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Biomedical subjects

A H Lipson

Publications and source records attributed to A H Lipson.

At least 19 recordsLinked to original sources
PubMed1997

Severe cervical dysplasia and nasal cartilage calcification following prenatal warfarin exposure.

We present an infant who was exposed to warfarin throughout pregnancy and has warfarin embryopathy. When the child was examined radiologically at 20 months areas of calcification were visible in the septal and alar cartilages of the small external part of the nose. The location of this ectopic calcification is consistent with that seen in an animal model of the warfarin embryopathy. It supports the hypothesis that warfarin interferes with the prenatal growth of the cartilaginous nasal septum by inhibiting the normal formation of a vitamin K-dependent protein that prevents calcification of cartilage. The child also had severe abnormalities of the cervical vertebrae and secondary damage to the spinal cord. Cervical vertebral anomalies are a relatively common finding in the warfarin embryopathy and in the related Binder syndrome.

Adolescent↗
PubMed1997

Anal anomalies: an uncommon feature of velocardiofacial (Shprintzen) syndrome?

We report three cases of velocardiofacial syndrome (VCFS) with anal anomalies who have deletions of the 22q11 region and a further case where the proband has VCFS clinically and her father has an anal anomaly. It is important to consider VCFS in the differential diagnosis of children with anal anomalies and to look for other features of the syndrome, such as asymmetrical crying facies, submucous cleft of the palate, developmental delay, cardiac anomalies, and hypoparathyroidism.

Abnormalities, Multiple↗
PubMed1996

Two cases of maternal antenatal splenic rupture and hypotension associated with Moebius syndrome and cerebral palsy in offspring. Further evidence for a utero placental vascular aetiology for the Moebius syndrome and some cases of cerebral palsy.

UNLABELLED: We wish to report two cases of congenital abnormality after antenatal car accidents resulting in ruptured spleen and severe hypotension in the mothers at 8 and 14 weeks gestation. The first case had the classical Moebius syndrome with 6th and 7th cranial nerve palsy with abnormal brain stem evoked responses, presumably due to hypoxic/ischaemic brain stem damage and the second case had severe retardation and hypertonic cerebral palsy which at post mortem was found to be due to old hypoxic/ischaemic lesions to the caudate nucleus putamen and striatum. CONCLUSION: The cases described provide evidence that severe maternal hypotension during pregnancy can be associated with lesions to the midbrain and brain stem of offspring. The mechanism is probably utero-placental insufficiency, and extrapolation from these two unusual cases would support utero-placental insufficiency as a cause of Moebius syndrome and limb deficiency after chorionic villus sampling.

Accidents, Traffic↗
PubMed1995

Prenatal exposure to phenytoin, facial development, and a possible role for vitamin K.

Ten patients with maxillonasal hypoplasia (Binder "syndrome"), who were prenatally exposed to phenytoin (usually in combination with other anticonvulsants), were identified retrospectively. In addition to their facial anomalies, 6 of the patients were radiographed neonatally and showed punctate calcification, characteristic of chondrodysplasia punctata. Evidence is presented that the facial abnormalities seen in these children are due to anticonvulsant-induced vitamin K deficiency, causing abnormal development of the cartilaginous nasal septum. We propose that early vitamin K supplementation of at-risk pregnancies may prevent the development of maxillonasal hypoplasia, which in some patients is severely disfiguring and causes great emotional distress. Correction of this facial defect requires surgical and dental treatment over a long period of time.

Abnormalities, Drug-Induced↗
PubMed1995

Amelia of the arms and femur/fibula deficiency with splenogonadal fusion in a child born to a consanguineous couple.

A male infant was born with symmetrical tetramelic limb deficiency consisting of bilateral upper limb amelia with severe symmetrical proximal focal femoral deficiency and fibula deficiency associated with left splenogonodal fusion of the discontinuous type, micrognathia, and a prominent capillary haemangioma of the face. The parents are first cousin Lebanese muslims. This observation suggests the possibility of recessive inheritance in some cases of the Amelia, Femur-Fibula dysostosis syndrome with or without splenogonadal fusion.

Abnormalities, Multiple↗
PubMed1994

Decreased bone mineral density in children with phenylketonuria.

Previous studies have suggested that children with phenylketonuria (PKU) have a reduction in bone mineralization compared with control subjects. To investigate this, bone mineral density (BMD) of the total body (TBMD) was measured in 32 prepubertal children with PKU and in 95 age-matched control subjects. Spine bone mineral density (SBMD) was also recorded in a subset, 24 with PKU and 55 control subjects. The effect of dietary intake on bone mass was assessed in 30 of the children with PKU and in 12 control subjects. In the children with PKU, TBMD and SBMD were significantly lower than in the control subjects after adjustment for height and weight (P = 0.03 and P = 0.003, respectively). The children with PKU had a higher intake of calcium (P < 0.0001), phosphorus (P = -0.0002), and magnesium (P < 0.0001), suggesting that their lower BMD occurred despite an adequate diet based on current recommendations. Further study is needed to establish the cause of this deficit in bone mass and the benefit of additional nutritional support to reverse this problem.

Absorptiometry, Photon↗
PubMed1992

Binder's syndrome due to prenatal vitamin K deficiency: a theory of pathogenesis.

There is evidence that vitamin K-deficiency during human pregnancy can be caused by the therapeutic use of warfarin or phenytoin. The pregnancy histories of three cases of Binder's syndrome are reported. One was associated with warfarin exposure, one with phenytoin exposure and one with alcohol abuse. It is proposed that Binder's syndrome can be caused by prenatal exposure to agents that cause vitamin K-deficiency. Sprague-Dawley rats were treated from postnatal day 1 to 12 weeks with daily doses of warfarin (100 mg/kg) and concurrent vitamin K1 (10 mg/kg). This regimen creates a net extra-hepatic vitamin K-deficiency. The treated rats developed with a distinct facial appearance characterized by a markedly reduced snout. Histological examination showed that the normally non-calcified septal cartilage was extensively calcified. It is proposed that normal growth of the septal cartilage is necessary for the development of the profile of the nose and midface and that normal growth will only take place while the septal cartilage is uncalcified.

Adolescent↗
PubMed1991

Fuhrmann syndrome of right-angle bowed femora, absence of fibulae and digital anomalies: two further cases.

We describe 2 patients with bilateral right-angle bowing of femora, absence of fibulae, and reduced, flattened and nail-less toes and symmetrical fingernail deficiency in a consanguineous family of ethnic South Vietnamese Baptists and a non-consanguineous Polish family. These cases are similar to those reported by Fuhrmann et al. (in "Skeletal Dysplasias," New York: Alan R. Liss, Inc., pp 519-524), indicating possible autosomal recessive inheritance of this rare non-lethal limb malformation syndrome.

Abnormalities, Multiple↗
PubMed1991

Successful treatment of dihydropteridine reductase deficiency, with an interesting effect of 5-hydroxytryptophan deficiency on sleep patterns.

We report a child in whom dihydropteridine reductase deficiency was diagnosed prenatally because of an affected sibling and who was treated from birth with apparent good response. This family has been reported before (Firgaira et al., 1980, 1981, 1983; Lipson et al., 1984; Cotton et al., 1986; Dahl et al., 1988). The parents are Lebanese Muslims who are first cousins, and their first and third children, both male, are well. The third child was diagnosed as normal in utero (Firgaira et al., 1983). The second child, the subject of an early report (Lipson et al., 1984), has dihydropteridine reductase deficiency. The dihydropteridine reductase is nonfunctional due to an amino acid insertion (Howells et al., 1990).

5-Hydroxytryptophan↗
PubMed1991

Velocardiofacial (Shprintzen) syndrome: an important syndrome for the dysmorphologist to recognise.

We report the dysmorphological, genetic, and speech therapy aspects of 38 cases of velocardiofacial syndrome presenting to a craniofacial clinic and a specialised children's hospital, to indicate a relatively low incidence of clefting, good response to pharyngoplasty, considerable variability of the syndrome, and two further familial cases. We emphasise the low index of suspicion by paediatricians and paediatric subspecialists which resulted in delayed diagnosis and delayed treatment for the hypernasal speech and velopharyngeal insufficiency for periods of four months to seven years.

Abnormalities, Multiple↗