ctg masterclass a v ma annual clinical negligence conference 2012
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CTG Masterclass A V MA Annual Clinical Negligence Conference 2012. Professor Tim Draycott, Consultant Obstetrician Health Foundation Improvement Science Fellow. Birth care not always easy. Introduction. Cerebral Palsy Pattern of injury Relationship with low Apgar score Standard of care - PowerPoint PPT PresentationTRANSCRIPT
CTG MasterclassAVMA Annual Clinical
Negligence Conference 2012
Professor Tim Draycott, Consultant ObstetricianHealth Foundation Improvement Science Fellow
Birth care not always easy
Introduction
• Cerebral Palsy – Pattern of injury– Relationship with low Apgar score
• Standard of care– Intermittent Auscultation– Electronic Fetal Monitoring
• Interpretation• Action required
• Cases
Low Apgars and CP
• Base Excess ≤12 likely to be normal• Apgar score <7
– Odds ratio for CP after low (<7) Apgar scores at 5 minutes in tern infants is 3.72
– Proportion of CP in the population that could be attributed to a low Apgar score (<7) at 5 minutes is 10.9%
– At least 50% of Low Apgar scores could be prevented with better care
Recurring Themes
• Failure to perform EFM• Failure to recognise CTG
abnormalities• Failure to respond to CTG
abnormalities:• Fetal blood sampling• Expedite delivery
Cerebral Palsy
Proportion CP
Spastic Diplegic 26%Hemiplegic 35%Ataxic 4%Athetoid (Dyskinetic)
7-15%
Spastic Tetraplegic 18-20%
..and Clinical Negligence
Proportion CP
Intrapartum
Spastic Diplegic 26% <1%
Hemiplegic 35% 0%
Ataxic 4% 0%
Athetoid (Dyskinetic)
7-15% 80%
Spastic Tetraplegic
18-20% 45% +
Clinical Negligence
• Standard of care• Breach in duty of care
– Midwives– Obstetricians– Paediatricians
• Did that breach cause the injury ?
Causation
• Athetoid Dyskinetic Cerebral Palsy– Acute profound hypoxia
• Spastic Tetraplegic Cerebral Palsy– Chronic partial ischaemia
Athetoid CP
• Profound acute hypoxia - ‘lack of oxygen’– Uterine Rupture
– VBAC
– Cord Prolapse– Abruption
Hypoxia
• Oxygen sensitive parts of body– Kidneys– Heart– Brain
MRI findings
• Areas of brain with high metabolic rate– Deep grey matter
• Posterior parts of lentiform nuclei• Ventro-lateral nuclei of thalami• Hippocampus
MRI
Spastic Tetraplegic CP
• Mechanism of injury less established
• Prolonged period of mild – moderate hypotension– Cord Compression– Head Compression
• Watershed areas of brain
Chronic Partial Ischaemia• Low blood pressure in cerebral
arteries• Perfusion at peripheries
reduced• Lawn Sprinkler
MRI Findings
Intrapartum
• Monitoring fetal heart rate in labour– Intermittent Auscultation– Cardiotocograph
• Baseline rate• Baseline variability• Accelerations• Decelerations
• Introduction only
Intermittent Auscultation• Normal Labour
– The RCOG EFM guideline recommends:• In the active stages of labour, intermittent
auscultation (IA) should occur after a contraction, for a minimum of 60 seconds, and at least.
– every 15 minutes in the first stage – every 5 minutes in the second stage
• Failure to perform IA as above is substandard care
When to change to EFM ?
Cardio-tocography
• Abdominal palpation• Maternal pulse• Name/number/time/paper speed• Technically adequate • Documentation (actions & opinion) • Interpret in light of clinical setting
Reassuring CTG
• 4 Features: – Baseline rate
110-160– Baseline
variability - 5bpm or more
– Accelerations– No
decelerations
Intrapartum
• Standard of care– NICE EFM May 2001– NICE Intrapartum Guideline Sept 2007
– Pre 2001 – FIGO guidance published in 1987
NICE EFM
Coalface
Reassuring Non- reassuring AbnormalBaseline rate(bpm)
110 – 160 100 – 109161 - 180
<100>180
Comments:-
Variability(bpm)
5 bpm or more <5 for 40 mins ormore but <90 min
< 5 for 90 mins ormore
Comments:- CTG onfor 60 mins so far
Accelerations Present None Comments:-
Decelerations None EarlyVariableSingle prolongeddeceleration up to 3mins
Atypical variableLateSingle prolongeddeceleration > 3mins
Comments:-Unprovokeddecelerations
Opinion Normal CTG(All f our featuresreassuring)
Suspicious CTG(One non-reassuringfeature)
Pathological CTG(two or more non-reassuring or one ormore abnormal features)
Dilatation Not assessed Comments:- Not contracting Contractions ….:10Action Urgent transf er to tertiary unit and review by senior obstetrician
Date ……………………… Time………………… Signature………………………………………………. Status………………………….
Classification
Actions - Suspicious
Action - Pathological
NICE IP ‘Guide’line
New Sticker
Antenatal Sticker
Dr C BRAVADO
• Discuss risk• Contractions• Baseline Rate• Accelerations• Variability• Accelerations• Decelerations• Outcome
However……….
• DrCBravado not consistent with:– Electronic Fetal Monitoring
Guideline, published in 2001– NICE Intrapartum Guideline in 2007
• Therefore its use is substandard care
Breach of Duty
• Assessment of CTG• Classification into NICE
category• Documentation, each hour• Appropriate action for CTG
category
Causation – CP Template• Fetal, umbilical arterial cord, or very
early neonatal blood: pH <7.00 & base deficit >12 mmol/l
• Severe or moderate neonatal encephalopathy in infants >34 weeks
• Spastic quadriplegic or dyskinetic CP• Exclusion of other identifiable causes
CP Template contd
• Sentinel hypoxic event• Sustained fetal bradycardia or poor
variability in the presence of late or variable decelerations
• Apgar scores of 0-3 beyond 5 minutes (previously <7).
• Onset of multi-system involvement within 72 hours of birth.
Causation and timing
• Paediatric expert• Use of umbilical artery base excess:
Algorithm for the timing of hypoxic injury
Ross and Gala. Am JOG. 2002
– >10% infants born with Base Excess ≥16 will have cognitive defects at 1 yr
– Almost all infants born with base excess ≤ 12 are normal
Timing of Injury
• Normal Labour• Fetus enters labor with a base excess of –2
mmol/L– 1 mmol/L per 3 to 6 hours in normal first stage of
labour– 1 mmol/L per hour of second stage
• Abnormal CTG– 1 mmol/L per 30 minutes with repetitive typical
severe variable decelerations– 1 mmol/L per 6 to 15 minutes in subacute fetal
compromise– 1 mmol/L per 2 to 3 minutes with acute, severe
compromise (eg, terminal bradycardia)
Timing
• A guide, not an exact science • At what time would delivery
have avoided injury ?• Work backwards through trace
• Intermittent Auscultation
Pitfalls
• Cord Gas better than expected– Venous sample– Complete cord compression
• MRI– Other causes
• Chronic Partial – May not have sentinel event
Conclusion
• Breach of duty of care– Use NICE EFM & IP Template– Action also defined by national
guidance• Causation
– ACOG & International consensus template
Problem ?
• 50% adverse outcomes preventable with better care
CESDI – 4th Annual Report. 1997CEMD – Why Mothers Die. 1998
CEMACH – Saving Mothers Lives 2007
• UK Apgar <7 at 5 mins• Ranges from 0.4% of term infants to
1.96%• 5 fold variation !
Neonatal Outcomes
5’ Apgar p=0.00042 (Chi2 test for trend)HIE p=0.0176 (Chi2 test for trend)
National Results
Thankyou
• www.prompt-course.org• [email protected]