Search results for " Low-Volume"

showing 5 items of 5 documents

Volatiles in pantellerite magmas: A case study of the Green Tuff Plinian eruption (Island of Pantelleria, Italy)

2013

Abstract The Green Tuff (GT) Plinian eruption, the largest in magnitude at Pantelleria, erupted 3 to 7 km3 DRE of pantellerite magma and a small volume of trachyte. Fifty-nine anorthoclase-hosted melt inclusions from the two basal pumice members were analyzed by FT-IR spectroscopy in order to assess the pre-eruptive H2O content in the pantellerite melt. Microanalytical methods were used to determine major element, Cl, F and S contents. Melt inclusions and glassy groundmasses have a nearly homogeneous pantelleritic composition (peralkaline index = 1.9-2.2) and variable water contents ranging from 1.4 to as high as 4.2 wt %, i.e. much higher than the 1.4 wt % of earlier published studies. The…

LavaSettore GEO/07 - Petrologia E PetrografiaGeochemistryTrachyteMagma chamberStrombolian eruptionGeophysicsEffusive eruptionGeochemistry and PetrologyPumiceMagmaThe Green Tuff (GT) Plinian eruption the largest in magnitude at Pantelleria erupted 3 to 7 km 3 DRE of pantellerite magma and a small volume of trachyte. Fifty-nine anorthoclase-hosted melt inclusions from the two basal pumice members were analyzed by FT-IR spectroscopy in order to assess the pre-eruptive H2Ocontent in the pantellerite melt. Microanalytical methods were used to determine major element Cl F and S contents. Melt inclusions and glassy groundmasses have a nearly homogeneous pantelleritic composition (peralkaline index = 1.9-2.2) and variable water contents ranging from 1.4 to as high as 4.2 wt % i.e. much higher than the 1.4 wt % of earlier published studies. The chlorine content is constant at about 1 wt %. Combined Cl and H2O data were used to estimate a confining pressure of about 50 MPa (depth around 2-3 km) for the GT magma chamber. The chamber was characterized by a compositional zoning with a dominant pantellerite overlying a trachyte magma. Soon after the GT eruption intra-caldera volcanism was dominated by the eruption of voluminous trachyte lavaflows while pantellerite melt production resumed after about 20 ka with numerous low-volume mildly explosive (Strombolian) to effusive eruptions. Comparison with data from the literature reveals that despite the differentexplosivity the post-caldera Strombolian eruptions and the GT Plinian eruption were fed by pantelleritic magmas with similar water contents. Chlorine and CO2contents suggest that the young magma reservoirs feeding the Strombolian to effusive activity were deeper (h≥4.5 km) than the much larger (based on erupted volumes) magma chamber which fed the GT eruptionGeologyMelt inclusionsJournal of Volcanology and Geothermal Research
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Predicting positive surgical margins in partial nephrectomy: A prospective multicentre observational study (the RECORd 2 project)

2020

PURPOSE: to evaluate clinical predictors of positive surgical margins (PSMs) in a large multicenter prospective observational study and to develop a clinic nomogram to predict the likelihood of PSMs after partial nephrectomy (PN). MATERIALS AND METHODS: We prospectively evaluated 4308 patients who had surgical treatment for renal tumors between January 2013 and December 2016 at 26 urological Italian Centers (RECORd 2 project). Two multivariable logistic models were evaluated to predict the likelihood of PSMs. Center caseload was dichotomized using a visual assessment adjusted for several predictors of PSMs. A nomogram predicting PSMs was developed. RESULTS: Overall, 2076 patients treated wi…

MaleNeoplasm ResidualDatabases Factualmulticenter prospective observational studymedicine.medical_treatment030232 urology & nephrologyNephron-sparing surgeryNephrectomyNomogram0302 clinical medicineRenal cell carcinomaRisk Factorsclinical predictorPartial nephrectomyProspective StudiesStage (cooking)Prospective cohort studySurgical margins Nephron-sparing surgery Nomogram Partial nephrectomy Renal cell carcinoma Robot-assisted partial nephrectomySurgical marginsRobot-assisted partial nephrectomyMargins of ExcisionGeneral MedicineMiddle AgedNephrectomyKidney NeoplasmsHospitalsRenal cell carcinomaOncologyElective Surgical Procedures030220 oncology & carcinogenesisArea Under CurveResidualNephron-sparing surgery; Nomogram; Partial nephrectomy; Renal cell carcinoma; Robot-assisted partial nephrectomy; Surgical marginsFemalepositive surgical marginPositive Surgical MarginElective Surgical Proceduremedicine.medical_specialtyHospitals Low-VolumeHigh-Volume03 medical and health sciencesDatabasesSurgical margins; Nephron-sparing surgery; Nomogram; Partial nephrectomy; Renal cell carcinoma; Robot-assisted partial nephrectomyInternal medicineLow-VolumemedicineHumansNeoplasm InvasivenessCarcinoma Renal CellFactualAgedNeoplasm Stagingbusiness.industryCarcinomaRenal CellNomogrammedicine.diseaseNomogramsSettore MED/24Logistic ModelsROC CurveNeoplasmSurgeryObservational studybusinessHospitals High-Volume
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Identification of optimal device combinations for the chimney endovascular aneurysm repair technique within the PERICLES registry

2018

Abstract Objective The ideal stent combination for chimney endovascular aneurysm repair remains undetermined. Therefore, we sought to identify optimal aortic and chimney stent combinations that are associated with the best outcomes by analyzing the worldwide collected experience in the PERformance of chImney technique for the treatment of Complex aortic pathoLogiES (PERICLES) registry. Methods The PERICLES registry was reviewed for patients with pararenal aortic disease electively treated from 2008 to 2014. Eleven different aortic devices were identified with three distinct subgroups: group A (n = 224), nitinol/polyester; group B (n = 105), stainless steel/polyester; and group C (n = 69), n…

MaleRegistrieTime FactorsEndoleakmedicine.medical_treatmentComorbidity030204 cardiovascular system & hematology030230 surgeryEndovascular aneurysm repairSettore MED/22 - Chirurgia VascolareAortic aneurysm0302 clinical medicineRisk FactorsRetrospective StudieOcclusionOdds RatioStentRegistriesMultivariate AnalysiPolytetrafluoroethyleneAged 80 and overEndovascular ProceduresHazard ratioGraft Occlusion VascularEuropeBlood Vessel ProsthesiTreatment OutcomeCardiothoracic surgeryStentsFemaleCardiology and Cardiovascular MedicineSTENT GRAFT; CHIMENY GRAFT; CHIMNEY TECHINQUEHumanUnited Statemedicine.medical_specialtyHospitals Low-VolumeTime FactorPolyestersPolyesterProsthesis DesignDisease-Free Survival03 medical and health sciencesBlood Vessel Prosthesis ImplantationBlood vessel prosthesisAlloysmedicineHumansProportional Hazards ModelsRetrospective StudiesAgedEndovascular ProcedureAortic Aneurysm Thoracicbusiness.industryRisk FactorStentOdds ratiomedicine.diseaseStainless SteelUnited StatesBlood Vessel ProsthesisSurgeryMultivariate AnalysisAlloyProportional Hazards ModelSurgerybusinessHospitals High-VolumeAortic Aneurysm Abdominal
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Surgeon volume and hospital volume in endocrine neck surgery: how many procedures are needed for reaching a safety level and acceptable costs? A syst…

2018

The relationship between quality of care and provider's experience is well known in all fields of surgery. Even in thyroidectomies and parathyroidectomies, the emphasis on positive volume-outcome relationships is believed. It led us to an evaluation of volume activity's impact in terms of quality of care. A systematic narrative review was performed. According to the PRISMA criteria, we selected 87 paper and, after the study selection was performed, 22 studies were finally included in this review. All articles included were unanimous in attributing to activity volume of surgeons as well as centers a substantial importance. Some differences in outcomes between these investigated categories ha…

Reoperationmedicine.medical_specialtyHospitals Low-VolumeCost-Benefit Analysismedicine.medical_treatmentOperative TimeMEDLINEReview030230 surgery03 medical and health sciencesPostoperative Complications0302 clinical medicineHospital volumemedicineHumansHospital CostsQuality of careendocrine surgerySurgeon volumeParathyroidectomySurgeonsbusiness.industryLength of StaySingle surgeonSurgeryEndocrine surgery030220 oncology & carcinogenesisThyroidectomyNarrative reviewbusinessHospital stayHospitals High-VolumeProcedures and Techniques Utilization
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Laparoscopic distal pancreatectomy in Italy: A systematic review and meta-analysis.

2014

BACKGROUND: The use of laparoscopic distal pancreatectomy (LDP) increased in the past twenty years but the real diffusion of this technique is still unknown as well as the type of centers (high or low volume) in which this procedure is more frequently performed. DATA SOURCE: A systematic review was performed to evaluate the frequency of LDP in Italy and to compare indications and results in high volume centers (HVCs) and in low volume centers (LVCs). RESULTS: From 95 potentially relevant citations identified, only 5 studies were included. A total of 125 subjects were analyzed, of whom 95 (76.0%) were from HVCs and 30 (24.0%) from LVCs. The mean number of LDPs performed per year was 6.5. The…

Reoperationmedicine.medical_specialtyHospitals Low-VolumeEndocrinology Diabetes and Metabolismlaparoscopic distal pancreatectomy; pancreatic neoplasms; pancreatic surgery; Gastroenterology; HepatologyPancreatic surgeryPancreatic FistulaPancreatectomymedicineHumanspancreatic surgeryData sourceHepatologybusiness.industryGeneral surgeryLaparoscopic pancreatectomyGastroenterologypancreatic neoplasmLength of StaySurgeryPancreatic NeoplasmsLow volumeSettore MED/18 - Chirurgia GeneraleItalyMeta-analysisSplenectomylaparoscopic distal pancreatectomyLaparoscopyDistal pancreatectomybusinessHospitals High-VolumePancreatology
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