Evidence Relevant to Order
33In addition to the matters which I have earlier referred to dealing with what happened to the plaintiff and Dr Harbord's opinion as to her condition, it is relevant to identify the specific evidence relied upon by the defendant for the purposes of this motion.
34In a report dated 23 September 2012, Professor Ouvrier expressed this conclusion:
"In summary, examination showed a moderately to severely intellectually disabled young lady with mild clumsiness and fine motor disability and relative weakness of the right hand. The neurological findings would best be described as a developmental dyspraxia - 'clumsy child syndrome' - are in the mild range of ataxic cerebral palsy. The right limbs are more affected than the left. There was also a relatively mild postural scoliosis."
35He also said:
"I am of the view that Ms Plowman's clinical picture is probably all attributable to the events which occurred in the perinatal period and that the findings are due to hypoxic ischemic brain damage suffered at that time. There are some slightly unusual features to the case in that the clinical picture in this term infant is not one of spastic quadriparesis or athetoid/dyskinetic cerebral palsy, but appears to be a more clinically localised form but with substantial intellectual deficit. While the clinical findings mentioned are consistent with the distribution of the white matter and atrophic lesions shown on the brain scan, they are somewhat atypical. ...
Because of the issues raised above, I believe that it would be appropriate for Ms Plowman to have a CGH array genetic test in order to explore the alternative possibility that there might be an underlying genetic alteration which has contributed to her intellectual deficit. "
Later reports of Professor Ouvrier deal more specifically with the question of CGH testing.
36In a report dated 22 August 2013, Professor Ouvrier expressed the opinion that CGH array testing detected chromosomal disturbances in up to 20 per cent of children with otherwise unexplained intellectual handicap with or without other physical abnormalities. He pointed out that the performance of a CGH array test involved a collection of blood by venipuncture.
37He went on to explain the proposed test in this way:
"A CGH array has a higher diagnostic capacity than a routine chromosomal analysis (karyotype).
There is evidence to attribute Emma's intellectual disability with associated neurological abnormalities to hypoxic-ischemic damage. There are some aspects of the case which raise the question as to whether there is an additional alternative diagnosis, either causative of, or contributing to, her intellectual disability.
A CGH array could provide information that would identify a number of alternative causes for the disabilities mentioned above.
On the other hand, it does not, by any means, rule out the possible causes of intellectual disability other than certain chromosomal aberrations or disturbances detectable by this particular technique."
38Professor Ouvrier went on to identify what he described as certain ethical considerations which would need to be addressed. He said:
"As a result of the above ethical and practical implications, it is customary for people to be given genetic counselling before they undertake such tests.
On the other hand, there is a definite possibility, probably of the order of 10 per cent or more, that the findings could alter in a very substantial way the allotment of causation of Emma Plowman's intellectual disorder and provide an alternative explanation to the proposed hypoxic-ischemic basis of her condition."
39In a further report dated 12 October 2013, Professor Ouvrier said this:
"I am certainly not of the view that such a degree of intellectual impairment could not result from the perinatal hypoxic-ischemic injury which I have accepted as the likely cause of Ms Plowman's cerebral palsy. I am concerned, however, that there may be an additional reason contributing to Ms Plowman's moderate to severe intellectual handicap. ... In retrospect, the wording would more appropriately have been:
'On the other hand, there is a definite possibility, probably in the order of 10 % or more, that the findings (of a CGH array) could alter in a very substantial way the allotment of causation of Emma Plowman's intellectual disorder and provide an additional explanation to the proposed hypoxic-ischemic basis of the cognitive aspects of her condition'. " (emphasis in original)
40In light of criticism of his approach by Dr Harbord, Professor Ouvrier sought to make plain what he was suggesting. He said:
"In this case, I think that Dr Harbord may have misinterpreted my intentions in suggesting a CGH array. They were not seek an alternative diagnosis to hypoxic-ischemic encephalopathy but to look for other potential genetic influences which may have increased the level of intellectual disability, which is the most serious of Ms Plowman's handicaps".
41He concluded with this expression of opinion:
"In Ms Plowman's case there is an adequate explanation for her findings, but the relative discrepancy between the physical findings and the level of intellectual disability may indicate an additional causative factor, such as a chromosomal abnormality".
42Professor Ouvrier went on to say that the test was a matter of taking venous blood usually from the patient's arm, and that such testing could be done at any authorised pathology collection service.
43Dr Harbord was asked by the solicitors for the plaintiff to address the issue of the CGH array testing. Dr Harbord had previously examined the plaintiff for the purposes of evidence in the proceedings generally. I have earlier, at [18], referred to his opinion.
44In a report dated 9 September 2013, Dr Harbord said this:
"Emma therefore has a mild right hemiparesis form of cerebral palsy with fairly substantial atrophic changes throughout the brain more marked on the left side than the right side, plus an intellectual disability. Her clinical outcome is therefore entirely consistent with the widespread damage seen on her MRI scan, as a result of birth asphyxia.
Emma does not have an isolated intellectual disability. She has widespread brain damage with associated motor and cognitive impairment. I therefore disagree with Professor Ouvrier's assessment that there is likely to a 10 per cent or more possibility that Emma has a chromosome abnormality to account for her brain damage."
45In a further report of 5 November 2013, Dr Harbord said this:
"I agree with Professor Ouvrier that in general those with a more severe form of cerebral palsy tend to have a more severe intellectual disability, but there is also a well-recognised group of those with birth asphyxia who have minimal or no motor impairment but a significant intellectual deficit. In particular, research articles have established that there is a link between the watershed pattern of injury as seen on the MRI scan, that is similar to Emma's, and the outcome of a significant intellectual disability, in the absence of a motor disorder."
46Dr Harbord went on to refer to a series of published articles which supported his view, and then referred specifically to the MRI scan of the plaintiff which was performed on 28 July 2009. Of the findings of that scan, Dr Harbord said:
"This was considered to be a watershed pattern of insult, and was considered to be in keeping with a hypoxic ischemic injury around the time of birth. There was no abnormal signal within the basal ganglia, and no evidence of cortical dysplasia or migration anomaly.
...
If Emma did have a CGH array performed, and this found a chromosome abnormality that has been associated with an intellectual disability, in my opinion this would not be the sole explanation for her intellectual problems. In Emma's case, birth asphyxia has caused brain damage as is evident on her MRI scan. And associated with this watershed pattern of damage, she has an intellectual disability. In my opinion, it is extremely unlikely that any CGH array abnormality would account for the watershed pattern of injury seen on her MRI scan.
In my opinion if a CGH array abnormality was found, this would be an additional but not alternative cause for intellectual disability and the hypoxic brain insult would still be a cause for her intellectual disability."
47The opinions of Professor Ouvrier and Dr Harbord were contained in reports which were either exhibited to or annexed to affidavits placed before the Court. Neither Professor Ouvrier nor Dr Harbord attended for oral examination or cross-examination.
48To the extent that their reports differed, any such differences have not been explored in evidence before the Court, and have been dealt with only by submission by the parties.