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Biomedical subjects

L Schalén

Publications and source records attributed to L Schalén.

At least 19 recordsLinked to original sources
PubMed1998

Etiology and treatment of psychogenic voice disorder: results of a follow-up study of thirty patients.

It is generally accepted that psychogenic voice disorder (PVD) is a result of psychosocial stress; however, systematic studies of etiological factors in this condition are few. Furthermore, although immediate effects of therapy are estimated to be good, relapses are frequent, and the long-term effects of therapy are not known. The present prospective and longitudinal study on 30 patients was thus focused on possible etiological factors, the course of therapy, and the long-term results of therapy for PVD. The results indicate that interpersonal conflicts related to family and work are of basic importance in precipitating this condition. PVD is interpreted as a specific disorder of verbal emotional expression. Our therapy model in which vocal exercises are performed, together with training of communicative skills, seems rewarding. Relapses were not reported in 88% of the patients during the followup period of 1.9-8.4 years after therapy.

Adolescent↗
PubMed1995

Voice evaluation before and after laser excision vs. radiotherapy of T1A glottic carcinoma.

Quality of voice after treatment for T1A glottic squamous cell carcinoma was studied in two matched groups of males treated either with CO2 laser cordectomi (n = 18, mean age 65.2 years) or with full dose radiotherapy (n = 18, mean age 65.1 years). All patients had histologically verified invasive squamous cell carcinoma. Fifteen male patients (mean age 63.9 years) without laryngeal disorders were used as controls. Voice recordings prior to treatment, and both at 3 months and at 2 years after completed treatment were analyzed. Acoustic measures of shimmer, jitter, breathiness, harmonic-to-noise ratio and fundamental frequency (F0) average were calculated with the Soundscope program. Two plain measures were also used: time required to read a running speech voice sample, and number of breaths. Perceptual voice analysis was performed blindly by two groups of listeners, Group A (4 experienced listeners) and Group B (4 naive listeners). Group A estimated quality of voice according to a modified GRBAS score, whereas Group B estimated Grade only. We found voice quality both at 3 months and at 2 years after radiotherapy to be significantly better than after laser treatment, as assessed by the acoustic variables breathiness, jitter, F0 average, running speech voice sample reading time and number of breaths. The perceptual variables Grade (Group A and B), Breathiness, Asthenia and Strain were also significantly better after radiotherapy.

Adult↗
PubMed1993

Language development in children with recurrent acute otitis media during the first three years of life. Follow-up study from birth to seven years of age.

From a cohort of 113 children, followed prospectively from birth during the first three years of life regarding different aspects of acute otitis media (AOM), two study groups were selected for the present investigation: 13 children with recurrent AOM (rAOM, i.e. at least six episodes of AOM during a 12-month period), and 29 children without any AOM episode. The purpose of this study was to analyse the possible effects of early onset rAOM on language development as assessed at four and seven years of age at phoniatric and linguistic examinations performed blindly. There were no differences between the two groups on any of the linguistic analyses performed, although the rAOM group manifested a somewhat better performance on auditory discrimination tests at four years of age. The results of the present study show that rAOM during the first three years of life, in otherwise healthy children, does not cause a detectable delay of language development at four and seven years of age.

Acute Disease↗
PubMed1993

Erythromycin in acute laryngitis in adults.

Moraxella catarrhalis and Hemophilus influenzae are isolated from the nasopharynx in 50% to 55% and 8% to 15%, respectively, of cases of acute laryngitis in adults. This finding indicates that these organisms, M catarrhalis in particular, are in some way involved in the pathogenesis of the disorder. In the present double-blind, placebo-controlled trial, the effect of erythromycin ethylsuccinate (0.5 g twice a day for 5 days) on the elimination of nasopharyngeal pathogens and reduction of clinical signs of upper respiratory tract infection, as well as on subjective complaints, was evaluated in 106 adults with acute laryngitis. The bacterial isolation rates at presentation were M catarrhalis 50%, H influenzae 18%, and Streptococcus pneumoniae 4%. In the 99 patients who completed the study, the elimination of M catarrhalis after 1 week was better in the erythromycin group (25 of 30 cases) than in the placebo group (6 of 19 cases; p < or = .00038). The elimination of H influenzae was unaffected by erythromycin. Otolaryngologic examination did not reveal any significant group differences regarding laryngitis, pharyngitis, or rhinitis. Voice quality was improved after 1 week, irrespective of treatment. However, as compared to the placebo group, the erythromycin group reported fewer voice complaints after 1 week and fewer coughing complaints after 2 weeks. As acute laryngitis in adults is self-limiting, and subjective symptoms are spontaneously reduced after 1 week in most cases, antibiotic treatment does not seem warranted as a general policy. However, erythromycin may be justified in patients who are professionally dependent on voice function.

Acute Disease↗
PubMed1992

Differential diagnosis and treatment of psychogenic voice disorder.

Forty consecutive patients with psychogenic voice disorder were studied prospectively to shed light on some problems of differential diagnosis met by the otolaryngologist. The females (n = 35) were on average younger than males (n = 5) (mean age 34.5 vs 51.8 years, respectively). Although an upper respiratory tract infection preceding the voice disorder was reported by no more than 25% of the patients, as many as 40% had been treated with antibiotics on one or more occasions. Other treatment and voice rest had been prescribed to a further 20% of the patients. The frequency rate of reported asthma/allergy-like symptoms (37.5) exceeded the incidence of asthma/allergy in the normal Swedish adult population. Minor laryngeal abnormalities found in 10 patients could be rejected as causative since they were inconsistent with the voice disturbance. In most of the patients (n = 27), vocal function returned to normal or improved after voice therapy combined with counselling. Vocal abnormalities remained unchanged in three patients. The patients who required multiple therapy sessions (n = 10) were older (mean age 48.8 years) and seemed to have more profound personal problems than the average. The findings suggest that psychogenic voice disorder may often be misdiagnosed as acute laryngitis or asthma/allergy. Restricted use of antibiotics and other drugs is to be recommended in the treatment of benign voice disorders.

Adult↗
PubMed1992

Acute laryngitis in adults: results of erythromycin treatment.

Previous studies of acute laryngitis in adults have shown high nasopharyngeal isolation rates of B. catarrhalis and H. influenzae. Phenoxymethylpenicillin had no effect on the clinical course. In the present study, 106 patients with acute laryngitis were treated with erythromycin 0.5 g x 2 V or placebo. During the first week the isolation rate of B. catarrhalis was reduced from 60 to 10% in the erythromycin group compared to 34 to 27% in the placebo group (p less than 0.01). The elimination of H. influenzae, isolated in 19% at the acute visit, did not differ between the two groups. As compared to controls, erythromycin treated patients reported significantly lower scores of subjective voice disturbance after 1 week and cough after 2 weeks. Laryngological examination and voice evaluation failed to reveal any differences between the groups.

Acute Disease↗
PubMed1992

Diagnosis of psychogenic dysphonia.

Background factors, symptoms and signs were analysed in 40 consecutive patients with psychogenic dysphonia. Their voice profile was compared with that of 40 patients with infectious laryngitis. The majority of the patients were young females, non-smokers, who were not professional voice users. Criteria for acute infectious laryngitis prior the voice disorder were met in no more than 10% of the patients. Nevertheless as many as 40% of the patients had been treated with various antibiotics. The prevalence of reported asthma/allergy-like symptoms was high, 37.5%. Perceptual analysis of voice profiles demonstrated similarity of aberrancies in psychogenic dysphonia and in acute laryngitis. Since it may be difficult to distinguish psychogenic dysphonia from acute laryngitis, careful analysis of anamnestic data may be helpful for a correct diagnosis.

Acute Disease↗
PubMed1992

Effect of intravenous diazepam and thiopental on voluntary saccades and pursuit eye movements.

The effects of diazepam and thiopental on voluntary saccades and pursuit eye movements were tested in 9 volunteers, with an interval of at least 2 weeks between tests. One, 4 and 8 h after intravenous injection of diazepam (0.3 mg/kg) or thiopental (6.0 mg/kg), voluntary saccades and pursuit eye movements were tested and blood samples taken for analysis of drug concentration. As compared to results of tests without drugs, a significant reduction both of saccadic peak velocity and gain of pursuit eye movements was found 1 h after injection of either drug, but not after 4 and 8 h. The amplitude of saccades elicited with the 60 degrees stimulus was significantly reduced 1 h after injection of diazepam. Latency of saccades increased significantly up to 4 h after injection of either drug. No significant correlation was found between peak velocity of saccades and blood concentration of either thiopental or diazepam 1 h after administration. The present results confirm that in man saccades and pursuit eye movements are reduced by benzodiazepines and barbiturates, but provide no support for the previously described efficacy of saccades in monitoring the effect of benzodiazepines. It is hypothesized that diazepam and thiopental also induce reduction of voluntary saccades and pursuit eye movements via a general sedation of the central nervous system (CNS), besides having specific effects on CNS structures important to the performance of voluntary eye movements.

Adult↗
PubMed1991

Effect of proprioceptor stimulation on postural stability in patients with peripheral or central vestibular lesion.

Body sway in upright stance at rest and after inducing proprioceptor stimulation, elicited by vibration applied to the calf or neck muscles, was studied in 11 patients with peripheral lesion and in 17 patients with central vestibular lesion. The responses were compared with those of 20 normal subjects. Vibratory stimulus was applied at five different frequencies, ranging from 32 to 150 Hz, and at a constant amplitude of 2.1 mm. Postural stability was measured with a force platform in terms of average deviation of body position (ADBP) analyzed in relation to the individual maximum support distance in the anterio-posterior direction. In patients with peripheral vestibular lesion ADBP was moderately increased, compared to normal subjects, when the calf muscles were exposed to vibration under eyes closed conditions (i.e. no visual information available); stimulation of neck muscles both under eyes open and eyes closed conditions and stimulation of calf muscles with open eyes produced an ADBP of the same magnitude as in controls. In patients with central vestibular lesion, proprioceptor stimulation of calf and neck muscles caused increased ADBP whether with eyes open or closed. The ADBP induced by stimulation of neck muscles was significantly greater in patients with a central lesion than in those with a peripheral vestibular lesion. The results indicate that patients with peripheral lesion differ from those with central vestibular lesion in their reaction to proprioceptor stimulus; and that in patients with central vestibular lesion proprioceptor stimulation of the neck muscles produces disproportionately powerful cervico-collic reflexes.

Brain Stem↗
PubMed1989

Effects of intravenous diazepam and thiopental on the vestibulo-ocular reflex in man.

The effects of i.v. injection of diazepam 0.3 mg/kg and thiopental 6.0 mg/kg on vestibulo-ocular reflex (VOR) were studied in 9 healthy volunteers. One hour after injection of both diazepam and thiopental VOR gain was reduced and time constant shortened. Four hours after intravenous injection of diazepam the VOR gain was still significantly reduced and had not yet returned to control 8 h after injection. Although both drugs were detected in blood still 8 h after the injection, there were no longer significant effects on VOR. Moreover, individual values of VOR gain and time constant did not correlate with the blood concentrations of the drugs. Decrease of VOR gain and shortening of time constant after i.v. given diazepam and thiopental in man are interpreted as resulting from both specific effects on VOR and non-specific reduction of alertness.

Adult↗
PubMed1989

Reduction of the time constant in the VOR as a protective mechanism in acute vestibular lesions.

Fourteen patients with vestibular neuritis were examined at onset of symptoms and after one year. Postrotatory time constant and gain in the vestibulo-ocular reflex (VOR) were measured after rotation with a velocity step of 150 deg/s. There was no significant difference in gain towards the healthy side at onset of the disease compared to recordings after one year. The time constant towards the healthy side was significantly shorter at onset compared to measurements after one year. The results reflect the loss of unilateral vestibular function on the velocity storage mechanism, both in the acute situation and after compensation. The findings indicate that reduction of the time constant in the VOR is not only due to unilaterally vestibular impairment but it is also an effect of the generally reduced activity in the vestibular system after a lesion and may act as protective mechanism in acute vertigo.

Acute Disease↗
PubMed1988

Clinical aspects of eye tracking test.

The eye tracking test is today a well established part of clinical otoneurological examination. In the present paper some applications of the test in evaluating of the level of lesion within the vestibular system are reviewed.

Central Nervous System Diseases↗
PubMed1988

Presentation of a posturographic test with loading of the proprioceptive system.

Postural control is maintained by sensory feedback from visual, vestibular and somatosensory receptors. Recently several methods for evaluating postural control have been devised, utilizing an imposed perturbation. Most of these methods use stimuli which simultaneously affect more than one of the sensory feedback loops. In the present paper a posturographic technique is presented with specific loading of the proprioceptive system, using a computer controlled vibratory stimulus and computerized analysis of the results.

Central Nervous System Diseases↗
PubMed1988

Pharmacological treatment of vertigo.

A review of the treatment of vestibular disorders with drugs is presented. In animal experiments, administration of certain drugs, e.g. alcohol, barbiturates and chlorpromazine, retards the vestibular compensation, while others, e.g. caffeine, amphetamine and ACTH, accelerate the compensation. In compensated animals, some drugs produce overcompensation and some decompensation. A double-blind, randomized trial of the effect of scopolamine and dimenhydrinate in patients with vertigo of varying origin showed, as compared with placebo, that these drugs did not significantly alleviate the vestibular imbalance. The reason for the poor efficacy of the treatment may have been overcompensation of vestibular function loss and adverse effects caused by the drugs. Care should be taken that the drugs used do not retard the vestibular compensation caused by the central nervous system.

Animals↗