of voiced segments (Vo). Each parameter was scored on a visual analogue scale from 0 (minimally deviant) to 10 (maximally deviant substitution voicing). These samples were presented to semi-professional jury-members (second grade speech therapy students) and professional jury-members (phoniatricians and speech therapists, specialised in the oncological field). RESULTS: Interindividual agreement between semi-professionals was moderate (0.57-0.68). Interindividual agreement between professionals was higher (0.82-0.86). These figures are similar or even better compared to the classical perceptual evaluation scale for laryngeal speech (GRBAS). CONCLUSION: Our study suggests that the I(I)NFVo rating scale is suitable for perceptual evaluation of substitution voicing and consistency results are comparable with the classical perceptual rating scale (GRBAS).

Humans↗
PubMed1984

[Personal experience in reconstructive subtotal laryngectomy using a sliding epiglottoplasty].

Seven near total reconstructive laryngectomies with epiglottoplasty have been performed by the members of the Saint-Luc ( UCL ) Department of Otolaryngology. The technical aspects are described and the indications and limitations of this procedure are discussed. There is no postoperative complications and the functional results are excellent. The authors think that this procedure must find a place for surgical treatment of laryngeal neoplasms.

Aged↗
PubMed1981

Mechanism of initiation of oscillatory motion in human glottis.

Phonatory onsets of 17 normal subjects under usual speech conditions were investigated by measuring the cross-sectional area of the glottic aperture, using a photoelectric device. During a normal soft or breathy onset of phonation, the vocal fold vibration begins with an open glottis; the pattern of the optical signal is a sine wave of increasing amplitude with one to eight cycles before steady state oscillation is achieved. The first deflection of the base-line is either towards adduction or towards abduction. The classically assumed--since van den Berg et al. (1957)--retro-aspiration phenomenon, consisting in a narrowing of the glottic chink due to the accelerated air flow, according to Bernoulli's law, is incompatible with these observations. An aerodynamic study, with accurate calibration of the photoelectric transducer in one trained subject, as well as flux and subglottic pressure measurements, suggests that the gas flux (air as well as a helium-oxygen mixture) reaches the condition of turbulence at the level of the glottic nozzle, just before vocal folds are set into oscillatory motion. The setting in motion of the free edge of the vocal folds in normal soft or breathy onset of phonation can be explained by a sudden modification of flow conditions within the expiratory gas : the flow is laminar in the trachea and suddenly becomes turbulent at the level of the glottic nozzle. On the other hand, approximately normal atmospheric pressure values are attained due to a Bernoulli-effect at that level, allowing the vocal folds to oscillate sinusoidally about their vibration axes, corresponding to their virtual resting position, like a forced oscillator.

Air↗
PubMed1980

[Phase relationship between dynamics of the subglottic pressure and oscillatory movement of the vocal folds. I. Sustained phonation].

The phase relationship between subglottic pressure and vocal fold length has been studied during sustained phonation in five subjects with normal larynx. Pressure was measured by tracheal puncture and vocal fold length was deduced from simultaneous measurement of translaryngeal impedance in the horizontal plane and transglottal light flux in the vertical plane. The pressure sine wave shows a phase lead of slightly less than 90 degrees relative to the length sine wave. Thus during sustained phonation the vocal apparatus behaves like a harmonic oscillator; the frequency of oscillation is determined by the mechanical parameters of the vibrating system; the source of periodic energy supply is the subglottal pressure wave.

Glottis↗
PubMed1980

[Phase relationship between dynamics of the subglottic pressure and oscillatory movement of the vocal folds. II. Vocalic attach and end of emission].

Vocal fold length and subglottic pressure were measured both during the beginning and ending of phonation in five normal subjects. Whatever the type of vocalic attack, the subglottic pressure sine wave leads the vocal fold length sine wave by slightly less than 90 degrees. At the end of emission, the vibrator behaves like a damped harmonic oscillator; its damping factor is significantly smaller than values obtained from excised larynges. A model is proposed for the vocal vibrator, namely a damped harmonic oscillator which, once set into motion, is activated and maintained in oscillation by an extrinsic periodic force, the subglottic pressure, the phase lead of which is related to the damping factor.

Glottis↗
PubMed1980

[Etiology of neurogenic laryngeal lesions diagnosed by electromyography].

An homogeneous series of fifty cases of neurogenic pathology of the larynx was analysed with regard to the etiologic factors. All the patients had a pathologic electromyography at the level of laryngeal muscles. Findings are compared with data from the literature about clinical laryngeal paralysis. This points out the importance to include an electromyographic examination in the investigation of this pathology.

Adolescent↗
PubMed1980

[Effects of phoniatric therapy on the phonetogram].

A phonetogram was performed in 38 patients at the beginning and at the end of a phoniatric treatment for voice disorder, with for each case, a part of functional voice therapy. Average values are markedly positive for the F0-range, the loudness-dynamics, and the phonatory area. Some interesting physio-pathological conclusions may be deduced from a comparison with the phonatory coefficient, and with the acoustical analysis of usual voice.

Female↗