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Diplegia,4 59.9% Were Premature (Polani, 1957, Unpublished Festations of an Intrauterine Abnormality Causing Both Data)

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Diplegia,4 59.9% Were Premature (Polani, 1957, Unpublished Festations of an Intrauterine Abnormality Causing Both Data) 1958 PREMATURITY AND " CEREBRAL PALSY " BRrnsH 11497 DEC.DEC.~~~~20, 20 98PEAUIYAD"EERA AS"MDCJUNL19MEDICAL JOURNAL and Asher and Schonell (1950) show a significant difference PREMATURITY AND " CEREBRAL in the incidence of prematurity between " non-rhesus athe- toids " of 74 and " and " PALSY " (29% cases) paraplegias tetraplegias (44% of 223 patients). The proportion of prematures among BY 104 cases of congenital hemiplegia was reported by Asher PAUL E. POLANI, M.D., M.R.C.P., D.C.H. and Schonell as 30% and by Perlstein and Hood (1953) in their 222 cases as Medical Research National 12%. Unit, Spastics Society, and choreo-athetoid cere- Department of Child Health, Guy's Hospital, London A series of 93 cases of dystonic bral palsyt was analysed (Polani, 1957, unpublished data). Of 28 cases with severe neonatal due to blood- That there is an association between prematurity and jaundice iso-immunization three were (11%); of 20 "cerebral palsy " impressed the earliest students of group premature patients with a history of severe neonatal jaundice not asso- this neurological condition (Little, 1862; Freud, 1897). ciated with blood-group incompatibility 14 were premature Its nature has puzzled many; for some, like Brissaud (70%); and of 45 patients who did not have severe neonatal (1894), the effect of prematurity is to cause a develop- jaundice 16 were premature (35.5%). By contrast, in a mental anomaly of the pyramidal tracts; for others, group of 42 patients with cerebral spastic paraplegia/ like Collier (1924), the two conditions are parallel mani- diplegia,4 59.9% were premature (Polani, 1957, unpublished festations of an intrauterine abnormality causing both data). Thus the association with prematurity seems high in prematurity and primary antenatal degeneration of cerebral palsy due to non-rhesus jaundice and in cerebral cerebral neurones. spastic paraplegia/diplegia. and Kerr confirm the Although data on prematurity are available in the The figures given by Ingram (1954) it is in striking association between cerebral spastic paraplegia/ collection of cases published by Little, largely and Table). These figures suggest recent times that the association between prematurity diplegia prematurity (see and cerebral palsy has been put on a quantitative basis. Survivors, by Birth Weight, Edinburgh, 1948-52 (Ingram and Evans (1948), in 76 cases, and Asher and Schonell Kerr, 1954) (1950), in 400 cases, found an incidence of prematurity No. of Diplegics/ Incidenceper of 39%, about eight times that in the normal population, Birth WeightsBirthWeights Survivors ~~ParaplegicsTotal No. 1,000 while Lilienfeld and Parkhurst (1951), for 505 cases, a of with an incidence of All weights . 36,400 36* 1 give figure 22.2% prematurity Over 5 lb. (2,500 g.) . 35,143 23* 0-65 in their control population (115,281) of 4.8%. It is to 4-51 lb. (1,800-2,500 g.) 1,017 2 196 . 11 45-83 be noted that the controls used by Lilienfeld and Under4 lb. (1,800 g.) 240 end of the first month * Parkhurst were survivors at the Estimated on the basis of the period 1943-7 (33 cases in 35,866 childron). of life, those of Asher and Schonell were survivors at the end of the first year, and those of Evans were that, compared with full-term children, premature babies of matched for age with his cerebral palsy cases. So that high birth weight show a threefold increase in the incidence an was made to overcome the of cerebral spastic paraplegialdiplegia and those of lower in these studies attempt Thus error that would result from referring to birthweights a seventyfold increase. among premature using figures under 4 lb. at birth the chance incidence of prematurity at birth due to the high infants weighing (1,800 g.) of cerebral spastic paraplegia or diplegia is apparently about mortality of premature infants (mainly in the neonatal 1 in 20. period), particularly those of lower birth weight (Alm, If we accept Lilienfeld and Parkhurst's (1951) idea of 1953; Dunham, 1955). " a continuum of wastage," with cerebral palsy in reproductive A further idea of the importance of prematurity as one link in a chain of unfavourable reactions, other cerebral palsy can be obtained from Evans's (1948) data, elements of which are mental defect (Pasamanick and Lilien- by considering the proportion of premature infants feld, 1955b; Lilienfeld and Pasamanick, 1956), epilepsy weighing 4+ lb. (2,040 g.) or less at birth. The relevant (Lilienfeld and Pasamanick, 1954; Pasamanick and Lilien- figures are: 21 such premature infants among 76 cere- feld, 1955a), behaviour disorder (Pasamanick, 1954; Rogers et and foetal and neonatal bral palsy cases and 1 among 50 controls (28% and et al., 1955, Pasamanick al., 1956), al. death, we may observe even more subtle cerebral effects 2% respectively). The figures given by Knobloch et For the lowered in- this found an inci- associated with prematurity. example, (1956) further support point. They telligence quotient found by Douglas (1956) in his group of dence of " overt neurological defect" at 40 weeks of premature children, and confirmed by Dann et al. (1956), 12.3% in 57 premature babies weighing 1,500 g. or less, may represent more limited (or different) results of a harm- of 1.6% in 443 larger prematures, and of 0.6% in 492 ful association between prematurity and brain function. full-term controls matched for race, season of birth, parity, hospital of birth, and socio-economic status. Causal Connexion Cerebral palsy is an aggregate of clinical syndromes What could be the causal connexion in the association with various origins, and so is prematurity. The causes between prematurity and cerebral palsy? As stated, this of prematurity act on the foetus with varied intensity association may manifest itself in different effects, depending and at different developmental stages. Furthermore, the on the different causes of prematurity, the different times in foetus prematurely delivered is exposed to extra risks foetal development when they act, their different intensities, during labour, and the premature newborn baby also and the various stresses to which prematurity itself subjects faces numerous hazards. tIn dystonic cerebral palsy abnormalities of muscle tone pre- and the hypertonus, when present2 is plastic in charac- dominate, the Incidence of Prematurity in Cerebral Palsy ter (Denny-Brown, 1946). In choreo-athetoid cerebral palsy outstanding motor abnormality is the presence of unwanted move- One might expect some types of cerebral palsy to be more ments-dyskinesia of Perlstein (1952) and Balf and Ingram (1955). with than others. Freud spastic paraplegia denotes a condition of lower-limb strongly associated prematurity tCerebral notable functional involve- and Brissaud correlated prematurity particu- paralysis of cerebral origin, without (1897) (1894) ment of the upper limbs. Patients with spastic diplegia have pre- larly with diplegia. The combined figures of Evans (1948) dominantly lower-limb and trunk involvement, and also upper- mean a motor- limb involvement, which, however, is less marked than that of the *This term is used here to persisting qualitative The difference between the two conditions may be disorder due to non-progressive damage of the encephalon occur- lower limbs. ring before the growth of the central nervous system is complete. essentially one of degree. " " BRmIH, 1498 DEC. 20, 1958 PREMATURITY AND CEREBRAL PALSY MEDICAL JOURNAL the developing organism. To deal with one example, tance of obstetric factors in the aetiology of cerebral palsy prematurity may cause cerebral palsy (generally dystonic (toxaemia of pregnancy, ante-partum haemorrhage, breech or choreo-athetoid cerebral palsy) through the mechanism of delivery, forceps delivery, breathing "difficulty," etc.) the neonatal jaundice. Premature babies have a greater ten- control population generally contains a much lower propor- dency to a rise in the serum-bilirubin level, presumably tion of premature children, so that what such comparisons because of an inability of their livers to conjugate the reveal in the cerebral palsy population is the excess of liposoluble bilirubin (indirect-reacting bilirubin) with obstetrical factors responsible for the prematurity though glucuronic acid and transform it into the water-soluble pig- not necessarily for the cerebral palsy. Such comparisons ments I and II (direct bilirubin, bilirubin mono- and di- would be more valid if the control population were matched glucuronide) (see Cole and Lathe, 1953; Billing et al., 1957; for incidence of prematurity. Gray, 1957). For this reason, in a proportion of premature Few studies have separated prematurity into aetiological infants, even in the absence of increased haemolysis due groups and correlated them with the frequency of cerebral to blood-group iso-immunization, the serum bilirubin will palsy, thus trying to link causes of prematurity and cerebral rise to dangerous levels and the liposoluble pigment cross palsy. Douglas's (1956) findings are worth noting in this the blood-brain barrier and produce kernicterus*. context, though they do not refer to cerebral palsy but to If the breakdown of red cells is increased, as, for instance, mental ability of premature children. He examined a pro- when certain vitamin-K analogues are given in excess spectively studied national sample of premature children aged (Laurance, 1955; Crosse et al., 1955; Allison, 1955), the 8 years and found a small group of them who made ". extra production of bilirubin will increase the proportion of outstandingly poor scores in all tests-namely, those whose premature babies who get kernicteric damage. It has prematurity is unexplained either by obstetric abnormality" furthermore been shown by Diamond (1956) that the admin- or by their genetic background. Lilienfeld and Parkhurst istration of sulphafurazole (" gantrisin ") to premature (1951) found a higher incidence of prematurity among those babies may favour kernicteric damage without an excessive cases of cerebral palsy where complications of pregnancy rise in serum bilirubin ; Lathe (1957) has suggested that this and labour had not been present than among those where is due to a lowering of the threshold of the blood-brain they had.
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