Nishiyama & Hanaoka: TRAUMATIC ASPHYXIA
1101
death.4 In animal experiments, no animal survived
compression by five times its own weight for longer
than 10 min.5 This 14.2 kg child was under a vehicle
with a weight of more than 2000 kg (500 kg per
wheel), which was about 150 times (37.5 times if con-
sidering the weight per wheel) of his body weight, for
about three minutes. Although this resulted in con-
siderable compression, he recovered without any
sequella perhaps due to the short duration of the com-
pression and due to the elasticity of his chest. The
details of the compression were not known. In con-
sidering the tire mark the wheel might not stay on one
part but moved on the body for three minutes and this
may be another reason why the damage was so light.
One more important factor influencing the outcome
may be the orientation of the compression. In this
case, the tire mark was predominantly over the left
upper abdomen and left chest. This might spare the
constrictions of cardiac output and venous return such
that the child’s neurological status on arrival was very
good. If the wheel had rolled onto the midchest at
right angles to the long axis of the body, the result
might have been worse.
Petechia were seen only on the upper part of the
body. Petechia formation is thought to occur because
blood is forced out of the right atrium through the
valveless innominate and jugular veins into the head and
neck by positive pressure transmitted to the medi-
astinum from the compressed chest or upper
abdomen.6 This sudden increased pressure in small
venules and capillaries causes rapid dilatation and
minute hemorrhages, producing the petechia. Due to
the same mechanisms, visual disturbances occur in some
cases.7 Therefore, opthalmological follow up is impor-
tant. The present case had no opthalmological abnor-
malities revealed by fundoscopy.
The reason why cyanosis, petechia and edema are
confined to the upper part of the body may be because
the lower part of the body is protected from the elevat-
ed venous pressure by a series of valves.8 Alternatively,
increased airway pressure may compress or obliterate
the inferior vena cava to protect the lower part of the
body.9 Although cyanosis, petechia and edema were
seen only in the upper part of his body, serum concen-
trations of liver enzymes increased and hematuria was
observed in the present case. These abnormalities might
have resulted from direct abdominal compression, as
evidenced by the tire mark on the abdomen, and/or
increased venous pressure transmitted to liver and kid-
ney. He had no radiographic liver or renal injury neces-
sitating surgical treatment.
chest compression but no apparent edema was detect-
ed by computed tomography.
Traumatic asphyxia may also be complicated by
serious thoracic injuries including pneumothorax,
hemothorax, rib fractures or flail chest, and mediasti-
nal injuries, and head injuries.1 0 Even with those com-
plications, the mortality rate is usually low in
children.10 This child was also fortunate not to have
incurred more severe chest trauma, given the mecha-
nism of elastic chest cage.
At first we did not diagnose his right iliac fracture.
The boy had no complaints, perhaps due to bed rest
and depressed consciousness, and because it was diffi-
cult to confirm the fracture line of a small child on
plain pelvic radiographs. Examining physicians should
be aware that subtle associated injuries may be pre-
sent, especially in small children with disturbed con-
sciousness.
Usually the prognosis of traumatic asphyxia is good
with no long-term disability when the patients have no
complicated injuries,6 , 8 except that visual disturbance
may continue.7 The child in the present case had the
potential for serious injury, but recovered without any
impairment. In managing traumatic asphyxia, it is impor-
tant to pay particular attention to detect and treat com-
plicating injuries including opthalmological examination.
Acknowledgment
We would like to thank Professor Chingmuh Lee MD,
Department of Anesthesiology, University of
California Los Angeles School of Medicine, for his
helpful comments.
References
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The boy was lethargic but recovered in four days.
Lethargy have been due to hypoxia or brain edema by
8 Landercasper J Cogbill TH. Long-term followup after
traumatic asphyxia. J Trauma 1985; 25: 838–41.