Respiratory diseases

Published on 23/06/2015 by admin

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Last modified 23/06/2015

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Chapter 34 Respiratory diseases

The respiratory passages from the nose to the terminal bronchioles in the lungs are moistened by a layer of mucus over the epithelial lining. This is secreted by special cells called goblet cells, and partly by small submucosal glands. The passages are also lined with cilia, which beat continually in the direction of the pharynx, enabling trapped particles to be swallowed or coughed to the exterior (cigarette smoke reduces this capability).

Sinuses

As discussed in Chapter 15 ‘Methods of administration’ (p. 120), the thin, highly vascular lining of the sinuses makes it easy to reach with soluble orthodox medication (in the form of sprays) and vapourized aromatic oils. This, combined with their fat solubility, ensures rapid absorption into the body and also the brain.

Because of this feature, it is usually one of the first areas in a patient to be affected by allergens.

Allergies

An allergic reaction is the body’s response to an antigen (see Chapter 30 ‘Inflammation and the immune system’, p. 225). This reaction can range from allergic rhinitis, hay fever and urticaria to drug hypersensitivities. The respiratory system plays a significant role in allowing allergens to enter the body.

The initial allergic reaction occurs in the following way:

A second exposure to the antigen activates a much greater response from the immune system, as the mast cells break open releasing histamines that react on mucosal membranes, smooth muscle, skin or other organs. The mast cells are concentrated at sites that are likely to incur most injury, e.g. mouth, nose, feet, blood vessels, skin, lungs and gut mucosa. This can create a problem if the mast cell activity gets out of hand and tissues from a variety of areas – from skin and joints to internal organs – are affected.