Articles from Aids To Forensic Medicine And Toxicology
Action Of Poisons; Classification Of Poisons
Sale Of Poisons; Scheduled Poisons
Evidence Of Poisoning
Definition Of A Poison
Tobacco And Lobelia
Signs Of Death
Symptoms And Post-mortem Appearances Of Different Classes Of Poisons
Modes Of Sudden Death
There are three modes in which death may occur: (1) Syncope; (2)
asphyxia; (3) coma.
1. =Syncope= is death beginning at the heart--in other words, failure of
circulation. It may arise from--(1) Anæmia, or deficiency of blood due
to hæmorrhage, such as occurs in injuries, or from bleeding from the
lungs, stomach, uterus, or other internal organs. (2) Asthenia, or
failure of the heart's action, met with in starvation, in exhausting
diseases, such as phthisis, cancer, pernicious anæmia, and Bright's
disease, and in some cases of poisoning--for example, aconite.
The symptoms of syncope are faintness, giddiness, pallor, slow, weak,
and irregular pulse, sighing respiration, insensibility, dilated pupils,
Post mortem the heart is found empty and contracted. When, however,
there is sudden stoppage of the heart, the right and left cavities
contain blood in the normal quantities, and blood is found in the venæ
cavæ and in the arterial trunks. There is no engorgement of either lungs
2. =Asphyxia=, or death beginning at the lungs, may be due to
obstruction of the air-passages from foreign bodies in the larynx,
drowning, suffocation, strangling, and hanging; from injury to the
cervical cord; effusion into the pleuræ, with consequent pressure on the
lungs; embolism of the pulmonary artery; and from spasmodic contraction
of the thoracic and abdominal muscles in strychnine-poisoning.
The symptoms of this condition are fighting for breath, giddiness,
relaxation of the sphincters, and convulsions.
Post mortem, cadaveric lividity is well marked, especially in nose,
lips, ears, etc.; the right cavities of the heart and the venæ cavæ are
found gorged with dark fluid blood. The pulmonary veins, the left
cavities of the heart, and the aorta, are either empty or contain but
little blood. The lungs are dark and engorged with blood, and the lining
of the air-tubes is bright red in colour. Much bloody froth escapes on
cutting into the lungs. Numerous small hæmorrhages (Tardieu's spots) are
found on the surface and in the substance of the internal organs, as
well as in the skin of the neck and face.
3. =Coma=, or death beginning at the brain, may arise from concussion;
compression; cerebral pressure from hæmorrhage and other forms of
apoplexy; blocking of a cerebral artery from embolism; dietetic and
uræmic conditions; and from opium and other narcotic poisons.
The symptoms of this condition are stupor, loss of consciousness, and
The post-mortem signs are congestion of the substance of the brain and
its membranes, with accumulation of the blood in the cavities of the
heart, more on the right side than on the left.
It must be remembered that, owing to the interdependence of all the
vital functions, there is no line of demarcation between the various
modes of death. In all cases of sudden death think of angina pectoris
and the rupture of an aneurism.
The following is a list of some of the commoner causes of sudden death:
(a) =Instantaneously Sudden Death=--
1. Syncope (by far the commonest cause).
2. Aortic incompetence.
3. Rupture of heart.
4. Rupture of a valve.
5. Rupture of aortic aneurism.
6. Embolism of coronary artery.
7. Angina pectoris.
(b) =Less Sudden but Unexpected Death=--
1. Cerebral hæmorrhage or embolism.
2. Mitral and tricuspid valvular lesions if the patient exerts himself.
3. Rupture of a gastric or duodenal ulcer; rupture of liver, spleen, or
extra-uterine gestation, or abdominal aneurism.
4. Suffocation during an epileptic fit; vomited matter or other material
drawn into the trachea or air-passages; croup.
5. Arterio-sclerosis may lead to thrombosis, embolism, or aneurism.
6. Poisoning, as by hydrocyanic acid, cyanide of potassium, inhalation
of carbonic acid or coal gas, oedema of glottis following inhalation of
7. Rapid onset of some acute specific disease, such as pneumonia or
diphtheria; collapse from cholera.
8. Heat-stroke, lightning, shocks of electricity of high tension.
9. Mental or physical shock.
10. Exertion while the stomach is overloaded.
11. Diabetic coma; uræmia.
12. Status lymphaticus. This is a general hyperplastic condition of
the lymphatic structures in the body, and is seen in enlargement of
tonsils, thymus, spleen, as well as of Peyer's patches and mesenteric
glands. It is a frequent cause of death during chloroform anæsthesia for
slight operations in young people.
In addition, it may be as well to remember that death sometimes occurs
suddenly in exophthalmic goitre, hypertrophy of the thymus, and in
In some cases of sudden death nothing has been found post mortem, even
when the autopsy has been made by skilled observers, and the brain and
cord have been submitted to microscopical examination.
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