346 research outputs found

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    L’exercice comme approche alternative dans la gestion des algies vasculaires de la face: Ă©tude de cas

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    Introduction : Plusieurs traitements pharmacologi- ques sont utilisĂ©s pour soulager la douleur et rĂ©duire la durĂ©e et la frĂ©quence des crises d’algie vasculaire de la face (CH), mais ces traitements demeurent partiellement efficaces pour plusieurs patients. L’exercice aĂ©robie est actuellement pro- posĂ© pour rĂ©duire la prĂ©valence et la gravitĂ© des symptĂŽmes associĂ©s Ă  d’autres types de cĂ©phalĂ©es, mais son efficacitĂ© concernant la gestion des CH n’a pas encore Ă©tĂ© documentĂ©e. ReprĂ©sentation du cas : Cet article dĂ©crit le cas d’un homme de 24 ans chez qui on a diagnostiquĂ© des CH Ă©pisodiques (1/jour ; > 1 heure). Treize jours aprĂšs le premier Ă©pisode, des exercices aĂ©robies d’intensitĂ© modĂ©rĂ©e Ă©taient effectuĂ©s (10 Ă  30 minutes) au dĂ©but des crises. L’exercice aĂ©robie a rĂ©duit Ă  la fois la sĂ©vĂ©ritĂ© et la durĂ©e des crises de CH. Conclusion : Cette Ă©tude de cas suggĂšre que la rĂ©alisation d’exercices aĂ©robies d’intensitĂ© modĂ©rĂ©e au dĂ©but d’une crise de CH pourrait ĂȘtre une intervention non pharmacolo- gique complĂ©mentaire intĂ©ressante pour diminuer les symp- tĂŽmes douloureux liĂ©s Ă  cette condition.Abstract : Background: Various pharmacological treatments have been used to relieve pain and reduce the duration and occurrence of cluster headache (CH) attacks, but these treatments remain partially effective for many patients. Aerobic exercises have been proposed to decrease the prevalence and severity of symptoms associated with other types of headaches, but the effectiveness of aerobic exercise for CH management has not yet been investigated. Case presentation: This report describes the case of a 24 year-old male patient diagnosed with episodic CH (1/day; > 1h). Thirteen days after the first episode, moderate-intensity continuous aerobic exercise was performed (10-30 minutes) at the onset of CH attack. Aerobic exercise reduced both severity and duration of CH attacks. Conclusions: This case report suggests that performing moderate-intensity aerobic exercise at the onset of a CH attack may be an interesting non-pharmacologic intervention that can be used to ease pain symptoms

    Efficiency of spinal anesthesia versus general anesthesia for lumbar spinal surgery: a retrospective analysis of 544 patients.

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    BACKGROUND: Previous studies have shown varying results in selected outcomes when directly comparing spinal anesthesia to general in lumbar surgery. Some studies have shown reduced surgical time, postoperative pain, time in the postanesthesia care unit (PACU), incidence of urinary retention, postoperative nausea, and more favorable cost-effectiveness with spinal anesthesia. Despite these results, the current literature has also shown contradictory results in between-group comparisons. MATERIALS AND METHODS: A retrospective analysis was performed by querying the electronic medical record database for surgeries performed by a single surgeon between 2007 and 2011 using procedural codes 63030 for diskectomy and 63047 for laminectomy: 544 lumbar laminectomy and diskectomy surgeries were identified, with 183 undergoing general anesthesia and 361 undergoing spinal anesthesia (SA). Linear and multivariate regression analyses were performed to identify differences in blood loss, operative time, time from entering the operating room (OR) until incision, time from bandage placement to exiting the OR, total anesthesia time, PACU time, and total hospital stay. Secondary outcomes of interest included incidence of postoperative spinal hematoma and death, incidence of paraparesis, plegia, post-dural puncture headache, and paresthesia, among the SA patients. RESULTS: SA was associated with significantly lower operative time, blood loss, total anesthesia time, time from entering the OR until incision, time from bandage placement until exiting the OR, and total duration of hospital stay, but a longer stay in the PACU. The SA group experienced one spinal hematoma, which was evacuated without any long-term neurological deficits, and neither group experienced a death. The SA group had no episodes of paraparesis or plegia, post-dural puncture headaches, or episodes of persistent postoperative paresthesia or weakness. CONCLUSION: SA is effective for use in patients undergoing elective lumbar laminectomy and/or diskectomy spinal surgery, and was shown to be the more expedient anesthetic choice in the perioperative setting

    Novel Ground-State Crystals with Controlled Vacancy Concentrations: From Kagom\'{e} to Honeycomb to Stripes

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    We introduce a one-parameter family, 0≀H≀10 \leq H \leq 1, of pair potential functions with a single relative energy minimum that stabilize a range of vacancy-riddled crystals as ground states. The "quintic potential" is a short-ranged, nonnegative pair potential with a single local minimum of height HH at unit distance and vanishes cubically at a distance of \rt. We have developed this potential to produce ground states with the symmetry of the triangular lattice while favoring the presence of vacancies. After an exhaustive search using various optimization and simulation methods, we believe that we have determined the ground states for all pressures, densities, and 0≀H≀10 \leq H \leq 1. For specific areas below 3\rt/2, the ground states of the "quintic potential" include high-density and low-density triangular lattices, kagom\'{e} and honeycomb crystals, and stripes. We find that these ground states are mechanically stable but are difficult to self-assemble in computer simulations without defects. For specific areas above 3\rt/2, these systems have a ground-state phase diagram that corresponds to hard disks with radius \rt. For the special case of H=0, a broad range of ground states is available. Analysis of this case suggests that among many ground states, a high-density triangular lattice, low-density triangular lattice, and striped phases have the highest entropy for certain densities. The simplicity of this potential makes it an attractive candidate for experimental realization with application to the development of novel colloidal crystals or photonic materials.Comment: 25 pages, 11 figure

    Pseudomonas aeruginosa Enhances Production of a Non-Alginate Exopolysaccharide during Long-Term Colonization of the Cystic Fibrosis Lung

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    The gram-negative opportunistic pathogen Pseudomonas aeruginosa is the primary cause of chronic respiratory infections in individuals with the heritable disease cystic fibrosis (CF). These infections can last for decades, during which time P. aeruginosa has been proposed to acquire beneficial traits via adaptive evolution. Because CF lacks an animal model that can acquire chronic P. aeruginosa infections, identifying genes important for long-term in vivo fitness remains difficult. However, since clonal, chronological samples can be obtained from chronically infected individuals, traits undergoing adaptive evolution can be identified. Recently we identified 24 P. aeruginosa gene expression traits undergoing parallel evolution in vivo in multiple individuals, suggesting they are beneficial to the bacterium. The goal of this study was to determine if these genes impact P. aeruginosa phenotypes important for survival in the CF lung. By using a gain-of-function genetic screen, we found that 4 genes and 2 operons undergoing parallel evolution in vivo promote P. aeruginosa biofilm formation. These genes/operons promote biofilm formation by increasing levels of the non-alginate exopolysaccharide Psl. One of these genes, phaF, enhances Psl production via a post-transcriptional mechanism, while the other 5 genes/operons do not act on either psl transcription or translation. Together, these data demonstrate that P. aeruginosa has evolved at least two pathways to over-produce a non-alginate exopolysaccharide during long-term colonization of the CF lung. More broadly, this approach allowed us to attribute a biological significance to genes with unknown function, demonstrating the power of using evolution as a guide for targeted genetic studies.open6

    The DEAH-box helicase Dhr1 dissociates U3 from the pre-rRNA to promote formation of the central pseudoknot

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    In eukaryotes, the highly conserved U3 small nucleolar RNA (snoRNA) base-pairs to multiple sites in the pre-ribosomal RNA (pre-rRNA) to promote early cleavage and folding events. Binding of the U3 box A region to the pre-rRNA is mutually exclusive with folding of the central pseudoknot (CPK), a universally conserved rRNA structure of the small ribosomal subunit essential for protein synthesis. Here, we report that the DEAH-box helicase Dhr1 (Ecm16) is responsible for displacing U3. An active site mutant of Dhr1 blocked release of U3 from the pre-ribosome, thereby trapping a pre-40S particle. This particle had not yet achieved its mature structure because it contained U3, pre-rRNA, and a number of early-acting ribosome synthesis factors but noticeably lacked ribosomal proteins (r-proteins) that surround the CPK. Dhr1 was cross-linked in vivo to the pre-rRNA and to U3 sequences flanking regions that base-pair to the pre-rRNA including those that form the CPK. Point mutations in the box A region of U3 suppressed a cold-sensitive mutation of Dhr1, strongly indicating that U3 is an in vivo substrate of Dhr1. To support the conclusions derived from in vivo analysis we showed that Dhr1 unwinds U3-18S duplexes in vitro by using a mechanism reminiscent of DEAD box proteins
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