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1.
Eur J Vasc Endovasc Surg ; 52(2): 218-24, 2016 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-27357968

RESUMO

OBJECTIVES: Patients with critical limb ischemia (CLI) have poor overall and limb prognosis. Although nutritional status influences overall prognosis, and the Geriatric Nutritional Risk Index (GNRI) is a widely used, simple and well established nutritional status screening method, the association between the GNRI and the overall and limb prognosis of patients with CLI following endovascular therapy (EVT) has not been explored. METHODS: Clinical outcomes were retrospectively evaluated in 473 consecutive patients (74 ± 10 years; 59% male) with CLI who underwent EVT. The GNRI on admission was calculated as follows: [14.89 × albumin (g/dL)] + [41.7 × (body weight/ideal body weight)]. Cox proportional hazard analysis was performed to explore the independent association between the GNRI and mortality and major amputation. RESULTS: Patients (53% ambulatory, 38% wheelchair bound, and 9% bedridden) were divided into two groups based on the median GNRI: the higher group (GNRI ≥ 91.2, n = 237) and the lower group (GNRI < 91.2, n = 236). Median follow up duration after EVT was 11.3 months. Three years after EVT, the survival rate (74% in the higher GNRI, and 48% in the lower GNRI, respectively), and limb salvage rate (92% in the higher GNRI, and 84% in the lower GNRI) were significantly lower in the lower GNRI group. GNRI (hazard ratio [HR], 1.03; 95% confidence interval [CI], 1.01-1.05), along with being wheelchair bound (HR, 1.87; 95% CI 1.17-2.97; vs. ambulatory status), being bedridden (HR, 3.10; 95% CI, 1.63-2.97; vs. ambulatory status), being on hemodialysis (HR, 2.33; 95% CI, 1.49-3.64), and having chronic heart failure (HR, 2.22; 95% CI, 1.44-3.43) were the independent predictors of mortality. The GNRI (HR, 1.04; 95% CI, 1.01-1.07), being bedridden (HR, 4.15; 95% CI, 1.67-10.3; vs. ambulatory status), isolated below knee disease (HR, 2.49; 95% CI, 1.30-4.77), and hemodialysis (HR, 2.44; 95% CI, 1.23-4.85) were independently associated with major amputation. CONCLUSIONS: The GNRI on admission was independently associated with mortality and major amputation after EVT in patients with CLI.


Assuntos
Procedimentos Endovasculares/efeitos adversos , Extremidades/irrigação sanguínea , Avaliação Geriátrica , Isquemia/diagnóstico , Avaliação Nutricional , Idoso , Amputação Cirúrgica/estatística & dados numéricos , Feminino , Humanos , Isquemia/complicações , Isquemia/mortalidade , Masculino , Prognóstico , Modelos de Riscos Proporcionais , Estudos Retrospectivos , Fatores de Risco
2.
Eur J Vasc Endovasc Surg ; 49(5): 565-73, 2015 May.
Artigo em Inglês | MEDLINE | ID: mdl-25747344

RESUMO

OBJECTIVES: Acceptable limb salvage rates underlie the widespread use of endovascular therapy (EVT) for patients with critical limb ischemia (CLI) secondary to isolated infrapopliteal lesions; however, post-EVT delayed wound healing remains a challenge. Predictors of delayed wound healing and their use in risk stratification of EVT in patients with CLI due to isolated infrapopliteal lesions are explored. METHODS: This was a retrospective multicenter study. 871 consecutive critically ischemic limbs were studied. There was tissue loss in 734 patients (age: 71 ± 10 years old; 71% male) who had undergone EVT between April 2004 and December 2012. The wound healing rate after EVT was estimated by the Kaplan-Meier method. The association between baseline characteristics and delayed wound healing was assessed by the Cox proportional hazard model. RESULTS: Diabetes mellitus and regular dialysis were present in 75% (553/734) and 64% (476/734) of patients, respectively; 67% of limbs (585/871) had Rutherford class 5 CLI; 8% (67/871) of wounds were located in the heel only; 25% (219/871) of limbs had Rutherford 6 (involving not only the heel); and 42% (354/871) of wounds were complicated by infection. The rate of freedom from major amputation at 1 year reached 88%, whereas the wound healing rate was 67%. Median time to wound healing was 146 days. By multivariate analysis, non-ambulatory status (hazard ratio [HR], 1.58; 95% confidence interval [CI] 1.31-1.91) serum albumin <3 g/dL (HR 1.42; 95% CI 1.08-1.86), Rutherford 6 (not only heel) (HR 1.68; 95% CI 1.33-2.14), wound infection (HR 1.24; 95% CI 1.03-1.50), EVT not based on angiosome concept (HR 1.28; 95% CI 1.06-1.55), and below the ankle (BTA) 0 vessel runoff after EVT (HR 1.45; 95% CI 1.14-1.86) were independent predictors of delayed wound healing. CONCLUSIONS: Non-ambulatory status, low albumin level, Rutherford 6 (not only heel), wound infection, indirect intervention, and poor BTA runoff were independent predictors for delayed wound healing after EVT in patients with CLI secondary to infrapopliteal lesions, and their use in risk stratification allows estimation of the wound healing rate.


Assuntos
Diabetes Mellitus/epidemiologia , Isquemia/epidemiologia , Salvamento de Membro , Extremidade Inferior/cirurgia , Diálise Renal/estatística & dados numéricos , Cicatrização , Adulto , Idoso , Idoso de 80 Anos ou mais , Feminino , Humanos , Isquemia/cirurgia , Salvamento de Membro/métodos , Extremidade Inferior/irrigação sanguínea , Masculino , Pessoa de Meia-Idade , Prevalência , Estudos Retrospectivos , Fatores de Risco , Resultado do Tratamento , Cicatrização/fisiologia
3.
Eur J Vasc Endovasc Surg ; 47(2): 131-8, 2014 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-24611185

RESUMO

OBJECTIVES: To investigate factors associated with 30-day perioperative complications (POC) after aorto-iliac (AI) stenting, and to compare follow-up cardiovascular prognosis between patients with and without POC. MATERIALS AND METHODS: This was a retrospective multicenter study. We used a multicenter database of 2012 consecutive patients who successfully underwent AI stenting for peripheral arterial disease in 18 centers in Japan from January 2005 to December 2009 to analyze independent predictors of POC and impact of POC on prognosis by logistic regression and a Cox proportional hazard regression model, respectively. RESULTS: Mean age was 71 ± 9 years (median: 72 years; range: 37-98 years), and 1,636 patients (81%) were men. POC occurred in 126 patients (6.3%). In multivariate logistic regression analysis, old age (≥80 years), critical limb ischemia (CLI), and Trans Atlantic Inter-Societal Consensus (TASC) II class C/D were independently associated with POC with adjusted odds ratios and 95% confidence intervals (CI) of 1.9 (1.3-2.9), 2.3 (1.5-3.4), and 2.4 (1.6-3.4), respectively. Out of 2012 patients, 1995 were followed up for more than 30 days (mean: 2.6 ± 1.5 years; range: 2-2,393 days). In a Cox hazard regression model adjusted for baseline clinical characteristics, POC was positively and independently associated with follow-up major adverse cardiac events (adjusted hazard ratio [HR]: 1.9; 95% CI: 1.3-2.8; p = .002), but not with major adverse limb events and target lesion revascularization (adjusted HR: 1.4; 95% CI: 0.7-2.7; p = .25; and adjusted HR: 1.2; 95% CI 0.6-2.6; p = .568), respectively. CONCLUSIONS: Age >80 years, CLI, and TASC C/D lesion were positively associated with POC after AI stenting. Occurrence of POC appears to adversely affect follow-up cardiovascular, but not limb and vessel prognosis.


Assuntos
Angioplastia com Balão/efeitos adversos , Angioplastia com Balão/instrumentação , Doenças da Aorta/terapia , Artéria Ilíaca , Isquemia/terapia , Doença Arterial Periférica/terapia , Stents , Adulto , Fatores Etários , Idoso , Idoso de 80 Anos ou mais , Doenças da Aorta/diagnóstico , Constrição Patológica , Estado Terminal , Feminino , Humanos , Artéria Ilíaca/diagnóstico por imagem , Isquemia/diagnóstico , Japão , Modelos Logísticos , Masculino , Pessoa de Meia-Idade , Análise Multivariada , Razão de Chances , Doença Arterial Periférica/diagnóstico , Modelos de Riscos Proporcionais , Radiografia , Estudos Retrospectivos , Medição de Risco , Fatores de Risco , Fatores de Tempo , Resultado do Tratamento
4.
Artigo em Inglês | MEDLINE | ID: mdl-24110939

RESUMO

In aortic vascular surgery, a navigation system must represent the anatomical map of individual patient in order to detect the important artery. To provide a proper fit for positions along the dorsoventral axis, the spinous process was added to a currently used anatomical point set consisting of four anterior body landmarks. In addition, we attempted to reduce the registration error by compensating for alignment errors resulting from variations in tissue thickness at each landmark. The alignment values were examined using a human phantom consisting of a skeleton model with subcutaneous tissue in the semilateral position. Using this method, a phantom simulation and five clinical trials were performed. Target errors were evaluated at the orifice of the intercostal artery. In the phantom simulation, the error at the target point was 4.1 ± 2.7 mm. However, for one patient undergoing thoracoabdominal aortic aneurysm replacement surgery, the target error was 8.0 mm using the proposed method.


Assuntos
Aorta/cirurgia , Imagens de Fantasmas , Cirurgia Assistida por Computador/métodos , Procedimentos Cirúrgicos Vasculares/métodos , Aneurisma da Aorta Torácica/cirurgia , Desenho de Equipamento , Humanos , Cirurgia Assistida por Computador/instrumentação , Procedimentos Cirúrgicos Vasculares/instrumentação
5.
Eur J Vasc Endovasc Surg ; 46(5): 575-82, 2013 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-24034905

RESUMO

OBJECTIVES: To investigate factors in patients with critical limb ischemia (CLI) and isolated infrapopliteal lesions that adversely affect outcomes of endovascular therapy (EVT) with or without angiosome-oriented revascularization. METHODS: This was a retrospective multicenter study. We used a database of 718 consecutive CLI patients (70 ± 11 years, 75% diabetics, 68% on hemodialysis, 24% Rutherford class 6) with ischemic tissue loss due to isolated infrapopliteal lesions undergoing primary EVT. Primary outcome was MALE (major adverse limb event). Association between indirect EVT (recanalization of a non-angiosome-based artery) and outcome was assessed by Cox proportional hazard regression model. RESULTS: C-reactive protein (CRP) level was >3 mg/dL in 32% of cases. Indirect EVT (in 307 CLI patients, 43%), was associated with MALE (p = .04, hazard ratio [95% confidence interval] 1.25 [1.01, 1.55]), and interacted with CRP >3 mg/dL (p < .004) but not with other baseline characteristics. Indirect EVT with CRP >3 mg/dL had higher MALE risk (HR 2.08), and interacted with diabetes mellitus (DM) presence. Indirect EVT with CRP >3 mg/dL and DM had higher MALE risk (HR 2.17). CONCLUSION: Limb prognosis was equivalent for direct and indirect endovascular revascularization except in the presence of both diabetes and wound infection, when indirect revascularization has a poorer outcome.


Assuntos
Angiopatias Diabéticas/cirurgia , Procedimentos Endovasculares/efeitos adversos , Isquemia/cirurgia , Infecção dos Ferimentos/epidemiologia , Idoso , Idoso de 80 Anos ou mais , Biomarcadores/sangue , Proteína C-Reativa/análise , Estado Terminal , Angiopatias Diabéticas/sangue , Angiopatias Diabéticas/diagnóstico , Angiopatias Diabéticas/epidemiologia , Nefropatias Diabéticas/epidemiologia , Nefropatias Diabéticas/terapia , Feminino , Humanos , Isquemia/sangue , Isquemia/diagnóstico , Isquemia/epidemiologia , Japão/epidemiologia , Estimativa de Kaplan-Meier , Masculino , Pessoa de Meia-Idade , Prevalência , Modelos de Riscos Proporcionais , Diálise Renal , Estudos Retrospectivos , Fatores de Risco , Fatores de Tempo , Resultado do Tratamento , Infecção dos Ferimentos/sangue , Infecção dos Ferimentos/diagnóstico
6.
Eur J Vasc Endovasc Surg ; 44(4): 425-31, 2012 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-22938944

RESUMO

OBJECTIVE: To assess 3- and 12-month angiographic restenosis rates and their clinical impact after infrapopliteal angioplasty. DESIGN: Prospective multicenter study. MATERIALS AND METHODS: We analyzed 68 critical ischemic limbs (tissue loss: 58 limbs) from 63 consecutive patients due to isolated infrapopliteal lesions who underwent angioplasty alone. Primary endpoint was 3-month angiographic restenosis rate; secondary endpoints were 12-month angiographic restenosis rate, and 3- and 12-month rates of mortality, major amputation and reintervention. Three- and 12-month frequency of ambulatory status and of freedom from ischemic symptoms, and time to wound healing in the ischemic wound group, were compared between restenotic and non-restenotic groups. Angiographic restenosis predictors were assessed by multivariable analysis. RESULTS: 95% of cases had 3-month angiography; restenosis rate was 73%: 40% restenosis and 33% re-occlusion. Twelve-month follow-up angiography was conducted for the patients without 3-month angiographic restenosis, and restenosis rate at 12 months was 82%. Non-administration of cilostazol and statin, and chronic total occlusion were 3-month angiographic restenosis predictors. Three- and 12-month mortality was 5% and 12%, respectively. Despite no patients having undergone amputation, 15% had persistent ischemic symptoms, and 48% of limbs underwent reintervention within 12 months. During the same study period, ambulatory status and limbs with complete healing were more frequently observed in the non-restenosis group than in the restenosis group. In the tissue loss group, time to wound healing in the restenosis group was longer than in the non-restenosis group (127 days vs. 66 days, p = 0.02). CONCLUSION: The extremely high angiographic restenosis rate after infrapopliteal angioplasty may adversely impact clinical status improvement.


Assuntos
Angiografia , Angioplastia/métodos , Oclusão de Enxerto Vascular/diagnóstico por imagem , Artéria Poplítea/cirurgia , Idoso , Amputação Cirúrgica/estatística & dados numéricos , Feminino , Seguimentos , Oclusão de Enxerto Vascular/epidemiologia , Oclusão de Enxerto Vascular/cirurgia , Humanos , Incidência , Isquemia/diagnóstico por imagem , Isquemia/cirurgia , Japão/epidemiologia , Perna (Membro)/irrigação sanguínea , Masculino , Artéria Poplítea/diagnóstico por imagem , Prognóstico , Estudos Prospectivos , Falha de Prótese , Reoperação/estatística & dados numéricos , Taxa de Sobrevida , Fatores de Tempo
7.
Eur J Vasc Endovasc Surg ; 44(3): 318-24, 2012 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-22682012

RESUMO

OBJECTIVE: To identify anatomical factors associated with major adverse limb events (MALE) after angioplasty as the basis for a novel morphology-driven classification of infrapopliteal lesions. DESIGN: Retrospective-multicenter study. MATERIALS AND METHODS: Between March 2004 and October 2010, 1057 limbs from 884 patients with CLI due to isolated infrapopliteal lesions were studied. Freedom-from MALE, defined as major amputation or any reintervention, was assessed out to 2 years by the Kaplan-Meier methods. Anatomical predictors and risk stratification for MALE were analyzed by multivariate analysis. RESULTS: Freedom-from MALE was 47 ± 1% at 2 years. Lesion calcification, target vessel diameter<3.0 mm, lesion length>300 mm and no below-the-ankle (BA) run-off were positively associated with MALE by multivariate-analysis. The total number of risk factors was used to calculate the risk score for each limbs for subsequent categorization into 3 groups with 0 or 1 (low-risk), 2 (moderate-risk) and 3 or 4 (high-risk) factors. Freedom-from MALE at 2 year-rates was 59% in low-risk, 46% in moderate-risk, and 29% in high-risk, respectively. CONCLUSION: Target vessel diameter <3.0 mm, lesion calcification, lesion length > 300 mm and no-BA run-off were associated with MALE after infrapopliteal angioplasty. Risk stratification based on these predictors allows estimation of future incidence of MALE in CLI with isolated infrapopliteal lesions.


Assuntos
Angioplastia com Balão/efeitos adversos , Arteriopatias Oclusivas/terapia , Isquemia/terapia , Artéria Poplítea , Calcificação Vascular/terapia , Idoso , Idoso de 80 Anos ou mais , Angiografia Digital , Índice Tornozelo-Braço , Arteriopatias Oclusivas/complicações , Arteriopatias Oclusivas/diagnóstico , Arteriopatias Oclusivas/fisiopatologia , Distribuição de Qui-Quadrado , Constrição Patológica , Estado Terminal , Feminino , Hemodinâmica , Humanos , Isquemia/diagnóstico , Isquemia/etiologia , Isquemia/fisiopatologia , Japão , Estimativa de Kaplan-Meier , Masculino , Pessoa de Meia-Idade , Análise Multivariada , Artéria Poplítea/diagnóstico por imagem , Artéria Poplítea/fisiopatologia , Modelos de Riscos Proporcionais , Sistema de Registros , Estudos Retrospectivos , Medição de Risco , Fatores de Risco , Índice de Gravidade de Doença , Fatores de Tempo , Resultado do Tratamento , Ultrassonografia Doppler Dupla , Calcificação Vascular/complicações , Calcificação Vascular/diagnóstico , Calcificação Vascular/fisiopatologia
8.
Eur J Vasc Endovasc Surg ; 43(3): 313-21, 2012 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-22240338

RESUMO

OBJECTIVES: To assess and risk stratify midterm clinical outcomes after endovascular therapy (EVT) by angioplasty only of patients with critical limb ischaemia (CLI) due to isolated below-the-knee (BTK) lesions. DESIGN: Retrospective multicenter study. MATERIALS AND METHODS: Between March 2004 and October 2010, 465 limbs (Rutherford 5 and 6: 79%) from 406 patients were studied. Overall survival, limb salvage, and re-intervention were examined out to 3 years by the Kaplan-Meier method and the log-rank test. Their independent predictors and risk stratification were analysed. RESULTS: Patient age was 71 ± 11 yrs, with 69% diabetics and 60% on dialysis. Mean follow-up was 18 ± 15 months. Overall survival was 76 ± 2 and 57 ± 4% at 1 and 3, years, respectively. Survival predictors were body mass index <18, non-ambulatory status and ejection fraction <45%. Two-year limb salvage rate was 80 ± 2%. Factors associated with major amputation were ulcers (Rutherford 6), diabetes mellitus, C-reactive protein>5 mg/dL, and age < 60 years. Two-year freedom from re-intervention was 66 ± 3%; age and below-the-ankle runoff number after angioplasty was negatively associated with re-intervention. CONCLUSIONS: Despite relatively high mortality and re-intervention rates, limb salvage rate was acceptable after EVT for CLI patients with isolated BTK lesions. Risk stratification allows occurrence estimation for each end point.


Assuntos
Angioplastia com Balão , Isquemia/cirurgia , Perna (Membro)/irrigação sanguínea , Perna (Membro)/cirurgia , Salvamento de Membro/métodos , Salvamento de Membro/estatística & dados numéricos , Idoso , Amputação Cirúrgica , Doenças Cardiovasculares/epidemiologia , Causas de Morte , Comorbidade , Diabetes Mellitus/epidemiologia , Dislipidemias/epidemiologia , Feminino , Seguimentos , Humanos , Hipertensão/epidemiologia , Isquemia/mortalidade , Falência Renal Crônica/epidemiologia , Masculino , Pessoa de Meia-Idade , Reoperação , Estudos Retrospectivos , Fatores de Risco , Fumar/epidemiologia , Taxa de Sobrevida , Resultado do Tratamento
9.
Acta Clin Belg ; 60(4): 198-200, 2005.
Artigo em Inglês | MEDLINE | ID: mdl-16279401

RESUMO

Portal vein gas is a rare but potentially lethal condition commonly caused by mucosal damage, bowel distention and sepsis. However, the association between portal vein gas and concurrent chemoradiotherapy has not been documented. We present the case of a 56-year old woman with portal vein gas revealed on computed tomography (CT) after concurrent chemoradiotherapy for advanced oesophageal carcinoma. The portal vein gas totally disappeared 10 days later without any specific treatment. This case demonstrates that the option of close observation for portal vein gas after concurrent chemoradiotherapy is appropriate for consideration. If physical examination, CT findings and laboratory data are unremarkable, it is essential that the patient undergoes close observation and repeated follow-up CT.


Assuntos
Carcinoma de Células Escamosas/tratamento farmacológico , Carcinoma de Células Escamosas/radioterapia , Embolia Aérea/etiologia , Neoplasias Esofágicas/tratamento farmacológico , Neoplasias Esofágicas/radioterapia , Veia Porta , Biópsia , Carcinoma de Células Escamosas/patologia , Terapia Combinada/efeitos adversos , Embolia Aérea/diagnóstico por imagem , Neoplasias Esofágicas/patologia , Seguimentos , Humanos , Masculino , Pessoa de Meia-Idade , Remissão Espontânea , Tomografia Computadorizada por Raios X
12.
J Appl Clin Med Phys ; 4(2): 112-9, 2003.
Artigo em Inglês | MEDLINE | ID: mdl-12777145

RESUMO

A computed tomography (CT) scanner was installed in the linear accelerator room (Primatom) at Morristown. Since June 2000, we have been providing prostate, lung, and liver cancer patients with fusion of CT and linac radiation treatment. This paper describes our registration methods between planning and treatment CT images, and compares treatment localization by CT versus conventional localization by bony landmarks such as portal imaging. For image registration, we printed out beforehand the beam's eye view of the treatment fields. Prostate tumor volume from each Primatom CT slice was mapped on the printouts, and the necessary isocenter shift relative to the skin marks was deduced. No port film was necessary for our Primatom patients. For ten patients we generated digitally-reconstructed radiographs (DRRs) with bone contrast from the CT scans, and deduced the required shift as the difference between the DRRs of the Primatom CT versus the planning CT. This represented the best observable shift should portal imaging be employed. Shift from bony landmark significantly correlated with the Primatom CT shift. Positioning adjustment based on bony anatomy was generally in the same direction as the CT shift for individual patient, but frequently did not go far enough. Our study confirmed that prostate organ motion relative to the bones has an average length of 4.7 mm (with standard deviation of 2.7 mm), and indicated the superiority of CT versus conventional bony structure (such as portal imaging) localization.


Assuntos
Radioterapia Assistida por Computador/métodos , Tomografia Computadorizada por Raios X/métodos , Humanos , Masculino , Veia Porta/anatomia & histologia , Veia Porta/diagnóstico por imagem , Neoplasias da Próstata/radioterapia , Radioterapia Assistida por Computador/instrumentação , Tomógrafos Computadorizados
13.
Am J Clin Oncol ; 26(3): e37-44, 2003 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-12796614

RESUMO

One of the major concerns with multileaf collimators (MLC) is the jagged field edge that produces a larger penumbra compared with that produced by a Cerrobend block. The dosimetric undulation of the MLC can be minimized by replacing an existing MLC with a mini-MLC, an expensive replacement, or by software implementation, which essentially converts a regular MLC into a virtual mini-MLC. In this study, the dosimetry in the penumbra region of a virtual mini-MLC replacing the Cerrobend block is investigated for clinical applications. HD270, a software program implemented by Siemens (Concord, CA), combines the use of an MLC and a table translation perpendicular to the leaf plane to produce a smooth field edge, thus reducing isodose undulation. Three different step resolutions are available: 5 mm, 3 mm, and 2 mm. Using film dosimetry, the penumbra regions are studied at two different depths for clinical blocks and corresponding MLC setup, as well as HD270 with different resolutions for both 6-MV and 15-MV x-ray beams. The dose delivery time for HD270 on auto-sequencing mode is compared with the use of Cerrobend blocks. The clinical applications of HD270 in head-and-neck (head and neck) and prostate treatments are investigated. For single-field irradiation, the 80-20% penumbra widths for both the 45 degrees block and the circular block are reduced with HD270 compared with MLC for both 6 and 15 MV at different depths. At 2-mm resolution, the scalloping isodose lines (IDLs) with MLC completely disappear, although the penumbra is still larger than the Cerrobend block. On the other hand, the difference in dose undulations between 2-mm and 3-mm resolution is small. In the head and neck irradiation, the 80-20% widths with HD270 are 1 to 2 mm less than MLC, but they are still 2 mm wider than with a Cerrobend block. The 50% IDL is reduced by 2 mm with HD270 compared with MLC, which provides safety near spinal cord. Dose-volume histogram (DVH) calculations for the different shielding techniques indicate that the HD270 improves the spinal cord dose distribution significantly compared with MLC. A similar improvement in dose undulation is observed for the prostate case. In the dose region, >60% of the prescribed dose, there is approximately 10% less irradiated volume for the rectum when HD270 (3 mm resolution) is employed compared with MLC. The treatment time was compared with that from the Cerrobend block, and it was found that even at 3-mm resolution, there is a 20% reduction in treatment time in a head and neck treatment; with a 2-mm resolution, there is a 15% increase in time. The isodose undulation due to MLC can be significantly reduced with the HD270. Clinical application with HD270 for head and neck and prostate irradiation provides a smaller penumbra region compared with MLC, although it still gives a larger one compared with the Cerrobend block. In the clinical cases presented in this study, the 3-mm resolution is the most effective in improving the penumbra and delivery time. The HD270 implementation is a versatile and cost-effective solution for reducing MLC undulation.


Assuntos
Neoplasias de Cabeça e Pescoço/radioterapia , Neoplasias da Próstata/radioterapia , Radioterapia Conformacional , Feminino , Humanos , Masculino , Radiometria , Radioterapia de Alta Energia
14.
Br J Radiol ; 75(891): 238-42, 2002 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-11932217

RESUMO

The purpose of this study was to evaluate severe complications that developed after high dose rate (HDR) intracavitary brachytherapy for oesophageal carcinoma. Six consecutive patients with oesophageal carcinoma were treated by external beam irradiation (60 Gy in 30 fractions over 6 weeks) followed by hypofractionated intracavitary HDR brachytherapy (10 Gy in 2 fractions). Two of the six patients were alive and well for more than 2-3 years following therapy, but three of the six patients developed treatment-related oesophageal fistulae and died. HDR intracavitary brachytherapy following external beam irradiation is an effective method for radical treatment of oesophageal carcinoma. However, hypofractionated HDR brachytherapy should be used with care.


Assuntos
Braquiterapia/efeitos adversos , Carcinoma de Células Escamosas/radioterapia , Neoplasias Esofágicas/radioterapia , Lesões por Radiação/etiologia , Radioterapia de Alta Energia/efeitos adversos , Idoso , Carcinoma de Células Escamosas/patologia , Fracionamento da Dose de Radiação , Fístula Esofágica/diagnóstico por imagem , Fístula Esofágica/etiologia , Neoplasias Esofágicas/patologia , Seguimentos , Humanos , Masculino , Pessoa de Meia-Idade , Estadiamento de Neoplasias , Taxa de Sobrevida , Tomografia Computadorizada por Raios X
15.
J Clin Endocrinol Metab ; 86(12): 5854-9, 2001 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-11739451

RESUMO

Ghrelin is a novel GH-releasing peptide that may also induce vasodilation and a positive energy balance through GH-independent mechanisms. However, the hemodynamic, renal, and hormonal effects of ghrelin in patients with chronic heart failure (CHF) remain unknown. Accordingly, 12 patients with CHF were given an iv infusion of human ghrelin (0.1 microg/kg.min) or placebo. Ghrelin significantly decreased mean arterial pressure (-9 mm Hg, P < 0.05) without a significant change in heart rate. Ghrelin significantly increased cardiac index (+25%, P < 0.05) and stroke volume index (+30%, P < 0.05), although it did not significantly alter mean pulmonary arterial pressure or pulmonary capillary wedge pressure. Infusion of ghrelin induced a marked increase in serum GH level (15-fold), associated with slight increases in circulating epinephrine, ACTH, cortisol, and PRL. Infusion of ghrelin did not significantly alter urine volume, urinary sodium excretion, or creatinine clearance. These hemodynamic, renal and hormonal parameters remained unchanged during placebo infusion. In summary, iv infusion of ghrelin, a potent GH-releasing peptide, had beneficial hemodynamic effects in patients with CHF in the absence of renal effects.


Assuntos
Baixo Débito Cardíaco/tratamento farmacológico , Baixo Débito Cardíaco/fisiopatologia , Hemodinâmica/efeitos dos fármacos , Hormônios/sangue , Rim/efeitos dos fármacos , Hormônios Peptídicos , Peptídeos/uso terapêutico , Idoso , Doença Crônica , Método Duplo-Cego , Feminino , Grelina , Humanos , Infusões Intravenosas , Masculino , Pessoa de Meia-Idade , Peptídeos/sangue
16.
Int J Radiat Oncol Biol Phys ; 51(3): 666-70, 2001 Nov 01.
Artigo em Inglês | MEDLINE | ID: mdl-11597807

RESUMO

PURPOSE: Stereotactic radiotherapy (SRT) is highly effective for brain metastases from non-small-cell lung cancers (NSCLCs). As such, primary lesions of NSCLC may also be treated effectively by similar focal high-dose SRT. METHODS AND MATERIALS: Between October 1994 and June 1999, 50 patients with pathologically proven T1-2N0 M0 NSCLC were treated by CT-guided frameless SRT. Of these, 21 patients were medically inoperable and the remainder were medically operable but refused surgery. In most patients, SRT was 50-60 Gy in 5-10 fractions for 1-2 weeks. Eighteen patients also received conventional radiotherapy of 40-60 Gy in 20-33 fractions before SRT. RESULTS: With a median follow-up period of 36 months (range 22-66), 30 patients were alive and disease free, 3 were alive with disease, 6 had died of disease, and 11 had died intercurrently. Local progression was not observed on follow-up CT scans in 47 (94%) of 50 patients. The 3-year overall survival rate was 66% in all 50 patients and 86% in the 29 medically operable patients. The 3-year cause-specific survival rate of all 50 patients was 88%. No definite adverse effects related to SRT were noted, except for 2 patients with a minor bone fracture and 6 patients with temporary pleural pain. CONCLUSIONS: SRT is a very safe and effective treatment for Stage I NSCLC. Additional studies involving a larger patient population and longer follow-up periods are warranted to assess this new treatment for early-stage lung cancer.


Assuntos
Carcinoma Pulmonar de Células não Pequenas/cirurgia , Neoplasias Pulmonares/cirurgia , Radiocirurgia/métodos , Tomografia Computadorizada por Raios X , Adenocarcinoma/diagnóstico por imagem , Adenocarcinoma/cirurgia , Idoso , Idoso de 80 Anos ou mais , Carcinoma Pulmonar de Células não Pequenas/diagnóstico por imagem , Carcinoma de Células Escamosas/diagnóstico por imagem , Carcinoma de Células Escamosas/cirurgia , Feminino , Humanos , Neoplasias Pulmonares/diagnóstico por imagem , Masculino , Pessoa de Meia-Idade , Radiografia Intervencionista , Dosagem Radioterapêutica , Resultado do Tratamento
17.
Circulation ; 104(17): 2034-8, 2001 Oct 23.
Artigo em Inglês | MEDLINE | ID: mdl-11673342

RESUMO

BACKGROUND: Ghrelin is a novel growth hormone (GH)-releasing peptide, isolated from the stomach, that may also cause a positive energy balance by stimulating food intake and inducing adiposity. We sought to investigate the pathophysiology of ghrelin in the cachexia associated with chronic heart failure (CHF). METHODS AND RESULTS: Plasma ghrelin was measured in 74 patients with CHF and 12 control subjects, together with potentially important anabolic and catabolic factors, such as GH and tumor necrosis factor (TNF-alpha). Patients with CHF were divided into two groups, those with cachexia (n=28) and those without cachexia (n=46). Plasma ghrelin did not significantly differ between all CHF patients and controls (181+/-10 versus 140+/-14 fmol/mL, P=NS). However, plasma ghrelin was significantly higher in CHF patients with cachexia than in those without cachexia (237+/-18 versus 147+/-10 fmol/mL, P<0.001). Circulating GH, TNF-alpha, norepinephrine, and angiotensin II were also significantly higher in CHF patients with cachexia than in those without cachexia. Interestingly, plasma ghrelin correlated positively with GH (r=0.28, P<0.05) and TNF-alpha (r=0.31, P<0.05) and negatively with body mass index (r=-0.35, P<0.01). CONCLUSIONS: Plasma ghrelin was elevated in cachectic patients with CHF, associated with increases in GH and TNF-alpha and a decrease in body mass index. Considering ghrelin-induced positive energy effects, increased ghrelin may represent a compensatory mechanism under catabolic-anabolic imbalance in cachectic patients with CHF.


Assuntos
Caquexia/fisiopatologia , Insuficiência Cardíaca/fisiopatologia , Hormônios Peptídicos , Peptídeos/sangue , Adolescente , Adulto , Idoso , Idoso de 80 Anos ou mais , Aldosterona/sangue , Angiotensina II/sangue , Índice de Massa Corporal , Caquexia/complicações , Caquexia/diagnóstico , Doença Crônica , Metabolismo Energético , Feminino , Grelina , Hormônio do Crescimento/sangue , Insuficiência Cardíaca/complicações , Insuficiência Cardíaca/diagnóstico , Humanos , Masculino , Pessoa de Meia-Idade , Norepinefrina/sangue , Valor Preditivo dos Testes , Renina/sangue , Fator de Necrose Tumoral alfa/metabolismo
18.
Circulation ; 104(12): 1430-5, 2001 Sep 18.
Artigo em Inglês | MEDLINE | ID: mdl-11560861

RESUMO

BACKGROUND: Ghrelin is a novel growth hormone (GH)-releasing peptide that may also induce vasodilation and stimulate feeding through GH-independent mechanisms. We investigated whether ghrelin improves left ventricular (LV) dysfunction and attenuates cardiac cachexia in rats with chronic heart failure (CHF). METHODS AND RESULTS: Ligation of the left coronary artery or sham operation was performed; 4 weeks after surgery, rat ghrelin (100 microg/kg SC BID) or saline was administered for 3 weeks. Echocardiography and cardiac catheterization were performed. Serum GH and insulin-like growth factor-1 were significantly higher in both CHF and sham rats treated with ghrelin than in those given placebo (P<0.05 for both). CHF rats given placebo showed an impaired increase in body weight compared with sham rats given placebo (P<0.05). CHF rats treated with ghrelin, however, showed a significantly greater increase in body weight than those given placebo (+10% versus +3%, P<0.05). They showed significantly higher cardiac output (315+/-49 versus 266+/-31 mL. min(-1). kg(-1), P<0.05) and LV dP/dt(max) (5738+/-908 versus 4363+/-973 mm Hg/s, P<0.05) than CHF rats given placebo. Ghrelin increased diastolic thickness of the noninfarcted posterior wall, inhibited LV enlargement, and increased LV fractional shortening in CHF rats (from 15+/-3% to 19+/-3%, P<0.05). CONCLUSIONS: Chronic subcutaneous administration of ghrelin improved LV dysfunction and attenuated the development of LV remodeling and cardiac cachexia in rats with CHF.


Assuntos
Caquexia/prevenção & controle , Insuficiência Cardíaca/tratamento farmacológico , Insuficiência Cardíaca/fisiopatologia , Hormônios Peptídicos , Peptídeos/administração & dosagem , Disfunção Ventricular Esquerda/tratamento farmacológico , Disfunção Ventricular Esquerda/fisiopatologia , Animais , Peso Corporal/efeitos dos fármacos , Separação Celular , Doença Crônica , Modelos Animais de Doenças , Esquema de Medicação , Ecocardiografia , Grelina , Hormônio do Crescimento/sangue , Coração/efeitos dos fármacos , Coração/fisiopatologia , Insuficiência Cardíaca/complicações , Hemodinâmica/efeitos dos fármacos , Injeções Subcutâneas , Fator de Crescimento Insulin-Like I/metabolismo , Masculino , Contração Miocárdica/efeitos dos fármacos , Miocárdio/citologia , Ratos , Ratos Wistar , Disfunção Ventricular Esquerda/complicações
19.
Tumori ; 87(3): 162-5, 2001.
Artigo em Inglês | MEDLINE | ID: mdl-11504371

RESUMO

We report on a patient with choriocarcinoma in the pineal region who was successfully treated with stereotactic radiation therapy (SRT). The increased level of serum human chorionic gonadotropin (HCG) was lowered during chemotherapy with etoposide, cisplatin, and ifosfamide. However, HCG was not normalized and magnetic resonance images still showed an enhanced tumor mass with gadolinium. The patient underwent SRT of 40 Gy at an 80% isodose line per 10 fractions over two weeks, followed by conventional craniospinal irradiation of 32.4 Gy. The level of HCG dropped below the detection limit. The patient has been in good condition for more than four years after the completion of treatment, without any signs of recurrence. We propose SRT as a valid treatment option for malignant germ cell tumors in the pineal region.


Assuntos
Neoplasias Encefálicas/cirurgia , Coriocarcinoma/cirurgia , Radiocirurgia , Adulto , Neoplasias Encefálicas/diagnóstico por imagem , Neoplasias Encefálicas/patologia , Coriocarcinoma/diagnóstico por imagem , Coriocarcinoma/patologia , Humanos , Imuno-Histoquímica , Imageamento por Ressonância Magnética , Masculino , Tomografia Computadorizada por Raios X , Resultado do Tratamento
20.
Ann Vasc Surg ; 15(4): 485-7, 2001 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-11525542

RESUMO

An uncommon case of multiple venous aneurysm of the basilic vein was diagnosed in a 61-year-old woman who presented with a left arm mass. The lesion was successfully resected with day surgery. Clinical features, including the complications, treatment, and etiology of these exceedingly uncommon lesions, are discussed.


Assuntos
Aneurisma/diagnóstico , Braço/irrigação sanguínea , Diagnóstico Diferencial , Feminino , Humanos , Pessoa de Meia-Idade , Veias
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