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Biomedical subjects

N Mygind

Publications and source records attributed to N Mygind.

At least 91 records · Page 5Linked to original sources
PubMed1983

Inhibition of histamine-induced nasal symptoms by the H1 antihistamine chlorpheniramine maleate: demonstration of topical effect.

To study whether a histamine H1 receptor antagonist inhibits allergic rhinitis symptoms by a peripheral or a central mode of action 21 normal volunteers were challenged with 500 micrograms histamine chloride in the right nasal cavity on four occasions after bilateral pretreatment with an H1 antihistamine spray and a placebo spray in various combinations. The H1 antihistamine (chlorpheniramine maleate, 0.5 mg) significantly inhibited histamine-induced tickling (P less than 0.01), sneezing (P = 0.01) and discharge (P less than 0.01), but only when it was given on the same side as histamine. This is highly suggestive of a local effect on sensory nerve endings, which prompts further studies on the topical use of antihistamines in the nose.

Administration, Intranasal↗
PubMed1983

Ipratropium treatment for rhinorrhoea in patients with perennial rhinitis. An open follow-up study of efficacy and safety.

The efficacy and safety of intranasal ipratropium therapy for rhinorrhoea were tested in an open follow-up study of 20 adult patients with perennial rhinitis. The reduction of nasal hypersecretion of 40-45% obtained with 80 micrograms four times daily in a placebo-controlled study, was maintained over the next 4 weeks although the mean daily dose was reduced to 180 micrograms. The spray treatment was well tolerated and rhinoscopy, measurements of the sense of smell and the secretory responsiveness of the nose before and 10-48 months after the start of the trial did not reveal any signs of serious local adverse effects. It is concluded that ipratropium nasal spray is effective in the treatment of rhinorrhoea and appears to be safe for long-term use.

Administration, Intranasal↗
PubMed1983

A comparative study of dexchlorpheniramine maleate sustained release tablets and budesonide nasal spray in seasonal allergic rhinitis.

It was the aim of the study to compare the efficacy and side effects of oral antihistamine and nasal glucocorticoid therapy in seasonal allergic, rhinitis. In a double blind, double-dummy, group-comparative study, 61 adult grass pollen allergic patients were either treated with dexchlorpheniramine maleate sustained release tablets (6 mg b.d.), or with budesonide nasal spray (200 micrograms b.d.). After a 1-week run-in period, treatment was given for 3 weeks in the grass pollen season. Patients treated with budesonide showed significantly less nasal blockage than those who received dexchlorpheniramine (P less than 0.05), but there was no difference in the number of sneezes and nose blowings. Patients treated with budesonide and a larger quantity of antihistamine-vasoconstrictor eye drops (P less than 0.01). Drowsiness occurred in the group that was treated with dexchlorpheniramine, but mainly during the first week of treatment. The side effects caused by the budesonide spray were few and insignificant. The patients' overall assessment of the treatment favoured the glucocorticoid spray (P = 0.06).

Administration, Intranasal↗
PubMed1983

Intranasal verapamil in allergen-induced rhinitis.

Twenty-six pollen-allergic subjects participated in a double-blind, placebo-controlled trial of the protective effect of the calcium antagonist, verapamil, on allergen-provoked nasal symptoms. Intranasal verapamil, 1 mg. had a weak protective effect in that "tickling score" was 22% lower (P less than 0.01) and the number of sneezes 29% lower (nonsignificant) after verapamil as compared with placebo pretreatment. There were no differences with regard to nasal blockage or discharge. It is concluded that the verapamil spray used, cannot be recommended for clinical trials, but that further investigations of other formulations of calcium antagonist are justified in order to analyse the potential role of this type of drugs in the treatment of allergic rhinitis.

Administration, Intranasal↗
PubMed1983

Role of histamine and antihistamines in the nose.

The effect of an H1 antihistamine (chlorpheniramine) and an H2 antihistamine (ranitidine) nasal spray on histamine-provoked symptoms was studied in normal volunteers. Firstly it was shown that the H1 antihistamine has a marked inhibiting effect on tickling, sneezing and discharge, and secondly, that both H1 and H2 antihistamines have a weak effect on blockage. Finally, it was found that the H1 antihistamine, in the concentration used, has no demonstrable anti-cholinergic or local anaesthetic effect. It is concluded that antihistamines act locally in the nose, H1 antihistamines inhibit tickling, sneezing and hypersecretion via nervous H1 receptors, while blood vessels possess both H1 and H2 receptors.

Chlorpheniramine↗
PubMed1983

Blind quantitative electron microscopy of cilia from patients with primary ciliary dyskinesia and from normal subjects.

Cilia from the nasal cavity of 27 patients with congenital ciliary dyskinesia (immotile cilia syndrome) and of 15 normal persons were examined by transmission electron microscopy. The patients had on average a significantly higher number of cilia with absent or markedly reduced numbers of outer or inner dynein arms, of cilia with various types of abnormal configuration of the microtubules, except for compound cilia, and of cilia with an abnormally large variation of the beating axis. Compound cilia were equally frequent in patients and controls. The main structural defect in 9 patients was absent or abnormality low number of outer dynein arms in 4 in conjunction with an abnormally large axis variation and in 1 with a markedly reduced number of inner dynein arms also in 1 with supernumerous axonemal microtubules also. In 9 patients the main defects were abnormal configuration of the axonemal microtubules and a large axis variation. Seven of these had eccentrically located central pairs of microtubules and radial spoke defects, 5 in conjunction with abnormally low numbers of inner dynein arms. In one patient there were various types of abnormal configuration of the axonemal microtubules together with absent inner dynein arms, in another cilia with supernumerous microtubules only were present. The only abnormal finding in 1 patient was an extreme variation in the ciliary axes. Completely normal ciliary ultrastructure was found in 8 patients.

Adolescent↗
PubMed1983

Effect of a cholino-ceptor antagonist in the nose.

As parasympathetic reflexes are of importance for nasal hypersecretion, treatment of rhinorrhoea with a cholino-ceptor antagonist seems rational. We have therefore studied the topically active anti-cholinergic drug ipratropium in laboratory studies and clinical trials. This drug, as a nasal spray, could markedly inhibit metacholine-induced hypersecretion for a prolonged period, in a dosage having no demonstrable systemic effects, in treatment of patients with perennial rhinitis and watery rhinorrhoea as the major symptoms. The daily use of ipratropium spray caused a moderate reduction in the use of handkerchiefs. It is concluded that this new treatment can be of value in such patients, but it is important to realize that the effect is strictly monosymptomatic. Finally, how this type of therapy can be further improved is discussed.

Atropine↗
PubMed1983

Effects of oral norephedrine on common cold symptoms.

The aim of the trial was to examine the effectiveness of an oral decongestant in common cold. Thirty subjects with naturally acquired colds got a 100 mg sustained release tablet containing norephedrine on one day and a placebo tablet on another day in double blind design. Changes in nasal patency were assessed by rhinomanometry, measurement of nasal expiratory peak flow, and a self-assessment test, and the number of sneezes and of nose blowings were recorded in a 10 hours period after medication. Rhinomanometry, but not peak flow measurements showed a significant difference (p less than 0.02) two hours after medication, and the self-assessment of nasal blockage showed that the effect lasted for the entire 10 hours observation period (p less than 0.01). Nasal respiration was reestablished in half of the blocked noses. There was no effect on number of sneezes and nose blowings. In conclusion, oral norephedrine has a moderate decongestant effect, which may justify its use in adults with common colds. This symptom amelioration must be balanced against cost of therapy and risk of side effects. A prevention of otitis media and of sinusitis has not been documented in the literature.

Administration, Oral↗
PubMed1983

The anti-allergic effect of the beta 2-adrenergic agent fenoterol in the nose.

Beta-adrenergic agents have a direct relaxing effect on bronchial smooth muscle. In vitro investigations of a number of sensitized preparations have demonstrated an inhibition of the antigen-induced histamine release. Grass pollen allergic patients were pretreated in the laboratory, out of the season, with different dosages of intranasal fenoterol before an allergen challenge and hay-fever patients treated with fenoterol during the season in a clinical trial. The laboratory studies demonstrated a moderate and significant (p less than 0.01) inhibitory effect on the immediate allergen-induced symptoms, suggesting an action on mediator release from mast cells. Fenoterol had only a slight, although significant (p less than 0.05), effect on nasal symptoms in the clinical study. In conclusion, fenoterol seems to have an anti-allergic effect, when applied to the airway mucosa, but the effect on allergic rhinitis does not seem sufficient to justify the introduction of fenoterol as a nasal spray.

Airway Resistance↗
PubMed1983

Nasal reactivity in rhinitis.

The purpose of this review is to present data on nasal reactivity to methacholine, histamine and allergen in normal subjects, patients with common colds, perennial rhinitis and hay-fever. Nasal challenge is performed by spraying the agent into the nose and counting the sneezes, measuring the resulting secretion and the increase in nasal airway resistance during a 15 minute period. We found that there was a small increase in reactivity during a common cold, but a considerable increase during the hay-fever season and associated with perennial rhinitis. We conclude that a nasal challenge test may be a valuable tool as an objective parameter for the diagnosis and for the estimation of the severity of rhinitis. It may also be helpful in the evaluation of new drugs and give information regarding pathogenetic mechanisms as well as the mode of action of specific drugs.

Allergens↗
PubMed1983

Nasal mucociliary transport, number of ciliated cells, and beating pattern in naturally acquired common colds.

Repeated samples of nasal epithelium were taken for in vitro study of the number and motility of ciliated cells (microphoto-oscillographic technique), and nasal mucociliary clearance transport rate was measured (saccharin test) in 26 subjects with naturally acquired common colds. The transport rate was markedly reduced during the disease, and a slight impairment remained even after 32 days. There was a considerable fall in the number of ciliated cells, and regeneration was slow. A moderate and shortlasting change in beating frequency and intracellular synchrony was also observed. It is concluded, that a common cold, as a rule, results in marked and long-lasting impairment of nasal mucociliary clearance function, and this may be the cause of some otherwise unexplainable symptoms from the nose and throat.

Adult↗