903

Electric Injury With Cerebral
Venous Thrombosis
Case Report and Review of the Literature
A. Patel, MD, FRCPC, and R. Lo, MD, FRCPC
Background and Purpose: A case of accidental electrocution with previously unreported arteriographic
evidence of cerebral vein thrombosis is presented. A brief description of early and late neurological
complications and current theories attempting to explain the histopathological findings of electric injury
are reviewed. The occurrence and persistence of late neurological complications are elucidated.
Case Description: A report of an accidental electrocution with 800 V of alternating current in a young
man is presented. Cerebral angiography showed a cerebral vein thrombosis. The immediate complications
included loss of consciousness, confusion, memory loss, and headache. Late complications of right-sided
clumsiness, sensory loss, hemianopsia, and neglect persisted for more than 1 year despite the brain being
outside the current pathway.
Conclusions: High-voltage electric injury may cause cerebral vein thrombosis with significant early and
delayed brain injury even when the brain lies outside the current pathway. (Stroke 1993;24:903-905)
KEY WoRDs * electric injuries * thrombosis

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E lectric injuries are common, but fortunately few
are fatal. The severity of electric injury depends on voltage, skin resistance, current, and
pathway of the current within the body. Exposure to
more than 25 V is potentially dangerous,' but fatal
accidents have been reported with voltages as low as 46
V.2 Alternating current with frequencies of 40-150 Hz is
twice as dangerous as direct current of the same voltage
because it induces tetanic muscle contraction, causing
the victim to become locked to the point of contact with
the current.23 The current selects the shortest pathway
from contact to contact and passes through tissue as
through a structureless gel.4
In this report we describe a case of an accidental
electrocution in a young man who was struck by 800-1,500
V. The case is interesting because of the rarity of surviving
a high-voltage shock and because of the development of
an intracerebral venous thrombosis, which has not previously been reported after electrocution.

Case Report
A 31-year-old right-handed Vietnamese man was
admitted to the hospital after an electric shock injury.
His right hand contacted a capacitor with a 15,000-V
capacity while he was repairing a microwave oven 3 days
before admission. The capacitor had been unplugged
for 3 minutes, and the patient estimated that he suffered
a shock with approximately 800 V of alternating current.
He felt a "shocklike" sensation in both arms and his
From the Departments of Medicine (A.P.) and Neurology
(R.L.), McMaster University Medical Centre, Hamilton, Canada.
Address for correspondence: Dr. R. Lo, 710-155 James Street
S., Hamilton, Ontario, Canada, L8P 3A4.
Received June 18, 1992; revision received January 12, 1993;
accepted February 15, 1993.

head. Soon afterward, he apparently lost consciousness
for 5-30 minutes. His coworker found him sitting dazed
in the room. He complained of a severe headache,
redness in his right arm, and weakness in his right arm
and leg. His wife noticed periodic confusion and deterioration of his recent memory. His medical history was
unremarkable, and he was taking no medications.
Physical examination on admission revealed an alert
man in no acute distress who was oriented to time,
place, and person. He had a right visual field defect,
right facial numbness, and a mild numbness and weakness in his right arm. Deep tendon reflexes were 3 + and
symmetrical. There was an upgoing toe on his left foot.
Laboratory investigations included normal blood
count, sedimentation rate, electrolytes, blood sugar,
liver enzymes, and complement (C3 and C4) levels.
Chest x-ray film and electrocardiogram were normal.
Antinuclear antibody, rheumatoid factor, cold agglutinins, and hepatitis screen were negative. Protein C,
protein S, antithrombin III, and plasminogen levels
were normal. A computed tomographic (CT) scan of
the head with and without contrast enhancement was
normal. Cerebrospinal fluid analysis including cell
count, glucose, protein, and cultures was normal. An
echocardiogram was normal. An electroencephalogram
(EEG) showed left parietal slowing with irregular theta
elements and sharp waves. A cerebral angiogram
showed a thrombus at the distal end of the vein of
Labbe (a superficial vein traversing the temporoparietal
cortex) on the left side projecting into the transverse
sinus (Figure 1). There was also patchy filling of the left
internal cerebral vein and the left vein of Galen, which
was suggestive of thrombus.
One month later the patient showed no clinical
improvement. A repeat cerebral angiogram showed

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Stroke Vol 24, No 6 June 1993

FIGURE 1. Angiogram showing a thrombus (arrow) obstructing the distal left (L) vein of Labbe.

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persistence of the thrombus. A 6-month trial with
warfarin resulted in no improvement.
Over the next 2 years there was gradual improvement,
but the patient's gait remained ataxic and he had a
constant headache and memory problems. Psychological testing demonstrated poor concentration, and he
was withdrawn and depressed.
Discussion
The clinical effects of electric injury may be classified
into immediate and late manifestations. The immediate
manifestations include cardiac and respiratory arrest,
loss of consciousness, motor and sensory disturbances,
amnesia, and confusion. The longer the period of
unconsciousness, the more severe are the amnesia and
confusion that follow. Old age, fatigue, atherosclerotic
arterial disease, and hypothyroidism may lower an individual's susceptibility to electric injury.5
The late manifestations may be divided into focal and
nonfocal deficits and may occur days to months after the
electric injury. Focal deficits include cerebral (hemiplegia, aphasia), spinal (transverse myelitis, progressive
muscular atrophy, amyotrophic lateral sclerosis), and
peripheral nerve (neuropathies, radiculopathies) manifestations.5'6 Nonfocal symptoms such as psychoneurotic
behavior, personality changes, confusion, amnesia, and
headache are common, and their occurrence is not
restricted to cases in which the brain lies in the electric
current pathway. Abnormal EEGs have been documented in cases in which the brain is outside the current
pathway.6'7 In this case there were prominent nonfocal
findings, and the brain was outside the current pathway.
Despite this, the EEG showed left parietal abnormalities. Although the CT scan was normal in this case,
abnormalities that have been described include basal
ganglia and parieto-occipital hemorrhages, basal ganglia hematoma, and basilar artery thrombosis.8 There
10

are no reports of intracerebral venous thrombosis after
electric injury.
Four theories have been considered to explain the
histopathologic findings of electric injury. The electrostatic theory" suggests that if the victim is not
grounded, electric charges build up in the body, producing electrostatic effects. Particles with similar charges
repel each other, resulting in a sudden expansile force
of the body tissues that gives rise to waves of decompression under the skin. This may account for the tissue
rupture seen at autopsy, but it does not explain the
unilateral predominance of clinical effects or abnormalities beyond the current pathway. The vascular theory8
suggests vasoconstriction as the mechanism of the acute
manifestations. Intimal injuries and subsequent vascular
thrombosis may account for the delayed manifestations.
Animal studies have shown that pial vessels constrict
when exposed to electric stimulation.12 The heat theory8
suggests thermal injury to the brain tissue as the mechanism for the pathological findings. Cerebrospinal fluid
temperatures as high as 145°F have been recorded 5
hours after legal electrocution. The mechanical theory11
suggests that the injury is caused by a violent jarring of
the tissue by the electrical current. Critically ill burn
patients possess three predisposing factors associated
with venous thrombosis: prolonged immobilization, hypercoagulability, and changes in blood volume and
blood vessel permeability.13,14 This complication is rare
and occurs only in patients with severe burns. Our
patient had minimal burns despite the high-voltage
shock.
It appears that no single theory will explain all the
pathological findings, and it is conceivable that a combination of the mechanisms mentioned above may play
a role in the production of the histopathologic changes.
In our patient, the current pathway was from the right
arm to the legs. The immediate effects included loss of
consciousness, confusion, memory loss, and headache.
This was followed by right-sided clumsiness, sensory
loss, hemianopsia, and neglect. The latter symptoms
persisted for a year, and he was left with a persistent
headache, personality change, and short-term memory
deficit.
The focal clinical findings were corroborated by the
EEG and angiographic abnormalities in the left parietal
region. His personality change, memory loss, and headache reflect a more diffuse and bilateral cortical involvement. The intracerebral venous thrombosis is likely a
marker of the extent of the vascular injury at that
particular region rather than the cause of all his symptoms. The intracerebral venous thrombosis may be
explained by the vascular theory (vasospasm and intimal
damage). An alternative or concomitant mechanism for
the intimal damage may be related to the heating effect
of the electricity. Hypoxic damage may have contributed
to the central nervous system findings.
There is no evidence to guide the use of anticoagulation in a patient who has an intracerebral thrombosis.
Our patient received anticoagulant medication for 6
months without showing significant benefit. The patient
refused to have a repeat cerebral angiogram after

anticoagulation.
This patient demonstrated that cerebral manifestations may occur even when the brain is outside the
shortest current pathway. Diffuse cerebral dysfunction

Patel and Lo Electric Injury With Cerebral Vein Thrombosis

is common and may be long lasting. In patients with
nonfatal electric injury, routine investigations may include CT scan and EEG. Further investigations such as
cerebral angiography may be of value even if the CT
scan is normal.

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