Lead poisoning and lead absorption : $b The symptoms, pathology and prevention, with special reference to their industrial origin, and an account of the principal processes involving riskLegge, Thomas Morison, Sir
Science
Lead poisoning and lead absorption : $b The symptoms, pathology and prevention, with special reference to their industrial origin, and an account of the principal processes involving risk
Legge, Thomas Morison, Sir
Lead poisoning
Between July, 1905, and 1908, sixty-two cases of plumbism in children
were admitted to the children’s hospital, and of these sixty-two cases
thirteen had well-marked ocular symptoms. The paralysis of the muscles
of the eye was almost invariably one of the external rectus, but other
muscles were at the same time affected; occasionally paralysis of the
whole of the oculo-motor muscles was seen with the exception of the
superior oblique. It is worthy of note that amongst these children a
very large number suffered, in addition to their eye paralysis, with
foot-drop and wrist-drop, and, on the whole, suffered from foot-drop to
a much larger extent than from paralysis of the hands.
Galezowski[15] describes paralysis of accommodation of the eye, and in
cases described by Folker[16] some amount of orbital paralysis was also
present.
7. _Generalized Paralysis._--These types do not differ in form from the
previously described types, except, perhaps, as regards their rapidity
of onset. Where the onset is slow (chronic) the subject is usually one
who has been previously affected with paralysis of the extensors of the
hand, followed by development of the paralysis in the shoulders, hand,
leg, thorax. In the acute form, paralysis may affect all the muscles
in a given limb or group, and reduce them in a few days to a complete
condition of paralysis. In extreme cases the patient lies on the back
and is incapable of rising, and sometimes even unable to eat. The
intercostals, diaphragm, and larynx, are also affected, while there is
generally dyspnœa and aphonia. The muscles of the head and neck appear
to escape. In these acute cases, pyrexia may be a common symptom.
=Electrical Reactions.=--The diagnosis of the affected muscle is
greatly assisted by careful examination of all the muscles in the
affected physiological group by means of the galvanic and faradic
currents. The battery for the purpose of testing the electrical
reactions must have an available electromotive force of over 40 volts.
A battery of thirty-two Leclanché dry cells is ample. For the faradic
current, a small induction coil operated by two Leclanché cells is
sufficient. One large, flat electrode should be used, and several
smaller ones.
The faradic current should be used first, as it stimulates the nerves
directly, and the muscles only indirectly, through their nerve-supply.
Each nerve trunk should be examined systematically. The motor points
correspond for the most part with the points of entry of the motor
nerves into the muscles which they supply. A small electrode, either a
button or a small disc about the size of a sixpence, should be used for
the examining electrode, while the larger electrode should be placed
either on the abdomen or between the shoulders. The electrodes should
be well soaked in normal saline.
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