Download - Neck ( Non Spinal ) Injuries
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Introduc
tion
This
chapter
aims to
discuss
the
manage
ment of
soft
tissue
neck
injuries.
It is
specifically
directed
away
from the
manage
ment of
the
cervical
spine
and
spinal
injury in
trauma
patients.
We
mainly
refer to
penetrati
ng neck
injuries,
however
the
assessm
ent and
manage
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ment of
any neck
soft
tissue
injury
should
follow a
common
pathway
in our
opinion.
Specific
consider
ation of
skininvolvem
ent in
these
injuries is
also left
to other
texts.
Soft
tissue
injuries
in the
neck are
difficult
to
assess
and
manage.
This
compact,
important
anatomic
al area
contains
a dense
concentr
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ation of
vital
vascular,
aero-
digestive
and
nervous
system
structure
s; many
of which
are not
accessibl
e to
physicalexaminat
ion and
surgical
exposure
is a
challeng
e. There
has been
a shift
away
from
early
aggressi
ve
operative
manage
ment to a
more
selective
and
conserva
tive
approach
,
however
controver
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sy still
exists.
(Demetri
ades et
al. 1996)
A
thorough
review of
current
literature
has been
made to
give the
bestavailable
evidence
base; the
referenc
es are
included
at the
end of
the
chapter.
General Points about soft tissue injuries of the neck
Difficult to assess
Difficult to manage
Surgical exposure is a challenge
Controversy regarding mandatory exploration or selective
conservatism
History
First documented treatment of vascular injury in the neck Ambrose
Pare 1510-1590
1803, Fleming ligated lacerated common carotid artery
2nd world war, 851 cases of neck injury were reported with a 7%
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mortality, in Vietnam this rose to 15% (Thal 1988)
1944, Bailey proposed early exploration of all cervical haematomas
on the basis of wartime experience (Bailey 1944)
1956, Fogelman and Stewart (Fogelmann & Stewart 1956) reported
a series of 100 patients showing a mortality of 6% in patients
undergoing early neck exploration versus 35% for those whose
exploration is delayed. They advocated mandatory, early exploration
of any wound penetrating the platysma.
Subsequently the rate of negative neck explorations increased and
the operative mortality fell leading to a selective approach to
management challenging this older dictum (Asensio et al. 1991)
Neck anatomy
The anatomy of the neck is unique as it contains many vital structures
representing the most important body systems. Traditionally an anatomical
scheme to look at the neck uses triangles, each triangle containing different
vital structures and coated by muscle, fascia and skin. Classically the neck is
divided into anterior and posterior triangles by the sternocleidomastoid
muscle.
The anatomical structures in the neck structures are invested by two fascial
layers:
1. The superficial fascia lies just beneath the skin and encompassesthe body of platysma (a thin superficial muscle that originates over
the upper part of the thorax and passes over the clavicles across the
neck and blends with the superficial musculo-aponeurotic system
(SMAS) of the face).
2. The deep cervical fascia can be subdivided into investing, pre-
tracheal and pre-vertebral layers.
The investing fascia encompasses the sternocleidomastoid,
omohyoid and trapezius muscles as it encircles the neck.
The pre-tracheal fascia attaches to the thyroid and cricoid cartilages
and blends with the pericardium in the thorax. It encloses the major
neck viscera (thyroid gland, trachea & oesophagus)
The pre-vertebral fascia encompasses the pre-vertebral muscles
and blends with the axillary sheath, which houses the subclavian
vessels.
The carotid sheath is formed by all 3 components of the deep fascia.
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Anatomy
Neck contains structures representing different systems:
Cardiovascular
Respiratory
Digestive
Endocrine
Central nervous system
Such tight fascial compartmentalisation of the neck structures limits external
bleeding from vascular structures (Fig. 1). This beneficial effect is countered
by the dangers of bleeding within these closed spaces, which can
compromise the airway.
Figure 1: Cross sectional view of cervical fascial planes (from Gray SW,
Skandalis JE, McClusky DA: Atlas of Surgical Anatomy. Baltimore, Williams &
Wilkins, 1985, p15, with permission).
Penetrating neck injury is most commonly referred to in terms of zone of
injury (Fig. 2), rather than triangles. This is because this allows knowledge of
the possible structures involved, the need for additional specialised
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investigations, surgery and prognosis.
Figure 2: Anatomic zones of the neck (from Feliciano, Moore & Mattox:
Trauma 3rd edition. Appleton & Lange 1996, p330, with permission).
Anatomic zones of injury
Zone Boundaries Structures at risk
I
Clavicles inferiorly to
the inferior aspect of the
Cricoid cartilage
Proximal Common
Carotid, Vertebral and
Subclavian Arteries
Major vessels of the
Superior Mediastinum,
Apices of the lungs
Oesophagus, Trachea and
Thoracic Duct
II
Cricoid cartilage
inferiorly up to the
angle of the mandible
Carotid and Vertebral
Arteries and Internal
Jugular Vein
Larynx, Trachea &
Oesophagus
Vagus nerve, Recurrent
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(Note - Some authors use the inferior border of the mandible as the upper
boundary of zone 2) (Demetriades et al. 1997)
Mechanisms of injury
Classification of neck injury can be accomplished in different ways. The
anatomical site of injury and the related structures are vital, however the
history, mechanism and pattern of injury also give us important information
and clinicians should get as much history as possible from the pre-hospital
carers / ambulance personnel.
Epidemiology
The typical victim sustaining a penetrating neck wound is male in his
late 20s (Miller & Duplechain 1991)Male: Female =5:1 (Markey, Jr.,
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Hines, & Nance 1975)
Although one might expect that the number of firearm injuries to
have increased over the last 30 years, both firearm and stab wounds
have increased at a comparable rate (Markey, Jr., Hines, & Nance
1975;Noyes, McSwain, Jr., & Markowitz 1986;Saletta et al. 1976)
The most common site of injury is the anterior triangle of the neck
Initial management
An ABC approach to all trauma patients has now become standard thanks
to the teaching of Advanced Trauma Life Support (ATLS). As part of this
teaching, the assessment and immediate management of life threatening
problems go hand in hand in a stepwise progression. The presence of a
bleeding neck wound shouldnt detract from an airway injury, respiratory
distress, stridor and altered level of consciousness mandating emergency
airway management. (Walls, Wolfe, & Rosen 1993) The importance of this
process cannot be emphasised too much; approximately 10% of patients with
penetrating neck injuries present with airway compromise. (Pate 1989) 25-
40% have a vascular injury (10% carotid artery), 10% have a respiratory tract
injury.
Expeditious pre-hospital transfer without intervention in the urban
environment, gives the patient with life threatening soft tissue neck injury the
best chance of survival. Airway and respiratory care are paramount and early
endotracheal intubation should be considered if patients present with
symptoms of respiratory obstruction:
Restlessness
Stridor
Air hunger
Hoarseness
Tracheal tug
Retraction of supraclavicular, intercostals or epigastric areas
Cyanosis
Inability to swallow and drooling
Prophylactic intubation is preferred in as controlled a fashion as possible
rather than emergency intubation, cricothyroidotomy or tracheostomy.
Patients should be assessed and initially treated in a Trendelenburg position
in order to minimise the chances of air embolism.
Direct pressure is used to control external haemorrhage. Vascular access
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should be attained, ideally on the contra-lateral side to the injury and blood is
taken for cross-match of 6 units of packed red blood cells. If bleeding cannot
be controlled by direct pressure, balloon-tamponade may be attempted
(Gilroy et al. 1992), however blind / non-selective clamping of vessels should
be avoided to prevent further injury to structures.
The insertion of a nasogastric tube at this early stage should be avoided to
keep patient agitation to a minimum and to prevent bleeding which had
previously been controlled.
Demetriades (Demetriades, Asensio, Velmahos, & Thal 1996) suggests an
algorhythmn for evaluation of penetrating neck injuries (Figure 3)
Figure 3: Algorithm for neck injury evaluation (with permission)
There are other schemes based on findings in zones of the neck, (Klyachkin
et al. 1997;Velmahos et al. 1994). The basic aim is to have a fast and
effective method of assessment, so that injuries are not missed and overtreatment avoided.
A chart to aid the examination and recording of this type of injury has been
proposed by Demetriades et al (Figure 4). Some authors feel that
examination alone is sufficient in the assessment of Zone 2 neck injuries
whilst others feel that it is reliable in all Zones (Demetriades et al.
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1995;Demetriades, Theodorou, Cornwell, Berne, Asensio, Belzberg,
Velmahos, Weaver, & Yellin 1997;Jarvik et al. 1995;Kendall, Anglin, &
Demetriades 1998;Velmahos, Souter, Degiannis, Mokoena, & Saadia 1994).
We feel that this chart allows a methodical examination of the structures
involved in penetrating neck injury and serves as a template for notes and
research. Its universal adoption would allow better communication (Atta &
Walker 1998).
Emergency Treatment
ABC approach
Direct pressure to control bleeding
Immediate transfer to hospital
Thorough clinical examination
Operate or investigate
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Figure 4: From Demetriades D, Asensio JA, Velmahos G et al; Surgical
Clinics of North America 76:664, 1996 (with permission)
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Investigations
Investigations available Indications
Plain lateral cervical spine X-
Ray
All patients
CT Stable patients with foreign
body, laryngotracheal or
oesophageal injury suspected
Angiography Injury to all Zones I-III in
haemodynamically stable pts*
Colour flow Doppler 4 QUOTE
"(Demetriades, Theodorou,Cornwell, III, Weaver, Yellin,
Velmahos, & Berne
1995;Demetriades, Theodorou,
Cornwell, Berne, Asensio,
Belzberg, Velmahos, Weaver, &
Yellin 1997;Ginzburg et al.
1996;Peter Corr, ATO Abdool
Carrim, & John Robbs 1999)"
Adve
rtise
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