Download presentation
Presentation is loading. Please wait.
Published byAsher Marsh Modified over 9 years ago
1
Neonatal Encephalopathy Julie Parsons, M.D Assistant Professor, Pediatric Neurology November 19, 2009
2
Disclosures PTC Therapeutics PTC 124 Clinical Trial for Duchenne Muscular Dystrophy
3
Objectives To promote understanding between legal and medical professionals To explain the role of a pediatric neurologist To define neonatal encephalopathy To define cerebral palsy To explore the relationship between neonatal encephalopathy and cerebral palsy
4
Pediatric Neurologist A pediatric subspecialist whose expertise is diagnosing and treating disorders in the developing nervous system This requires completion of a five year residency training program Board Certification through the American Board of Psychiatry and Neurology Special Qualification in Child Neurology
5
The Top 10 Neurologic Conditions 1. Attention Deficit Hyperactivity Disorder 2. Seizures and epilepsy 3. Developmental Delay 4. Headache 5. Newborn disorder 6. Mental Retardation 7. Macrocephaly/Microcephaly 8. Motor disturbance 9. Central Nervous system infection 10. Neuromuscular Disturbance
6
Neonatal Encephalopathy A depression in mental status or alteration of consciousness Seizures Abnormal muscle tone and reflexes Abnormal respiratory function
7
Risk Factors for Neonatal Encephalopathy Increased maternal age Family history of neurologic problems Maternal thyroid disease or other autoimmune disorder Coagulopathy or thrombotic disorders Maternal hypertension Vaginal bleeding Maternal infection Infertility Intrauterine growth restriction
8
Sarnat Staging Stage 1:MildStage 2: Moderate Stage 3: Severe Level of consciousness Excessively irritable or somnolent, but awakens with light stimulation Unarousable, but withdraws purposefully Comatose, minimal if any response to pain Brainstem and Autonomic function No brainstem deficits. Sympathetic predominance Parasympathetic predominance Depressed or absent brainstem reflexes. Disordered breathing Motor FunctionTone normal to increased Generalized hypotonia Flaccid
9
Sarnat Staging Stage 1: MildStage 2: Moderate Stage 3: Severe Reflex abnormality Exaggerated deep tendon reflexes Exaggerated deep tendon reflexes: depressed neonatal reflex behaviors Depressed or absent deep tendon reflexes: absent neonatal reflex behaviors Paroxysmal Movements Seizures or myoclonus Sarnat and Sarnat, 1976
10
Correlation of Severity of Clinical Abnormalities and Outcome Severity of Encephalopathy% with abnormal outcome Mild Jittery, increased irritability and DTRs, exaggerated Moro response 0% Moderate Lethargy, hypotonia, suppressed DTRs, + or – seizures 20 % to 40% Severe Coma, hypotonia, seizures, brainstem and autonomic dysfunction, + elevated intracranial pressure 100% Sarnat and Sarnat 1976; Volpe 1995
11
Sarnat and Sarnat Staging Stage 3 More than 7 days at Stage 2 Both associated with poor neurologic prognosis
12
Hypoxic Ischemic Encephalopathy Hypoxia= Lack of Oxygen Ischemia= Lack of Perfusion Hypoxic Ischemic Encephalopathy is caused by a combination resulting in a decreased supply of oxygen to cerebral tissue
13
Hypoxic Ischemic Encephalopathy Recognizable Pattern of Progression 1 st 12 hours—bilateral hemispheric involvement leads to decreased level of consciousness 12 to 24 hours—”apparent improvement” in level of consciousness, but may have seizures which are often refractory 24 to 72 hours—worsening brainstem dysfunction with altered eye movements, abnormal pupillary response, apnea, bulbar dysfunction (may result in death) Persistent dysfunction may indicate thalamic or basal ganglia involvement which usually predicts poor prognosis
14
Diagnosis of HIE: History Complications of pregnancy, labor, delivery Placenta previa, cord prolapse, placental abruption, maternal shock Presence of meconium Placental condition chorioamnionitis Apgar scores (<3 at 5 minutes) Acid Base status (cord pH <7, BE -12) Evidence of multiorgan system involvement Kidney, liver, heart
15
Differential Diagnosis: Neonatal Encephalopathy Sepsis Meningitis Sedation Neuromuscular Disease Trauma Metabolic
16
Sepsis Common antecedent to low Apgar scores and depression Hypotension Seizures Meconium Aspiration Chorioamnionitis Bacterial Infections—Meningitis or Group B Strep
17
Sepsis Inflammation Release of cytokines Widespread endothelial injury Coagulopathies Germinal matrix injury Intraventricular hemorrhage Stroke
18
Metabolic Disorders Biochemical Derangements Hypoglycemia Hypocalcemia Hyponatremia Hyperammonemia Acidosis
19
Metabolic Disorders Inborn Errors of Metabolism Symptoms after hours or days of appearing normal Prominent unexplained vomiting Hyperpnea in absence of lung disease Unusual Odor Family history, or excess fetal loss Physical Exam findings: cataracts, hepatosplenomegaly
20
Diagnosis of HIE: EEG Characteristic Sequence Initially marked suppression of amplitude and slowing 24 to 48 hours discontinuous pattern of burst suppression May deteriorate to isoelectric Rapid resolution of abnormalities favors good prognosis
21
Burst Suppression EEG
22
Diagnosis of HIE: Imaging Cranial Ultrasound—increased echogenicity and effacement of sulci although 50% read as normal Computerized Tomography (CT) 2 to 5 days maximal extent of parenchymal hypodensities Atrophy or multicystic encephalomalacia develops later
23
Diagnosis of HIE: MRI T2 prolongation 12 to 18 hours-transient edema T1 high signal after 3 days T2 shortening after 6 to 7 days denotes permanent injury DWI (diffusion weighted imaging) more sensitive especially in signaling injury to the thalami and basal ganglia. Maximum sensitivity at 2 to 4 days
24
Neuropathology Parasagittal Injury (>34 wks)– spastic quadriplegia Periventricular White Matter in preterm—spastic diplegia Basal Ganglia—acute, near total ischemia associated with poor neurologic outcome chorioathetosis and feeding difficulty Focal/Multifocal– reflects the area of injury Selective Neuronal Necrosis—HIE
25
Normal Cranial CT Scan
26
Cerebral Edema on Cranial CT Scan
27
Hypoxic Ischemic Encephalopathy Basal Ganglia Injury
28
Hypoxic Ischemic Encephalopathy Severe Global Injury
29
Cerebral Palsy A chronic neuromuscular disability of central nervous system origin, characterized by abnormal control of movement or posture appearing early in life and not the result of a progressive disease Intellectual, sensory or behavior problems may accompany but are not a part of the diagnosis Only 10-15% of children with CP have a history of severe hypoxic ischemic encephalopathy (NCPP)
30
Diagnosis of Cerebral Palsy Delayed Milestones Persistence of developmental reflexes Pathologic Reflexes Failure to develop maturational reflexes No progression or loss of skills by history
31
Type of Cerebral Palsy Spastic Choreoathetotic Ataxic Dystonic Ballismic Mixed
32
Clinical Syndromes Spastic Quadriplegia is the form of CP most commonly associated with Hypoxic Ischemic Encephalopathy Spastic Hemiparesis is associated with stroke Athetosis is associated with kernicterus About 30% of children with CP have a brain malformation or cortical dysgenesis
33
Homunculus
34
Association of Neonatal Encephalopathy and CP In <10% of children with CP or MR was there an association with intrapartum or perinatal asphyxia 75% of children with CP had normal Apgar scores Apgar < 3 at 15 min 36% with CP at 20 min 57% with CP Persistently low Apgar scores at 10, 15, 20 min are associated with poor neurologic outcome
35
Criteria for Exposure Birth Asphyxia Clinical history Clinical Markers Abnormal fetal heart rate Meconium Laboratory Markers Fetal Acidosis (cord pH) Newborn Status Apgars Encephalopathy
36
Conclusions ACOG guidelines provide a reasonable framework There is an association between HIE and CP Neonatal Encephalopathy is a non specific clinical syndrome Neonatal Encephalopathy must be documented to consider HIE as causation for CP Continued scientific studies are needed to further understand etiologies of CP
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.