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1.
Pancreatology ; 17(5): 847-857, 2017.
Artigo em Inglês | MEDLINE | ID: mdl-28843714

RESUMO

BACKGROUND: The outcomes of pancreatectomy with superior mesenteric vein (SMV) or portal vein (PV) resection have been mixed. This study investigated the morbidity and mortality profile after SMV-PV resection in comparison with standard pancreatectomy. Furthermore, we assessed whether tumors with histologically proven SMV-PV infiltration differ from other pT3 neoplasms in terms of recurrence pattern and survival. METHODS: All patients with a pT3 head adenocarcinoma resected from 2000 to 2013 were analyzed retrospectively. In the SMV-PV resection group, information on venous wall status was obtained through pathologic reports. Standard statistical methods were used for data analysis. RESULTS: The study population consisted of 651 patients, of whom 81 (12.4%) underwent synchronous SMV-PV resection. Venous resection was not associated with a higher rate of postoperative complications (60.5% versus 50.2%) and mortality (1.2% versus 1.1%) in comparison with standard pancreatectomy. Vascular infiltration was confirmed pathologically in 56/81 patients (69.1%). The median disease-specific survival of the entire population was 27 months (95% CI 24.6-29.3), with a 5-year survival rate of 20.5%. The median recurrence-free survival was 18 months (95% CI 15.0-20.9). On multivariate analysis, ASA score, preoperative pain, Ca 19-9 levels, tumor grade, R-status, lymph-vascular invasion, N-status, and adjuvant therapy resulted to be survival predictors. Similarly, Ca 19.9 levels, R-status, and N-status were predictors of recurrence. SMV-PV infiltration was not a significant prognostic factor. CONCLUSION: Morbidity and mortality rates of pancreatectomy with SMV-PV resection are comparable with standard pancreatectomy. Pancreatic head adenocarcinoma with histologically confirmed SMV-PV infiltration does not segregate prognostically from other pT3 tumors.


Assuntos
Veias Mesentéricas/patologia , Pancreatectomia , Neoplasias Pancreáticas/classificação , Neoplasias Pancreáticas/cirurgia , Idoso , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Recidiva Local de Neoplasia/patologia , Neoplasias Pancreáticas/patologia , Período Perioperatório , Complicações Pós-Operatórias , Prognóstico , Estudos Retrospectivos , Taxa de Sobrevida , Resultado do Tratamento , Neoplasias Pancreáticas
2.
Antioxid Redox Signal ; 21(6): 850-8, 2014 Aug 20.
Artigo em Inglês | MEDLINE | ID: mdl-24597951

RESUMO

Macrophage apoptosis is involved in atherosclerotic plaque development. The aim of this study was to evaluate the interrelationship between macrophage apoptosis and the endoplasmic reticulum (ER) stress in the tissue around the necrotic core (TANC) and in the periphery (P) of the same carotid plaques derived from patients undergoing carotid endarterectomy. Apoptosis was significantly higher in TANC than in P (p<0.001). mRNA and protein expression of the protein kinase-like ER kinase (Perk) and the nuclear erythroid-related factor 2 (Nrf2)-related survival genes was significantly higher in P than in TANC (p<0.01), while CCAAT/enhancer-binding protein homologous protein (Chop) and the apoptosis-related genes were higher in TANC than in P (p<0.01). The TANC extract was characterized by significantly higher concentrations of oxidized derivatives of polyunsaturated fatty acids (PUFAs) than the P extract (p<0.01). When THP-1 cells were incubated with P or TANC extracts there was a dose-dependent increase of Perk and Nrf2 or of Chop and of the apoptosis-related genes, respectively (p<0.01). Our observations lead to the hypothesis that ER stress induced by oxidized derivatives of PUFAs may promote macrophage apoptosis in TANC and favor the expansion of the necrotic core of the plaques, a major feature responsible for its disruption and acute luminal thrombosis.


Assuntos
Apoptose , Doenças das Artérias Carótidas/metabolismo , Estresse do Retículo Endoplasmático , Ácidos Graxos Insaturados/metabolismo , Placa Aterosclerótica/metabolismo , Idoso , Idoso de 80 Anos ou mais , Apoptose/genética , Cálcio/metabolismo , Doenças das Artérias Carótidas/diagnóstico , Doenças das Artérias Carótidas/tratamento farmacológico , Doenças das Artérias Carótidas/genética , Proteínas de Ciclo Celular/genética , Proteínas de Ciclo Celular/metabolismo , Linhagem Celular , Sobrevivência Celular/genética , Feminino , Expressão Gênica , Humanos , Imuno-Histoquímica , Masculino , Fator 2 Relacionado a NF-E2/metabolismo , Oxirredução , Placa Aterosclerótica/genética , Receptores Acoplados a Proteínas G/genética , Receptores Acoplados a Proteínas G/metabolismo , Transdução de Sinais , Fator de Transcrição CHOP/genética , Fator de Transcrição CHOP/metabolismo , eIF-2 Quinase/genética , eIF-2 Quinase/metabolismo
3.
Nephrol Dial Transplant ; 29(1): 179-87, 2014 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-24166470

RESUMO

BACKGROUND: The vascular access guidelines recommend that arteriovenous fistulas (AVFs) with access dysfunction and an access blood flow (Qa) <300-500 mL/min be referred for stenosis imaging and treatment. Significant (>50%) stenosis, however, may be detected in a well-functioning AVF with a Qa > 500 mL/min, too, but whether it is worth correcting or not remains to be seen. METHODS: In October 2006, we began an open randomized controlled trial enrolling patients with an AVF with subclinical stenosis and Qa > 500 mL/min, to see how elective stenosis repair [treatment group (TX)] influenced access failure (thrombosis or impending thrombosis requiring access revision), or loss and the related cost compared with stenosis correction according to the guidelines, i.e. after the onset of access dysfunction or a Qa < 400 mL/min [control group (C)]. An interim analysis was performed in July 2012, by which time the trial had enrolled 58 patients (30 C and 28 TX). RESULTS: TX led to a relative risk of 0.47 [95% confidence interval (CI): 0.17-1.15] for access failure (P = 0.090), 0.37 [95% CI: 0.12-0.97] for thrombosis (P = 0.033) and 0.36 [95% CI: 0.09-0.99] for access loss (P = 0.041). In the setting of our study (in which all surgery was performed as in patient procedure) no significant differences in costs emerged between the two strategies. The mean incremental cost-effectiveness ratio for TX was €282 or €321 to avoid one episode of thrombosis or access loss, respectively. CONCLUSIONS: Our interim analysis showed that elective repair of subclinical stenosis in AVFs with Qa > 500 mL/min cost-effectively reduces the risk of thrombosis and access loss in comparison with the approach of the Kidney Disease Outcomes Quality Initiative (KDOQI) guidelines, raising the question of whether the currently recommended criteria for assessing and treating stenosis should be reconsidered.


Assuntos
Derivação Arteriovenosa Cirúrgica/efeitos adversos , Diálise Renal , Trombose/prevenção & controle , Grau de Desobstrução Vascular , Idoso , Idoso de 80 Anos ou mais , Derivação Arteriovenosa Cirúrgica/economia , Cateteres de Demora , Constrição Patológica/diagnóstico , Término Precoce de Ensaios Clínicos , Feminino , Humanos , Falência Renal Crônica/terapia , Masculino , Pessoa de Meia-Idade , Monitorização Ambulatorial , Diálise Renal/economia , Trombose/diagnóstico
4.
Cardiovasc Res ; 97(1): 125-33, 2013 Jan 01.
Artigo em Inglês | MEDLINE | ID: mdl-22997156

RESUMO

AIMS: Expansion of necrotic core (NC), a major feature responsible for plaque disruption, is likely the consequence of accelerated macrophage apoptosis coupled with defective phagocytic clearance (efferocytosis). The cleavage of the extracellular domain of Mer tyrosine kinase (Mertk) by metallopeptidase domain17 (Adam17) has been shown to produce a soluble Mertk protein (sMer), which can inhibit efferocytosis. Herein, we analysed the expression and localization of Mertk and Adam17 in the tissue around the necrotic core (TANC) and in the periphery (P) of human carotid plaques. Then we studied the mechanisms of NC expansion by evaluating which components of TANC induce Adam17 and the related cleavage of the extracellular domain of Mertk. METHODS AND RESULTS: We studied 97 human carotid plaques. The expression of Mertk and Adam17 was found to be higher in TANC than in P (P < 0.001). By immunohistochemistry, Mertk was higher than Adam17 in the area of TANC near to the lumen (P < 0.01) but much lower in the area close to NC (P < 0.01). The extract of this portion of TANC increased the expression (mRNA) of Adam17 and Mertk (P < 0.01) in macrophage-like THP-1 cells but it also induced the cleavage of the extracellular domain of Mertk, generating sMer in the medium (P < 0.01). This effect of TANC extract was most evoked by its content in F(2)-isoprostanes, hydroxyoctadecadienoic acids, and hydroxytetraenoic acids. CONCLUSION: Some oxidized derivatives of polyunsaturated fatty acids contained in TANC of human carotid plaques are strong inducers of Adam17, which in turn leads to the generation of sMer, which can inhibit efferocytosis.


Assuntos
Artérias Carótidas/enzimologia , Doenças das Artérias Carótidas/enzimologia , Ácidos Graxos Insaturados/metabolismo , Placa Aterosclerótica , Proteínas Proto-Oncogênicas/metabolismo , Receptores Proteína Tirosina Quinases/metabolismo , Proteínas ADAM/genética , Proteínas ADAM/metabolismo , Proteína ADAM17 , Idoso , Apoptose , Artérias Carótidas/patologia , Doenças das Artérias Carótidas/patologia , Linhagem Celular , F2-Isoprostanos/metabolismo , Feminino , Humanos , Ácidos Hidroxieicosatetraenoicos/metabolismo , Imuno-Histoquímica , Peptídeos e Proteínas de Sinalização Intercelular/metabolismo , Ácidos Linoleicos Conjugados/metabolismo , Macrófagos/enzimologia , Macrófagos/patologia , Masculino , Necrose , Oxirredução , Fagocitose , Interferência de RNA , Transfecção , c-Mer Tirosina Quinase
5.
Clin J Am Soc Nephrol ; 6(4): 819-26, 2011 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-21454718

RESUMO

BACKGROUND AND OBJECTIVES: Guidelines recommend systematically screening for stenosis using various methods, but no studies so far have compared all of the options. A prospective blinded study was performed to compare the performance of several bedside tests performed during dialysis in diagnosing angiographically proven >50% fistula stenosis. DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS: In an unselected population of 119 hemodialysis patients with mature fistulas, physical examination (PE) was conducted; dynamic and derived static venous pressure (VAPR), blood pump flow/arterial pressure (Qb/AP) ratio, recirculation (R), and access blood flow (Qa) were measured; and angiography was performed. RESULTS: Angiography identified 59 stenotic fistulas: 43 stenoses were located upstream from the venous needle (inflow stenosis), 12 were located downstream (outflow stenosis), and 4 were located at both sites. The optimal tests for identifying an inflow stenosis were Qa < 650 ml/min and the combination of a positive PE "or" Qa < 650 ml/min (accuracy 80% and 81%, respectively), the latter being preferable because it was more sensitive (85% versus 65%, respectively) for a comparable specificity (79% versus 89%, respectively). The best tests for identifying outflow stenosis were PE and VAPR, with no difference between the two (accuracy 91% and 85%, sensitivity 75% and 81%, specificity 93% and 86%, respectively), the former being preferable because it was more reproducible, easier to perform, and applicable to all fistulas. CONCLUSIONS: This study showed that fistula stenosis can be detected and located during dialysis with a moderate-to-excellent accuracy using PE and Qa measurement as screening procedures.


Assuntos
Derivação Arteriovenosa Cirúrgica/efeitos adversos , Diálise Renal/efeitos adversos , Grau de Desobstrução Vascular , Adulto , Idoso , Constrição Patológica , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Exame Físico , Estudos Prospectivos
6.
Clin J Am Soc Nephrol ; 6(5): 1073-80, 2011 May.
Artigo em Inglês | MEDLINE | ID: mdl-21441125

RESUMO

BACKGROUND AND OBJECTIVES: Given different sites of stenosis and access blood flow rates (Qa), the criteria for diagnosing fistula stenosis might vary according to anastomotic site. To test this, we analyzed the database of a prospective blinded study seeking an optimal bedside screening program for fistula stenosis. DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS: Several methods used during dialysis (physical examination [PE], dynamic and derived static venous pressure [VAPR], dialysis blood pump flow/arterial pressure ratio, and Qa measurement) to diagnose angiographically-proven >50% stenosis were assessed in an unselected population of hemodialysis patients with mature fistulae (43 at the wrist [distal fistulae], 76 at mid-forearm or the elbow [proximal fistulae]). RESULTS: Prevalence of inflow stenosis was uninfluenced by anastomotic site, whereas outflow stenoses were more prevalent in proximal fistulae. The best test for inflow stenosis was Qa <650 ml/min in distal fistulae and a combination of a positive PE and Qa <900 ml/m in proximal fistulae. In proximal fistulae, PE and VAPR >0.5 were both equally highly diagnostic of outflow stenosis. Tailoring choice of test to site of the anastomosis may also contain the screening-associated workload, by reducing the need to perform PE and measure VAPR, compared with a screening approach regardless of the access location. CONCLUSIONS: Our study shows that an effective bedside screening program with ≥85% accuracy for fistula stenosis can be tailored to the site of the anastomosis, Qa being the tool of choice for the wrist, and PE alone or combined with Qa and VAPR measurements for more proximally-located accesses.


Assuntos
Derivação Arteriovenosa Cirúrgica/efeitos adversos , Oclusão de Enxerto Vascular/diagnóstico , Falência Renal Crônica/terapia , Sistemas Automatizados de Assistência Junto ao Leito/normas , Diálise Renal , Idoso , Idoso de 80 Anos ou mais , Derivação Arteriovenosa Cirúrgica/estatística & dados numéricos , Pressão Sanguínea , Feminino , Oclusão de Enxerto Vascular/epidemiologia , Humanos , Falência Renal Crônica/epidemiologia , Masculino , Pessoa de Meia-Idade , Sistemas Automatizados de Assistência Junto ao Leito/estatística & dados numéricos , Prevalência , Estudos Prospectivos , Fluxo Pulsátil , Reprodutibilidade dos Testes
7.
Nephrol Dial Transplant ; 23(11): 3578-84, 2008 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-18511608

RESUMO

BACKGROUND: Access blood flow (Qa) measurement is the recommended method for fistula (AVF) surveillance for stenosis, but whether it may be beneficial and cost-effective is controversial. METHODS: We conducted a 5-year controlled cohort study to evaluate whether adding Qa surveillance to unsystematic clinical monitoring (combined with elective stenosis repair) reduces thrombosis and access loss rates, and costs in mature AVFs. We prospectively collected data in 159 haemodialysis patients with mature AVFs, 97 followed by unsystematic clinical monitoring (Control) and 62 by adding Qa surveillance to monitoring (Flow). Indications for imaging and stenosis repair were clinically evident access dysfunction in both groups and a Qa < 750 ml/min or dropping by >20% in Flow. RESULTS: Adding Qa surveillance prompted an increase in access imaging (HR 2.96, 95% CI 1.79-4.91, P < 0.001), stenosis detection (HR 2.55, 95% CI 1.48-4.42, P = 0.001) and elective repair (HR 2.26, 95% CI 1.16-4.43, P = 0.017), and a reduction in thromboses (HR 0.27, 95% CI 0.09-0.79, P = 0.017), central venous catheter placements (HR 0.14, 95% CI 0.03-0.42, P = 0.010) and access losses (HR 0.35, 95% CI 0.11-1.09, P = 0.071). In the Kaplan-Meier analysis, adding Qa surveillance only extended short-term cumulative patency (P = 0.037 in the Breslow test). Mean access-related costs were 1213 Euro/AVF-year in Control and 743 in Flow (P < 0.001). CONCLUSIONS: Our controlled cohort study shows that adding Qa surveillance to monitoring in mature AVFs is associated with a better detection and elective treatment of stenosis, and lower thrombosis rates and access-related costs, although the cumulative access patency was only extended in the first 3 years after fistula maturation. We are aware of the limitations of our study (non-randomization and the possible centre effect) and that further, better-designed trials are needed to arrive at a definitive answer concerning the role of Qa surveillance for fistulae.


Assuntos
Braço/irrigação sanguínea , Derivação Arteriovenosa Cirúrgica , Cateteres de Demora , Nefropatias/terapia , Monitorização Ambulatorial/métodos , Diálise Renal , Trombose/prevenção & controle , Idoso , Estudos de Coortes , Feminino , Custos de Cuidados de Saúde/estatística & dados numéricos , Humanos , Incidência , Estimativa de Kaplan-Meier , Estudos Longitudinais , Masculino , Pessoa de Meia-Idade , Monitorização Ambulatorial/economia , Avaliação de Resultados em Cuidados de Saúde , Estudos Prospectivos , Fluxo Sanguíneo Regional/fisiologia , Estudos Retrospectivos , Trombose/economia
8.
Nephrol Dial Transplant ; 22(9): 2605-12, 2007 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-17517799

RESUMO

BACKGROUND: Surgery is an established treatment for stenosed and thrombosed forearm arteriovenous fistulae (AVFs), but the literature on its outcome is limited. We report our experience of the surgical repair of stenosis in patent and thrombosed forearm AVFs and evaluate the outcome of two procedures, proximal neo-anastomosis (NEO) vs replacement of the stenosed segment with a polytetrafluoroethylene graft interposition (GI). METHODS: Sixty-four stenosed forearm AVFs underwent surgery, 32 pre-emptively and 32 post-thrombosis. End points of the study were initial success, restenosis and access loss rates. After treatment, AVFs were surveilled for restenosis by measuring access flow quarterly and performing at least one follow-up angiogram. RESULTS: Initial procedural success was 92%; 100% for patent and 84% for thrombosed AVFs. The restenosis rate was 0.189 events/AVF-year for both patent and thrombosed AVFs, while the access loss rate was 0.016 events/AVF-year in patent and 0.148 in thrombosed AVFs. Stenosis was corrected by NEO in 27 AVFs and by GI in 30. The restenosis and access loss rates were 0.151 vs 0.214 and 0.033 vs 0.019 events/AVF-year for NEO vs GI, respectively. At Cox's hazard analysis, no variable was significantly associated with restenosis, while the timing of intervention was the only significant determinant of access loss, repaired clotted accesses carrying an 8.0-fold relative risk of access loss compared with patent AVFs (P=0.048). CONCLUSION: Our study shows that surgery remains a valid option for the pre-emptive repair of stenosis and to salvage clotted forearm AVFs, offering an excellent initial success rate and low restenosis rate. It confirms that it is better to treat stenosis pre-emptively than post-thrombosis (though the restenosis rate appears to be uninfluenced by the timing of intervention) and suggests that GI compares favourably with conventional NEO.


Assuntos
Fístula Arteriovenosa/cirurgia , Constrição Patológica/cirurgia , Antebraço/cirurgia , Diálise Renal/métodos , Trombose/cirurgia , Fístula Arteriovenosa/fisiopatologia , Constrição Patológica/fisiopatologia , Feminino , Antebraço/fisiopatologia , Humanos , Masculino , Pessoa de Meia-Idade , Reoperação , Trombose/fisiopatologia , Resultado do Tratamento , Grau de Desobstrução Vascular
9.
Clin J Am Soc Nephrol ; 1(3): 448-54, 2006 May.
Artigo em Inglês | MEDLINE | ID: mdl-17699244

RESUMO

Surgery is the traditional treatment for juxta-anastomotic stenoses in forearm arteriovenous fistulas (AVF), but percutaneous transluminal angioplasty (PTA) is a suitable alternative. No prospective comparative trials between the two have been reported to date, however. A retrospective analysis of prospectively, concurrently collected data was performed to compare the outcome and cost of surgery and PTA in the preemptive repair of juxta-anastomotic stenosis in lower forearm AVF. Sixty-four AVF with >50% venous juxta-anastomotic stenosis were considered: 21 were treated surgically (11 proximal neo-anastomosis and 10 polytetrafluoroethylene interposition graft) and 43 by PTA. After treatment, AVF were monitored by quarterly ultrasound dilution access blood flow measurement. End points were restenosis and procedure failure rate (re-intervention by another technique or access loss), and determinants were analyzed using Cox hazard model. Initial procedural success was 100% for surgery and 95% for PTA (P = 0.539). Restenosis rate was 0.168 and 0.519 events/AVF-year for surgery and PTA, respectively (P = 0.009). The type of procedure was the only variable that was significantly associated with restenosis, the adjusted relative risk being 2.77-fold higher (95% confidence interval 1.07 to 7.17; P = 0.036) after PTA than surgery. The procedure failure rate was 0.110 and 0.097 events/AVF-year for surgery and PTA, respectively (P = 0.736). The cost profile also was similar for the two procedures. This prospective comparative study confirms a higher restenosis rate after PTA than surgery, but with strict surveillance for restenosis, the two procedures show similar assisted primary patency and cost, suggesting that they should be considered equally valid, complementary alternatives in the preemptive treatment of juxta-anastomotic stenosis in forearm AVF.


Assuntos
Derivação Arteriovenosa Cirúrgica/efeitos adversos , Constrição Patológica/prevenção & controle , Feminino , Antebraço , Humanos , Masculino , Pessoa de Meia-Idade , Complicações Pós-Operatórias/prevenção & controle , Estudos Prospectivos , Estudos Retrospectivos , Procedimentos Cirúrgicos Vasculares
10.
Ann Ital Chir ; 77(6): 465-8, 2006.
Artigo em Inglês | MEDLINE | ID: mdl-17343228

RESUMO

AIM OF THE STUDY: The purpose of this research project, granted by the Italian University and Scientific Research Ministry (MIUR) and carried on among four Surgical Departments in Padua, Verona, Pisa and Rome-Tor Vergata Universities, is to study the effectiveness of a virtual reality simulator as a tool for surgical residents training and as a method for measuring the surgical skills. MATERIALS AND METHODS: The residents performances on the computer were compared with those obtained by other training groups: medical students with no surgical background, senior surgeons with experience in the laparoscopy field and non medical students with referred ability in videogames. The residents were also sent to a well certified live animal laboratory where they could perform a cholecystectomy in a pig. Their operation was assessed by two independent observers using a new scoring methods for assessing the operative errors. RESULTS: Statistically significant differences among the groups could be seen only after several tasks sessions and in the more surgical specific tasks. The first data analysis shows a fair correlation between the residents rank positions after the training tasks on the simulator and those obtained in the surgical operation. CONCLUSION: Even if the data are not conclusive and the surgical simulators must develop greater levels of fidelity and operational diversity, the potential value of simulation in the educational surgical field appears to be impressive.


Assuntos
Educação de Pós-Graduação em Medicina , Cirurgia Geral/educação , Internato e Residência , Ensino/métodos , Interface Usuário-Computador , Humanos , Laparoscopia/métodos
11.
Obes Surg ; 14(8): 1095-102, 2004 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-15479599

RESUMO

BACKGROUND: Controversial findings about the relationships between obesity and gastro-esophageal reflux have been reported, as well as about the effects of weight loss and bariatric surgery on reflux. The aims of this study were to evaluate esophageal motility and gastro-esophageal acid circadian patterns in obese patients and to test the effects of vertical banded gastroplasty (VBG) on these parameters. METHODS: 14 obese subjects (BMI 36-53 kg/m2), 4 men, 10 women, 27-61 years old, admitted for elective bariatric surgery, underwent clinical evaluation, upper endoscopy, esophageal manometry and gastroesophageal pH monitoring. Evaluations were repeated 6 to 12 months after gastric surgery that consisted of a VBG (7 patients), accompanied in the other 7 patients with an anti-reflux procedure (fundoplication). Manometric and pH-metric findings in the obese patients were compared with a normal-weight control group before and after the two different surgical treatments. RESULTS: Gastro-esophageal reflux was significantly more frequent in obese (57.1%) than in control group (7.1%). Esophageal motility in obese subjects was not different from controls. After VBG alone, we found a reduction in basal lower esophageal sphincter (LES) pressure and an increase of acid reflux. When VBG was accompanied by fundoplication, basal LES pressure increased and acid reflux frequency decreased. CONCLUSIONS: Obesity is associated with gastroesophageal reflux. VBG reduced weight, but not gastro-esophageal acid reflux. Therefore, in our population, this operation cannot be considered as an antireflux procedure.


Assuntos
Refluxo Gastroesofágico/fisiopatologia , Gastroplastia/efeitos adversos , Obesidade Mórbida/cirurgia , Adulto , Ritmo Circadiano , Técnicas de Diagnóstico do Sistema Digestório , Feminino , Refluxo Gastroesofágico/diagnóstico , Refluxo Gastroesofágico/etiologia , Motilidade Gastrointestinal/fisiologia , Humanos , Masculino , Pessoa de Meia-Idade , Obesidade Mórbida/complicações , Obesidade Mórbida/fisiopatologia , Estudos Prospectivos , Resultado do Tratamento
12.
Nephrol Dial Transplant ; 19(9): 2325-33, 2004 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-15280529

RESUMO

BACKGROUND: Stenosis is the main cause of arteriovenous fistula (AVF) failure. It is unclear, however, if surveillance for stenosis enhances AVF function and longevity and if there is an ideal time for intervention. METHODS: In a 5-year randomized, controlled, open trial we compared blood flow surveillance and pre-emptive repair of subclinical stenoses (one or both of angioplasty and open surgery) with standard monitoring and intervention based upon clinical criteria alone to determine if the former prolonged the longevity of mature forearm AVFs. Surveillance with blood pump flow (Qb) monitoring during dialysis sessions and quarterly shunt blood flow (Qa) or recirculation measurements identified 79 AVFs with angiographically proven, significant (>50%) stenosis. The AVFs were randomized to either a control group (intervention done in response to a decline in the delivered dialysis dose or thrombosis; n = 36) or to a pre-emptive treatment group (n = 43). To evaluate a possible relationship between outcome and haemodynamic status of the access, AVFs were divided into functional and failing subgroups, according to Qa values higher or lower than 350 ml/min or the absence or presence of recirculation. RESULTS: A Kaplan-Meier analysis showed that pre-emptive treatment reduced failure rate (P = 0.003) and the Cox hazards model identified treatment (P = 0.009) and higher baseline Qa (P = 0.001) as the only variables associated with favourable outcome. Primary patency rates were higher in treatment than in control AVFs in both functional (P = 0.021) and failing subgroups (P = 0.005). They were also higher in functional than in failing AVFs in both control (P<0.001) and treatment groups (P = 0.023). Access survival was significantly higher in pre-emptively treated than in control AVFs (P = 0.050), a higher post-intervention Qa being the only variable associated with improved access longevity (P = 0.044). Secondary patency rates were similar in pre-emptively treated and control AVFs in both functional (P = 0.059) and failing subgroups (P = 0.394). They were also similar in functional and failing AVFs in controls (P = 0.082), but were higher in pre-emptively treated functional AVFs than in pre-emptively treated failing AVFs (P = 0.033) or in the entire control group (P = 0.019). CONCLUSIONS: We provide evidence that active blood flow surveillance and pre-emptive repair of subclinical stenosis reduce the thrombosis rate and prolong the functional life of mature forearm AVFs. We also show that Qa is a crucial indicator of access patency and a Qa >350 ml/min portends a superior outcome with pre-emptive action in AVFs.


Assuntos
Derivação Arteriovenosa Cirúrgica/efeitos adversos , Constrição Patológica/diagnóstico , Constrição Patológica/cirurgia , Trombose/prevenção & controle , Algoritmos , Velocidade do Fluxo Sanguíneo/fisiologia , Constrição Patológica/etiologia , Feminino , Hemodinâmica , Humanos , Masculino , Pessoa de Meia-Idade , Monitorização Fisiológica/métodos , Estudos Prospectivos , Fluxo Sanguíneo Regional/fisiologia , Reoperação , Trombose/etiologia , Fatores de Tempo , Resultado do Tratamento , Procedimentos Cirúrgicos Vasculares/métodos
13.
Am J Kidney Dis ; 42(2): 331-41, 2003 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-12900816

RESUMO

BACKGROUND: Vascular access surveillance by ultrasound dilution blood flow rate (Qa) measurement is widely recommended; however, optimal criteria for detecting stenosis and predicting thrombosis in arteriovenous fistulae (AVFs) are still not clearly defined. METHODS: In a blinded trial, we evaluated the accuracy of single Qa measurement, Qa adjusted for mean arterial pressure (Qa/MAP), and decrease in Qa over time (dQa) in detecting stenosis and predicting thrombosis in an unselected population of 120 hemodialysis subjects with native forearm AVFs (91 AVFs, located at the wrist; 29 AVFs, located at the midforearm). All AVFs underwent fistulography, which identified greater than 50% stenosis in 54 cases. RESULTS: Receiver operating characteristic curve analysis showed that dQa, Qa, and Qa/MAP have a high stenosis discriminative ability with similar areas under the curve (AUCs), ie, 0.961 +/- 0.025, 0.946 +/- 0.021, and 0.912 +/- 0.032, respectively. In the population as a whole, optimal thresholds for stenosis were Qa less than 750 mL/min alone and in combination with dQa greater than 25% (efficiency, 90%); however, the best threshold depended on anastomotic site; it was Qa less than 750 mL/min for an AVF at the wrist and Qa less than 1,000 mL/min for an AVF in the midforearm. Qa was the best predictor of incipient thrombosis (AUC, 0.981 +/- 0.013) with an optimal threshold at less than 300 mL/min (efficiency, 94%). Pooled intra-assay and interassay variation coefficients were 8.2% for MAP, 7.9% for Qa, and 11.2% for Qa/MAP. CONCLUSION: Our study shows that ultrasound dilution Qa measurement is a reproducible and highly accurate tool for detecting stenosis and predicting thrombosis in forearm AVFs. Neither Qa/MAP nor dQa improve the diagnostic performance of Qa alone, although its combination with dQa increases the test's sensitivity for stenosis.


Assuntos
Derivação Arteriovenosa Cirúrgica , Velocidade do Fluxo Sanguíneo , Vasos Sanguíneos/diagnóstico por imagem , Antebraço/irrigação sanguínea , Diálise Renal , Trombose/prevenção & controle , Grau de Desobstrução Vascular , Idoso , Derivação Arteriovenosa Cirúrgica/efeitos adversos , Pressão Sanguínea , Constrição Patológica , Feminino , Fluxômetros , Antebraço/diagnóstico por imagem , Humanos , Técnicas de Diluição do Indicador/instrumentação , Masculino , Pessoa de Meia-Idade , Curva ROC , Reprodutibilidade dos Testes , Método Simples-Cego , Trombose/etiologia , Ultrassonografia/instrumentação , Ultrassonografia/métodos , Punho/irrigação sanguínea , Punho/diagnóstico por imagem
14.
J Am Soc Nephrol ; 14(6): 1623-7, 2003 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-12761264

RESUMO

Balloon angioplasty (PTA) is an established treatment modality for stenosis in dysfunctional arteriovenous fistulae (AVF), although most studies showing efficacy have been retrospective, uncontrolled, and nonrandomized. In addition, it is unknown whether correction of stenosis not associated with significant hemodynamic, functional, and clinical abnormality may improve survival in AVF. This study was a prospective controlled open trial to evaluate whether prophylactic PTA of stenosis not associated with access dysfunction improves survival in native, virgin, radiocephalic forearm AVF. Sixty-two stenotic, functioning AVF, i.e., able to provide adequate dialysis, were enrolled in the study: 30 were allocated to control and 32 to PTA. End points of the study were either AVF thrombosis or surgical revision due to reduction in delivered dialysis dose. Kaplan-Meier analysis showed that PTA improved AVF functional failure-free survival rates (P = 0.012) with a fourfold increase in median survival and a 2.87-fold decrease in risk of failure. Cox proportional hazard model identified PTA as the only variable associated with outcome (P = 0.012). PTA induced an increase in access blood flow rate (Qa) by 323 (236 to 445) ml/min (P < 0.001), suggesting that improved AVF survival is the result of increased Qa. PTA was also associated with a significant decrease in access-related morbidity by approximately halving the risk of hospitalization, central venous catheterization, and thrombectomy (P < 0.05). This study shows that prophylactic PTA of stenosis in functioning forearm AVF improves access survival and decreases access-related morbidity, supporting the usefulness of preventive correction of stenosis before the development of access dysfunction. It also strongly supports surveillance program for early detection of stenosis.


Assuntos
Angioplastia Coronária com Balão , Derivação Arteriovenosa Cirúrgica , Medicina Preventiva/métodos , Idoso , Angioplastia Coronária com Balão/efeitos adversos , Constrição Patológica/prevenção & controle , Feminino , Antebraço/irrigação sanguínea , Humanos , Masculino , Pessoa de Meia-Idade , Projetos Piloto , Modelos de Riscos Proporcionais , Estudos Prospectivos , Análise de Sobrevida , Trombose/etiologia , Resultado do Tratamento
15.
Eur Radiol ; 12 Suppl 3: S181-4, 2002 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-12522636

RESUMO

The most likely etiology of benign obstruction of the superior vena cava (SVC) include fibrosing mediastinitis and iatrogenic etiologies such as sclerosis and obstruction caused by pacemakers and central venous catheter. Percutaneous stenting of SVC has been used with success both in malignant and benign superior vena cava syndrome; however, long-term follow-up of endovascular procedures is not well known. We present a case of a patient with complete occlusion of SVC of benign etiology, presenting dramatically with bilateral chylothorax and chylopericardium with cardiac tamponade, who underwent successful vena caval revascularization with thrombolytic therapy and placement of self-expanding metallic stent. The 42-month follow-up could encourage endovascular procedures even in SVC syndrome of benign etiology.


Assuntos
Quilotórax/terapia , Derrame Pericárdico/terapia , Síndrome da Veia Cava Superior/terapia , Neoplasias da Mama/tratamento farmacológico , Neoplasias da Mama/radioterapia , Carcinoma Ductal de Mama/tratamento farmacológico , Carcinoma Ductal de Mama/radioterapia , Cateteres de Demora/efeitos adversos , Quilotórax/diagnóstico por imagem , Quilotórax/etiologia , Feminino , Humanos , Pessoa de Meia-Idade , Derrame Pericárdico/diagnóstico por imagem , Derrame Pericárdico/etiologia , Síndrome da Veia Cava Superior/diagnóstico por imagem , Síndrome da Veia Cava Superior/etiologia , Tempo , Tomografia Computadorizada por Raios X , Falha de Tratamento
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