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63
Journal of Neurology, Neurosurgery, and Psychiatry 1992;55:63-64
SHORT REPORT
Clinical features of Todd's post-epileptic paralysis
Loren A Rolak, Paul Rutecki, Tetsuo Ashizawa, Yadollah Harati
Abstract
Two hundred and twenty nine patients
with generalised tonic-clonic seizures
were prospectively evaluated. Fourteen
were identified who had transient focal
neurological deficits thought to be Todd's
post-epileptic paralysis (PEP). Eight of
these 14 patients had underlying focal
brain lesions associated with the postictal
deficits. All patients with PEP were weak,
but there was wide variation in the pattern (any combination of face, arm, leg),
severity (plegia to mild), tone (spastic,
flaccid, or normal), and reflexes
(increased, decreased, or normal). Significant sensory loss occurred in only one
patient. The only other signs of PEP were
aphasia (in five patients all with underlying lesions) and gaze palsy (in four
patients). Post-epileptic paralysis persisted from half an hour to 36 hours (mean of
15 hours). Post-epileptic paralysis may
occur with the first seizure or after many
years of seizures and does not appear
after every seizure. The clinical features
of PEP are thus heterogeneous.
Houston Veterans
Affairs Medical Center
and Baylor College of
Medicine, Houston,
Texas, USA
L A Rolak
P Rutecki
T Ashizawa
Y Harati
Correspondence to:
Dr Rolak, Department of
Neurology, Baylor College of
Medicine, 6501 Fannin,
NB302, Houston, Texas
77030, USA
Received 18 February 1991.
Accepted 2 May 1991
Patients and methods
We prospectively evaluated all patients admitted to one hospital during a one year period
with generalised tonic-clonic seizures, defined
as the sudden onset of bilateral symmetrical;
tonic and clonic convulsive activity with loss of
consciousness. Some patients could have had a
very brief unwitnessed focal onset to their
seizure (partial seizure with secondary generalisation), but every effort was made to exclude all
patients with any focality in the beginning or
subsequent course of their seizure. All patients
had a thorough neurological exam-ination
immediately after the seizure and at about two
hour intervals until all neurological deficits
returned to baseline. All patients also had brain
imaging with contrast CT scanning or MRI,
EEG, and other appropriate diagnostic tests.
Results
Two hundred and twenty nine patients (all
men, mean age 46 years) presented with generalised tonic-clonic seizures, of whom 14
(mean age 47 years) had transient focal postictal deficits (PEP). Their clinical features are
summarised in the table. Eight of the 14
Bravais in 1827 first noted that paralysis may patients with PEP had an underlying structural
follow a unilateral seizure, a condition he lesion, which in each case was a pre-existing
termed hemiplegia epileptique.' Todd used the ischaemic stroke in the hemisphere consame term (epileptic hemiplegia), apparently
tralateral to the paralysis. All strokes were in
arrived at independently, in his 1854 descrip- the middle cerebral artery territory, affecting
tion.2 He noted that paralysis may occur on the frontal or temporal lobe. Only 51 of the 215
only one side even when both sides had been patients without PEP had structural lesions (X2
convulsed and that in contrast to the spasticity 769, p < 0-01). Altogether, 69 of the 229 had
expected from a central nervous system lesion, structural lesions and eight had PEP. All
the limbs were flaccid. By 1890, Hughlings patients with PEP had weakness, but it varied
Jackson had extended these observations and from very mild paresis to complete plegia. The
described post-epileptic aphasia, sensory loss, weakness involved any combination of face or
stupor, and mania.3 Since then post-epileptic arm or leg. The tone could be flaccid, normal, or
paralysis (PEP) has become a well accepted spastic, and the reflexes decreased, normal, or
syndrome, and numerous post-epileptic symp- increased. Very miniimal sensory deficits
toms have been reported, including hemia- occurred in eight patients but only one comnopsia,4 complete blindness,5 weakness,&-I plained of noticeable numbness. Five patients,
unilateral pupillary dilatation,"2 aphasia,'3 all with pre-existing left hemisphere strokes,
bulimia,'4 and prolonged confusion.'5 These developeui aphasia, which was fluent in one and
descriptions, however, are all in the form of non-fluent in four. The only other neurological
deficit seen in PEP was gaze palsy, in four
case reports, and there has never been a prospective, systematic analysis of PEP to describe patients.
Post-epileptic paralysis persisted from half
its fundamental clinical features, such as
incidence, physical findings, duration, and rela- an hour to 36 hours, with a mean of 15 hours.
tion to underlying pathology. Focal findings are The nature, duration, and severity of PEP were
especially vexing after generalised (as opposed unrelated to the duration or severity of the
to partial) seizures because there is often no seizures, the presence or absence of underlying
structural (focal) brain lesion to account for lesions, or any changes on the EEG. Weakness
them. We studied the clinical characteristics of always persisted longer than other symptoms.
Post-epileptic paralysis occurred sporadically
PEP after generalised tonic-clonic seizures.
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64
Rolak, Rutecki, Ashizawa, Harati
Table Clinicalfeatures ofpatients with post-epileptic paralysis (PEP)
Age
(years)
Duration of
epilepsy (years)
Cause of
seizures
50
10
2
3
4
5
6
7
28
25
31
36
28
51
1st seizure
15
1
3
5
1st seizure
Alcohol
withdrawal
Idiopathic
Idiopathic
Idiopathic
Idiopathic
Idiopathic
Stroke
8
54
1st seizure
Stroke
9
48
1
Stroke
10
11
61
63
10
8
Stroke
Stroke
12
70
6
Stroke
13
47
8
Stroke
14
66
24
Stroke
Patient
1
Weakness
EEG
Severity
NL
0/5
4+/5
NL
NL
NL
NL
NL
Focal
theta
Focal
spikes
+ delta
Focal
spikes
+ delta
NL
Focal
theta
Focal
spikes
+ delta
Focal
spikes
+ theta
NL
Pattern
Tone
Duration of
PEP (hours)
Reflexes
Extensor plantar
Yes
Gaze palsy
8
NL
No
No
No
No
No
No
None
Numbness
None
None
None
Gaze palsy
36
4
24
24
18
6
No
Gaze palsy +
aphasia
12
Other signs
F, A, L
l
4/5
4/5
4+/5
3/5
4/5
A
A, L
F, A, L
A, L
A, L
A, L
NL
NL
NL
NL
0/5
A, L
l
4 + /5
A
NL
NL
No
Aphasia
24
4/5
4/5
F, A
L
NL
T
t
NL
No
No
Aphasia
Aphasia
36
8
0/5
F, A, L
1
No
Gaze palsy
6
4/5
A, L
NL
NL
No
None
05
4/5
A, L
t
T
Yes
Aphasia
8
It
T
T
I
t
NL
F = face, A = arm, L = leg, t = increased, I = decreased, NL = normal.
and did not follow every seizure. Some patients
had suffered recurrent seizures for years before
their first episode of PEP, and most had subsequent seizures without associated PEP.
There was no apparent reason why some
seizures resulted in PEP and others did not. Six
patients with PEP had a baseline abnormal
EEG (see table), which in each case showed a
slow wave (theta or delta) focus in the contralateral frontal or temporal lobe, corresponding to an underlying ischaemic stroke. Four of
the tracings also had epileptiform spike activity
accompanying the focal slowing. Only one
patient (number 2, with idiopathic seizures)
had an EEG recorded during his PEP, and it
showed no abnormality.
Discussion
Transient focal neurological deficits after an
epileptic seizure are often called Todd's
paralysis in recognition of their description by
the British neurologist Robert Todd.2 Since
then, research has focused primarily on possible mechanisms of post-epileptic paralysis,"6
but its clinical features have never been systematically studied, and there is almost no
information about the nature, duration, or
aetiology of the deficits that occur after a
seizure. Our conclusions about PEP are limited
by the population studied (adult male veterans)
and the restriction to generalised tonic-clonic
seizures without ictal focality. In this group,
PEP was a heterogeneous syndrome encompassing a variety of neurological signs including
aphasia, gaze palsy, weakness, and (rarely)
numbness. The motor deficits were highly
variable, from mild to severe, flaccid to spastic,
focal to hemiparetic. Abnormalities never
persisted beyond 36 hours. Most patients with
PEP had an underlying structural lesion but,
interestingly, in many (43%) no cause was
found. The aetiology of PEP is not clear. It may
be due to neuronal exhaustion from hypoxia or
substrate depletion because a localised region
of the brain is already damaged or is more
severely affected by the seizure, or because some
underlying condition, such as vascular disease,
predisposes to insufficient metabolism.6 Alternatively, it may result from inhibitory neuronal
discharges,7 arterial venous shunting,8 9 or
release of endogenous inhibitory (possibly
opioid) substances."6 Our study, though not
intended to address the aetiology of PEP,
demonstrates its great clinical diversity and
thus suggests that it may have multiple causes.
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l'epilepsie hemiplegique. Paris: Faculte de Medecine de
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brain, and other affections of the nervous system. London:
John Churchill, 1854;284-307.
3 Jackson JH. The Lumleian lectures on convulsive seizures.
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11 Youkey JR, Clagett GP, Jaffin JH, et al. Focal motor seizures
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Clinical features of Todd's post-epileptic
paralysis.
L A Rolak, P Rutecki, T Ashizawa and Y Harati
J Neurol Neurosurg Psychiatry 1992 55: 63-64
doi: 10.1136/jnnp.55.1.63
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