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Degenerative Intellectual & Developmental Disabilities

Re-Visiting the Role of Intra-Partum Cardio-Tocography (I-P CTG) In Cerebral Palsy Jurisprudence: Time to Take Cognizance

George Gregory Buttigieg KM*

University of Malta, Matla

*Corresponding author: George Gregory Buttigieg KM, University of Malta, Matla

Submission: November 16, 2017; Published: January 08, 2018

Volume1 Issue2
November 2017

Abstract

Both clinical obstetrics as well the relevant medico-legal litigation were severely led down by false scientific conclusions emanating from the USA in the 1960's. The false assumptions considered birth asphyxia as the predominant cause of newborn Cerebral Palsy and proclaimed the just introduced fetal cardio-tocography (CTG), as the great saviour from CP through the detection of intra-partum hypoxia. Although today, fifity odd years later, science that neither conclusion is correct, CTG has retained its misplaced strength in CP litigation. Not only does it still hold much pre-eminence in both UK and US jurisprudence, but sometimes, it constitutes the sole basis of discussion.

The only scientifically valid and practical way of correction is the recognition that CP due to intra-partum hypoxia has the underlying hallmark pathology of Hypoxic Ischaemic Encephalopathy (HIE). This constitutes no more than 20% of CP. Other aspects of obstetric care, including in the antenatal period may have a basis for alleging negligence, but CP due to peri-partum hypoxia must be accompanied by HIE. The 2003/2014 criteria for diagnosing HIE were established by the American College of Obstetricians in liaison with the American Academy of Pediatricians. This provides a reliable guide to the diagnosis by integrating clinical obstetrics/neonatology/midwifery observations, fetal/ newborn biochemical data, newborn cerebral MRI/ MRI spectroscopy imaging, and evidence of fetal multisystem organ failure. This must be the new parameters on which CP jurisprudence should be justly and scientifically based.

Introduction

In cases alleging medical negligence as a cause of Cerebral Palsy, it is still the general rule that Cardio-tocographic (CTG) analsysis is the brunt of evidence brought forward by the plaintiff, in both UK and USA. Furthermore, it is not unusual for intra-partum CTG (I-P CTG) analysis, with or without fetal acid-base confirmation of fetal stress, to be the sole evidence, on which the defendant's fate is determined. While accepting that intra-partum CTG evidence is essentially the only parameter of assessing fetal response to the stress of labour, the extra-polation of this investigation as the sole medico-legal evidence of negligence as causative of Cerebral Palsy, is no longer tenable1. Although not directly relevant to the validity of this statement, one should also bear in mind that Cerebral Palsy constitutes 60-70% of the total yearly malpractice sum paid by the UK NHS Litigation Authority2.

Hypoxic ischaemic encephalopathy

I-P CTG, by itself, cannot establish a diagnosis of fetal hypoxia and acidosis. Even in a bad case scenario, an abnormal I-P CTG tracing, the incidence of fetal hypoxaemia and acidosis can be confirmed in only 50-60% of cases3. Here, we shall not dwell on the myriad pitfalls of I-P CTG interpretation such as intra- and |inter-observational errors, limitations, its high specificity and low sensitivity...leading to the "shifting sands phenomenon" of this ubiquitously used investigation. However, an abnormal I-P CTG tracing is an indication for confirming or negating intra-uterine hypoxia such as by Fetal Blood Sampling (FBS), with or without one of the more modern methods such STAN.

The crucial question is whether the fetal hypoxia and subsequent acid-base disturbance was severe enough to cause Hypoxic Ischaemic Encephalopathy (HIE), the underlying cerebral lesion contributing to the estimated 20% of Cerebral Palsy caused at birth (70% are due to prenatal causes and about 10% by post-natal causes). Although liability through negligence may also operate antenatally e.g. a mismanaged chorio-amnionitis, the discussion here centres on alleged negligence in labour with resultant fetal hypoxia. In fact, one may surmise that the vacuum caused by the diminution of alleged labour mismanagement as based on unjustified I-PCTG analysis, will eventually shift on justifiable antenatal management scrutiny. However, sticking with the facts here, any intra-partum hypoxia proved to be present by acid-base/STAN confirmation of I-P CTG tracing abnormality must be shown to have induced HIE. This should be the crux of medico-legal argumentation alleging negligence. And how does one show this, clinically and in a practical way for the Courts to analyse and reflect upon?

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1buttigieg GG (2017) Lessons from the Great Medico-Legal Chapter of Cerebral Palsy. J Neurol Disord 5: 335.

2http://www.nhsla.com/safety/Documents/Ten%20Years%20of%20Maternity%20Claims%20-%20An%20Analysis%20of%20the%20NHS%20LA%20 Data%20-%20October%202012.pdf

3Hinshaw K, Ullal A (2007) Peripartum and intra-partum assessment of the fetus. Anaesthesia& Intensive Care Medicine 8: 331-336.

The ACOG as light bearer

It was in the 1960's, that the cause of Cerebral Palsy in general was wrongly honed on labour and that oxygen deprivation was he cause. We now know that this is the cause of the great minority of cases but the damage was done and is still operative today. Pre- 1970 related malpractice claims were few4, but by 1985, they comprised 10% of all medical malpractice lawsuits5. A yet all studies have shown that in spite of universal use of I-P CTG monitoring, Cerebral Palsy incidence has not been diminished. To quote a recent study: Consequently, there is a lack of confidence, marked variation in FHR interpretation, defensive practices, unnecessary operative interventions, and a failure to recognise abnormal FHR patterns, resulting in adverse outcomes and expensive litigation6.

However, it was also the USA, through the American College of Obstetricians and Gynaecologists, in conjunction with the American Academy of Pediatrics (AAP) which has been the first to rectify the original misconceptions. For, although not addressing the medico-legal aspect directly, the ACOG, through its Task Force Report of 2003,7 further amended in 2014, 8 has shed the first logical guidance to the establishment of HIE. By the creation of a core group and a secondary group of criteria it correlated clinical, neurological, biochemical, neuroimaging evidence of cerebral hypoxic ischaemia as well as similar evidence of damage in other organs in a logical and scientific basis to establish the evidence of the presence HIE.

The significance and implication of the ACOG-AAP criteria on present Cerebral Palsy jurisprudence

It is most medico-legally instructive that the principal or core criteria of the ACOG classification does not even include I-P CTG. It includes:

a) Apgar score of less than 5 at 5 minutes and 10 minutes.

b) Fetal umbilical artery pH less than 7.0, or base deficit greater than or equal to 12 mmol/L, or both.

c) Neuroimaging evidence of acute brain injury seen on brain magnetic resonance imaging or magnetic resonance spectroscopy consistent with hypoxia-ischemia.

d) The presence of multisystem organ failure consistent with hypoxic-ischemic encephalopathy.

The second group includes CTG among other parameters. The message is loud and clear. It is also simple and brilliant in that the scope of I-P CTG is the detection of fetal hypoxia-the ACOG HIE criteria demand evidence of such hypoxia - biochemical, through neuro-imaging and by the presence of organ failure resulting from hypoxia. CTG monitoring has not been displaced from its key monitoring position in cases of high risk labour. But its role as key factor in establishing an underlying link to Cerebral Palsy through HIE has been put in its correct place.

On reflecting on the significance ofthis ACOG- AAP Classification, the paltry value of I-P CTG jurisprudence purely based on plaintiff- defendant squabbles on early or late decelerations, variability... becomes clear.

Light at the end of the tunnel

Ifthe march of science is a slow one, that of medico-legal practice is even slower. It has taken close to 60 years for the Bolam test to be toppled ( and that only as regards disclosure of information) by the House of Lords in Nadine Montgomery Appellant against Lanarkshire Health Board Respondent9, even though it had been overtly challenged before, as in Rogers v Whitaker10. The ACOG HIE criteria classification and its interference to Cerebral Palsy litigation is unlikely to hit home any time soon. Yet one does take heart on perusal of contemporary case law.

In AW Pursuer against Greater Glasgow Health Board Defenders 11 [29], we find a UK case about alleged medical negligence leading to Cerebral Palsy. The argumentation was for from being I-P CTG oriented, comprising as it did thirteen experts from obstetrics, midwifery, biochemistry, neuro-radiology, neurology and neonatology. The ACOG-AAP criteria were not referred to by name but it was there in spirit. This is the right and fair, unequivocal and all-encompassing way forward for justice to prevail in Cerebral Palsy adjudication.

However it would be encouraging to conclude with one case, out of several, where the scientific aspect of case presentation in Cerebral Palsyelicits admiration. One such is AW Pursuer against Greater Glasgow Health Board Defenders [29], a UK case where the Court arguments are based on an argumentation augmentation of the ACOG-AAP criteria even if this is not referred to as such. A total of thirteen experts were involved between plaintiff and defendant, covering issues of obstetrics, neuro-radiology, neurology, neonatology and midwifery.

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4Cerebral Palsy Fact Sheet (2017) United Cerebral Palsy.

5DeVille KA (1990) Medical Malpractice in Nineteenth Century America: Origins and Legacy. New York, NY: New York University Press.

6Ugwamadu A (2014) Are we (mis)guided by current guidelines on intrapartum fetal heart rate monitoring? Case for a more physiological approach to interpretation. BJOG 121(9): 1063-1070.

7The American College of Obstetricians and Gynecologists' Task Force (2003) Neonatal encephalopathy and cerebral palsy, The American College of Obstetricians and Gynecologists, the American Academy of Pediatrics. Neonatal encephalopathy and cerebral palsy: Defining the pathogenesis and pathophysiology. Washington, DC: The American College of Obstetricians and Gynecologists. 2003: 1-85.

8ACOG Executive Summary (2014) Neonatal encephalopathy and neurologic outcome. (2nd edn) Obstetrics and Gynecology 123: 896-901.

9Nadine Montgomery Appellant against Lanarkshire Health Board Respondent -2015 S.C.C.L.R. 315

10Rogers v Whitaker (1992) 175 CLR 479.

11AW Pursuer against Greater Glasgow Health Board Defenders. CSOH 99 (2015)

This is the correct way to truly evaluate medical liability in Cerebral Palsy litigation. It is a far cry from two experts warring over whether a CTG artefact is significant or not. Once CTG oriented evidence is given its correct weighting, along with Apgar scores, fetal oxygen saturation and acid base status at birth, neuroimaging evidence of the new-born's brain along with evidence of oxygen deprivation in other fetal structures, and justice will have to struggle hard to be effected.

© 2018 George Gregory Buttigieg KM. This is an open access article distributed under the terms of the Creative Commons Attribution License , which permits unrestricted use, distribution, and build upon your work non-commercially.



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