Nasal Tests At Bronchial Asthma

Solutions injection of probable allergens into a nose gives good diagnostic results when determining the substance causing attacks of allergic (atopic) bronchial asthma. Nasal tests with bacterial allergens don’t give a progress, perhaps, because of low concentration of provocative antigens in vaccines.

Results of nasal tests well coincide with indicators of skin tests. If the nasal test is negative but this substance nevertheless causes suspicions it is possible to use inhalation test.

Tenfold dilution of allergen in dissolvent (normal saline solution) for nasal test is prepared. One half of nose is considered as control, the second – experimental.

4 drops of control liquid (pure physical solution) is instilled into experimental half. The patient is observed for 10 minutes. If the patient feels well and nature of respiration through nose didn’t change and there are no changes at a rhinoscopy test with allergen is carried out.

With 30-minute intervals of experimental part of nose 4drops of each allergen dilution is instilled on. Initial concentration is selected individually. In 10-30 minutes after introduction of every nature of nasal respiration is estimated and nasal cavity is examined. Signs of positive reaction are: an itch and burning sensation, difficult nasal respiration in the experimental half of nose, sneezing, watery discharges. At rhinoscopy reddening of mucosa becomes perceptible, edema, narrowing of passages, secretion intensifying.

Test is stopped after identification of the first positive signs. Wash out with warm physical solution the experimental half of the nose, instill in it vasoconstrictive medicines, give to the patient inside an antihistamine preparation. Only one provocative test can be carried out per one day.

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