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Biomedical subjects

E Bar-On

Publications and source records attributed to E Bar-On.

At least 37 records · Page 2Linked to original sources
PubMed1997

Early innominate osteotomy as a treatment for avascular necrosis complicating developmental hip dysplasia.

The clinical and radiographic outcomes of 25 patients with avascular necrosis (AVN) of the femoral head complicating developmental hip dysplasia (DDH) were analyzed. Seven patients (group A) had an innominate osteotomy 1-3 years after the ischemic insult. Eight patients (group B) had a pelvic osteotomy between 5 and 10 years after the insult, and 10 patients (group C) did not have a pelvic osteotomy. The minimum follow-up period was 10 years from the time of the ischemic insult. The hips in group A patients (early osteotomy) showed significantly better radiographic outcomes as assessed by a modified Severin grading. These patients also had less pain, fewer gait disturbances, and required fewer additional procedures for limb length discrepancy or greater trochanteric overgrowth.

Child, Preschool↗
PubMed1997

Eosinophilic granuloma of the spine.

Twenty patients treated for eosinophilic granuloma of the spine were studied. Only 40% demonstrated the classical radiographic picture of vertebra plana. In 60% a lytic lesion of the vertebral body or the posterior elements was found. Seven patients underwent surgery; the indications were neurological involvement or failure of the biopsy to disclose the diagnosis. At an average follow-up period of 7 years, 17 patients are well and alive with no residual spinal pain, neurological compromise, recurrent disease, or extraskeletal involvement. Vertebral body collapse underwent some regeneration but did not regain full body height. In several patients this resulted in a local deformity. In patients with unifocal spinal eosinophilic granuloma, watchful observation with no treatment other than spinal support is warranted. In patients with neural involvement or multifocal lesions, a more active treatment, including surgery, may be indicated.

Adolescent↗
PubMed1997

External fixation or flexible intramedullary nailing for femoral shaft fractures in children. A prospective, randomised study.

We report the outcome of 19 children aged 5.2 to 13.2 years with 20 fractures of the femoral shaft requiring surgery, who were randomly assigned to have external fixation (EF) or flexible intramedullary nailing (FIN) (10 fractures each). The duration of the operation averaged 56 minutes for the EF group with 1.4 minutes of fluoroscopy, compared with 74 minutes and 2.6 minutes, respectively, for the FIN group. The early postoperative course was similar, but the FIN [corrected] group showed much more callus formation. The time to full weight-bearing, full range of movement and return to school were all shorter in the FIN group. The FIN complications included one transitory foot drop and two cases of bursitis at an insertion site. In the EF group there was one refracture, one rotatory malunion requiring remanipulation and two pin-track infections. At an average follow-up of 14 months two patients in the EF group had mild pain, four had quadriceps wasting, one had leg-length discrepancy of over 1 cm, four had malalignment of over 5 degrees, and one had limited hip rotation. In the FIN group, one patient had mild pain and one had quadriceps wasting; there were no length discrepancies, malalignment or limitation of movement. Parents of the FIN group were more satisfied. We recommend the use of flexible intramedullary nailing for fractures of the femoral shaft which require surgery, and reserve external fixation for open or severely comminuted fractures.

Absenteeism↗
PubMed1995

[Relationship between spermatogenic maturation stages and male hormone levels].

The relationship between stages of the spermatogenic maturation process and male hormone levels was evaluated in 41 azoospermic, infertile men. Patients were categorized into groups according to the most mature spermatogenic cell type present in testicular aspirates: spermatocytes, spermatids or spermatozoa. High FSH and LH plasma levels were found in those with spermatocytes. Their hormone levels differed statistically (p < 0.005) from those in patients with maturation arrest at the spermatid stage, or those with spermatozoa in their testes. No statistically significant differences were found between the 3 groups with regard to plasma levels of testosterone, free testosterone and prolactin. However, there were positive correlations, higher for free testosterone than for testosterone, with stage of spermatogenic maturation.

Follicle Stimulating Hormone↗
PubMed1995

The relationship between plasma levels of gonadotropins, androgens, and prolactin in azoospermic men with their testicular spermatogenic pattern.

OBJECTIVE: To assess the relationship between plasma levels of gonadotropins, androgens, and PRL with testicular spermatogenic pattern. DESIGN: Patient series. SETTING: University affiliated medical center. PATIENTS: One hundred twenty azoospermic infertile men. INTERVENTIONS: Testicular fine needle aspirations and determination of plasma levels of FSH, LH, T, free T, and PRL. MAIN OUTCOME MEASURES: Gonadotropins, androgens, and PRL plasma levels as a diagnostic criterion of testicular spermatogenic patterns. RESULTS: No statistically significant differences were detected in plasma levels of LH, androgens, and PRL among patients with Sertoli cell only, spermatogenic arrest, or full spermatogenesis. Elevated plasma levels of FSH threefold above the upper normal limit preclude, with a probability of 95%, the existence of full testicular spermatogenesis, but are not valid for the diagnosis of either Sertoli cell only syndrome or spermatogenic arrest. CONCLUSIONS: Luteinizing hormone, androgens, and PRL plasma levels are of no diagnostic value in predicting any specific spermatogenic pattern, and plasma FSH levels can not be used for diagnosing Sertoli cell only syndrome.

Androgens↗
PubMed1994

[Epididymal fine needle aspiration replacing vasography].

Epididymal fine needle aspirations (EFNA) were performed on 29 epididymides of 17 infertile, azoospermic men in whom testicular cytology revealed adequate spermatogenesis. Sonograms confirmed the presence of all the excretory male organs. EFNA was performed to diagnose and locate the site of genital tract occlusion. The presence of cuboidal epithelial cells in the aspirate was the sole indication that epididymal content was aspirated. In 10 (34%) of the 29 aspirates there were only cuboidal epithelial cells and no spermatozoa, indicating proximal occlusion in the rete testis, in the canaliculi efferents or in the most proximal segment of the epididymis itself. Occlusion in the distal segments of the epididymis or in the vas deferens was diagnosed in 13 epididymal aspirates (45%) which contained both cuboidal cells and spermatozoa. In 6 epididymides (21%) no conclusion could be reached because of failed aspirations. There are a variety of treatment modalities available for male genital tract obstruction, such as reconstructive surgery or IVF. The success rate of treatment is mainly dependent on the site of obstruction. Since vasography has its own limitations and hazards, diagnostic EFNA should be performed before treatment in men in whom genital obstruction is suspected.

Biopsy, Needle↗
PubMed1993

Testicular fine needle aspiration as a diagnostic method.

We believe testicular FNA is a reliable, simple, and accurate method for the assessment of testicular pathology and can replace the biopsy. Only when insufficient conclusions may be drawn from the cytologic smears obtained is open biopsy indicated.

Adult↗
PubMed1992

Hip flexion contracture in cerebral palsy. The association between clinical and radiologic measurement methods.

Hip flexion contracture was examined in 51 spastic cerebral palsy patients by three clinical methods and two radiologic methods. An extremely low association was found between the clinical and radiologic methods with no particular method, clinical or radiologic, showing a higher association. The method of clinical examination should be chosen by convenience. Radiologic measurements by the methods used did not add useful information.

Adolescent↗
PubMed1988

The grandmultipara: is she still a risk?

Grandmultiparity is reported to increase both maternal and perinatal mortality and morbidity. Unique religious and demographic factors in Jerusalem allowed us to analyze a population wherein parity could be dissociated from socioeconomic status. A total of 7785 mothers was studied, 889 (11.5%) of whom were grandmultiparas. Comparison of grandmultiparous mothers with all others revealed no increase in the incidence of hypertension, diabetes, uterine atonia, antenatal or postnatal hemorrhage, cesarean sections, stillbirth rate, or congenital malformations. The grandmultipara had significantly lower neonatal mortality and low birth weight rates and a significantly higher incidence of multiple births and trisomy 21 (p less than 0.01). These results strongly suggest that grandmultiparity in and of itself in a healthy, economically stable population afforded modern medical care is not a major risk factor and that previous reports primarily reflected social class factors and not parity per se.

Female↗
PubMed1985

Automatic classification of visual evoked responses.

An automatic method performing selective averaging of visual evoked potentials depending on the state of the EEG background activity is described. The method is based on adaptive segmentation of the EEG signal and on fuzzy clustering. A simulation example, extracting two different square pulses from the background activity, is given, as well as an example averaging two types of visual evoked potentials from the background EEG signal.

Adult↗
PubMed1984

Tuboovarian autoamputation and infertility.

Asymptomatic or undiagnosed tuboovarian autoamputation in teenagers may have its impact on fertility later in life. Two cases are presented with infertility following unilateral adnexal autoamputation. The importance of awareness for possible subtorsion or torsion of adnexa in childhood and adolescence and its impact on fertility are discussed.

Adult↗
PubMed1983

Automatic scoring of polygraphic sleep recordings: midazolam in insomniacs.

Midazolam in doses of 0.21-0.46 mg/kg was given to four insomniacs for 27 days, and to a fifth insomniac for an additional 124 days, to assess its short, intermediate, long-term and long-standing efficacy. Automatic analysis of the polygraphic sleep recordings was carried out employing real-time signal processing (based on linear prediction), and an off-line sequential fuzzy clustering. Total sleep length did not vary significantly during medication, whereas other efficacy parameters such as sleep onset latency, wake time after sleep onset and number of nightly awakenings decreased significantly throughout the period of active medication. In one patient, midazolam was still effective after 151 days of administration. The ultrashort action (probably 3-4 h) of midazolam could be demonstrated by the distribution of the efficacy parameters, dividing the night into 2-h periods, by the unchanged total sleep length during medication compared with baseline and by the lack of any subjective clinical symptoms of hangover. The quantitative analysis of the signals showed that, although a decrease in the total amount of slow-wave sleep during long-term medication and withdrawal was detected, the total relative power in the delta band increased during drug administration. This was interpreted as redistribution of the delta activity during active medication. A lengthening of REM sleep was found during active medication probably attributable to intranight rebound. This was not followed by any clinical symptom of clinical REM rebound.(ABSTRACT TRUNCATED AT 250 WORDS)

Adult↗
PubMed1983

Fuzzy clustering of EEG signal and vigilance performance.

An automatic method for classification of EEG data, based upon segmentation of the signal using the autoregressive model and decision making in fuzzy environment, is described. The classification is applied to explore the relations between EEG states during waking, and vigilance performance studied through auditory choice reaction time. The average auditory choice reaction time measured during occurrences of "alpha" segments was significantly shorter than that measured during occurrences of "nonalpha" signal segments. A significant negative correlation was also found between the segments auditory choice reaction time and the segments spectral power in the alpha or beta frequency band.

Adult↗