|Year : 2019 | Volume
| Issue : 2 | Page : 550-559
Clinical, brain imaging, and electroencephalogram evaluation of cases of cerebral palsy with epilepsy
Hassan A Hassan1, Abdel N.Biomi Mohamed2, Mohammad A.Hady Mohammad1, Mohamed A Gebreel1, Waleed A Hamed1
1 Department of Pediatrics, Faculty of Medicine, Al Azhar University, Cairo, Egypt
2 Department of Radiology, Faculty of Medicine, Al Azhar University, Cairo, Egypt
|Date of Submission||10-Dec-2018|
|Date of Acceptance||23-Jun-2019|
|Date of Web Publication||24-Oct-2019|
MD Mohamed A Gebreel
MD Pediatrics, 7105 street 9 Almokatam, Cairo, 11571
Source of Support: None, Conflict of Interest: None
Background Cerebral palsy (CP) is a chronic disorder of movement and posture. It is the result of a nonprogressive damage of immature nervous system caused by several factors that have occurred in prenatal, perinatal, or postnatal periods. Epilepsy is one of the most common problems among patients with CP.
Objectives The aim of the study was to evaluate patients with epileptic CP by clinical findings, electroencephalogram (EEG), as well as cranial MRI findings.
Patients and methods This cross-sectional study was conducted on 70 patients, seen at pediatric neurology clinics at Al-Azhar University Hospitals. All patients were subjected to detailed medical history, detailed general and neurological examination, EEG, and MRI brain.
Result Spastic quadriplegia was the most common type, seen in 29 (41.4%) cases. Generalized tonic–clonic seizure was the most common type of convulsion in our cases (42.9%). EEG abnormalities were commonly seen in CP with epilepsy (78.6%). The most common MRI scan abnormalities in epileptic children with CP were brain atrophy.
Conclusion Spastic quadriplegia is the most common type of CP associated with seizures. EEG is a useful tool in detecting types of electrical discharges. MRI is the most useful tool in detecting the etiology of CP.
Keywords: cerebral palsy, electroencephalogram, epilepsy, MRI
|How to cite this article:|
Hassan HA, Mohamed AN, Mohammad MA, Gebreel MA, Hamed WA. Clinical, brain imaging, and electroencephalogram evaluation of cases of cerebral palsy with epilepsy. Sci J Al-Azhar Med Fac Girls 2019;3:550-9
|How to cite this URL:|
Hassan HA, Mohamed AN, Mohammad MA, Gebreel MA, Hamed WA. Clinical, brain imaging, and electroencephalogram evaluation of cases of cerebral palsy with epilepsy. Sci J Al-Azhar Med Fac Girls [serial online] 2019 [cited 2020 Feb 26];3:550-9. Available from: http://www.sjamf.eg.net/text.asp?2019/3/2/550/269873
| Introduction|| |
Cerebral palsy (CP) is a disorder of movement and posture, caused by a nonprogressive brain disease that usually occurs perinatally . The most frequent complaint is delayed motor development at the appropriate age . Its incidence has not declined in recent years despite advances in both obstetric and neonatal care . It is a common problem with an incidence of 2 to 2.5/1000 live births. The most common pathological findings of CP are white matter injury owing to cerebral ischemia or hemorrhage especially in preterm infants .
It is the most common cause of motor disability as well as cognitive impairment in children . Its types are well known and established. A study showed that 33% of the patients were hemiplegic, whereas 44% were diplegic, and 6% were quadriplegic . Others have stated that hemiplegia is the most common form of CP among term neonates, and second to diplegia among children born premature ,. It results from inflammation with excessive cytokine formation and oxidative stress with excess release of glutamate stimulating the excitotoxic cascade . This cascade was induced by hypoxic ischemic and infectious mechanisms ,.
Epilepsy is one of the most common problems among patients with CP. It is defined as two or more unprovoked seizures . It has been used as a marker of severity and prognosis of such patients ,. It occurs owing to diffuse cortical malformations and perinatal arterial ischemic stroke ,,.
Incidence of epilepsy varies widely depending on the underlying etiology and pathology in CP ,. In patients with CP, they have symptomatic epilepsy which may continue into later life . It occurs in 15–60% of patients with undefined course ,,. Children with CP may experience extensive brain injury including the cortex, white matter, and central nuclei, and therefore, they are liable to develop epilepsy . In certain types of CP, there are higher rates of epilepsy, as approximately one-third of the patients with CP exhibit seizures, and this figure is proportional to the degree of motor and cognitive disabilities ,,. Although the white matter damage is the most common abnormality, but combined gray and white matter abnormalities are more common among children with hemiplegia ,. In contrast, isolated gray matter damage is the least common finding in CP. In preterm babies, periventricular white matter lesions occurred more often than in term children (90 vs. 20%, respectively) .
The aim of the study was to evaluate patients with epileptic CP by clinical findings, electroencephalogram (EEG), as well as cranial MRI findings.
| Patients and methods|| |
This cross-sectional study was conducted on 89 patients with CP associated with epileptic seizures. Only 70 of them fulfilled our inclusion criteria, comprising 40 (57.1%) males and 30 (42.9%) females, and their ages ranged from 4 months to 10 years seen at pediatric neurology clinics at Al-Azhar University Hospitals from January 2011to July 2012. This study was approved by the Hospital Research Ethics Committee and has been performed in accordance with the ethical standards as in Declaration of Helsinki (1964) and its later amendments, and a written informed consent was obtained from patient’s family. A questionnaire was designed, and data were collected. The following data were recorded: age, sex, age of onset of seizures, type of CP, and type of epilepsy. A questionnaire was filled out also with maternal medical and obstetrics history. Available birth records of the children with CP were reviewed.
All participants were subjected to the following:
Thorough medical history, including personal (age, sex, order of sibling, and consanguinity); perinatal history, with stress on specific complications of pregnancy, premature rupture of membranes, prolonged labor, meconium staining of liquor, and preterm labor (before 37 weeks of pregnancy); postpartum variables, including low-birth-weight babies (below 2.5 kg at birth), birth asphyxia, prolonged jaundice, or NICU admission; and family, past, and developmental histories.
Detailed general and neurological examination with stress on motor system examination as well as cognitive and intellectual assessment was done.
EEG and MRI brain were done for all cases.
All children with CP with epilepsy of more than 1 month and age less than 10 years were included. CP was defined as motor disabilities caused by nonprogressive damage to the developing brain . It is divided into the spastic, dyskinetic, ataxic, and mixed subtypes . The spastic subtype is further divided into unilateral (one side of the body is involved) and bilateral (both sides of the body are involved) types. The spastic bilateral type was further subdivided into quadriplegia and diplegia . Epilepsy was diagnosed according to Commission of Classification and Terminology. Active epilepsy was considered when two or more unprovoked seizures occurred ,,,.
Interictal EEG and cranial (MRI) findings were evaluated.
- Interictal models of EEG were performed using different modes of EEG machines. The electrodes were placed according to 10–20 international system of electrode placement. Bipolar as well as referential montages were applied. Sleep records were also obtained using chloral hydrate (50 mg/kg body weight orally). Awake EEG was also obtained for older children using hyperventilation and photic stimulation as provocative methods.
- Brain MRI was performed using: 1.5 T superconductive magnet (GE, Kurnbach, Germany).
Examination was performed using standard head coil: the patient was placed supine and positioned comfortably using a knee cushion with the head on the head rest. Head fixation band was used to prevent any movements. MRI scan included axial 10 mm weighted spin echo 500/10-16/1-2 (TR/TELNEX), axial 10 mm T2-weighted spin echo 3000–4000/98-105/1-2 (TR/TE/excitations, ms), and coronal fast spin echo 5 mm, 4000/105 (TR/TE/NEX).
The data were collected and entered into the personal computer. Statistical analysis was done using Statistical Package for the Social Sciences (SPSS, version 20) software. Arithmetic mean and SD were used for categorized variables. χ2 test was used categorical variables, whereas for numerical data, t test was used to compare groups. The correlation was analyzed by Spearman correlation coefficients. The level of significance was 0.05.
| Results|| |
In our study, 57.1% were males, whereas 42.9% were females ([Table 1]). Their ages ranged from 4 months to 10 years ([Table 2]).
Our study showed that spastic quadriplegia was the most common type of CP, representing 41.4%, followed by spastic hemiplegia (20%), spastic diplegia (17.1%), mixed (14.3%), and athetoid (7.1%) ([Table 3]).
Our study showed that 47.1% of the patients with CP developed their first attack of seizures within a year of birth, 34.4% from 1 to 6 years, and only 18.3% after their sixth birthday ([Table 4]). Generalized tonic–clonic convulsions were the most common type (42.9%) followed by partial seizures (20%), infantile spasm (14.3%), myoclonic seizures (11.4%), and partial onset with secondary generalization (11.4%) ([Table 5]). These seizures are controlled in 48 (68.6%) cases, whereas 22 (31.4%) cases were uncontrolled, as shown in [Table 6].
|Table 4 Distribution of age at onset of seizures among epileptic cerebral palsy patients|
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|Table 6 Seizures control in children with cerebral palsy in different types|
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We did EEG for all cases. The abnormalities were generalized activity in 48.6%, focal activity in 18.6%, and focal onset with secondary generalization in 11.4%, whereas it was normal in 15 cases (21.4%) ([Table 7]).
|Table 7 Electroencephalogram finding in cerebral palsy patients with epilepsy|
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We did MRI brain for all cases (70) and found that the most common finding was cerebral atrophy (44.3%) followed by periventricular leukomalacia (PVL) (10%), basal ganglia abnormalities (11.4%), old infarcts (8.5%), incomplete pachygyria (5.7%), delayed myelination (4.3%), intracranial hemorrhage (5.7%), brain malformation (2.9%), arachnoid cyst (2.9%), and brain calcification (2.9%). On the contrary, normal MRI finding in one case was diagnosed as spastic diplegia (1.4%) ([Table 8]).
Case 1 was a 7-year-old full-term male baby delivered by vaginal delivery. The patient presented with spasticity of four limbs. Generalized tonic–clonic seizures started at 1 year.
Case 2 was a 5-year-old preterm male patient delivered by cesarean section who presented with focal motor seizure on the left side (partial seizure) at 1.5 years, with delayed milestones and spasticity on the left side.
Case 3 was a 6-month-old preterm male baby delivered by cesarean section who presented with spasticity of four limbs, with generalized tonic–clonic seizures started at neonatal period.
Case 4 was a 1.5-year-old full-term male baby, delivered by normal vaginal delivery, presented by generalized myoclonic seizures at 4 month, with delayed milestone, spasticity of four limbs, and abnormal movements (mixed CP) ([Figure 1],[Figure 2],[Figure 3],[Figure 4],[Figure 5],[Figure 6],[Figure 7],[Figure 8]).
|Figure 2 EEG shows generalized spike, high amplitude, and after going background suppression and slow wave. EEG, electroencephalogram.|
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|Figure 3 Axial MRI brain shows ischemic infarction at right occipital region.|
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|Figure 4 (a) Periventricular leukomalacia and (b) periventricular leukomalacia.|
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|Figure 5 EEG shows generalized discharges of 3–4 Hz spike/multiple spike and slow waves. EEG, electroencephalogram.|
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|Figure 6 EEG shows epileptiform discharges (generalized spike and slow waves). EEG, electroencephalogram.|
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|Figure 7 EEG shows slow spike wave complexes. EEG, electroencephalogram.|
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| Discussion|| |
We evaluated 70 patients with CP with epilepsy and found that 47.1% of them developed epilepsy within a year of birth, 34.3% of them had seizures onset from 1 to 6 years of age, and l8.6% had seizures onset after the age of 6 years. This is in agreement with Aksu  who found that 38.5% of patients with CP developed their first attack seizure by 1 year, whereas Kwong et al.  reported a higher incidence, where ∼74% of children with epileptic CP had seizure onset in the first year of life, 34% had seizures from 1 to 6 years old, and 19% had seizures at older than 6 years. Other study done by Senbil et al.  found the age of onset of epilepsy of less than 12 months of age was seen in 51% of epileptic CP cases. On the contrary, Gururaj et al.  found that epilepsy in children with CP was presented in 78.6% of cases in the first year of life ,. Bax et al.  found that 74% of the children with CP had their first seizure less than 12 months.
In our study, we found that generalized tonic–clonic seizure was the most common type of epilepsy (42.9%) (30 patients) followed by partial seizure in 14 (20%) patients, infantile spasm in 10 (14.3%) patients, partial onset with secondary generalization in eight (11.4%) patients, and myoclonic seizures in eight (11.4%). These generalized tonic–clonic seizures were common in spastic quadriplegic and spastic diplegic, whereas partial seizure was more common in spastic hemiplegic CP. This is in agreement with Senbil et al.  who found that generalized tonic–clonic seizures represented 45% of seizures in patients with CP. In other studies, generalized tonic–clonic seizures represented 38.1% of convulsions in patients with CP with high incidence in spastic diplegia, followed by infantile spasms (22%), then myoclonic seizures (l4.3%) and partial seizures (12.4%) . Zafeirious et al.  found generalized tonic–clonic seizures in 44.4% of epileptic CP cases, simple partial seizures 32%, myoclonic seizures 25.2%, secondary generalized tonic–clonic 12.9%, and partial complex seizures 11.2%. Another study by Hamdy et al.  reported that 39.3% of children with CP had partial seizure, 32.1% had generalized tonic–clonic seizures, 14.3% had myoclonic seizure, 5.4% had infantile spasms, 5.4% had atonic, and 4.5% had unclassified/mixed seizure type.
Niedermayer  clarified that the generalized epileptic activity can be attributed either to a genetic predisposition, or to a quick secondary bilateral synchronization. On rare occasions, deep subcortical cerebral lesion can also generate this kind of epileptic activity. The present study demonstrated that epilepsy in children with CP is controlled in 68.6% of cases but uncontrolled in 31.4% of cases according to its type. We studied seizures contol in different types of patients and found that 11/12 were controlled in spastic diplegia, 12/14 in spastic hemiplegia, 18/29 in spastic quadriplegia, 4/10 in mixed and 3/5 in athetoid so overall controlled in 48/70.
The abnormalities in EEG of our cases were 78.6%, representing 55 cases, whereas EEG was normal in 15 (21.4%). These abnormalities were generalized activity in 48.6%, focal activity in 18.6%, and focal onset with secondary generalization in 11.4%.
Normal EEG does not exclude epilepsy. Generalized activity is common in generalized tonic–clonic seizure, infantile spasm, and myoclonic seizure. Focal activity is common in partial seizure. Focal onset with secondary generalization is common in partial onset with secondary generalization. In our study, we noticed that abnormal EEG findings were predominant in spastic quadriplegic CP. However, normal EEG findings were predominant in spastic diplegic CP. Singhi et al.  stated that EEG abnormality seen in children with CP with epilepsy was 70.5%. These abnormalities included generalized activity, focal activity, and focal with secondary generalization, and 29.5% of cases had normal EEG findings. Aksu  and Delgado  reported that focal or secondary generalized activity EEG was common in children with CP. A study by Zafeirious et al.  stated that focal and generalized slowing was higher in the patients with epileptic CP (22.5 and 48.9%, respectively). Süssová et al.  reported a higher ratio of EEG focal disorder in patients with right hemiparetic CP. In contrast, Kwong et al.  demonstrated that generalized activity EEG was less frequently observed in patients with CP, whereas polymorphic seizure types were more common .They also observed more frequently partial seizures with secondary generalized in patients with epileptic CP. Data from studies involving 1918 children found that 43% (range, 35–62%) of children with CP developed epilepsy . The prevalence of epilepsy varies depending on the type of CP that is present. Children with spastic quadriplegia have 50–94% epilepsy, whereas hemiplegics have about 30% incidence of epilepsy. The least prevalence was observed in patients with diplegia or ataxic CP at 16–27% . In patients with dyskinetic CP, it may be difficult to differentiate partial complex seizures from dyskinetic movements . American Academy of Neurology concluded that although ∼45% of children with CP develop epilepsy, there is no evidence that EEG was useful in determining the etiology of CP as seen in retrospective studies involving 2014 patients with CP .In our study, cranial MRI findings were abnormal in 69 (98.6%) out of 70 cases and normal in only 1 (1.4%) case. These abnormalities were cerebral atrophy (44.2%) (the most common finding) followed by PVL (11.4%), basal ganglia abnormalities (10%), old infarcts (8.5%), incomplete pachygyria (5.7%), intracranial hemorrhage (5.7%), delayed myelination (4.3%), brain malformation (2.9%), arachnoid cyst (2.9%), brain tumor (2.9), and brain calcification (2.9%). Data from studies on 620 patients found that MRI scans were abnormal in 332/335 (99%) in preterm infants, 251/272 (92%) in term infants, and 23/29 (79%) infants older than 1 month ,. MRI is the most sensitive tool in detecting PVL, other prenatally acquired lesions, as well as subtle congenital anomalies of brain development ,. Other studies were done on 286 patients showed the percent of patients with an abnormal MRI scan based on the type of CP and revealed that 100% abnormalities was noticed in mixed type of CP, 98% in quadriplegic type, 96% in hemiplegic, 94% in diplegic, 75% in ataxic, 70% in dyskinetic, and 67% in atonic type ,,,. Others reported that the most common MRI patterns in children with CP were periventricular white matter lesions (83%) that occur mainly in preterm infants and only 20% of term infants . In many studies, higher incidence of periventricular changes in preterm infants and gray matter abnormalities in term infants is reported ,. PVL is not uncommon among full-term infants as well as preterms. The study by Kwong et al.  of 122 patients with spastic CP reported one-third of term infants exhibited signs of white matter damage.
Our study was limited by small sample size. Some cases did not fulfill our inclusion criteria either owing to difficulties in achieving MRI or lack of health records. However, this study raises interesting issues requiring further studies involving more investigations such as metabolic screen and genetic study for better assessment and etiological identification of CP.
| Conclusion|| |
Our study confirmed that spastic quadriplegia was the commonest type of CP associated with seizures. Generalized tonic–clonic seizures were the commonest type of seizures followed by partial seizures. Generalized activity in EEG finding was the commonest one. Brain atrophy, PVL, old infarcts, and basal ganglia abnormalities were common MRI scan findings in patients with epileptic CP. MRI is a more sensitive tool in the assessment of brain damage, resulting in perinatal asphyxia and congenital brain malformations. EEG and brain imaging taken together might lead clinicians toward a probable cause of CP.
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[Figure 1], [Figure 2], [Figure 3], [Figure 4], [Figure 5], [Figure 6], [Figure 7], [Figure 8]
[Table 1], [Table 2], [Table 3], [Table 4], [Table 5], [Table 6], [Table 7], [Table 8]