Part 13 (1/2)
We may have a dicrotic, or double, pulse; a thready pulse, which is extremely small and scarcely perceptible; the venous, or jugular, pulse; the ”running down” pulse, and so on. (See p. 76.)
In cattle the pulse is conveniently felt over the submaxillary artery where it winds around the lower jawbone, just at the lower edge of the flat muscle on the side of the cheek. If the cow is lying down the pulse may be taken from the metacarpal artery on the back part of the fore fetlock. The pulsations can be felt from any superficial artery, but in order to ascertain the peculiarities it is necessary to select an artery that may be pressed against a bone.
[Ill.u.s.tration: PLATE VIII. Position of the Lung.]
There is a marked difference in the normal or physiological pulse of the horse and that of the cow, that of the horse being full and rather tense, while in the cow it is soft and rolling. The pulse is faster in young or old cattle than it is in those of middle age.
_Auscultation._--Auscultation and percussion are the chief methods used to determine the various pathological changes that occur in the respiratory organs. Auscultation is the act of listening, and may be either mediate or immediate. Mediate auscultation is accomplished by aid of an instrument known as the stethoscope, one extremity of which is applied to the ear and the other to the chest of the animal. In immediate auscultation the ear is applied directly to the part. Immediate auscultation will answer in a large majority of cases. Auscultation is resorted to in cardiac and certain abdominal diseases, but it is mainly employed for determining the condition of the lungs and air pa.s.sages. Animals can not give the various phases of respiration, as can the patients of the human pract.i.tioner. The organs themselves are less accessible than in man, owing to the greater bulk of tissue surrounding them and the pectoral position of the fore extremities, all of which render it more difficult in determining pathological conditions. (See Pl. VIII.)
The air going in and out of the lungs makes a certain soft, rustling sound, known as the vesicular murmur, which can be heard distinctly in a healthy state of the animal, especially upon inspiration. Exercise accelerates the rate of respiration and intensifies this sound. The vesicular murmur is heard only where the lung contains air and its function is active. The vesicular murmur is weakened as inflammatory infiltration takes place and when the lungs are compressed by fluids in the thoracic cavity, and disappears when the lung becomes solidified in pneumonia or the chest cavity filled with fluid as in hydrothorax. The bronchial murmur is a harsh, blowing sound, heard in normal conditions by applying the ear over the lower part of the trachea, and may be heard to a limited extent in the anterior portions of the lungs after severe exercise. The bronchial murmur when heard over other portions of the lungs generally signifies that the lung tissue has become more or less solidified or that fluid has collected in the chest cavity.
Other sounds, known as mucous rales, are heard in the lungs in pneumonia after the solidified parts begin to break down at the end of the disease and in bronchitis where there is an excess of secretion, as well as in other conditions. Mucous rales are of a gargling or bubbling nature. They are caused by air rus.h.i.+ng through tubes containing secretions or pus. They are said to be large or small as they are distinct or indistinct, depending upon the quant.i.ty of fluid that is present and the size of the tubes in which the sound is produced. According to their character they are divided into dry and moist. The friction sound is produced by the rubbing together of roughened surfaces and is characteristic of pleurisy.
_Percussion._--Percussion is that mode of examination by which we elicit sounds by striking or tapping over the part. It may be direct or indirect.
If the middle finger of the left hand is placed firmly on the chest and smartly tapped or struck with the ends of the first three fingers of the right hand, the sound will be noticed to be more resonant and clear than when the same procedure is practiced on a solid part of the body. This is because the lungs are not solid, but are always, in health, well expanded with air. In certain pulmonary diseases, however, as in pneumonia, they fill up and become solid, when percussion produces a dull sound, like that on any other solid part of the animal. When fluid has collected in the lower part of the chest cavity the sound will also be dull on percussion.
Where there is an excess of air in the chest cavity, as in emphysema or in pneumothorax, the percussion sound becomes abnormally loud and clear. By practice on healthy animals the character and boundaries of the sounds can be so well determined that any variation from them will be readily detected, and will sometimes disclose the presence of a diseased condition when nothing else will.
Percussion is sometimes practiced with the aid of a special percussion hammer and an object known as a pleximeter to strike upon. A percussion hammer is made of rubber or has a rubber tip, so that when the pleximeter, which is placed against the side of the animal, is struck the impact will not be accompanied with a noise. A percussion hammer and pleximeter may be purchased from any veterinary instrument maker.
CATARRH (COLD IN THE HEAD).
Nasal catarrh is an inflammation of the mucous membranes of the nostrils and upper air pa.s.sages. Simple catarrh is not a serious disease in itself, but if neglected is liable to be complicated with laryngitis, bronchitis, pneumonia, plurisy, or other serious and sometimes fatal diseases of the respiratory organs. Catarrh is a common disease among cattle. It is often caused by sudden exposure to wet and cold after they have been accustomed to shelter. It may arise from inhalation of irritating gases. It is also sometimes produced by certain specific atmospheric conditions, and may a.s.sume an enzootic form. It is very debilitating, and requires prompt and judicious treatment.
_Symptoms._--Redness of the mucous membranes of the nose and redness and watering of the eyes are symptoms of nasal catarrh. The mucous membrane first becomes dry; afterwards a watery discharge appears, and later, in severe cases, the discharge becomes mucopurulent. In mild cases there is little or no fever, but in severe ones it may run high. The animal becomes dull, languid, and is not inclined to move about, and the appet.i.te may become impaired; there is also variable temperature of the horns and ears.
If in a cow giving milk the secretion diminishes, the mucus from the eyes and nose becomes thicker and yellower. Afterwards, as the symptoms increase in severity, the discharge becomes mucopurulent.
_Treatment._--The animal should be housed in a well-ventilated place, with good hygienic surroundings. In cold and damp weather it should be kept warm with blanketing, and, in severe cases, hot, medicated inhalations given. If the fever is high, it may be reduced by giving nitrate of pota.s.sium, from 1 to 2 ounces, in the drinking water, three times daily. Diffusible stimulants are beneficial in most cases. Too much importance can not be attached to good nursing. There is no necessity to resort to the old system of bleeding, purging, or the use of powerful sedatives.
EPISTAXIS (BLEEDING FROM THE NOSE).
Bleeding from the nostrils is rather rare in cattle. It may arise from any one of a variety of causes, but usually results from disease or injury to the mucous membranes or to violent exertions in coughing and sneezing. It is seldom serious. It generally occurs in drops from one nostril only, accompanied with sneezing, and without frothing. Bleeding from the lungs comes from both nostrils, is bright red, frothy, and accompanied with a cough.
_Treatment._--In many cases the bleeding will cease spontaneously and all that is necessary is to keep the animal quiet and bathe the head and nostrils with cold water. The cause of the bleeding should be learned and governed accordingly in the treatment. In severe and exceptional cases, when the hemorrhage is persistent and long continued, the animal's head should be tied to a high rack or beam and cold water or ice applied, or recourse to styptic injections taken. If the hemorrhage is profuse and persistent, either a drench composed of 1-1/2 drams of acetate of lead dissolved in a pint of water or 1-1/2 drams of gallic acid dissolved in a pint of water should be given.
LARYNGITIS (SORE THROAT).
An inflammation of the mucous membrane lining the larynx is known as laryngitis. It may be either a primary or a secondary disease, complicated or uncomplicated. In the majority of cases it is attributable to some form of exposure, a sudden change from warm to cold surroundings, or exposure to cold storms. It may also result from inhaling irritating gases or from external violence. In an acute attack of laryngitis there is an elevation of temperature, pain on pressure over the region of the larynx, violent paroxysms of coughing, difficult and noisy respiration. The nostrils are dilated, the nose extended, and the animal has a frightened expression.
There is marked difficulty in swallowing.
_Treatment._--Treatment consists of fomentations and hot applications over the throat. Stimulating liniments, mustard mixed with cold water and well rubbed in with a stiff brush, or other forms of counterirritation may be applied in severe cases. Hot inhalations should be frequently resorted to, and often afford much relief to the suffering animal. In this disease medicines should be given so far as possible in the form of electuaries (soft solid) on account of the difficulty of deglut.i.tion. Large drafts of medicines have a tendency to produce violent spells of coughing, and in this way r.e.t.a.r.d recovery. The subjoined formula for an electuary will be found to answer the purpose in ordinary cases: Chlorate of pota.s.sium, pulverized, 8 ounces; fluid extract of belladonna, 2 ounces; powdered opium, 1 ounce; powdered licorice root, 8 ounces; sirup, sufficient quant.i.ty; mix. Place a small tablespoonful of the mixture frequently on the tongue or back teeth. Or the following may be used instead: Aloes, powdered opium, and gum camphor in equal parts; mix. Rub an ounce on the molar teeth every four or five hours. The bowels should be kept open and the diet should be such as the patient can easily swallow. Warm, sloppy mashes, boiled oatmeal gruel, linseed tea, and the like are the most suitable substances. If suffocation be threatened during the course of the disease, tracheotomy should be performed without delay. The details of the operation are fully described under the head of ”Surgical operations.” (See p. 289.)
When the disease a.s.sumes a chronic form, strong counterirritation is indicated. A cantharides blister may be applied, or the following ointment used: Biniodid of mercury 1 part, lard 6 parts; mix. In some cases it will be found necessary to repeat the application.
BRONCHITIS.