A few words must be said in regard to the pathological conditions which may be directly produced by lightning and can be detected during life. The burns, wounds, ecchymoses, dendritic marks, and other external signs have already been fully considered.
Certain pathological changes, however, have been found in the eyes which are capable of being verified during life. In addition to swelling and œdema of the lids, to the injuries from burns and to the various paralyses of the ocular muscles, changes in the tissues of the eye itself may occur. In the first place we may find corneal opacities and adhesive iritis. Iridocyclitis may occur. Cataract formation is not rare, and its causation has given rise to many theories. Optic neuritis and neuro-retinitis are sometimes found; and we have sometimes optic atrophy. Structural changes in the choroid may also be caused by lightning. Rupture of the choroid, hemorrhage from the choroid and retina, and partial detachment of the retina may occur from the shock without the patient being struck by the lightning and without rupture of the external tissues.
Ears.—Perforation of the tympanum is reported in more than one case.
Autopsies.
We shall consider here the pathological conditions found in deaths from electricity, whether due to artificial or to atmospheric sources. The results are or may be the same in either, so far as we now know, and it is probable that the action of the electricity is practically the same in either case, only varying as regards the strength and tension of the current.
Rigor Mortis.—This has generally been found in cases of death from artificial electricity. In the case of Jugigo, who was executed by electricity, it was present four and one-half hours after death. As regards its occurrence in death by lightning and the rapidity of its onset, there has been much discussion. It is certainly present in many cases, and the probability is there is nothing diagnostic in regard to it in deaths by lightning. When absent, its absence is probably due to the presence of some external factor and has no relation to the form of death. We have, on the other hand, no proof that the rapidity of its onset is increased.
Coagulation of the Blood.—It has been observed frequently that the blood of persons struck by lightning does not coagulate readily. Sullivan states that in certain cases of complete disorganization after lightning shock the blood is left fluid and incoagulable and its color changed to a deep black. In one of the cases of death from artificial electricity reported by Grange, the heart was found sixty-two hours after death to be filled with liquid blood of a rosy vermilion color, which quickly became darker on contact with the air. A spectroscopic examination of the blood showed the normal lines of oxidized blood reducible by sulphydrate of ammonium. In a case reported by Matzinger the blood as submitted was black and perfectly fluid, the corpuscles, both red and white, were normal, and no fibrin was detected. In those executed by electricity the blood seems to have been fluid and not in any way remarkable.
There seems to be no evidence that the bodies of those dying from electricity in any form suffer unusually rapid decomposition.
The only absolute sign of death from electricity is decomposition of the tissues, but the usual signs are to be relied upon to the same extent as in ordinary cases of death.
Internal Organs.—In the cases of death from mechanical electricity no changes in the internal organs other than those due to accidental traumata have been found, except a considerable degree of congestion and sometimes minute hemorrhages in the heart substance beneath the pericardium and into the pulmonary air-vesicles and pleura. In one of Grange’s cases the heart was filled with liquid blood; in the other it was completely empty, the right ventricle collapsed, the walls of the left ventricle hard and contracted.