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CARBON  MONOXIDE                                                   733

is a just perceptible effect, perhaps a slight headache and lassitude ; when it
equals 9, severe headache and nausea result; when it equals 15, the condition
is dangerous, and when it rises above 15, the conditions are such as will be
quickly fatal.

Chronic Poisoning.—This form of poisoning is found in persons, who are
constantly exposed to the action of the gas in gas houses and automobile
workshops, and in those inhabiting ill-ventilated rooms, in which fire is
burning. This is a result of frequent tissue injury due to intermittent con-
tact with the gas.

Symptoms.—These are headache, nausea, digestive disturbances, dyspnoea,
dizziness, mental torpidity, loss of,memory, wasting of the muscles, anaemia,
and in some cases symptoms of peripheral neuritis and glycosuria.

Treatment.—Remove the patient at once into fresh air. Commence
artificial respiration and supplement it by the administration of oxygen at
high tension. Donald and Paton 7 are of the opinion that mixtures of oxygen
and carbon dioxide should not be administered in the resuscitation of sub-
jects requiring and receiving artificial respiration, as there is a grave risk o£
high and dangerous tensions of carbon dioxide being induced in the subject.
Inject hypodermically 0.5 to 1 cc. of adrenaline and intravenously 5 cc. of 25>
per cent coramine solution, and repeat them, if'necessary, at intervals of from
half an hour to an hour. Keep the patient warm by applying hot-water-
bottles to the extremities and by covering the body with blankets.

In severe collapse administer subcutaneously normal saline or resort to
blood transfusion. A dose of 0.5 g. of procaine hydrochloride in 500 ml. of
5 per cent dextrose may be administered intravenously once a day in acute
and chronic poisoning and may be continued for five days.

After breathing is established, watch the patient carefully for the after-
effects of carbon monoxide poisoning, and give him hot tea or coffee when he
is conscious enough to swallow.

Post-mortem Appearances.—Externally, the lips and finger-nails have
a bright red colour. Irregular patches of a bright red colour are scattered
over the anterior surface of the body, and post-mortem stains appearing on
the dependent parts have also the same bright red colour. Internally, the
blood is fluid and of a bright cherry-red colour due to the formation of
carboxyhaemoglobin. The internal organs are hypersemic and are bright
red owing to the colour of the blood. The mucous membrane of the air-
passages is bright red, and is often covered with froth. The lungs are con-
gested, and may occasionally be oedematous. There may be haemorrhagic
and laecrotic lesions in the heart muscle. There is serous effusion into the
ventricles of the brain. Punctiform haemorrhages and softening in the cor-
tex and the lenticular nuclei may be found in chronic carbon monoxide

Tests.—1. Spectroscopic Test.—The spectrum of the blood will show
two absorption bands similar to those of oxyhsemoglobin, but placed nearer
the violet end. The addition of ammonium sulphide does not alter the

2.    Hoppe-Seyler's Test.—Caustic soda of specific gravity 1.3 produces
a greenish colour, if added to normal blood, but retains the bright red colour,
if carbon monoxide is present in the blood.

3.    Kurikel's Test.—The  suspected  blood,  diluted  with 4  volumes  of
water, is mixed with 3 times its volume of 1 per cent tannic acid solution
and shaken well.   Carbon monoxide blood forms a crimson-red coaguhim,

7.   Brit. Med. Jour., Feb. 5, 1955, p. 315.