Congenital asplenia is a rare life-threatening condition, often presenting with pneumococcal sepsis. It may arise as part of situs abnormalities or result from an unrelated specific defect of spleen development. The mode of inheritance is usually autosomal dominant, though sporadic cases are also reported. In affected individuals, the use of appropriate antibiotic prophylaxis and immunisations could save lives. In our report, we describe a family of three siblings with isolated congenital asplenia and unaffected parents, suggestive of recessive inheritance. The diagnosis in the proband was made post mortem following overwhelming pneumococcal sepsis. We also review the literature and compare the eight families previously reported with congenital isolated asplenia.
"In the majority of cases, major cardiac malformation reveals this condition in the infant and is the reason for the high mortality rate of 60% before reaching 1 year of age . Only 5 to 10% of patients with this syndrome reach adulthood . We picked out polysplenia of accessory spleens, which are always associated in the normal situation with a main spleen. "
[Show abstract][Hide abstract] ABSTRACT: To better describe the natural history, mode of inheritance, and the epidemiological and clinical features of isolated congenital asplenia, a rare and poorly understood primary immunodeficiency.
A French national retrospective survey was conducted in hospital pediatric departments. A definitive diagnosis of ICA was based on the presence of Howell-Jolly bodies, a lack of detectable spleen, and no detectable cardiovascular malformation.
The study included 20 patients (12 males and 8 females) from 10 kindreds neither related to each other nor consanguineous. The diagnosis of ICA was certain in 13 cases (65%) and probable in 7 cases (35%). Ten index cases led to diagnosis of 10 additional cases in relatives. Five cases were sporadic and 15 were familial, suggesting autosomal dominant inheritance. Median age was 12 months at first infection (range, 2-516 months), 11 months at diagnosis of asplenia (range, 0-510 months), and 9.9 years at last follow-up (range, 0.7-52 years). Fifteen patients sustained 18 episodes of invasive bacterial infection, caused mainly by Streptococcus pneumoniae (61%). Outcomes were poor, with 9 patients (45%) dying from fulminant infection.
ICA is more common than was previously thought, with an autosomal dominant inheritance in at least some kindreds. Relatives of cases of ICA should be evaluated for ICA, as should children and young adults with invasive infection.
The Journal of pediatrics 01/2011; 158(1):142-8, 148.e1. DOI:10.1016/j.jpeds.2010.07.027 · 3.79 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: Human judgment is frequently impaired by distracters extending across our field of view. How we extract relevant information from a spatially restricted region in a complex scene in spite of this impairment is an important issue in vision. Recently, it has been shown that this impairment can be reduced by increasing the number of surrounding distracters without changing the density, thus increasing the total area covered by the distracters. Little, however, is known regarding the underlying mechanism(s). Here, we tested the hypothesis that visual impairment by distracters is due to integration of irrelevant information across space, and that further addition of distracters produces contraction of the spatial integration field. Human subjects were instructed to judge the direction of motion within a center disk and to ignore motion noise in the surrounding annulus in a random dot kinematogram. We observed a non-monotonic effect of the size of the annulus, in which the subjects' discrimination thresholds at first increased, and then decreased as the size of the annulus became larger. We further investigated how weak coherent motion in the surrounding annulus interferes with the subjects' performance. Importantly, we found that the amount of interference decreases with the addition of surrounding motion noise, consistent with the hypothesis that the addition of distracters produces contraction of the range of spatial integration. Our results suggest that integration within a visual receptive field causes impairment by distracters across our visual field, and that contraction of the range of integration can counteract this impairment.
Vision research 07/2011; 51(17):1979-85. DOI:10.1016/j.visres.2011.07.011 · 1.82 Impact Factor
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