共查询到20条相似文献,搜索用时 0 毫秒
1.
2.
3.
4.
5.
LEOPARD syndrome (LS, OMIM 151100) is a rare multiple congenital anomalies condition, mainly characterized by skin, facial and cardiac anomalies. LEOPARD is an acronym for the major features of this disorder, including multiple Lentigines, ECG conduction abnormalities, Ocular hypertelorism, Pulmonic stenosis, Abnormal genitalia, Retardation of growth, and sensorineural Deafness. About 200 patients have been reported worldwide but the real incidence of LS has not been assessed. Facial dysmorphism includes ocular hypertelorism, palpebral ptosis and low-set ears. Stature is usually below the 25th centile. Cardiac defects, in particular hypertrophic cardiomyopathy mostly involving the left ventricle, and ECG anomalies are common. The lentigines may be congenital, although more frequently manifest by the age of 4–5 years and increase throughout puberty. Additional common features are café-au-lait spots (CLS), chest anomalies, cryptorchidism, delayed puberty, hypotonia, mild developmental delay, sensorineural deafness and learning difficulties. In about 85% of the cases, a heterozygous missense mutation is detected in exons 7, 12 or 13 of the PTPN11 gene. Recently, missense mutations in the RAF1 gene have been found in two out of six PTPN11-negative LS patients. Mutation analysis can be carried out on blood, chorionic villi and amniotic fluid samples. LS is largely overlapping Noonan syndrome and, during childhood, Neurofibromatosis type 1-Noonan syndrome. Diagnostic clues of LS are multiple lentigines and CLS, hypertrophic cardiomyopathy and deafness. Mutation-based differential diagnosis in patients with borderline clinical manifestations is warranted. LS is an autosomal dominant condition, with full penetrance and variable expressivity. If one parent is affected, a 50% recurrence risk is appropriate. LS should be suspected in foetuses with severe cardiac hypertrophy and prenatal DNA test may be performed. Clinical management should address growth and motor development and congenital anomalies, in particular cardiac defects that should be monitored annually. Hypertrophic cardiomyopathy needs careful risk assessment and prophylaxis against sudden death in patients at risk. Hearing should be evaluated annually until adulthood. With the only exception of ventricular hypertrophy, adults with LS do not require special medical care and long-term prognosis is favourable. 相似文献
6.
7.
It has been demonstrated that an autosomal recessive gene, fused pulmonary lobes (fpl), causes fusion of the right pulmonary lobes with several associated malformations and a high incidence of death in homozygous newborns (Aoyama et al. Teratology 1988; 37:159-166). The aim of the present study was to investigate whether the deaths of fpl/fpl newborns were caused by functional abnormalities of the malformed lung or other associated malformations. Day-20 fpl/fpl and fpl/+ fetuses were weighed and examined for gross abnormalities. The lungs of selected fetuses were further examined for histological abnormalities. A wide variety of associated external, visceral, and skeletal anomalies as well as relatively lower body weights than those of phenotypically normal fpl/+ littermates were observed in the fpl/fpl fetuses. The associated anomalies consisted of hematomas and/or subcutaneous hemorrhages in the head, truncus and limbs, eyelid anomalies, CNS defects, lobation anomalies of the liver, hypoplasia of the spleen, partial absence of the skull bones, and dorsi- or ventriflexion of the phalanges of the limbs. Among them, CNS defects and partial absence of the skull bones were considered to be possible causes of newborn deaths. However, the incidence of these malformations was approximately 10% and was lower than the neonatal mortality, which had been estimated to be approximately 50% in the previous study (Aoyama et al. Teratology 1988; 37:159-166). The lungs of fpl/fpl fetuses consistently had hypoplasia of the intermediate lobe and fusion of the right pulmonary lobes. No histological changes suggesting postnatal respiratory insufficiency were found in the lungs of day-20 fpl/fpl fetuses, and the cause of newborn death remains unclear. 相似文献
8.
Liu R Hotta Y Graveline AR Evgenov OV Buys ES Bloch KD Ichinose F Zapol WM 《American journal of physiology. Lung cellular and molecular physiology》2007,293(5):L1300-L1305
Hypoxic pulmonary vasoconstriction (HPV) preserves systemic arterial oxygenation during lung injury by diverting blood flow away from poorly ventilated lung regions. Ventilator-induced lung injury (VILI) is characterized by pulmonary inflammation, lung edema, and impaired HPV leading to systemic hypoxemia. Studying mice congenitally deficient in inducible nitric oxide synthase (NOS2) and wild-type mice treated with a selective NOS2 inhibitor, L-N(6)-(1-iminoethyl)lysine (L-NIL), we investigated the contribution of NOS2 to the impairment of HPV in anesthetized mice subjected to 6 h of either high tidal volume (HV(T)) or low tidal volume (LV(T)) ventilation. HPV was estimated by measuring the changes of left lung pulmonary vascular resistance (LPVR) in response to left mainstem bronchus occlusion (LMBO). LMBO increased the LPVR similarly in wild-type, NOS2(-/-), and wild-type mice treated with L-NIL 30 min before commencing 6 h of LV(T) ventilation (96% +/- 30%, 103% +/- 33%, and 80% +/- 16%, respectively, means +/- SD). HPV was impaired in wild-type mice subjected to 6 h of HV(T) ventilation (23% +/- 16%). In contrast, HPV was preserved after 6 h of HV(T) ventilation in NOS2(-/-) and wild-type mice treated with L-NIL either 30 min before or 6 h after commencing HV(T) ventilation (66% +/- 22%, 82% +/- 29%, and 85% +/- 16%, respectively). After 6 h of HV(T) ventilation and LMBO, systemic arterial oxygen tension was higher in NOS2(-/-) than in wild-type mice (192 +/- 11 vs. 171 +/- 17 mmHg; P < 0.05). We conclude that either congenital NOS2 deficiency or selective inhibition of NOS2 protects mice from the impairment of HPV occurring after 6 h of HV(T) ventilation. 相似文献
9.
Among 74 patients with congenital adrenal hyperplasia observed at Childrens Hospital, Los Angeles, in a 25-year period, 36 had the simple virilizing type and 38 the salt-losing type. During the same time, seven children with virilizing adrenal tumors were observed at the hospital.While virilization and dehydration were the most common presenting symptoms, some of the children first came to medical attention because of other symptoms, and 11 of them died before adrenal hyperplasia had been diagnosed. Twenty-eight additional congenital cardiovascular, genitourinary, and gastrointestinal anomalies were found in 16 of these 74 children.With proper management, the patients tolerated such stresses as surgical operation and infections without difficulty. 相似文献
10.
11.
12.
13.
14.
15.
PETER J 《Polski tygodnik lekarski (Warsaw, Poland : 1960)》1951,6(41):1341-1345
16.
WROBLEWSKI O 《Polski tygodnik lekarski (Warsaw, Poland : 1960)》1952,7(39):1223-1224
17.
18.
19.
20.