cough


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Related to cough: bronchitis, whooping cough, dry cough

cough,

sudden, forceful expiration of air from the lungs caused by an involuntary contraction of the muscles controlling the process of breathing. The cough is a response to some irritating condition such as inflammation or the presence of mucus (sputum) in the respiratory tract, as in infectious disease, or to heavy dust or industrial or tobacco smoke. Coughing may also be a reflex action to factors outside the respiratory tract; diseases that are not respiratory in nature (e.g., congestive heart failure or mitral valve disease) often bring on coughing. If there is mucus or a foreign substance in the respiratory tract, the cough should not be hindered since by this action the offending matter is expelled from the body. If, however, the cough becomes exhausting, sedation is indicated.

Cough

 

a reflex act usually occurring as a result of the irritation of the mucous membrane in the respiratory tract during an inflammatory process caused by pathological products (for example, sputum) or foreign bodies. A cough is one of the principal indications of disease in the respiratory organs (larynx, trachea, bronchi, and lungs). The cough center in the brain can sometimes be stimulated without irritation of the respiratory tracts. This is the so-called nervous cough that occurs in cases of fear and embarrassment. A distinction is made between a dry cough (without the formation and secretion of sputum) and a wet cough (with sputum).

The cough stimulus begins by deep inhalation, followed by a tensing of the bronchial and all the respiratory muscles resulting in forced expulsion. In so doing, the rima glottidis is closed, and intrathoracic pressure rises sharply. With the opening of the rima glottidis, the air bursts forth from the respiratory tract, carrying with it the sputum that has accumulated in the bronchi and pulmonary alveoli, dust particles, and so forth. Thus, a cough can be beneficial in helping to cleanse the respiratory tract. However, a protracted and severe cough that occurs with infections of the pleura, liver, and some other organs is harmful to the organism, since a systematic elevation of the intrathoracic and intrabronchial pressure leads to the gradual formation of pulmonary emphysema and impedes the flow of blood through the veins to the heart. This can lead to cardiopulmonary insufficiency.

Treatment is directed at the affliction that has caused thecough. With a wet cough, particularly if it is difficult to bring upthe sputum, expectorants are used; with a dry, persistent cough, cough suppressants are administered.

cough

[kȯf]
(medicine)
A sudden, violent expulsion of air after deep inspiration and closure of the glottis.
References in classic literature ?
"I am sure I am much obliged to you for your good opinion," returns the stationer with his cough of modesty, "but--"
Snagsby blows his nose and coughs his cough of sympathy, a step is heard without.
Seated at the same table, though with his chair modestly and uncomfortably drawn a little way from it, sits a bald, mild, shining man who coughs respectfully behind his hand when the lawyer bids him fill his glass.
Now the woman coughs, and lies still in the snow until the fit has passed, when she crawls on again.
." she coughed violently, "oh, cursed life," she cried, clearing her throat and pressing her hands to her breast, "when I .
He watched Eva feverishly day by day, as might be told by the frequency with which he repeated over that "the child was quite well"--that there wasn't anything in that cough,--it was only some little stomach affection, such as children often had.
I am a poor soul, I am indeed, and troubled with a grievous cough.'
You have just taken in a lodger I have been speaking to; an infirm woman with a cough.'
At this second interchange of the Christian name, Madame Defarge, still using her toothpick with profound composure, coughed another grain of cough, and raised her eyebrows by the breadth of another line.
The symptoms of Natasha's illness were that she ate little, slept little, coughed, and was always low-spirited.
The friend put his hand up to his mouth and coughed again.
Bumble coughed--louder this time than he had coughed yet.