Aim
Transanal endoscopic microsurgery (TEM) is a technically challenging strategy that allows expanded indications for local excision of rectal lesions. Transluminal suturing is difficult, so open ...management of the resultant defect is appealing. Expert opinion suggests there is more pain when the defect is left open. The aim of this study was to determine if closure of the defect created during full thickness excision of rectal lesions with TEM leads to less postoperative pain compared to leaving the defect open.
Method
At the time of surgery, patients undergoing a full thickness TEM were randomized to sutured (TEM‐S) or open (TEM‐O) management of the rectal defect. At five Canadian academic colorectal surgery centres, experienced TEM surgeons enrolled patients ≥ 18 years treated by full thickness TEM. The primary outcome was postoperative pain measured by the visual analogue scale. Secondary outcomes included postoperative pain medication use and 30‐day postoperative complications, including bleeding, infection and hospital readmission.
Results
Between March 2012 and October 2013, 50 patients were enrolled and randomized to sutured (TEM‐S, n = 28) or open (TEM‐O, n = 22) management of the rectal defect. There was no difference between the two study groups in postoperative pain on postoperative day 1 (2.8 vs 2.6, P = 0.76), day 3 (2.8 vs 2.1, P = 0.23) and day 7 (2.8 vs 1.7, P = 0.10).
Conclusion
In this multicentre randomized controlled trial, there was no difference in postoperative pain between sutured or open defect management in patients having a full thickness excision with TEM.
In March 2017, a captive male juvenile (ca. 6 months old) olive baboon (Papio anubis) was brought to a primate rescue center in Benin with multiple subcutaneous swellings of unknown aetiology. At the ...general inspection of the body, around 15 partially mobile masses of variable sizes were found in different locations across the body. Following two surgical procedures, several cyst-like structures were removed and placed either in 10% formalin or in absolute ethanol. The cysts had a typical coenurus-like morphology. Genomic DNA was extracted from one cyst using a commercially available kit. The molecular characterization was performed by PCR amplification and sequencing of a region of the nuclear ITS-2 rDNA and a fragment of the mitochondrial 12S rDNA gene, revealing its identity as T. serialis, with 88%–98% similarity to T. serialis isolates from USA, Japan and Germany This study reports a new host for the larval form of T. serialis and confirms the role of primates as intermediate host, highlighting also the risk for human infection. Further genetic studies from multiple geographic isolates are needed to clarify the taxonomic status of this group.
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•The present study reports a the olive baboon as new host for the larval form of Taenia serialis.•This is the first report of T. serialis in Benin.•The relevance and risk for the health and welfare of primates in rescues centers is discussed.
Ruptured middle colic artery aneurysm is extremely uncommon. Diagnosis can be challenging, as symptomatology can be attributed to more common abdominal pathologies. Due to the rarity of this ...condition, only case reports are available to inform management.
We present the case of a 72-year-old woman with a ruptured middle colic artery aneurysm presenting with signs and symptoms more suggestive of acute calculous cholecystitis. Her co-existing bleed was confirmed on CT angiogram. Coil embolization was initially attempted unsuccessfully. She underwent laparotomy, a middle colic artery ligation, and extended right hemicolectomy with intra-aortic balloon placement for emergency proximal vascular control. Post-operatively, she had a re-bleed that was successfully managed with covered stent placement in the proximal superior mesenteric artery after an unsuccessful re-attempt at coil embolization. Her apparent associated cholecystitis was managed with antibiotics and resolved uneventfully.
A middle colic artery aneurysm can be challenging to diagnose and treat. Management options include endovascular techniques, open surgery, or a combination approach. Intra-aortic balloon placement for emergency vascular control is a novel approach that could avoid hemorrhage when intra-abdominal vascular access is challenging.
The majority of modern epilepsy research has focused on possible abnormalities in synaptic and intrinsic neuronal properties—as likely epileptogenic mechanisms as well as the targets for developing ...novel antiepileptic treatments. However, many other processes in the central nervous system contribute to neuronal excitability and synchronization. Regulation of ionic balance is one such set of critical processes, involving a complex array of molecules for moving ions into and out of brain cells—both neurons and glia. Alterations in extracellular-to-intracellular ion gradients can have both direct and indirect effects on neuronal discharge. We have found, for example, that when hippocampal slices are exposed to hypo-osmotic bathing medium, the cells not only swell, but there is also a significant increase in the amplitude of a delayed rectifier potassium current in inhibitory interneurons—an effect that may contribute to the increase in tissue excitability associated with hypo-osmolar treatments. In contrast, antagonists of the chloride co-transporter, furosemide or bumetanide, block epileptiform activity in both in vitro and in vivo preparations. This antiepileptic effect is presumably due to the drugs' ability to block chloride co-transport. Indeed, prolonged tissue exposure to low levels of extracellular chloride have a parallel action. These experiments indicate that manipulation of ionic balance may not only facilitate epileptiform activities, but may also provide insight into new therapeutic strategies to block seizures.
Optical imaging of animal somatosensory, olfactory and visual cortices has revealed maps of functional activity. In non-human primates, high-resolution maps of the visual cortex have been obtained ...using only an intrinsic reflection signal. Although the time course of the signal is slower than membrane potential changes, the maximum optical changes correspond to the maximal neuronal activity. The intrinsic optical signal may represent the flow of ionic currents, oxygen delivery, changes in blood volume, potassium accumulation or glial swelling. Here we use similar techniques to obtain maps from human cortex during stimulation-evoked epileptiform afterdischarges and cognitively evoked functional activity. Optical changes increased in magnitude as the intensity and duration of the afterdischarges increased. In areas surrounding the afterdischarge activity, optical changes were in the opposite direction and possibly represent an inhibitory surround. Large optical changes were found in the sensory cortex during tongue movement and in Broca's and Wernicke's language areas during naming exercises. The adaptation of high-resolution optical imaging for use on human cortex provides a new technique for investigation of the organization of the sensory and motor cortices, language, and other cognitive processes.
(ProQuest: ... denotes formulae and/or non-USASCII text omitted; see image).A combination is presented of all inclusive deep inelastic cross sections previously published by the H1 and ZEUS ...collaborations at HERA for neutral and charged current ... scattering for zero beam polarisation. The data were taken at proton beam energies of 920, 820, 575 and 460 GeV and an electron beam energy of 27.5 GeV. The data correspond to an integrated luminosity of about 1 fb... and span six orders of magnitude in negative four-momentum-transfer squared, ..., and Bjorken x. The correlations of the systematic uncertainties were evaluated and taken into account for the combination. The combined cross sections were input to QCD analyses at leading order, next-to-leading order and at next-to-next-to-leading order, providing a new set of parton distribution functions, called HERAPDF2.0. In addition to the experimental uncertainties, model and parameterisation uncertainties were assessed for these parton distribution functions. Variants of HERAPDF2.0 with an alternative gluon parameterisation, HERAPDF2.0AG, and using fixed-flavour-number schemes, HERAPDF2.0FF, are presented. The analysis was extended by including HERA data on charm and jet production, resulting in the variant HERAPDF2.0Jets. The inclusion of jet-production cross sections made a simultaneous determination of these parton distributions and the strong coupling constant possible, resulting in ... An extraction of ... and results on electroweak unification and scaling violations are also presented.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
A combination is presented of all inclusive deep inelastic cross sections previously published by the H1 and ZEUS collaborations at HERA for neutral and charged current $e^{\pm}p$ scattering for zero ...beam polarisation. The data were taken at proton beam energies of 920, 820, 575 and 460 GeV and an electron beam energy of 27.5 GeV. The data correspond to an integrated luminosity of about 1 fb$^{-1}$ and span six orders of magnitude in negative four-momentum-transfer squared, $Q^2$, and Bjorken $x$. The correlations of the systematic uncertainties were evaluated and taken into account for the combination. The combined cross sections were input to QCD analyses at leading order, next-to-leading order and at next-to-next-to-leading order, providing a new set of parton distribution functions, called HERAPDF2.0. In addition to the experimental uncertainties, model and parameterisation uncertainties were assessed for these parton distribution functions. Variants of HERAPDF2.0 with an alternative gluon parameterisation, HERAPDF2.0AG, and using fixed-flavour-number schemes, HERAPDF2.0FF, are presented. The analysis was extended by including HERA data on charm and jet production, resulting in the variant HERAPDF2.0Jets. The inclusion of jet-production cross sections made a simultaneous determination of these parton distributions and the strong coupling constant possible, resulting in $\alpha_s(M_Z)=0.1183 \pm 0.0009 {\rm(exp)} \pm 0.0005{\rm (model/parameterisation)} \pm 0.0012{\rm (hadronisation)} ^{+0.0037}_{-0.0030}{\rm (scale)}$. An extraction of $xF_3^{\gamma Z}$ and results on electroweak unification and scaling violations are also presented.
Celotno besedilo
Dostopno za:
DOBA, IZUM, KILJ, NUK, PILJ, PNG, SAZU, SIK, UILJ, UKNU, UL, UM, UPUK
A role for p53-related modulation of neuronal viability has been suggested by the finding that p53 expression is increased in damaged neurons in models of ischemia and epilepsy. These findings were ...recently extended with the demonstration that mice deficient in p53 ("knock-out" mice) exhibit almost complete protection from seizure-induced brain injury, whereas wild-type mice display significant neuronal cell loss in the hippocampus and other brain regions. Because the p53 knock-out mice used in the latter study expressed a global p53 deficiency in all cell types, it was not possible to conclude that protection was conferred by the exclusive absence of p53 in neurons. Therefore, in the present study, we determined whether p53 expression in isolated neurons is directly coupled to a loss of viability associated with excitotoxic challenge. Primary cultures of hippocampal or cortical neurons were derived from animals containing p53 (+/+, +/-) or those deficient in p53 (-/-). p53-Deficient neurons appeared identical to wild-type neurons with respect to morphology, neurofilament expression, and resting levels of intracellular calcium. Neurons containing at least one copy of p53 were severely damaged by exposure to kainic acid or glutamate. Cell damage was assessed by direct cell counting and by nuclear morphology after propidium iodide staining of DNA. In contrast, neurons deficient in p53 (-/-) exhibited little or no damage in response to excitotoxin treatment. Despite their divergent outcomes, p53 (+/+) and p53 (-/-) neurons demonstrated similar sustained elevations in intracellular calcium levels triggered by glutamate exposure. Restoring p53 expression to p53-deficient neurons, using adenovirus-mediated transduction, was sufficient to promote neuronal cell death even in the absence of excitotoxin. These results demonstrate a direct relationship between p53 expression and loss of viability in CNS neurons.
Cortical disorganization represents one of the major clinical findings in many children with medically intractable epilepsy. To study the relationship between seizure propensity and abnormal cortical ...structure, we have begun to characterize an animal model exhibiting aberrant neuronal clusters (heterotopia) and disruption of cortical lamination. In this model, exposing rats in utero to the DNA methylating agent methylazoxymethanol acetate (MAM; embryonic day 15) disrupts the sequence of normal brain development. In MAM-exposed rats, cells in hippocampal heterotopia exhibit neuronal morphology and do not stain with immunohistochemical markers for glia. In hippocampal slices from MAM-exposed animals, extracellular field recordings within heterotopia suggest that these dysplastic cell clusters make synaptic connections locally (i.e. within the CA1 hippocampal subregion) and also make aberrant synaptic contact with neocortical cells. Slice perfusion with bicuculline or 4-aminopyridine leads to epileptiform activity in dysplastic cell clusters that can occur independent of input from CA3. Taken together, our findings suggest that neurons within regions of abnormal hippocampal organization are capable of independent epileptiform activity generation, and can project abnormal discharge to a broad area of neocortex, as well as hippocampus.
Background: Repeat preoperative endoscopy is common for patients with colorectal neoplasms. This can result in treatment delays and risks of colonoscopy-related complications. Repeat preoperative ...endoscopy has been attributed to poor communication between endoscopists and surgeons. In January 2019, mandatory electronic synoptic reporting for endoscopy was implemented to include elements consistent with quality indicators proposed in national guidelines. The aim of the present study is to assess whether the repeat preoperative endoscopy rate for colorectal lesions changed following synoptic report implementation. Methods: A retrospective review was performed of all patients who underwent elective surgical resection for colorectal neoplasms from January 2007 to June 2020 at a tertiary hospital in Canada. Patients who had an index endoscopy documented via synoptic report were compared with those reported via narrative report. Primary outcomes were rates of repeat preoperative endoscopy and inclusion of colonoscopy quality indicators (e.g., photo-documentation, tattoo placement and bowel preparation score). A total of 1429 patients who underwent elective colorectal resection for colorectal cancers or polyps between January 2007 and June 2020 were included. Of these, 115 had index endoscopies recorded via synoptic report and 1314 by narrative report. The repeat preoperative endoscopy rate after endoscopies documented by narrative report was 29.1% (95% confidence interval CI 26.6%-31.6%) and 25.2% (95% CI 17.6%-34.2%) for synoptic report. Patients whose index endoscopies where performed by a practitioner other than their operating surgeon had a re-endoscopy rate of 36.0% (95% CI 32.8%-39.3%) after narrative report and 38.8% (95% CI 27.1%-51.5%) for synoptic report. Rates of tattoo placement, photo-documentation and reporting of bowel preparation quality were all significantly increased with synoptic reports (p ≤ 0.003). Conclusion: Endoscopy synoptic reports based on current guidelines were not associated with a decrease in rates of repeat preoperative endoscopy at a high-volume colorectal cancer centre. Future study should examine synoptic report contents for this purpose and make necessary modifications.
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