Muscular Rheumatism

SYNONYMS.—Myalgia rheumatica or myopathia; Fr. Rheumatisme musculaire; Ger. Muskelrheumatismus.

DEFINITION.—The affections included under this term are certain painful disorders of fibro-muscular structures. They are commonly found in persons the subjects of the rheumatic diathesis, and are characterized by pain and often spasm, and sometimes a slight degree of fever. No doubt as our knowledge increases so many attacks connected with painful states of muscles and fasciæ are eliminated from the somewhat uncertain group of muscular rheumatism. True inflammation is not believed to exist, and pathological investigation has rarely shown any morbid changes in the affected parts. The symptoms, therefore, have been attributed to some temporary hyperæmia, slight serous exudation, or neuralgic state of the sensory nerve-filaments. The strongest support is given to this statement from the absence of any marked tenderness in such affected muscles as can be sufficiently examined. In certain cases, undistinguishable clinically, it is quite probable that a periarthritis is in reality the principal factor in the case. In others, again, a subacute rheumatism affecting a joint seems to spread to the adjoining tendinous sheaths, and thus secondarily to attack the muscles themselves, the affection of which may ultimately remain the only condition present.

ETIOLOGY.—Muscular rheumatism is a very common affection. All ages are liable to its occurrence, but the part affected varies with the time of life, children and young adults being much more subject to torticollis, and older persons to lumbago and general rheumatism of the limbs. Amongst hospital patients the disease prevails more amongst men than women, owing doubtless to the greater exposure of the former to the cold; but amongst other classes the same difference is not seen. It is observed in all countries, but according to some writers it is unusually frequent in tropical climates, although there acute rheumatism is very uncommon. The causes of muscular rheumatism are mainly exposure to cold and strain or fatigue of muscles. If these two conditions coexist—e.g. standing in a draught of cold air or lying on the ground when fatigued—the chances of the affection coming are greatly enhanced. Strain, a twist of the body, or a false step can actively start an attack of this kind, and by the sufferers themselves it is constantly attributed to this cause. The part played by this element is difficult to determine, a very slight strain being often followed by great pain and distress from the subsequent rheumatic affection. Some individuals are specially prone to attacks, the slightest current of air, change of clothing, etc. being sufficient to determine its occurrence. These persons are often found to have suffered from rheumatism in some other form, and thus in them we must consider that the rheumatic diathesis furnishes the reason for their unusual susceptibility. It only remains to mention the fact that a disposition to gout seems to favor the development of muscular rheumatism. In gouty families, therefore, it has been observed to be common.

SYMPTOMS.—In all cases pain is the prominent, and in many cases the only, symptom present. In all except the more aggravated attacks pain is felt only when the affected part is disturbed. In such when complete rest or fixed immobility is maintained there is comfort, or at most a somewhat dull, uneasy sensation, but when any contraction of the muscles in question is produced, whether voluntary or otherwise, severe often excruciating pain is at once experienced, often giving rise to a sudden cry or causing the features to be contracted in a grimace. The suffering ceases almost at once when the muscular contraction is relaxed. In more aggravated attacks the pain is more severe, and besides persists, though to a less degree, even when there is no contraction. In rare cases when the maximum degree has been attained there is continuous pain, but the affected muscles are persistently maintained in a relaxed condition by means of true spasm in the surrounding muscles. Slow passive movement affects the subject of muscular rheumatism, and may often be accomplished with a little management without causing pain. If, at the same time, these muscles be handled by pinching and slight pressure, it will be found that they are very sensitive to the touch. When some tenderness does exist, it is slight and is not located in the district of the lower nerve-trunks. Pressure even sometimes allays pain. The constant effort to avoid pain gives rise to a feeling and appearance of stiffness, and thus characteristic attitudes and positions of the head, trunk, or limbs are voluntarily and persistently maintained. There is no spasm of the affected muscles; the distortion is the result of stiff contraction of the associated muscles, which thus forcibly fix the faulty one and hold it in a state of relaxation. Cramp or spasmodic contraction of a single muscle of a painful character does, however, sometimes occur in rheumatic subjects, and much resembles the condition above described. In the same persons also muscular rheumatism may occur in a much more fugitive or erratic form, frequently being nothing more than a slightly painful condition of some group of muscles which have in some way been exposed to cold. This may last but a short time, and either spontaneously disappear or be readily removed by exercise or friction. Muscular rheumatism is generally confined to one muscle or a single group of muscles. Those most liable to it are the very superficial and those easily exposed to cold (e.g. the deltoid and trapezius), powerful muscles often subjected to violent strain (e.g. the lumbar muscles), and those aiding in the formation of the parietes of the great cavities.

This affection very commonly exists without any constitutional disturbances, but sometimes there are present the symptoms of pyrexia—slight elevation of temperature and temporary disorder of the digestive organs—loss of appetite, constipation, and general malaise.

The acute forms generally last but a few days, terminating by gradual subsidence and final disappearance of the pain. The fugitive kind, already alluded to, may, however, be present more or less during several weeks.

DIAGNOSIS.—Errors of diagnosis between muscular rheumatism and a variety of other disorders are common. Laymen especially are only too apt to attribute pain felt in muscles at once to rheumatism of these muscles—a term which is badly abused. Some of these errors are of no great interest, but others are of the highest importance, for they may cause the onset of a serious disease to be overlooked. The principal affections to be borne in mind with reference to diagnosis are the following: organic diseases of the spinal cord (notably tabes dorsalis), causing peripheral pains as an early symptom; functional disorder of the same part, as hysteria or spinal irritation; intra-thoracic inflammation; the onset of an exanthem; the pains produced by the chronic poisoning of lead and mercury; neuralgia; painful spasm of muscle from deep-seated inflammation or suppuration. It is sufficient to indicate these various sources of fallacy, which, if remembered, can generally be guarded against by a consideration of the special features characteristic of each one.

TREATMENT.—The indications for the treatment are mainly two—viz. to relieve the pain and to counteract the diathetic condition generally present. The relief of the pain is accomplished in various ways, according to the seat of the trouble. In severe cases it is proper to resort to the hypodermic use of morphia, to which may be advantageously added some atropia. When the pain is seated in large muscles, the injection will produce better results if thrown not merely under the skin, but into the substance of the muscle. Sometimes perfect rest in bed is necessary to secure the required immobility; in other cases this can better be secured by plaster or firm bandages. Soothing anodynes are extremely useful locally, and counter-irritants also may be used with benefit. Liniments give us a convenient form of application. The best are those containing a considerable proportion of chloroform with either aconite or belladonna, or both. The repeated application of tincture of iodine often gives great relief. Galvanism sometimes proves a rapid cure. Continuous heat is nearly always grateful, and may be applied either in the dry form or by means of soft warm linseed poultices with or without a percentage of mustard. When these are discontinued, care should be taken to protect the affected muscles from cold by keeping them enveloped in flannel or woollen coverings.

Whilst these local measures are being adopted the constitutional disorder should also receive attention. A diaphoretic action should be set up. For this purpose the hot-air or Turkish bath at the outset would seem to be sometimes really abortive. Of medicinal means amongst the most reliable are liquor ammonii acetatis and Dover's powder. Pilocarpine occasionally proves useful. The fixed alkaline salts are also sometimes beneficial, such as the acetate and citrate of potassium and, at a later stage, the iodide of potassium. In a certain number of cases of muscular rheumatism the sodium salicylate acts promptly and well. This drug will succeed well in proportion as the evidence of the rheumatic constitution is well marked, as shown by the tendency on other occasions to attacks of acute articular rheumatism.

Persons who are subject to muscular rheumatism should be made to wear warm clothing, avoid draughts, guard against strains and twists, and in other respects to be careful of their general hygiene. Obstinately recurring cases will very often receive benefit from a visit to some of the natural springs known to possess antirheumatic qualities.

The chief varieties of muscular rheumatism, divided according to the locality affected, require some separate description.

1. Lumbago, or myalgia lumbalis, is that common form which attacks the lumbar muscles and the strong aponeurotic structures in connection with these. It is more frequently than any other form attributed to some effort of lifting or sudden twist of the trunk, but in many cases it owes its origin directly to exposure to cold. The pain comes on suddenly and renders the person helpless, the body, if he is able to go about, being held stiffly to prevent any movement or bending; if severe, he is absolutely compelled to observe complete rest in bed. The muscles, when handled, appear slightly sore, but no local point of acute tenderness can be found. This fact, with the characteristic shrinking from any movement, distinguishes lumbago from neuralgia and from abscess. Pain in the loins, more or less severe, is such a frequent accompaniment of disorder of several organs and parts that careful examination should always be instituted lest some serious organic disease with lumbar pain as a symptom be mistaken for a simple lumbago. The most important of these are perinephritis, lumbar abscess, spinal disease, abdominal abscess, and disease of the rectum and uterus.

2. Pleurodynia, myalgia pectoralis or intercostalis. Here the affected muscles are the intercostals, and in some cases the pectorals as well. Spasmodic pain is felt in one or other side of the chest, and is especially aggravated by the movements of respiration; it is rendered intense by the efforts of coughing or sneezing. Pleurodynia may be confounded with pleurisy, the distinguishing features being the absence of fever and the friction sound of pleurisy. Intercostal neuralgia is sometimes with difficulty known from pleurodynia, but in the former the pain is more circumscribed, more paroxysmal, and more easily aggravated by pressure than in pleurodynia, and when severe there are tender points in the course of the nerve a little outside of the middle line posteriorly (dorsal point) and anteriorly (sternal point). Now and then the hyperæsthetic areas become anæsthetic, and even patches of herpes may form in the course of the nerve, when doubt can no longer remain. From periostitis of a rib pleurodynia may be known by the fact that in the one the tenderness is marked in the intercostal space, and in the other in the rib itself. Pleurodynia is a frequent accompaniment of thoracic affections, causing cough, the frequent paroxysms of coughing tending to induce a painful state of the overworked muscles. The pain, which may be very great, can often be controlled by fixing the chest with imbricated plaster or a firm bandage. Dry cups sometimes answer very well; if more active measures are necessary, then hypodermic injections of morphia must be resorted to.

3. Torticollis, myalgia cervicalis, stiff neck or wry neck, caput obstipum. This term includes those cases of rheumatic idiopathic affection of one or more of the muscles of the side and nape of the neck, which fixes the head firmly in the median line or else in a twisted fashion, with the face turned toward the sound side. The disease can be recognized at a glance by the peculiar manner in which a person will turn his whole body round instead of rotating his head alone. It is much more common in children than in adults. The sterno-mastoid is the muscle chiefly affected, but any of the muscles of the neck may become rheumatic in the same way, and frequently several of them suffer at the same time. The most important point at the outset of an attack of wry neck is to determine whether we have to do with a true rheumatic (idiopathic) disorder, or whether the muscular stiffness is secondary to some spinal or vertebral lesion. The diagnosis is usually founded upon the suddenness of the onset, the absence of other symptoms of nerve disease, and the rapid course of the case, terminating in a cure in a few days. There is nothing special in the treatment of torticollis beyond what has been already said under the general heading.

Other forms of muscular rheumatism which have received special names and have been separately described are the following: myalgia scapularis or omalgia, when the surroundings of the shoulder are affected; myalgia cephalica or cephalodynia, an affection of the occipito-frontalis; and abdominal rheumatism, when the external muscles of the abdomen are involved.