Practical pathology

by Aldred Scott Warthin

Fig. 25—Brass Measuring-Stick

When all is ready for the operation members of the family or of the laity should be tactfully gotten out of the room. It is always well to ask members of the family if they desire to be present, but this invitation should be given in the expectation that it will not be accepted. The effect of an autopsy upon the minds of the laity is not always a pleasant one, and harm is sometimes done through the misinterpretation of necessary procedures and the resulting gossip. In private practice it is worth while, as a matter of courtesy, to invite several of one’s colleagues to witness or take part in the autopsy. An ideal way would be to have one of these perform the operation in expectation of future reciprocation. In the interests of objective observation a clinician should never perform the autopsies of his own cases, but should turn them over to a trained pathologist or to a colleague. The operator is usually in a better position to know what to do than the onlookers, and while the suggestions of the latter are usually futile they may be endured for the occasional great help derived from them.

As far as the obducent himself is concerned he may prepare himself simply by removing his coat and rolling up his sleeves, or he may wear an autopsy coat or apron. While an autopsy can without doubt be best performed with hands bared, the danger to the operator is sufficiently great to lead him to sacrifice the undoubtedly greater technical skill thus gained, to his own safety, by the use of some protective. Rubber gloves of a medium weight, reaching half way to the elbows, are a great protection when carefully cleaned, sterilized and cared for. The sleeves of the coat may overlap the gloves and be fastened to these by an elastic band. When gloves are not used the hands may be covered with carbolized vaseline, or a six per cent solution of guttapercha in benzin. Cuts, abrasions, hang-nails, etc., must be protected by surgeon’s-plaster, collodion, finger-cots, etc. When these are used it may be necessary to remove them during the course of the autopsy, as they are easily torn or become loose. Frequent washing in flowing water lessens the danger of infection. Blood and other fluids from the body should never be allowed to dry upon the skin or upon anything used in connection with the autopsy.

Gloves should be thoroughly washed and scrubbed; and, when clean, washed in four per cent formaldehyde and dried before they are removed from the hands. They should be then dusted inside and out with talcum powder and put away dry. When they are again used they should be tested for holes by filling them with water. After having been used several times they easily tear. If the autopsy has been performed with unprotected hands, thorough disinfection of these, particularly of the finger-nails, should be carried out. Unpleasant odors may be removed from the hands by the use of mustard, dilute tincture of benzoin, turpentine, etc., and then washing with tincture of green soap. Rubbing with cornmeal is very effective in removing discolorations of the skin, particularly the blood-stains fixed by formaldehyde that occur so often in the course of autopsies on bodies injected by the undertaker.

Postmortem infections should receive prompt surgical attention, as the smallest one is dangerous and may develop in a few hours to such an extent as to cause the most alarming constitutional symptoms. In a way all autopsy work, like surgical operations, offers a risk to the operator. This is particularly great in all cases of pyogenic infection, tuberculosis, blastomycosis, syphilis and the acute specific infectious diseases. Any of these infections may be received through the unbroken skin by way of a hair-follicle; but previous cuts, abrasions, hang-nails, etc., form a frequent avenue of entrance for the infecting agent, as well as punctures, scratches and cuts received during the autopsy from instruments, spicules of bone, needles, etc. It is particularly dangerous to allow blood, pus or exudates from the peritoneal or thoracic cavity to enter a glove through a hole. A finger or hand so bathed is very likely to develop hair-follicle infections. All wounds received during the autopsy should be allowed to bleed freely, and then should be thoroughly washed in sterile water, alcohol and ether and an antiseptic.

Tuberculous warts are very common on the hands of prosectors having a large autopsy service and not using gloves. A generalized tuberculosis may follow. These warts are easily removed by repeated painting with fuming nitric acid, just sufficient to keep the skin yellow. If this treatment fails such warts should be excised. Syphilis has been reported only a few times as due to postmortem infection; but observations tend to show that the spirochætes may remain virulent for several hours (7-24) after death.

7. AUTOPSY TECHNIQUE. The object of the autopsy is to examine thoroughly, in as short a time as possible, and in the easiest and most convenient method, all of the organs and tissues of the body, with reference to the occurrence of disease-changes, in such a way that nothing will be overlooked or obscured. The preservation of relationships becomes, therefore, a very important matter; and nothing should be done to disturb these until a complete pathologic picture has been obtained. All unnecessary handling and cutting must be avoided. No hasty or ill-advised cuts should be made. Careful deliberation is often necessary as to the proper course to be pursued in order to obtain the proper result. Each autopsy is a law unto itself in this regard. New complications constantly arise and must be studied before the right way of revealing the solution of the pathologic problem is found. Above all things nothing should be destroyed until its relationships have been fully determined. False steps taken in an autopsy cannot be retraced, and the complete investigation and the successful attainment of a diagnosis may be made impossible by improper methods of technique. As in all other technical matters there is a best way of carrying out the different steps of the autopsy; and as this best way must be altered to suit the conditions as they arise, it follows that there is both a science and art of autopsy-making. Some general rules can be laid down that apply consistently to all autopsies, but strict adherence to one method is impossible in all cases. As in everything else the prosector should be master of his technique and not let it master him.

When everything is ready for the autopsy the operator should take his place at the right side of the cadaver, unless he happens to be left-handed, when it may be more convenient for him to stand at the cadaver’s left. This position at the cadaver’s side he does not leave, except when opening the cranium, when he stands behind the head. When the spinal cord is removed posteriorly he still remains on the same side of the table, although the cadaver, having been turned over, presents its left side toward him. The instruments arranged in proper order should be on a tray close at his right hand, either on a neighboring table or placed on the autopsy table. As they are used they should be washed and returned to their proper place and not allowed to lie on the body or table.

The cutting technique employed in the autopsy is, as a rule, quite different from that employed in surgical operations or in dissection. For the large incisions the cartilage-knife is used. It should be held in the palm of the hand so that when the arm is extended the knife-blade becomes an extension of the axis of the arm, and used with a free arm-movement, fingers and hand being firmly fixed to the knife-handle. Long, sweeping cuts, adequate in pressure, and giving smooth and even incisions, are made by moving chiefly from the shoulder, with secondary movement from the elbow. The knife-blade should not be pressed or pushed into the tissues, but should be drawn through them rather quickly, cutting as it is drawn. The greater the force used, the more swift the drawing-motion should be. All cuts should be clean; if made in the wrong place they will do less damage than ragged, uneven incisions. The toe of the cartilage knife is used for the beginning and end of long incisions and for cutting in hollow or depressed surfaces. For flat surfaces the belly of the knife is employed. The heel of the blade can be used for cutting cartilages. The incisions made in the body should be directed away from the operator, especial care being taken to avoid injuring his left hand or the hands or arms of anyone assisting in the operation. When the knife is held as directed there is not much danger of a slip except at the end of the incision when, the resistance being overcome, the knife goes through with a rush. To avoid this, pressure should always be slackened toward the end of the incision. The main incisions in the organs should be made with the brain-knife or short amputation knife, by a long, sweeping cut made from heel to toe of the knife-blade and beginning at the part of the organ farthest from the operator, drawing the blade through the organ toward the operator. For finer dissections the smaller scalpels are to be employed, and in such cases the dissection-technique of fixed arm and free finger movement must be used. In many places within the body the cutting-edge of the knife should be directed outward rather than inward so that underlying structures may not be injured. Often the fingers of the left hand are used in such cases to take the place of a grooved director. The application of these and other points of technique will be elucidated in the chapters following, whenever it is of advantage to use some especial method. In general nothing should be done to disturb relationships until these have been noted, and cuts should be made into organs in such a way that they may be reconstructed in their original shape and condition.