RESUMO
Sarcoidosis is characterised by the formation of noncaseating granulomas classically affecting lungs, lymph nodes and skin. Osteoarticular involvement affects up to 15% of patients; however, acro-osteolysis, destruction involving distal phalanges of fingers and toes, associated with sarcoidosis, is extremely rare. A 44-year-old woman with a history of biopsy-proven sarcoidosis managed with prednisone and methotrexate presented with swelling and pain in the distal fingers of her right hand without skin manifestations. Radiographic imaging showed erosion of distal phalanges on second, third and fifth fingers and bone resorption in bilateral toes. A biopsy of the finger lesions showed noncaseating granulomas consistent with sarcoidosis. She was diagnosed with sarcoid acro-osteolysis and started on adalimumab with clinical and radiographic improvement. While most cases of osteoarticular sarcoidosis are asymptomatic and respond to standard immunosuppression, we present a case with progressive and refractory clinical course. This is the first reported case of sarcoid acro-osteolysis affecting the toes.
Assuntos
Acro-Osteólise , Sarcoidose , Adulto , Feminino , Dedos , Mãos , Humanos , Sarcoidose/diagnóstico , Sarcoidose/diagnóstico por imagem , Dedos do PéRESUMO
INTRODUCTION: The purpose of this study was to find out whether dissemination of gastroenterology and hepatology (GI) research on social media networks correlates with citation count at 5 years. METHODS: We correlated the Altmetric Attention Score with Web of Science citation counts at 5 years for scholarly work published in the 10 highest impact factor GI journals in 2014. RESULTS: In 4,026 analyzed items, the correlation (r) between Altmetric Attention Score and citations at 5 years was 0.62 (P < 0.001), representing strong correlation. Twitter was the platform with the strongest correlation with citations. DISCUSSION: Social media attention garnered by GI scholarly work strongly correlates with the number of citations at 5 years.
Assuntos
Bibliometria , Pesquisa Biomédica , Gastroenterologia , Disseminação de Informação , Mídias Sociais , HumanosRESUMO
Electronic (E)-cigarette use or vaping is associated with pulmonary injury. Users can present with wide-ranging symptoms, varying degrees of pulmonary injury, and respiratory distress. Lung injury secondary to vaping is associated with a variety of patterns on pulmonary imaging. Typical radiographic findings are consistent with bilateral, basilar ground-glass opacities and or consolidation with septal thickening. We present a case of vape-associated pulmonary injury (VAPI) in a previously healthy adult who was found to have atypical radiographic findings. A 34-year-old male presented with a chief complaint of a two-week history of malaise, nausea, cough, and worsening shortness of breath. A chest CT scan without contrast revealed diffuse nodules in a miliary pattern. The patient reported a six-month history of tetrahydrocannabinol (THC) vape use. Bronchoscopy with cytologic analysis confirmed findings consistent with the VAPI. To our knowledge, this is the first report of a "miliary" pattern of infiltrates and nodules in a patient with VAPI. This pattern on CT imaging led to increased suspicion for other possible etiologies, including tuberculosis. Thus, moving forward, we believe that VAPI needs to be considered in the differential diagnosis if a patient presents with radiographic findings consistent with a miliary or diffuse micronodular pattern.
RESUMO
An 83-year-old man with a history of chronic myelogenous leukaemia in remission maintained with bosutinib presented with new-onset fevers. He denied pain and had no other focal symptoms. Ultrasound imaging revealed mild gallbladder wall thickening. Non-contrasted CT revealed right upper quadrant inflammation of indeterminate source. The diagnosis of acalculous cholecystitis was made on the third day when a CT with oral contrast demonstrated a remarkably inflamed biliary tree. The gallbladder was surgically removed and found to be necrotic. The case highlights an unusual presentation for a well-known condition. Both ultrasound and CT have limited diagnostic sensitivity for acalculous cystitis. This case adds to existing literature to support development of acalculous cholecystitis in non-critically ill patients. Clinicians should maintain awareness of this condition among patients presenting to the hospital or clinic with abdominal pain. Careful discussion with radiology and surgery is indicated to guide diagnostic testing when initial imaging results are indeterminate.
Assuntos
Colecistite Acalculosa/diagnóstico , Escherichia coli/isolamento & purificação , Febre/microbiologia , Vesícula Biliar/patologia , Colecistite Acalculosa/complicações , Colecistite Acalculosa/microbiologia , Colecistite Acalculosa/terapia , Idoso de 80 Anos ou mais , Antibacterianos/uso terapêutico , Colecistectomia , Quimioterapia Combinada , Febre/sangue , Febre/imunologia , Febre/terapia , Vesícula Biliar/diagnóstico por imagem , Vesícula Biliar/microbiologia , Vesícula Biliar/cirurgia , Humanos , Masculino , Necrose/complicações , Necrose/diagnóstico , Necrose/microbiologia , Necrose/terapia , Tomografia Computadorizada por Raios X , Resultado do Tratamento , UltrassonografiaRESUMO
Spontaneous tumor lysis syndrome (SPTLS) is a rare phenomenon that can manifest in rapidly proliferating hematological malignancies and solid tumors prior to initiating cytotoxic therapy. We encountered a patient who originally presented with diffuse lymphadenopathy, abdominal distention, and dyspnea, who had laboratory abnormalities suggestive of SPTLS. His peripheral flow cytometry and lymph node biopsy revealed blastoid-variant mantle cell lymphoma. Prior to initiating chemotherapy, acute kidney injury (AKI) and uric acid had improved with intravenous fluids and the initiation of allopurinol. However, after beginning chemotherapy, the patient developed a second AKI concerning for tumor lysis syndrome (TLS). He went on to have renal recovery and did not require renal replacement therapy. With the exception of case reports, there is limited evidence to guide general medicine clinicians who encounter cases of SPTLS. Expert-based guidelines are available to guide use of rasburicase, an uricase enzyme, before initiation of chemotherapy for certain malignancies when risk for TLS is considered high. Despite these guidelines, the role of rasburicase in preventing AKI remains controversial after inconclusive results in a meta-analysis. The causative relationship between uric acid and AKI in TLS is based on a mechanism of tubular obstruction. There are also mechanisms by which uric acid may cause AKI without tubular obstruction related to acute hyperuricemic nephropathy. Further characterization of the role of uric acid in causing AKI in patients without tubular obstruction may identify new mechanisms of injury and offer insight into new treatment strategies.
Assuntos
Injúria Renal Aguda/tratamento farmacológico , Linfoma de Célula do Manto/complicações , Síndrome de Lise Tumoral/complicações , Urato Oxidase/uso terapêutico , Ácido Úrico/sangue , Injúria Renal Aguda/sangue , Injúria Renal Aguda/etiologia , Humanos , Masculino , Pessoa de Meia-Idade , Resultado do Tratamento , Síndrome de Lise Tumoral/etiologiaRESUMO
A 59-year-old male presented with 1 month of progressive dyspnea, 30-lb weight loss, and skin changes on the digits of the hands. In the 4 weeks prior to admission, he was admitted and treated twice for pneumonia at another hospital and received intravenous (IV) vancomycin, ceftriaxone, and azithromycin for a total of 10 days. After admission, he underwent computed tomography imaging of chest, which revealed findings suggestive of interstitial lung disease but given the fact that infection was not ruled out, empiric antibiotics were initiated. The skin lesions on the fingers were felt to be consistent with Gottron's papules, and his overall constellation of findings were felt to be consistent with dermatomyositis (DM). Over the following 3 days, he developed diffuse, violaceous skin lesions, elevation of liver transaminases, and severe thrombocytopenia. The skin lesions progressed to epidermal necrosis. He developed erosions of the oral mucosa and scrotum. Before skin biopsy results were finalized, IV immunoglobulin and IV dexamethasone were started empirically for suspected DM and immune-mediated thrombocytopenia. His laboratory abnormalities normalized within a week. Biopsy results of the skin were consistent with Stevens-Johnson syndrome (SJS). Autoantibody test for anti-MDA5 were positive, confirming a diagnosis of anti-MDA5 associated DM. Subsequent development of SJS was likely due to antibiotic exposure in the preceding month. Simultaneous development of anti-MDA5 DM and SJS raises the question of a link between the 2 conditions. To our knowledge, this is the first reported association of these 2 conditions reported in the literature.
Assuntos
Autoanticorpos/imunologia , Dermatomiosite/imunologia , Helicase IFIH1 Induzida por Interferon/imunologia , Síndrome de Stevens-Johnson/etiologia , Trombocitopenia/etiologia , Autoanticorpos/sangue , Dermatomiosite/complicações , Dermatomiosite/tratamento farmacológico , Dexametasona/administração & dosagem , Humanos , Imunoglobulinas Intravenosas , Masculino , Pessoa de Meia-Idade , Pele/patologia , Síndrome de Stevens-Johnson/patologia , Trombocitopenia/patologiaRESUMO
Systemic capillary leak syndrome is a rare disorder characterized by dysfunctional inflammatory response, endothelial dysfunction, and extravasation of fluid from the vascular space to the interstitial space leading to shock, hemoconcentration, hypoalbuminemia, and subsequent organ failure. The condition may be idiopathic or secondary to an underlying cause, which can include viral infections. Here we describe a patient with acute coronavirus disease 2019 (COVID-19) infection who presented with hemoconcentration, shock, and hypoalbuminemia. The patient subsequently developed rhabdomyolysis and compartment syndrome of all four extremities, requiring fasciotomies. This is the first reported case of systemic capillary leak syndrome associated with COVID-19 infection. This case adds to the evolving spectrum of inflammatory effects associated with this viral infection.
Assuntos
COVID-19/fisiopatologia , Síndrome de Vazamento Capilar/fisiopatologia , Síndromes Compartimentais/fisiopatologia , Hipoalbuminemia/fisiopatologia , Choque/fisiopatologia , Dor Abdominal/etiologia , Acidose Láctica/etiologia , Acidose Láctica/fisiopatologia , Acidose Láctica/terapia , Injúria Renal Aguda/etiologia , Injúria Renal Aguda/fisiopatologia , Injúria Renal Aguda/terapia , COVID-19/complicações , COVID-19/terapia , Síndrome de Vazamento Capilar/etiologia , Síndromes Compartimentais/etiologia , Síndromes Compartimentais/cirurgia , Terapia de Substituição Renal Contínua , Soluções Cristaloides/uso terapêutico , Edema/etiologia , Edema/fisiopatologia , Fasciotomia , Evolução Fatal , Hidratação , Hematócrito , Humanos , Hipoalbuminemia/etiologia , Hipoalbuminemia/terapia , Masculino , Pessoa de Meia-Idade , Respiração Artificial , Rabdomiólise/etiologia , Rabdomiólise/fisiopatologia , Choque/etiologia , Choque/terapia , Tomografia Computadorizada por Raios X , Vasoconstritores/uso terapêuticoRESUMO
BACKGROUND/PURPOSE: The Centers for Medicare and Medicaid services penalizes hospitals with higher than expected readmissions for coronary artery bypass graft surgery (CABG). Little information exists regarding outcomes in patients who sustain an acute myocardial infarction (MI) and undergo CABG as the primary revascularization strategy. Our goal was to determine the unplanned 30-day readmission rate in this high-risk population and predictors of readmission. MATERIALS/METHODS: An institutional database was queried to identify patients from 2011 to 2017 who were admitted with an acute MI and underwent CABG within 30â¯days. Chart review was performed to collect demographics, medical comorbidities and clinical information related to hospital course and readmission status. RESULTS: A total of 150 patients were included. The 30-day unplanned readmission rate was 23%, and the majority (80%) were non-cardiac related. Predictors of unplanned readmission included female sex (OR 2.61, 95% CI 1.042-6.549, pâ¯=â¯0.041), CABG performed <7â¯days following MI (OR 2.82, 95% CI 1.21-6.59, pâ¯=â¯0.017), and post-operative atrial fibrillation (OR 3.25, 95% CI 1.07-9.87, pâ¯=â¯0.038). Complications were identified in 32% of clinic visits in patients who did not require readmission. CONCLUSIONS: Patients who undergo CABG following MI are a high-risk population with nearly one-quarter readmitted within 30â¯days. Female sex, <7â¯days between the index MI and CABG, and post-operative atrial fibrillation are strong predictors for readmission. Early outpatient follow-up may be an effective intervention to reduce hospital readmissions by reassuring patients that non-cardiac symptoms are in line with anticipated post-operative pain and healing.
Assuntos
Ponte de Artéria Coronária/efeitos adversos , Doença da Artéria Coronariana/cirurgia , Infarto do Miocárdio/cirurgia , Readmissão do Paciente , Idoso , Doença da Artéria Coronariana/diagnóstico por imagem , Bases de Dados Factuais , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Infarto do Miocárdio/diagnóstico por imagem , Medição de Risco , Fatores de Risco , Fatores de Tempo , Resultado do TratamentoRESUMO
PURPOSE: We sought to determine the effect of active versus passive voiding trials on time to hospital discharge and rates of urinary tract infection (UTI) and urinary retention (UR). METHODS: We performed a prospective, randomized trial comparing active (AVT) versus passive (PVT) void trials of inpatients requiring urethral catheter removal. Of 329 eligible patients, 274 were randomized to AVT (bladder filled with saline before catheter removal) or PVT (spontaneous bladder filling after catheter removal). Primary outcome was time to hospital discharge. Secondary outcomes were UTI (NSQIP criteria) and UR (requiring repeat catheterization) within 2 weeks of void trial. RESULTS: The median time to void was 18 (5-115) versus 236 (136-360) min in the AVT and PVT groups, respectively (p < 0.0001). However, no difference was seen in comparison of the median time to hospital discharge between AVT [28.4 (13.6-69.3) h] and PVT [30.0 (10.4-75.6) h] cohorts, respectively (p = 0.93). Six (4.8%) and 13 (12.9%) patients developed UTI in the AVT and PVT groups, respectively (p = 0.03). Eleven (8.8%) and 12 (11.9%) patients developed UR in the AVT and PVT groups, respectively (p = 0.36). CONCLUSION: Our study comparing AVT versus PVT demonstrated no difference in time to discharge despite a 3.6 h reduction in time to void associated with AVT. AVT was associated with a 63% reduction in UTI, with no difference seen in UR rates across cohorts. Given the reduction in UTI and technical advantages, our data suggest that AVT should be considered as a recommended technique for void trial protocol. TRIAL REGISTRATION: NCT02886143 (clinicaltrials.gov).
Assuntos
Alta do Paciente , Retenção Urinária/epidemiologia , Infecções Urinárias/epidemiologia , Micção , Remoção de Dispositivo , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Estudos Prospectivos , Fatores de Tempo , Cateteres UrináriosRESUMO
A 39-year-old woman with a history of Roux-en-Y gastric bypass (RYGB) surgery and alcohol use presented with a confluent erythematous rash involving the perineum spreading outward to the abdomen, thighs and lower back. She had angular cheilitis and glossitis. The rash was painful and blistering in scattered areas. She was hypotensive and appeared to be in septic or hypovolemic shock at presentation. Serum levels of zinc and vitamin B6 were critically low and biopsy of her rash returned suggestive of a nutritional deficiency as its source. The rash slowly improved over the following 2 weeks with oral zinc and vitamin B6 replacement. The body rash resembled that of infants born with inherited defects in zinc transporters, referred to as acrodermatitis enteropathica (AE). This case may represent an acquired case of AE in the setting of prior RYGB.
Assuntos
Deficiência de Vitamina B 6/diagnóstico , Vitamina B 6/administração & dosagem , Zinco/administração & dosagem , Zinco/deficiência , Administração Oral , Adulto , Biópsia , Queilite/etiologia , Exantema/etiologia , Derivação Gástrica/efeitos adversos , Humanos , Resultado do Tratamento , Vitamina B 6/uso terapêutico , Deficiência de Vitamina B 6/tratamento farmacológicoRESUMO
A 42-year-old woman with a history of cholangiocarcinoma on adjuvant chemotherapy with capecitabine presented with painless haematochezia. She was found to have an isolated twenty-five mm ulcer in the ascending colon. Biopsies of the ulceration demonstrated typical cytomegalovirus (CMV) inclusions and her peripheral blood CMV PCR was significantly elevated. This is an unusual case of a solitary proximal colon ulcer. Non-steroidal anti-inflammatory drugs, inflammatory bowel disease and malignancy, are the most frequent causes of isolated ulcers in the proximal colon. Gastrointestinal (GI) CMV disease most commonly causes CMV colitis and is considered rare outside of the transplant population and other severely immunosuppressed patient groups. Patients who have received chemotherapy may also be at risk for GI CMV disease. The diagnosis should be suspected in patients who present with haematochezia or watery diarrhoea within a broad window of time after receiving chemotherapy.
Assuntos
Colite/diagnóstico , Colo Ascendente/patologia , Infecções por Citomegalovirus/diagnóstico , Úlcera/diagnóstico , Adulto , Antimetabólitos Antineoplásicos/efeitos adversos , Antivirais/uso terapêutico , Neoplasias dos Ductos Biliares/tratamento farmacológico , Capecitabina/efeitos adversos , Quimioterapia Adjuvante/efeitos adversos , Colangiocarcinoma/tratamento farmacológico , Colite/complicações , Colite/patologia , Colite/virologia , Infecções por Citomegalovirus/complicações , Infecções por Citomegalovirus/tratamento farmacológico , Infecções por Citomegalovirus/patologia , Feminino , Hemorragia Gastrointestinal/etiologia , Humanos , Hospedeiro Imunocomprometido/imunologia , Pancreaticoduodenectomia , Fatores de Risco , Úlcera/complicações , Úlcera/patologia , Úlcera/virologia , Valaciclovir/uso terapêuticoRESUMO
A 33-year-old male with poorly controlled chronic tophaceous gout and chronic kidney disease (CKD) with estimated glomerular filtration rate (GFR) of 37 cc/min. His uric acid was 11 mg/dL despite maximal dosing of febuxostat. He had previously failed pegloticase infusions as well. This patient had a reduction in his uric acid level to less than 6 mg/dL following addition of probenecid to his febuxostat regimen. Most guidelines recommend against utilisation of probenecid therapy in patients with GFR <50, but there is no obvious contraindication to its use, provided renal calculi do not develop. Our case illustrates the synergistic effect probenecid can add to maximal xanthine oxidase inhibitor therapy for patients with refractory hyperuricaemia in a patient with CKD stage IIIb. With the approval of a new uricosuric medication, lesinurad, probenecid may remain a suitable alternative for patients with financial limitations to achieve target uric acid levels.
Assuntos
Febuxostat/uso terapêutico , Deformidades Adquiridas do Pé/tratamento farmacológico , Supressores da Gota/uso terapêutico , Gota/tratamento farmacológico , Probenecid/uso terapêutico , Insuficiência Renal Crônica/tratamento farmacológico , Ácido Úrico/metabolismo , Adulto , Doença Crônica , Quimioterapia Combinada , Deformidades Adquiridas do Pé/diagnóstico por imagem , Deformidades Adquiridas do Pé/fisiopatologia , Gota/metabolismo , Gota/fisiopatologia , Humanos , Masculino , Insuficiência Renal Crônica/metabolismo , Insuficiência Renal Crônica/fisiopatologia , Índice de Gravidade de Doença , Resultado do TratamentoRESUMO
Cardiac-related clinical practice guidelines have become an integral part of the practice of cardiology. Unfortunately, these guidelines are often long, complex, and difficult for practicing cardiologists to use. Guidelines should be condensed and their format upgraded, so that the key messages are easier to comprehend and can be applied more readily by those involved in patient care. After presenting the historical background and describing the guideline structure, we make several recommendations to make clinical practice guidelines more user-friendly for clinical cardiologists. Our most important recommendations are that the clinical cardiology guidelines should focus exclusively on (1) class I recommendations with established benefits that are supported by randomized clinical trials and (2) class III recommendations for diagnostic or therapeutic approaches in which quality studies show no benefit or possible harm. Class II recommendations are not evidence based but reflect expert opinions related to published clinical studies, with potential for personal bias by members of the guideline committee. Class II recommendations should be published separately as "Expert Consensus Statements" or "Task Force Committee Opinions," so that both majority and minority expert opinions can be presented in a less dogmatic form than the way these recommendations currently appear in clinical practice guidelines.
Assuntos
Cardiologia/normas , Guias de Prática Clínica como Assunto/normas , Melhoria de Qualidade , HumanosRESUMO
An increasing number of academic senior physicians are approaching their potential retirement in good health with accumulated clinical and research experience that can be a valuable asset to an academic institution. Considering the need to let the next generation ascend to leadership roles, when and how should a medical career be brought to a close? We explore the roles for academic medical faculty as they move into their senior years and approach various retirement options. The individual and institutional considerations require a frank dialogue among the interested parties to optimize the benefits while minimizing the risks for both. In the United States there is no fixed age for retirement as there is in Europe, but European physicians are initiating changes. What is certain is that careful planning, innovative thinking, and the incorporation of new patterns of medical practice are all part of this complex transition and timing of senior academic physicians into retirement.
Assuntos
Centros Médicos Acadêmicos , Docentes de Medicina , Médicos , Pesquisadores , Aposentadoria , Centros Médicos Acadêmicos/organização & administração , Adulto , Fatores Etários , Idoso , Mobilidade Ocupacional , Competência Clínica , Cognição , Europa (Continente) , Docentes de Medicina/organização & administração , Humanos , Liderança , Pessoa de Meia-Idade , Médicos/organização & administração , Médicos/psicologia , Pesquisadores/organização & administração , Pesquisadores/psicologia , Desenvolvimento de Pessoal , Fatores de Tempo , Estados Unidos , Recursos HumanosRESUMO
PURPOSE: Interfraction and intrafraction changes in amplitude of liver motion were assessed in patients with liver cancer treated with kV cone beam computed tomography (CBCT)-guided stereotactic body radiation therapy (SBRT). METHODS AND MATERIALS: A total of 314 CBCTs obtained with the patient in the treatment position immediately before and after each fraction, and 29 planning 4DCTs were evaluated in 29 patients undergoing six-fraction SBRT for unresectable liver cancer, with (n = 15) and without (n = 14) abdominal compression. Offline, the CBCTs were sorted into 10 bins, based on phase of respiration. Liver motion amplitude was measured using liver-to-liver alignment from the end-exhale and end-inhale CBCT and four-dimensional CT reconstructions. Inter- and intrafraction amplitude changes were measured from the difference between the pre-SBRT CBCTs relative to the planning four-dimensional CT, and from the pre-SBRT and post-SBRT CBCTs, respectively. RESULTS: Mean liver motion amplitude for all patients (range) was 1.8 (0.1-7.0), 8.0 (0.1-18.8), and 4.3 (0.1-12.1) mm in the mediolateral (ML), craniocaudal (CC), and anteroposterior (AP) directions, respectively. Mean absolute inter- and intrafraction liver motion amplitude changes were 1.0 (ML), 1.7 (CC), and 1.6 (AP) mm and 1.3 (ML), 1.6 (CC), and 1.9 (AP) mm, respectively. No significant correlations were found between intrafraction amplitude change and intrafraction time (range, 4:56-25:37 min:sec), and between inter- and intrafraction amplitude changes and liver motion amplitude. Intraobserver reproducibility (sigma, n = 29 fractions) was 1.3 (ML), 1.4 (CC), and 1.4 (AP) mm. CONCLUSIONS: For the majority of liver SBRT patients, the change in liver motion amplitude was minimal over the treatment course and showed no apparent relationships with the magnitude of liver motion and intrafraction time.
Assuntos
Tomografia Computadorizada de Feixe Cônico/métodos , Neoplasias Hepáticas , Fígado , Movimento/fisiologia , Radiocirurgia/métodos , Respiração , Carcinoma Hepatocelular/diagnóstico por imagem , Carcinoma Hepatocelular/cirurgia , Colangiocarcinoma/diagnóstico por imagem , Colangiocarcinoma/cirurgia , Fracionamento da Dose de Radiação , Humanos , Fígado/diagnóstico por imagem , Fígado/cirurgia , Neoplasias Hepáticas/diagnóstico por imagem , Neoplasias Hepáticas/secundário , Neoplasias Hepáticas/cirurgia , Variações Dependentes do Observador , Planejamento da Radioterapia Assistida por Computador/métodosRESUMO
PURPOSE: The inter- and intrafraction variability of liver position was assessed in patients with liver cancer treated with kilovoltage cone-beam computed tomography (CBCT)-guided stereotactic body radiotherapy. METHODS AND MATERIALS: A total of 314 CBCT scans obtained in the treatment position immediately before and after each fraction were evaluated from 29 patients undergoing six-fraction, non-breath-hold stereotactic body radiotherapy for unresectable liver cancer. Off-line, the CBCT scans were sorted into 10 bins, according to the phase of respiration. The liver position (relative to the vertebral bodies) was measured using rigid alignment of the exhale CBCT liver with the exhale planning CT liver, following the alignment of the vertebrae. The interfraction liver position change was measured by comparing the pretreatment CBCT scans, and the intrafraction change was measured from the CBCT scans obtained immediately before and after each fraction. RESULTS: The mean amplitude of liver motion for all patients was 1.8 mm (range, 0.1-5.7), 8.0 mm (range, 0.1-18.8), and 4.3 mm (range 0.1-12.1) in the medial-lateral (ML), craniocaudal (CC), and anteroposterior (AP) directions, respectively. The mean absolute ML, CC, and AP interfraction changes in liver position were 2.0 mm (90th percentile, 4.2), 3.5 mm (90th percentile, 7.3), and 2.3 mm (90th percentile, 4.7). The mean absolute intrafraction ML, CC, and AP changes were 1.3 mm (90th percentile, 2.9), 1.6 mm (90th percentile, 3.6), and 1.5 mm (90th percentile, 3.1), respectively. The interfraction changes were significantly larger than the intrafraction changes, with a CC systematic error of 2.9 and 1.1 mm, respectively. The intraobserver reproducibility (sigma, n = 29 fractions) was 1.3 mm in the ML, 1.4 mm in the CC, and 1.6 mm in the AP direction. CONCLUSION: Interfraction liver position changes relative to the vertebral bodies are an important source of geometric uncertainty, providing a rationale for prefraction soft-tissue image guidance. The intrafraction change in liver position from the beginning to the end of each fraction was small for most patients.
Assuntos
Tomografia Computadorizada de Feixe Cônico , Neoplasias Hepáticas , Fígado , Movimento , Radiocirurgia/métodos , Respiração , Fracionamento da Dose de Radiação , Humanos , Fígado/diagnóstico por imagem , Fígado/cirurgia , Neoplasias Hepáticas/diagnóstico por imagem , Neoplasias Hepáticas/cirurgia , Variações Dependentes do Observador , Planejamento da Radioterapia Assistida por Computador/métodos , Mecânica Respiratória , Coluna Vertebral/diagnóstico por imagemRESUMO
BACKGROUND: There is conflicting literature on the relationship between prolonged QRS duration (QRSd) and arrhythmic events, including sudden cardiac death (SCD), in heart failure patients with or without implantable cardioverter-defibrillators (ICDs). OBJECTIVE: The purpose of this study was to evaluate the prognostic significance of prolonged QRSd relative to arrhythmic outcomes in medically and ICD-treated patients enrolled in the Multicenter Automatic Defibrillator Implantation Trial (MADIT) II. METHODS: Using a Cox proportional hazards model adjusting for ejection fraction, heart failure class, and blood urea nitrogen, we estimated the association of prolonged QRSd >/=140 ms with SCD in the medically treated arm and SCD or first appropriate ICD therapy for rapid ventricular tachycardia/fibrillation (VT/VF; cycle length =260 ms) in the ICD-treated arm. RESULTS: In the medically treated arm, prolonged QRSd was a significant independent predictor of SCD (hazard ratio 2.12; 95% confidence interval 1.20-3.76; P = .01). However, in the ICD-treated arm, prolonged QRSd did not predict SCD or rapid VT/VF (hazard ratio 0.77; 95% CI 0.47-1.24; P = .28). The difference in the prognostic effect of prolonged QRSd in these two groups was significant (P<.01). These results were not affected by varying the cycle length that defines rapid VT/VF or the duration that defines QRSd prolongation. CONCLUSIONS: In patients with prior myocardial infarction and EF =30%, prolonged QRSd does not predict SCD/VT/VF in ICD-treated patients but does predict SCD in medically treated patients. This underscores the nonequivalence of VT/VF and SCD and the need for caution in inferring risk of SCD when using nonrandomized databases that include only patients with ICDs.