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7 Neuroprotection for neonatal encephalopathy Neonatal encephalopathy accounts for 1 million deaths worldwide and even greater numbers of disabled survivors In countries with excellent maternity services NE occurs in 2-3/1000 births with 1-2/1000 developing moderate/severe NE Mortality is about 30% and disabilities occur in about 50% of survivors following moderate/severe NE Cognitive function may be impaired even in mild/moderate cases
8 Development of therapeutic hypothermia for perinatal asphyxial encephalopathy Academic research. Cooksey: A Review of UK Health Funding Chart 7.1 Implementation Surveillance Audit
9 Study Cooled : Controls Gluckman (CoolCap trial) (2005) Shankaran, (NICHD trial) (2005) Azzopardi (TOBY trial)(2009) Cooling method Temp o C (core) Duration Cooling (hours) Primary outcome 116:118 Selective Rate of death + severe disabilities 102:106 Systemic Rate of death + moderate + severe disabilities 163:162 Systemic Rate of death + severe disabilities Li (2010) 38:44 Systemic Rate of death + severe disabilities Simbruner (neo.nneuro.netwo rk trial) (2010) 64:65 Systemic Rate of death + severe disabilities Zhou :116 Selective Rate of death + severe disabilities Jacobs (ICE trial) (2011) 110:111 Systemic Rate of death + severe disabilities Followup period 18 months 18 months 18 months 18 months 18 months 18 months 24 months
10 Does it work: death or severe disability to 18 months of age
11 Effect of therapeutic hypothermia on rate of intact survival at 18 months
12 Key neurological outcomes at months following therapeutic hypothermia Death or disability Bayley MDI <70 Cerebral palsy Intact survival All P <0.01 Controls Cooled Risk ratio (95% CI) 405/ / ( ) 110/324 89/ ( ) 150/ / ( ) 109/ / ( ) Number needed to treat (95% CI) 6 (4-9) 10 (6-25) 8 (6-14) 7 (6-14)
13 Outcome at 6-7 years (NICHD study) Primary Outcome: Hypothermia Control N=97 N=93 Death or IQ< 70 46/97 (47%) 58/93 (62%) Secondary Outcomes: Death 27/97 (28%) 41/93 (44%) Death or CP (moderate/severe) 38/92 (41%) 55/91 (60%) Adjusted RR (95% CI) 0.78 ( ) 0.66 ( ) 0.73 ( )
14 Cooling is now standard of care in UK infants with hypoxic ischaemic encephalopathy NICE guidance on cooling treatment for neonatal encephalopathy BAPM statement
15 The size of the problem in the UK Neonatal encephalopathy in a UK population (South London) women enrolled 150 cases with NE (92 with fits) 143 cases HI No seizures N=56 Seizures N=87 Annual births in UK: Expected No with HIE: 1875 Expected No with seizures: 1143 Incidence of HIE 2.5/1000 births 61% with seizures
16 UK TOBY Cooling Register Protocol / Guidance / data forms
17 TOBY Register Cooling centres
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19 Unanswered questions about cooling therapy Unlike pharma studies, dose, duration of treatment and indications not fully worked out in preliminary studies
20 Unanswered questions about cooling therapy Which infants should be cooled? Gestation range? Other asphyxial conditions? Metabolic disorders? What depth/duration of cooling? Is it safe to cool below 33C? Should cooling be extended beyond 72 hours When is treatment futile? Does cooling affect prognostic assessment?
21 Criteria for offering cooling A. Infants 36 completed weeks gestation admitted to the neonatal unit with at least one of the following: Apgar score of 5 at 10 minutes after birth Continued need for resuscitation, including endotracheal or mask ventilation, at 10 minutes after birth Acidosis within 60 minutes of birth (defined as any occurrence of umbilical cord, arterial or capillary ph <7.00) Base Deficit 16 mmol/l in umbilical cord or any blood sample (arterial, venous or capillary) within 60 minutes of birth B. Seizures or moderate to severe encephalopathy, consisting of: Altered state of consciousness (reduced response to stimulation or absent response to stimulation) and Abnormal tone (focal or general hypotonia, or flaccid) and Abnormal primitive reflexes (weak or absent suck or Moro response) Infants who meet criteria A and B may be considered for treatment with cooling.
22 Additional criteria
23 Recovery No encephalopathy Continue normothermia Resuscitation Follow standard NLS procedures Encephalopathy Start passive cooling and continuous temperature monitoring Step 1 Birth to 1 hour of age Passive cooling with continuous rectal or axillary temperature monitoring. Record temperature every 15 minutes. Start CFM monitoring. Step 2 1 to 6 hours of age Assess baby for treatment criteria A and B Criteria not met: Cooling not appropriate Start slow rewarming Criteria met: Inform parents Start active cooling
24 Key clinical characteristics of infants notified to the UK TOBY Cooling Register from December 2006 to July 2011 Characteristic n=1384 Gestational age at birth, weeks (n=1350) Median {IQR} [Range] Birth weight, grams (n=1379) Median {IQR} [Range] Age when cooling commenced, hours (n=1331) Median {IQR} [Range] 40 {38.4 to 41.1} [34.0 to 44.4] 3340 {2900 to 3800} [1530 to 5830] 3.3 {1.5 to 5.5} [0 to 35.3] Cooled before gestational age of 36 weeks, n (%) (n=1348) 38 (2.8) Outcome at discharge, n (%) (n=1362) Discharged home Transferred to a different hospital Died before discharge Outcome at 2 yrs, n (%) (n=226) Died after discharge and before 2 years Cerebral Palsy (n=206) 912 (67) 172 (13) 278 (20) 6 (3) 51 (25)
25 Percentage (95% CI) with clinical seizures Clinial seizures by year of registration (n=1255) Year of registration Chi-square test for trend (1 df) = 13.0, p< Percentage (95% CI) with severely abnormal aeeg Severely abnormal aeeg by year of registration (n=1121) Year of registration Chi-square test for trend (1 df) = 12.3, p< Apgar score at 10 minutes by year of registration (n=1113) 0 Base excess by year of registration (n=1167) Median (IQR) Apgar score at 10 minutes Year of registration Non-parametric test for trend = 3.1, p=0.002 Median (IQR) base excess Year of registration Non-parametric test for trend = 5.1, p<0.001 Change in clinical condition of infants reported to Register from
26 Clinical characteristics of infants notified to the UK TOBY Cooling Register and survival at discharge Characteristic Seizures before cooling commenced, n (%) (n=1263) Severely abnormal aeeg, n (%) (n=1129) Apgar score at 10 minutes, (n=1127) Median {IQR} Cord gas ph, (n=1298) Median {IQR} Base excess, (n=1175) Median {IQR} Thompson encephalopathy score, (n=551) Median {IQR} Alive at discharge (n=1084) Died before discharge (n=278) p value 585 (58%) 163 (64%) (28%) 188 (81%) < {4 to 7} 3 {0 to 5} < {6.8 to 7.0} 6.8 {6.7 to 6.9} < {-21.0 to -13.6} {-25.0 to -17.2} < {4 to 12} 15 {12 to 16} <0.001
27 Does cooling affect prognostic assessment? Cooling may alter prognostic value of clinical examination (Pediatr Jan;152(1):55-8) Predictive value of aeeg altered by cooling (Pediatrics Jul;126(1):e131-9) MRI is a good predictor of outcome (Lancet Neurol Jan;9(1):39-45).
28 Effect of hypothermia by severity of encephalopathy
29 Therapeutic Hypothermia Changes the Prognostic Value of Clinical Evaluation of Neonatal Encephalopathy Moderate encephalopathy on day 4 after birth Favourable outcome Cooled group Unfavourable outcome Non cooled group Pediatr Jan;152(1):55-8
30 Outcome following hypothermia by persisting encephalopathy Cooled infants Encephalopathy grade at day 4 Moderate encephalopathy Severe encephalopathy Good outcome 31/45 (69%) 3/28 (11%) Pediatr Jan;152(1):55-8
31 Predictive value of clinical examination Clinical assessment of encephalopathy strongly associated with outcome A persistent (3-4 days) moderate encephalopathy does not exclude recovery following cooling A persistent (3-4 days) severe encephalopathy indicates a poor outcome despite cooling
32 PPV of an abnormal aeeg (BS, LV, or FT) to predict poor outcome (death/disability) in hypothermia-treated or normothermia-treated infants Thoresen M et al. Pediatrics 2010;126:e131-e139
33 Predictive value of aeeg within 6 hours of birth (TOBY trial data) PPV Cooled Not cooled Number DDIS Not DDIS DDIS Not DDIS Cooled Not Cooled 0 Moderate Severe Norm/Mod Severe/ContSeiz DDIS= death or disability
34 Predictive value of aeeg within 6 hours of birth (TOBY trial data) 0,8 0,8 0,7 0,7 0,6 0,6 0,5 0,5 PPV 0,4 Cooled PPV 0,4 Cooled 0,3 Not Cooled 0,3 Not Cooled 0,2 0,2 0,1 0,1 0 Discont BS CLV FT 0 Disc/BS BS/CLV/FT CLV/FT
35 Predictive value of aeeg during 72 hours of cooling (unpublished data) PPV of aeeg PPV 1 0,9 0,8 0,7 0,6 0,5 0,4 0,3 0,2 0, CNV DNV BS CLV FT CLV+FT Hours after birth
36 Predictive value of aeeg following hypothermia A poor outcome following cooling occurs in about 33% of infants with a moderately abnormal trace (discontinuous/burst suppression pattern) and in about 60% of infants with a severely abnormal trace (flat trace or chronic low voltage pattern) within six hours after birth
37 Predictive value of aeeg following hypothermia A severely abnormal trace (flat trace or chronic low voltage pattern) persisting more than hours is associated with a poor outcome in >90% of infants
38 Predictive ability of major MRI abnormalities during first 4 weeks after birth for death or severe disability at 18 months Cooled Non-cooled Sensitivity Specificity Positive predictive value Negative predictive value 0 88 ( ) 0 82 ( ) 0 76 ( ) 0 91 ( ) 0 94 ( ) 0 68 ( ) 0 74 ( ) 0 92 ( ) Data are proportions (95% CI). Major MRI abnormalities were defined as moderate or severe basal ganglia or thalamic lesions, severe white matter lesions, or an abnormal posterior limb of the internal capsule. Lancet Neurol Jan;9(1):39-45
39 When is treatment futile? Combination of flat/low voltage EEG with stage 3 encephalopathy beyond hours is ominous It may reasonable to redirect care before 72 hours of cooling therapy MRI could support clinical assessment
40 Summary Hypothermia is neuroprotective in neonatal asphyxial encephalopathy Effect is modest but very important clinically Organisation of local services and use of local protocols are necessary as cases occur unexpectedly and relatively infrequently Prospective surveillance of treatment with cooling may help refine treatment protocols
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