gunshot

Michell

J.

peripheral

of

wounds

nerves..

F.R.C.P.,

Clarke, M.D.,

Lieut.-Col., R.A.M.C.(T), Professor of Medicine, University of Bristol.

Injuries

of

Projectiles

of

peripheral

nerves

high velocity

with

successful treatment is of the prevention of

permanent

It may be said make nerve

positive injuries

in wounds due

to

great frequency, and their highest importance in the

disabilities of the most serious kind..

at once that

statements and the

occur

are

we

as to

not

yet

in

a

position

to

what the ultimate results of

operations

undertaken for their relief

will be. The

spiral,

nerves

most

frequently

affected

are

the musculo-

median and ulnar in the arm, the sciatic, and

especially

branch, in the

external

popliteal

Injuries

to the brachial

leg. plexus are also common. A nerve may be (i) completely divided?when this is so there is rarely a clean cut through it, but more often destruction

or

obliteration of it for

to several inches ;

a

considerable distance, from

one

(2) partially divided, or (3) injured by by callus, by fragments of bone, compression by a lodged bullet, or portions of clothing, or by a traumatic aneurysm, by bruising or concussion. It is important to remember that perineural scars and adhesions, though conspicuous at operation, may not be responsible for blocking the passage of impulses, but that this may be due to concomitant intra-neural hemorrhage, fibrosis (neuroma), or molecular changes of concussion. Trotter and Davis have shown the intolerance of the ordinarily isolated or

in scar-tissue,

62

J. MICHELL CLARKE

LIEUT.-COL.

nerve-tissue to the contact of connective tissue, and that the active

of

out-growth

fibrils of

nerve

a

response to the contact of non-nervous forms

part

a

tough,

fibrous

their further extension ; nerve

capsule

nerve

tissue, which

around them, and

is

on

a

its

prevents

this may lead to irritation of the

and

hyper-sensitiveness. experiences of the knowledge as to the course

The extensive exact

divided

individual

nerve

The location of the on

the

give

nerves

more

of the

bundles to different muscles, information

which is much needed for

data, and

should

war

in the

more exact

to

injury

course

of the

plastic

a nerve

surgery.

rests on

anatomical

aided

by X-rays

projectile,

the presence of foreign bodies. In multiple wounds the diagnosis of the one causing the lesion is made from as to

The extent of

anatomical considerations. nerve

is estimated

damage

to the

of motor and sensory

by investigation wasting, pains

muscular

and hyperesthesia, paralysis, and electrical reactions, and all of these trophic lesions, symptoms which are present should be compared, and the

diagnosis based upon the full results. There is no short cut to diagnosis. Many consider that sensory changes give more important

information both

lesion than motor

paralysis

as

or

to extent and progress of the electrical reactions.

It has been claimed that in the

area

of loss

sensation, and

incomplete division of a nerve to protopathic is greater than to epicritic that the borders of the respective areas

approach and recede not yet established. It

is

certain

from

or

that the

cross

but this is

each other ;

distinction

between

complete

physiological blocking of it by involvement in scar tissue cannot always be made, for full sensory and motor loss with R.D. may be present in

anatomical division of

a nerve

and

the latter. Pains and

hyperesthesia

mean

partial injury

of

a

nerve ;

GUNSHOT WOUNDS OF PERIPHERAL

"when these gradually disappear and give place to and tactile anaesthesia

"tissue,

of the

compression probably taking place.

callus, etc., is

63

NERVES.

analgesia scar

by

nerve

Hysterical anaesthesia of the sleeve, glove or stocking type may be present as a complication of peripheral nerveinjuries, generally in partial ones. In gunshot wounds, however, especially of plexuses, the symptoms are often very and the sensory loss may not at first correspond the known anatomical distribution of the nerves,

complicated, with

and may resemble hysterical anaesthesia, but after a few weeks Partially clears up leaving a residual loss in recognised areas

nerve-supply. The

severe

forms of trophic disturbance, such

intractable ulcers, usually nerve,

the milder forms in

A lesion

complete 111

for

partial

complete

the sciatic, where

a

whole

a

?* as

or not at

Their any

most

wound of the

nerve

to

electrical power, is

limited

on

important

excitable fibres

high or

the

internal

and leave the other

in the

nerve at

electrical reactions

give

no

information

the seat of

peripheral

to the

reactions.

are

When all have

injury.

as to extent

Its

of

injury

now

This

fact, that voluntary give such

to nerve.

largely

great advantages

sufficient information, is

No. 133.

injury.

returns before the muscles

response does not go pari passu with the chief reason why electrical reactions

reliable, gives

as

function is to decide whether there

The Lewis Jones Condenser is

XXXV.

as

external

power usually Faradism or the condenser.

information

electrical

on

Electrical reactions

going

keen lost, voluntary respond

a

all affected.

nerves.

to what is

and

nerve

Much discussion has taken place

damaged

deep

lesions.

gluteal region may completely divide the Popliteal fibres, most often the former,

little

as

division of

may, however, be of its bundles of fibres ; this is not infrequent for

partial one

in

occur

used for are

painless,

taking

that it is and

saves

64

LIEUT.-COL.

time.

On the other

MICHELL CLARKE

J.

hand,

it has been

shown

that the

discharges vary with the resistance and other and that the patient's resistance is not constant, as

condenser

factors, practical

purposes it was at first assumed that it would be, and therefore caution is necessary in estimating the for

progress of a lesion by condenser reactions, for which it has been especially advocated. Further, the ready diffusion of the current renders its

advantages defects, and

although

gained from general use.

be for

(1)

secondary

greatly outweigh

think that

methods,

Operations

it

its

more

information is

seems

likely

on cases

in this

to come

country

will

Before

operation can be done,. soundly healed; (2) there must be a after the injury before exact diagnosis is suture.

the wound must be

sufficient interval

possible, partly nerve

of

some

the older

As to treatment.

The

difficult for small muscles.

of the condenser, however,

to be

into

use

because characteristic

take time to

develope,

wounds of

and

partly

signs

of division of

because in most

a

cases

the extent of

paralysis is at first more extensive than remains permanently. Especially in wounds of a plexus, the immediate loss of sensation and motion may affect the whole limb, and after a time partially clear up, leaving a residual paralysis. Whilst waiting, preliminary treatment must be carried out. This consists in wrapping the limb up warmly to protect it from cold and injury; in placing it on a suitable splint to keep the paralysed muscles relaxed?a point of the greatest importance ; daily gentle massage and movements, during which the paralysed muscles must be kept relaxed ; and electrical treatment by the passage of a constant current,, condenser discharge, rhythmically interrupted by a or metronome, and just strong enough to cause a contraction gunshot

nerves

of the muscle. It is desirable before

operation

to

give

a

prophylactic

65

GUNSHOT WOUNDS OF PERIPHERAL NERVES.

dose of

antitoxin,

tetanus

operation undertaken

Operation

some

is advisable

as

tetanus may

months after the

(and,

ceteris

develop after original injury.

paribus,

the earlier

performed the better the results) (i) in complete division of nerve ;

in

(2)

incomplete

lesions

a

where the condition is

(a)

paralysis after three to four months, (b) where improvement has begun but stopped abruptly, with signs of compression of the nerve by scartissue, callus, etc., (c) where there is great pain, not relieved

stationary

after

with

be

definite residue of

weeks'

some

always

a

careful treatment, the

explored (pieces

of bone,

should

nerve

foreign bodies,

or

shreds

?f

clothing may be found in the nerve) ; and (3) in cases of old standing with intractable trophic lesions, for even if no paralysis results, the trophic lesions quickly heal. In the majority of cases there is little difficulty in deciding whether operation is necessary or rjot. Even slight return ?f voluntary power negatives operation. In doubtful cases nothing is lost and often much gained by an exploratory ?peration, though occasionally the nerve may be found to be apparently normal in cases where the paralysis was complete. This is especially true of the musculo-spiral nerve. In plexus lesions where several trunks have been divided, often at different levels with much perineural scar-tissue, good

to the

accurate identification of trunks and end to end suture is most difficult, and if found to leave

things

Trotter

advises

every

impossible,

probably

early operation

nerve

in cauda

where there is the least

case

it is

alone than to do indiscriminate

better

crossing.

lesions in

equina suspicion of an

element

of pressure.

The post-operative treatment, and that of

division

of

nerves

is the

same as

given

cases

above in

of

partial

preliminary

treatment, and should be continued daily until there is a return ?f

voluntary impulses,

the lower

extremity

which may take weeks or years. In a walking instrument must also be

66

J. MICHELL CLARKE

LIEUT.-COL.

for

provided little

dropped

feet.

electrical treatment

nerve

time,

After end to end suture of should not be

and then with

begun

for

a

some

care.

great especially in the early stages, care must be fatigue of the muscles by electrical treatment;

In all cases, taken to avoid

the balance of evidence is that contractions due to electrical stimulation have

no

may be severe

beneficial in the

stage of'regeneration, but effect on muscular wasting. In later stages there irreparable paralysis and joint or bone lesions so are

as to

neutralise the effect of recovery of paralysed cases operations for tendon transplantation

muscles ; for such or

arthrodesis may be advisable. As to results. Cases of nerve concussion should

within four to six weeks ;

partial

division of

a nerve

recover

should

complete recovery in several months (? two to six). As to cases of complete division with secondary suture, it

go to

time to

speak as to the results. Meanwhile, some statements of recent experiences seem to show a much earlier return of sensation and motion than was before held possible. The greater the distance from the periphery the site of the lesion the longer is the period before recovery. is not

yet

Findings, by Short, M.S., F.R.C.S.

Operative Procedures

and

Capt. Rendle

2.

may appear to be normal (vide supra). division of the nerve, with a bulbous

mass

of the upper segment, succeeded by a of scar-tissue of variable thickness, and adherent to the

1.

The

nerve

Complete swelling at the end surrounding

tissues. The treatment

adopted is to free the segment through the swelling, so as to expose

two ends of the nerve, cut off the upper

upper end of or above the bulbous visible nerve-bundles with no excess of interstitial fibrous

tissue, and suture with catgut.

Many English

surgeons wrap

67

GUNSHOT WOUNDS OF PERIPHERAL NERVES.

the

junction in Cargile membrane ; others sometimes use a segment of saphena vein, but often nothing is used. It frequently happens that the ends cannot be brought

together

because of

bridged by

gap of

a

two or three

plies

one

to two inches.

This is

of internal cutaneous

from the upper arm, but some surgeons and others employ nerve-anastomosis.

use

nerve

catgut strands,

There may be a bulbous swelling on the nerve, to the track of the bullet, and it may be doubtful

3.

adherent

whether the nerve-fibres pass through it or are interrupted. In such a case we stimulate the nerve electrically above and below the bulb.

sized

(not

nerve

contract, the

saphena

If, in the

scar

of

a

small

sciatic), any muscles is freed and wrapped in

If there is

vein.

case

the

no

response,

we

or

medium-

supplied by it a segment of excise the

scar

and suture.

large nerve, such as the sciatic, may show symptoms partial division, and at operation part of the nerve shows a scar. The best procedure is to take out a quadrilateral, including the scar, and, by splitting the nerve-trunk up and down, to bring the two ends together, leaving the intact A

4.

?f

a

portion of the The

5.

bullet the

cause

time,

it is

undisturbed.

may be intact, but pressed upon by a shattered bone. The treatment is to remove

nerve

by

or

nerve

although this relieves pain at the during the process of healing, and

of pressure, but

apt

to return

prove very intractable.

REFERENCES.

Nerve Injuries and their Treatment, Purves Stewart & Evans, London, 1916. discussion on Gunshot Wounds of the Peripheral Nerves," Medical Society's Trans., 1916, xxxix. 27.

Core,

"

Dissociation of

Cutaneous Sensations in

Nerves," Lancet, 19x6, i. 716. Stopford, Peripheral Nerve Injuries," ibid., 1916, "

Injuries ii.

718.

to

Peripheral

68

LIEUT.-COL.

JAMES

SWAIN

"

Cause and Nature of Changes which occur in Muscles after Nerve Section," ibid., 1916, ii. p. 6.

Langley,

Langley, ibid., 1916, ii. p. 161. Hernaman Johnson, ibid., 1916, ii. p. 120. Hernaman Johnson, Condenser Reactions," Proc. Roy. Soc. Med., 1916, Surgical Section, p. 1. Warrington and Nelson, Musculo-Spiral Nerve Injuries," Liverpool Med. Chir. Journ., 1916, lxix. p. 61. Bernard Roth, Gunshot Wounds of Peripheral Nerves," Journ. R.A.M.C., 1915, i. p. 267. Treatment of Nerve Injuries of Warfare," Clin. Journ., 1916, Piatt, Aug. 9th., p. 285. Electrical Reaction of Muscles before and after Nerve Injury," Adrian, "

"

"

"

"

Brain, 1916, vol. xxxix., pt. i., p. 1. " Roberts, Degeneration of Muscle following Nerve Injury," Brain, 1916, vol. xxxix., pt. iii., p. 297.

" Electrical Testing," Proc. Roy. Soc. Med., 1914., Elect. Cumberbatch, Therap. Section, p. 38.

Purser, Roy. Acad. Med. Ireland, Section Surgery, 1916. Tubby, Nerve Concussion due to Bullet and Shell Wounds," Journ., 1915, i. p. 57. "

Brit. Med.

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