RESUMEN

The follow-up after intestinal transplantation (ITX) is complex and limited to specialized centers. ITX recipients often travel all over the country to be seen in the outpatient clinic of specialized centers which is costly and time-consuming. Videoconferences through Skype have been implemented to eliminate travel time, costs, and to improve patient compliance without jeopardizing safety. Eighteen of 19 patients followed up after ITX or modified multivisceral transplantation (MMVTX) in conventional outpatient clinics in Oxford agreed to attend additional Skype clinics. All patients who were followed up through Skype clinics after ITX/MMVTX received a questionnaire to measure their satisfaction with methods and technical aspects of videoconferencing as well as time/mode of traveling, travel expenses/costs, waiting time in outpatient clinic and patients' satisfaction. Mean travel distance to Oxford was 236 ± 168 miles, mean travel time was 277 ± 175 min, and mean travel cost was 200 ± 56 Great Britain Pounds. A total of 56% had to take time off work and/or find child/family care for the time spent in travel. These patients reported a satisfaction score of 4.38 ± 0.77 of 5 points as opposed to 2.88 ± 0.90 for attending the conventional outpatient clinic. Skype clinics have been proven successful and feasible in highly specialized fields like ITX in eligible patients.

Asunto(s)

RESUMEN

The objective of this study is to valuate two biomarkers that may guide nutritional assessment during follow up after intestinal transplantation. We performed a retrospective study on prospectively collected data of insulin-like growth factor-1 (IGF-1) and effluent calprotectin in patients undergoing intestinal transplantation. Optimal nutritional status (ONS) was defined by using the Malnutrition Universal Screening Tool (MUST). IGF-1 and calprotectin were correlated with ONS by Pearson correlation. Eighteen cadaveric intestinal transplants were performed over 1,650 days (median follow up 425 days, range 29-1,650 days). Mean IGF-1 and calprotectin were significantly associated with independent nutrition. Seven patients became malnourished on one or more occasions. During malnutrition the mean IGF-1 was 22 ± 14 ng/ml and calprotectin 1,597 ± 1,055 mcg/g. Mean weight during episodes of malnutrition changed from 64.77 ± 8.76 kg to 59.05 ± 8.5 kg (-8.9 ± 1.25%). Both IGF-1 and calprotectin negatively correlated with ONS (Pearson's r, -0.612, p = 0.014). Patients broadly aligned with three groups: nutritionally replete (normal IGF-1 and normal calprotectin), nutritionally equivocal (normal or low normal IGF-1 and high calprotectin), and malnourished (low IGF-1 and high calprotectin). Patients with low IGF-1 and high calprotectin may have a benign clinical presentation. However it is in their interests to have parenteral nutrition restarted pending further investigation.

RESUMEN

INTRODUCTION: In the management of dysphagic stroke patients, percutaneous endoscopic gastrostomies (PEGs) are frequently sited early due to the failure of nasogastric tube (NGT) feeding, with NGTs becoming displaced in over 58% of cases. PEG insertion is a procedure with significant mortality and morbidity. We adapted a novel technique of securing NGTs (a nasal loop) which is non-invasive, allows successful NG feeding and may avoid the need for PEG placement. AIMS: To show that nasal loops result in improved delivery of enteral nutrition. To compare the outcome and complication rate of nasal loop fed patients with those undergoing PEG feeding. METHODS: A 6 month prospective audit of dysphagic stroke patients who were referred for PEG. All patients who were referred with failed NG feeding within 28 days of presentation were offered a nasal loop. Patients who were 28 days post-stroke had a PEG placed if appropriate. The daily feed intake was monitored before and after nasal loop placement. Complication rates and patient outcomes were documented at 2 week and 3 month follow-up. RESULTS: Nasal loop group: 14 patients had a nasal loop for a median of 15 days. The median daily feed provided was 0% before nasal loop and 100% after. Four patients went on to recover normal swallowing, 4 patients died and 6 later proceeded to PEG. PEG group: Seven patients proceeded direct to PEG, 1 died and 6 were alive and PEG fed at 3 months. There were 6 complications from PEG insertion. No patients recovered normal swallowing. CONCLUSIONS: Nasal loops are safe, well tolerated, and effective at delivering full enteral nutrition. Nasal loops allow time for patients who may recover normal swallowing to do so, and thus avoid a PEG. Nasal loops avoid unnecessary PEG insertion in those with a poor prognosis who will not ultimately survive their initial stroke.

Asunto(s)

RESUMEN

The response of male moths from two pheromone races of the European corn borer, Ostrinia nubilalis, was measured in a flight tunnel assay to different ratios of structurally different compounds that comprise the sex pheromone of the Asian corn borer, Ostrinia furnacalis. For both O. nubilalis races, between 1 and 5% of the males completed upwind flights to two different blends of the O. furnacalis pheromone components (the 2:1 Z/E12-14:OAc female-produced blend, and a 97:3 Z/E mix), confirming that rare males exist in the O. nubilalis populations that can detect and respond to mixtures of the O. furnacalis pheromone components. Rare males that responded to the O. furnacalis blends also responded to their own O. nubilalis blends (97:3 or 1:99 Z/E11-14:OAc), indicating that rare O. nubilalis males are not preferentially sensitive to mixtures of the O. furnacalis compounds, but rather that they have a broad range of response specificity, which includes recognition of a wide range of conspecific female-produced ratios, and also recognition of heterospecific mixtures. The results support the hypothesis that saltational shifts in pheromone blend composition (Roelofs et al., 2002) can lead to the evolution of a new species-specific communication system, in part because the broad response specificity of some males includes the ability to respond in an agonistic manner to novel mixtures of compounds.

Asunto(s)

RESUMEN

Moth species have evolved integral membrane desaturases that exhibit a wide diversity in substrate specificity, as well as in regiospecificity and stereospecificity of the unsaturated products. We report here the cloning and expression of a single desaturase from the sex pheromone gland of the light brown apple moth, Epiphyas postvittana, that makes E11 isomers of monounsaturated (E11-16 and E11-14) fatty acids and a diunsaturated (E9,E11-14) fatty acid. In the pheromone gland, the monoene precursor is made available by beta oxidation of E11-16 acid with a subsequent two-carbon loss to E9-14 acid. A functional assay using a baculovirus expression system required addition of myristic acid and E9-14 acid precursors to demonstrate the unusual regiospecificity and stereospecificity of this desaturase. The amino acid sequence of this desaturase has approximately 61% identity to that of Z11-desaturases from two other insect species, and only approximately 48% identity to the metabolic Z9-desaturases in those species. A pheromone-gland Z9-desaturase gene also was found with the light brown apple moth that differed in its deduced amino acid sequence (66% identity) with the metabolic Z9-desaturase from fat body in this species.

Asunto(s)

RESUMEN

A (triangle up) 11-desaturase gene was cloned from the sex pheromone gland of the obliquebanded leafroller moth, Choristoneura rosaceana. The desaturase cDNA sequence spans 1300 nucleotides with an open reading frame encoding a 335 amino-acid protein, which has 81% identity to a Z/E11-desaturase of the redbanded leafroller moth, Argyrotaenia velutinana. A functional assay with a pYES2 yeast expression system demonstrated that the (triangle up) 11-desaturase exhibits unusual substrate and stereospecificities in producing a Z/E11 mixture (7:1) of only C14 acids. A metabolic Z9-desaturase also was cloned from fat body of this species, and proved to be in the class that produces more Z9-16:Acid than Z9-18:Acid.

Asunto(s)

RESUMEN

The redbanded leafroller moth, Argyrotaenia velutinana (Lepidoptera: Tortricidae) uses a 92:8 mixture of (Z)-11- and (E)-11-tetradecenyl acetate in its pheromone blend. These are produced in the abdominal pheromone gland from the corresponding acids, which are biosynthesized in the gland in a 3:2 Z/E ratio by desaturation of myristoyl CoA. The delta 11 desaturase involved in this reaction exhibits unusual substrate and stereospecificities in specifically producing Z11 and E11 isomers of tetradecenoic acid, and exhibiting no activity with C16 and C18 precursor acids. This report describes the cloning and expression of the redbanded leafroller moth delta 11 desaturase, and compares its amino-acid sequence to those of other known insect Z9, Z10, Z11, and E11 desaturases. The metabolic Z9 desaturase from fat body tissue also was cloned and expressed, and found mainly to produce Z9-16:Acid and Z9-18:Acid. The open reading frame of the delta 11 desaturase encodes a protein with 329 amino acids, whereas the open reading frame of the Z9 desaturase encodes a protein with 351 amino acids. Addition of this new delta 11 desaturase with its different substrate and regiospecificites to the databank of characterized integral-membrane desaturases will be key in efforts to determine amino-acid mutations responsible for the wide array of unsaturated fatty-acid products.

Asunto(s)