254. The motions of the brain covered by the dura mater are but little observable under ordinary circumstances when a circular portion of bone has been removed by the trephine; the surface of the dura mater remains in general perfectly LEVEL; it is of a reddish-silvery color, and is firmly attached to the cut edge of the bone. The surface is raised, however, on a full expiration, and it falls on a deep inspiration. Fluid secreted or placed upon it is seen to move synchronously with the pulse; but the dura mater never rises up into the hole made by the removal of the bone, unless some fluid be retained beneath it. If the quantity of fluid extravasated or collected under it be large, it rises immediately on the removal of the bone; but the protrusion of this membrane does not always take place for some hours afterward if the fluid be more diffused. The motions of the brain, when the dura mater is thus protruded into the opening, become very indistinct, even if they can be perceived. These two points, viz., the protrusion into the opening and the absence of pulsation, are important facts, little noticed by surgical writers, to be borne in mind in connection with the practice to be pursued.
If we sometimes see the natural and ordinary size of the brain diminished under pressure, and that certain symptoms, such as insensibility, syncope, convulsions, and paralysis, are consequent on this state, and are relieved by the removal of the pressure and the restoration of the compressed brain to its ordinary state, we may safely conclude that some derangement takes place in its integral parts, which may be best understood by the word compression. If we further consider that compression can rarely exist without irritation, and that sometimes of a formidable nature, there does not appear to be so much difficulty in the subject as is frequently represented, although the physiological explanation may not be so simple. In the present state of our knowledge, we apprehend that in many cases approaching to apoplexy, in which the symptoms are similar to those arising from compression, all, or nearly all, the vessels, as far as we can ascertain, are actually full of blood, instead of being partially empty and containing less than the natural quantity. When we see a patient, lying in a state of insensibility with a fracture of the cranium, immediately recover his senses after the application of the trephine and the removal of a large coagulum of blood, we are apt to suppose that the coagulum of blood and the insensibility stand in the relation to each other of cause and effect. It is not unreasonable to conclude that the pressure of the extravasated blood confined by the bone had occasioned the insensibility, and that this did not depend alone upon some few vessels containing less blood than usual; for the brain must be considered as a whole in all these investigations, and reference should not be made to its vascular structures only in explanation of the cause of its derangements.
255. When compression of the brain is caused by an extravasation of blood, the patient is insensible, breathes slowly, loudly, and in a heavy, labored manner, or with stertor, and cannot be awakened, although the noisy breathing may be for a time suspended. The breath is sometimes emitted from the corner of the mouth, like a whiff or puff of smoke, and with something of a similar noise: this, when permanent, is a more dangerous symptom than the common snoring or stertorous breathing. He sometimes froths at the mouth, and occasionally appears convulsed, but neither hears nor sees, nor takes the least notice of those about him. The countenance is generally flushed if the shock or blow has been slight, pale or livid if it should have been great. The pulse is usually slower than natural, sometimes irregular or intermitting, occasionally quick, even from the receipt of the injury. The pupils of the eyes may be contracted or dilated, being dependent for their condition more perhaps on the part of the brain affected than on the degree of injury. They are generally more contracted in the first instance than dilated; they may afterward pass into a medium or doubtful state; one may be even dilated, and the other not. In general, as the mischief is continued and augmented, they become dilated and immovable. The eyes may be turned upward, or may be fixed in the center, or be drawn irregularly outward or inward, causing strabismus, which is, however, a more rare occurrence. If the eyelids should be partially open, tickling the cilia or the conjunctiva of the ball with a straw or a feather will cause them to close, if the spinal cord be sound. The mouth and lips are more or less compressed, and fluids run out at the corners, unless placed on the very back of the tongue by a long, narrow spoon, when they are swallowed with difficulty. Paralysis of one side of the face and hemiplegia are common; paraplegia is more rare. In both kinds of palsy one part in one limb may be more completely affected than another, in which convulsive twitchings are sometimes present, as well as a frequent drawing up of the limb of the unaffected side. Tickling the soles of the feet or the palms of the hands will sometimes cause retraction of the toes or fingers when the limbs are apparently motionless; pricking them gently with a pin will often give rise to convulsive startings and tremblings of all the muscles of the extremity when tickling fails, showing that the capability to move the part remains, although the will to do so is wanting. The leg or arm is sometimes drawn toward the body when separated from it; it more often falls from the hand as if it belonged to the body of a dead person; the muscles are occasionally more stiff and rigid, and some power of motion remains, although but little of sensation; sometimes sensation is perfect when motion is lost, and sensation may be lost on one side and motion on the other. The urine at first retained may ultimately pass involuntarily, as well as the feces; nevertheless, irritating the verge of the anus will excite motion and contraction in the sphincter ani, if the functions of the spinal cord be not destroyed. The action of the involuntary muscles is little impaired in general, and the secretions are but slightly affected; when it is otherwise, the injury must have extended to the ganglionic system, and the whole of the nervous centers must be materially implicated.
The loss of motion, or of the power of moving parts of the body, is either perfect or imperfect according to the degree of injury which has been inflicted, varying from a sense of feebleness to an almost utter incapability of moving the part. It is accompanied in general by defective sensation, or numbness, or by the complete loss of sensation and of the power of resisting heat and cold; the whole side, or one extremity, or a part only of an extremity may be affected, and not the whole. The mischief which gives rise to the loss of motion usually occurs on the side of the brain opposite to that part of the body which is paralytic. This was known and stated by Hippocrates, and the subject has been pursued to the most complete demonstration by modern anatomists.
The pathological proofs are not less complete. Desault and Bichat were by no means satisfied that the paralysis which followed an injury always took place on the opposite side; and some pathologists since their time, while admitting the fact, have shown that there may be exceptions. It is acknowledged, although it is not clearly and satisfactorily accounted for as to the face, that an extravasation of blood into one hemisphere of the cerebrum, or even of the cerebellum, can cause paralysis of the complete half of the body on the opposite side. It has been demonstrated that the right side of the body and the left side of the face may be paralytic at the same time and from the same injury apparently of the left side of the head, the mischief which caused the paralysis of the right side being found, in by far the greater number of instances, on the left side of the brain, and that which gave rise to the paralysis of the left side of the face to have been caused by an injury in the course of the portio dura of the seventh pair of nerves when about to leave, or after it had left, the brain.
Burdach found, in 268 cases of lesion of one side of the brain, that 10 presented paralysis on both sides of the body, and 250 of one side; in 15 of these the paralysis was on the same side as the injury. Convulsions took place in 25 cases on the same side as the disease; in 3, on the opposite side. In cases of lesion of one corpus striatum, there were, in 36 instances, paralysis of the opposite side, and 6 with convulsions of the same side, and in no instance convulsions of the opposite side. In 28 cases of cerebral lesion of one side, the muscles of the opposite side of the face were paralyzed; in 10, those of the same side. Paralysis of the eyelid was in 6 cases on the same side, in 5 on the opposite side. Paralysis of the muscles of the eyeball occurred in 8 cases on the same side, in 4 on the opposite; paralysis of the iris, in 5 cases on the same side and in 5 on the opposite, the tongue being generally drawn toward the paralyzed side of the face.
A man fell down stairs and received an injury on the head from the fall which rendered him nearly insensible at the moment. There were no signs or appearances on the outside of the head indicative of any serious mischief, nor were any found on examination after death. The pulse was quick, and rose to 140; the left side was paralytic; the breathing not stertorous, but accompanied by a little puff on the right side of the mouth; the pupils somewhat dilated; he could not speak, convulsions supervened, and he died the day afterward. On dissection, the peculiar flatness of the convolutions of the brain on the right side was so remarkable, when compared with that of the left, as to leave little doubt of its having been occasioned by something which had pressed them forcibly upward against the inside of the cranium; and, on slicing off a portion of the brain, a larger coagulum of blood was found below than is usually observed to exist without the almost immediate death of the patient. The same thing has been so distinctly marked in other instances that no doubt can be entertained of those convolutions of the brain which were situated between the coagulum and the cranium having undergone a considerable degree of compression. It is worthy of remark that the pulse of this person was always regular and remarkably quick from the first examination after the receipt of the injury until the period of his death, showing, perhaps, that the action of the heart is not affected directly by pressure acting only on the upper surface of the brain.
256. Convulsive actions of the muscles, or positive convulsive fits, are always important symptoms; yet they seem in some persons to be dependent on idiosyncrasy, particularly when they appear early, and after the loss of blood, in which case they are less dangerous. They occur at different periods after the receipt of the injury, and have been supposed to depend in general upon laceration of the substance of the brain, although experiments on animals would seem to show that they may be caused directly by irritation of the cerebro-spinal axis within the skull, in which case the patients are more likely to recover. They have been observed particularly on the side opposite to that which is paralytic, so as to give rise to the idea that the paralysis is dependent on injury of one side of the cerebrum, and convulsions on injury of the other. When the effect of the mischief is so great as to cause complete paralysis, convulsive twitches do not take place, although they frequently precede, and may in many cases be considered as premonitory signs, while the evil which gives rise to the paralysis is gradually accumulating. When the paralysis is not complete, the side so affected suffers sometimes from slight convulsive twitches, while well-marked spasms prevail in the other, leading to the belief that, while paralysis is an affection of only half the brain of the opposite side, or of half the spinal marrow of the same side, convulsions are the effect of a more general irritation, capable, however, of being confined to a part; for partial convulsive motions do very frequently occur without any paralysis accompanying them on the opposite side. Several cases have occurred in which the convulsions have ceased, and the patients recovered after the removal of a portion of bone which was irritating the brain; but convulsions have generally been the forerunners of death when the seat of injury was unknown and effective relief could not be given. When they occur in cases apparently of pure concussion, accompanied by inflammation of the brain or of its membranes, and the patient recovers after many days of the strictest antiphlogistic treatment, it is possible that the brain may have been lacerated, and the cure have been effected by adhesion. Convulsions, it must be remarked, are among the most common symptoms of inflammation of the membranes of the brain, without any such lesion of its substance, although they are frequently wanting. They may be expected to take place about and after the fifth day in injuries of the head, when inflammation of the brain or of its membranes is about to extend to or to become continuous with the neighboring parts, and may be more or less severe, varying from a state of partial trembling of a limb to that of general agitation and restlessness of the body generally—from a slight, irregular movement of the eyelids, or of the muscles of the face, to the more marked spasmodic startings of the whole of one side, grinding of the teeth, and contraction of the limbs. It is far different with those convulsive movements which, at a late period, become nearly permanent, or with rigid spasms, resembling tetanus, in which the body is drawn in different directions, forward, backward, or to one side. These are for the most part forerunners of death. Examination after death, in such cases, has frequently shown nothing discoverable beyond inflammation of the pia mater, and an effusion of fluid, generally purulent, on the surface of the brain, or in its ventricles, or between the pia mater and the tunica arachnoides.
The three following cases are intended to show the different forms of paralysis that ensue after injuries accompanied by compression or irritation of the brain:—
Charles Murray, private in the 2d battalion of 1st Foot Guards, aged thirty-three, was wounded on the 18th of June, at Waterloo, by a piece of shell which struck him on the superior part of the left parietal bone. He remained insensible about half an hour, and on recovering from that state, was affected with nausea and some bleeding from the left ear, and found himself unable to move his right arm and right leg, which hung as if they were dead, and had lost their feeling. Admitted into the Minimes General Hospital at Antwerp on the 29th; he suffered much from pain in the head, which was relieved by his being twice bled. The paralytic affection having remained without change from the moment he was wounded, a piece of the parietal bone, about three-fourths of an inch long, and several smaller fragments, were extracted four days after admission into the hospital, two perforations with the trephine having been necessary. Immediately after the removal of the bone he recovered the use of his right arm and leg, so far as to be able to move them, and to be sensible of their being touched. He gradually recovered by the 14th of August, so as to be sent to the General Hospital at Yarmouth, never having had a bad symptom, the only defect remaining on the right side being an inability to grasp anything in his hand with force. The pulsation of the brain was still visible at the bottom of the wound for about the space of half the circumference of the crown of the trephine. September 16th, 1815: the wound has filled up with healthy granulations, and has nearly cicatrized. A small sinus remains at the superior part, through which the edge of the bone can be felt. His health has been invariably good, although he has suffered a good deal of pain twice previously to the coming away of little pieces of bone, and toward evening he has been generally subject to slight vertigo. Discharged cured.