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Biomedical subjects

M Stark

Publications and source records attributed to M Stark.

At least 73 records · Page 4Linked to original sources
PubMed1996

Successful outcome of idiopathic nonimmune hydrops fetalis treated by maternal digoxin.

Nonimmune hydrops fetalis (NIHF), occurring in 1 in 2,500-3,000 live births has a reported mortality rate of 50-98%. A similar mortality rate for intrauterine death of fetuses with NIHF probably exists. Many fetal pathological entities have been implicated as causing the condition, but to date, treatment has only been found for cases of fetal tachycardia complicated with hydrops. During a routine ultrasonographic survey of a woman at 32 weeks of gestation, we detected a fetus with severe ascites. There was no apparent etiology, and although no tachycardia was evident, low dosage transplacental digoxin therapy was immediately initiated. The hydropic condition completely resolved within 17 days and at 39 weeks of gestation, a perfectly normal baby was born after a spontaneous and uneventful labor. This is the first report of successful treatment of idiopathic NIHF with maternal digoxin.

Administration, Oral↗
PubMed1995

Crystallization and preliminary X-ray diffraction studies of an a1/alpha 2/DNA ternary complex.

Crystals have been obtained of a ternary complex containing the yeast a1/alpha 2 homeodomain heterodimer bound to a 21-base pair DNA site containing two 5' overhanging bases at each end. The crystals are grown from cobaltic hexamine and form in space group P6(1) or P6(5) with a = b = 133 A, c = 45.4 A. Crystals that are flash-frozen at -179 degrees C diffract to 2.7 A along the c-axis and to 2.4 A in perpendicular directions. The crystals contain one protein-DNA complex in the crystallographic asymmetric unit.

Base Sequence↗
PubMed1995

Neuropsychological features of progressive supranuclear palsy.

Progressive supranuclear palsy (PSP) is the epitome of a subcortical dementia process. Due to its relative rarity, there is only a small literature on the neuropsychological consequences of PSP. The findings to date demonstrate that PSP patients have dramatically slowed information processing and motor execution, rapid forgetting, problems in orienting attentional resources, and difficulty in planning and shifting conceptual sets. The pattern and severity of these deficits are unique to PSP and suggest that the study of PSP patients can provide a special insight into brain-behavior relations.

Brain↗
PubMed1995

Single-cell PCR performed with neurofibroma Schwann cells reveals the presence of both alleles of the neurofibromatosis type 1 (NF1) gene.

It is commonly held that Schwann cells (SC) are the progenitor cells of benign neurofibromas. To test for loss of heterozygosity (LOH) at the neurofibromatosis 1 (NF1) gene locus, three intragenic polymorphic markers were analyzed after polymerase chain reaction amplification, starting from 98 single SC isolated from primary cultures of neurofibromas, of five informative NF1 patients. The patterns obtained did not provide evidence for LOH at the NF1 gene. LOH by nondisjunction, large deletions, or somatic recombination in SC seems not to be the mechanism of generation of neurofibromas.

Alleles↗
PubMed1995

Evaluation of combinations of procedures in cesarean section.

OBJECTIVE: To evaluate a procedure for cesarean section, consisting of a number of surgical techniques adopted from various sources and further developed. METHODS: The principal elements of the cesarean section procedure followed were: the Joel-Cohen method for opening the abdomen, suturing the uterus in one layer, and non-closure of the visceral and parietal peritoneal layers. The postoperative recovery of women who underwent this procedure (JCl--group) was compared with that of women who had undergone a Pfannenstiel incision, in which the uterus is sutured in two layers, and both peritoneal layers sutured (Pf2++ group). RESULTS: The incidence of postoperative febrile morbidity was 7.7% in the JCl--group compared with 19.8% in the Pf2++ group (P < 0.05). Adhesions were found in 6.3% of repeat operations after the JCl--operation compared with 28.8% after the Pf2++ operation (P < 0.05), and there was a non-significant trend toward fewer postoperative analgesics in the JCl--group. CONCLUSION: The cesarean section procedure we have devised is not only safe, but has a lower risk of long- and short-term complications.

Adult↗
PubMed1995

Violence in clinical forensic medicine.

OBJECTIVE: to investigate the levels of physical and verbal violence experienced in the preceding year by doctors working in clinical forensic medicine. DESIGN AND SUBJECTS: anonymised questionnaire sent to all full members of the Association of Police Surgeons. RESULTS: 517 eligible questionnaires were returned; 18.2 per cent of respondents had experienced physical violence, a total of 150 incidents. Of those incidents 'warning signs' of violence had been present in only 25 per cent. A total of 54 working days were lost. Injuries included a fractured wrist and corneal scarring. Of the respondents, 65.5 per cent had experienced verbal violence (of which the most common type was obscenity); 11.8 per cent had received training in dealing with verbal violence and 10.4 per cent in dealing with physical violence; 88 per cent believed that training on how to deal with violence should be part of police surgeon/forensic medicine training. CONCLUSION: verbal and physical violence are common in clinical forensic medicine. Training in dealing with these issues should be introduced.

Education, Medical, Continuing↗
PubMed1994

[Carbohydrate substitutes: comparative study of intestinal absorption of fructose, sorbitol and xylitol].

BACKGROUND: The carbohydrate substitutes fructose, sorbitol and xylitol are gaining more and more importance in the production of dietary food. But they can provoke gastrointestinal side-effects. In a randomized double blind study the rate of malabsorption of these sugars was compared and the concomitant symptoms were recorded. SUBJECTS AND METHODS: 25 healthy controls received 25 g of each sugar within 3 consecutive days. The intestinal absorption was determined by H2-exhalation tests and the clinical symptoms were recorded. RESULTS: The rate of malabsorption was 84% for sorbitol, 36% for fructose and 12% for xylitol (p < 0.01 for sorbitol versus fructose and xylitol). 57% of the participants with pathological H2-test after sorbitol and 56% after fructose reported symptoms, while all of the 3 malabsorbers of xylitol were symptomatic. CONCLUSIONS: There is an advantage to administering xylitol and fructose with regard to the intestinal absorption and concomitant symptoms as compared with sorbitol. H2-exhalation tests appear to be a reliable diagnostic tool to detect carbohydrate malabsorption and should find broader application in patients suffering from non-specific abdominal complaints.

Adult↗
PubMed1994

Automatic fluorescence metaphase finder speeds translocation scoring in FISH painted chromosomes.

A fluorescence metaphase finder was constructed with commercially available hardware and a standard Unix workstation. Its accuracy was measured in terms of the number of false positive and false negative detected metaphases on a variety of different slide preparations. The metaphase finder was used in a translocation scoring experiment in which metaphase preparations of human peripheral blood lymphocytes were hybridized with whole chromosome probes to chromosomes #1, #2, and #4. The automatic finder presented metaphases to the cytogeneticist, centered in the eyepieces at x63. The cytogeneticist's scores of analyzable metaphases and of painted chromosomes involved in rearrangements were recorded. The time for the analysis was recorded and compared to the time to analyze a similar number of cells in a purely visual experiment in which the cytogeneticist scanned for cells and analyzed them, both at x63. The results showed that, neglecting the machine time spent scanning unattended, the amount of time required for the analysis was reduced by a factor of three. Furthermore, in this experiment the metaphase finder found more scorable metaphases than the cytogeneticist found by visual scanning. Machine-assisted scoring had additional, less quantifiable, benefits; notably that digital images of metaphases sometimes assisted the analysis of chromosome rearrangements, that cells could be revisited easily, and that the analysis was much less fatiguing.

Cytogenetics↗
PubMed1994

Behavioral and biological determinants of fecundability.

Our discussion has focused on a set of behavioral and physiological factors which influence fecundability. Some potentially important determinants are notable primarily because of their absence. Foremost among these determinants (as a group) are the male attributes. We have, by and large, ignored the links between male sexual behavior and hormonal profiles and the effects of hormones (or other factors) on sperm function. The fact that we have not reviewed them here does not imply that we believe that they are unimportant. Indeed, the effects of male factors may be particularly important because in some settings men are the predominant, if not the sole, decision-makers regarding reproductive behaviors including initiation of sexual intercourse and use of contraception. Also conspicuous by their absence are the effects of nutrition, consumption of alcohol, exercise, smoking, and behavioral and hormonal correlates of stress, all of which may affect fecundability. We have, though, reviewed a wide range of factors which contribute to fecundability and identified several points of potential interaction between the behavioral and biological determinants. We expect that our future understanding of these processes will be enhanced by empirical work and modeling efforts which also interact to draw upon the insights provided by each.

Behavior↗
PubMed1994

Conservative treatment with successful outcome of a triplet pregnancy after the miscarriage of one fetus in the second trimester.

Due to the increased availability of infertility treatment, multiple pregnancies, with various resulting complications have become more common. A woman in the 19th week of a triplet pregnancy came to the hospital after the miscarriage of one of the fetuses at home. In keeping with our philosophy of minimal intervention in childbirth, we treated the woman conservatively. After confirming that the remaining two fetuses were in good condition, the woman was released home under ambulatory observation, with no antibiotics or tocolytic drugs. No further complications developed, and the woman gave birth in her 31st week to healthy twin girls 82 days later. The successful outcome of this case demonstrates that non-interventional, conservative methods could be a feasible alternative to invasive intervention. We hope that our case will encourage more physicians to try out and report noninterventional methods, so that enough information could be gathered to help make correct management decisions in the future.

Abortion, Spontaneous↗
PubMed1994

Microanatomic analysis of the medial antebrachial nerve as a potential donor nerve in maxillofacial grafting.

PURPOSE: To histologically compare the anterior branch of the medial antebrachial cutaneous nerve (MACN) with the sural nerve using biometric techniques. PATIENTS AND METHODS: Twenty-centimeter segments of the right and left (MACN) and sural nerves from three cadavers were analyzed. The number of fascicles within the nerves were counted and the neural to connective tissue ratio was estimated. RESULTS: Sural nerves consistently showed greater amounts of connective tissue between the fascicles than the MACN. Fascicle diameter varied less throughout the length of the MACN. Fascicle diameter varied less throughout the length of the MACN and it showed fewer and larger fascicles, more closely approximating the anatomy of the inferior alveolar nerve. CONCLUSION: These preliminary data suggest that the MACN, on anatomic grounds, is theoretically more suited for grafting to the alveolar and lingual nerves than the sural nerve.

Forearm↗
PubMed1994

[Fat suppression in contrast-enhanced MRT of the base of the skull and of the head-neck area: its clinical value].

167 patients with abnormalities at the skull base and at the cervical-skull junction were examined by MRT in order to compare a FATSAT technique with T1- and T2-weighted SE sequences before and after intravenous injection of 0.1 mmol Gd-DTPA/kg KG. The diagnostic information from corresponding FATSAT and T1-SE sequences was correlated with the histopathological findings. In 10.7% of patients fat suppression was inadequate and in a further 11.3% of patients chemical shift artifacts limited the diagnostic value. The number of detectable lesions was not increased by the use of FATSAT sequences but visualisation of soft tissue lesions was improved, adding to the diagnostic value under specific conditions. Evaluating by the Friedman and Wilcoxon test showed that the postcontrast FATSAT sequences were markedly superior (p < 0.01) in delineating and contrasting the lesions. The additional use of contrast enhanced FATSAT sequences resulted in improved diagnosis of lesions at the skull base and the facial skeleton.

Adipose Tissue↗
PubMed1994

Recovery of dominant, autosomal flightless mutants of Drosophila melanogaster and identification of a new gene required for normal muscle structure and function.

To identify further mutations affecting muscle function and development in Drosophila melanogaster we recovered 22 autosomal dominant flightless mutations. From these we have isolated eight viable and lethal alleles of the muscle myosin heavy chain gene, and seven viable alleles of the indirect flight muscle (IFM)-specific Act88F actin gene. The Mhc mutations display a variety of phenotypic effects, ranging from reductions in myosin heavy chain content in the indirect flight muscles only, to reductions in the levels of this protein in other muscles. The Act88F mutations range from those which produce no stable actin and have severely abnormal myofibrillar structure, to those which accumulate apparently normal levels of actin in the flight muscles but which still have abnormal myofibrils and fly very poorly. We also recovered two recessive flightless mutants on the third chromosome. The remaining five dominant flightless mutations are all lethal alleles of a gene named lethal(3)Laker. The Laker alleles have been characterized and the gene located in polytene bands 62A10,B1-62B2,4. Laker is a previously unidentified locus which is haplo-insufficient for flight. In addition, adult wild-type heterozygotes and the lethal larval trans-heterozygotes show abnormalities of muscle structure indicating that the Laker gene product is an important component of muscle.

Actins↗