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1.
Liver Transpl ; 2024 Mar 27.
Artículo en Inglés | MEDLINE | ID: mdl-38535617

RESUMEN

Understanding the economics of pediatric liver transplantation (LT) is central to high-value care initiatives. We examined cost and resource utilization in pediatric LT nationally to identify drivers of cost and hospital factors associated with greater total cost of care. We reviewed 3295 children (<21 y) receiving an LT from 2010 to 2020 in the Pediatric Health Information System to study cost, both per LT and service line, and associated mortality, complications, and resource utilization. To facilitate comparisons, patients were stratified into high-cost, intermediate-cost, or low-cost tertiles based on LT cost. The median cost per LT was $150,836 [IQR $104,481-$250,129], with marked variance in cost within and between hospital tertiles. High-cost hospitals (HCHs) cared for more patients with the highest severity of illness and mortality risk levels (67% and 29%, respectively), compared to intermediate-cost (60%, 21%; p <0.001) and low-cost (51%, 16%; p <0.001) hospitals. Patients at HCHs experienced a higher prevalence of mechanical ventilation, total parental nutrition use, renal comorbidities, and surgical complications than other tertiles. Clinical (27.5%), laboratory (15.1%), and pharmacy (11.9%) service lines contributed most to the total cost. Renal comorbidities ($69,563) and total parental nutrition use ($33,192) were large, independent contributors to total cost, irrespective of the cost tertile ( p <0.001). There exists a significant variation in pediatric LT cost, with HCHs caring for more patients with higher illness acuity and resource needs. Studies are needed to examine drivers of cost and associated outcomes more granularly, with the goal of defining value and standardizing care. Such efforts may uniquely benefit the sicker patients requiring the strategic resources located within HCHs to achieve the best outcomes.

2.
J Allergy Clin Immunol Pract ; 10(12): 3141-3144, 2022 12.
Artículo en Inglés | MEDLINE | ID: mdl-36496209

RESUMEN

Optimal quality within health care is no longer narrowly focused on preventing harm and has evolved to include the attainment of best outcomes through an understanding of the features attributed to effectively delivering care in complex work environments. The use of the electronic health record has contributed greatly to creating a repository of data that can be leveraged to comprehend the details associated with health care delivery. Medical knowledge alone is no longer sufficient to guarantee safe care or ensure the best outcomes. Clinicians who wish to achieve successful outcomes in the future must partner with their organizations to invest in appropriate infrastructure, anticipate increased accountability, manage an ever-increasing volume of data, and commit to learning how they must both change in order to succeed.


Asunto(s)
Registros Electrónicos de Salud , Humanos
3.
Pediatr Crit Care Med ; 22(8): e427-e436, 2021 08 01.
Artículo en Inglés | MEDLINE | ID: mdl-33653995

RESUMEN

OBJECTIVES: Coronavirus disease 2019 containment strategies created challenges with patient-centered ICU rounds. We examined how hybrid rounds with virtual communication added to in-person rounds could facilitate social distancing while maintaining patient-centered care. DESIGN: Continuous quality improvement. SETTING: Quaternary care referral pediatric hospital. PATIENTS: Daytime rounds conducted on PICU patients. INTERVENTIONS: Following a needs assessment survey and pilot trials, multiple technological solutions were implemented in a series of plan-do-study-act cycles. Hybrid rounds model was deployed where a videoconference platform was used to establish communication between the bedside personnel (nurse, patient/family, and partial ICU team) with remotely located remaining ICU team, ancillary, and consultant providers. Floor labels marking 6-feet distance were placed for rounders. MEASUREMENTS AND MAIN RESULTS: Outcome metrics included compliance with social distancing, mixed methods analysis of surveys, direct interviews of providers and families, and reports of safety concerns. The clinicians adopted hybrid rounds readily. Compliance with social distancing and use of floor labels needed reminders. One-hundred fourteen providers completed the feedback survey. Twenty-five providers and 11 families were interviewed. Feedback about hybrid rounds included inability to teach effectively, suboptimal audio-video quality, loss of situational awareness of patient/unit acuity, alarm interference, and inability to socially distance during other ICU interactions. Benefits noted were improved ancillary input, fewer interruptions, improved efficiency, opportunity to integrate with data platforms, and engage remote consultants and families. Nurses and families appreciated the efforts to ensure safety but wanted the ICU attending/fellow supervising the team to participate at bedside, during rounds. Clinicians appreciated the multidisciplinary input but felt that teaching was difficult. CONCLUSIONS: Hybrid rounds employed during pandemic facilitated social distancing while retaining patient-centered multidisciplinary ICU rounds but compromised teaching during rounds. A change to ingrained rounding habits needs team commitment and ongoing optimization. The hybrid rounds model has potential for generalizability to other settings.


Asunto(s)
COVID-19 , Rondas de Enseñanza , Niño , Comunicación , Humanos , Unidades de Cuidados Intensivos , Pandemias , Grupo de Atención al Paciente , SARS-CoV-2
4.
Curr Probl Diagn Radiol ; 50(2): 156-158, 2021.
Artículo en Inglés | MEDLINE | ID: mdl-31611010

RESUMEN

INTRODUCTION: Percutaneous renal transplant biopsies have long been a safe and effective procedure with bleeding being the most common significant complication. Only a few studies, however, have addressed the need for intravenous access prior to the procedure. OBJECTIVES: We postulate that the number of patients requiring intravenous resuscitation after a routine renal transplant biopsy is sufficiently low enough to prove that eliminating pre-procedural peripheral IV placement will have no negative impact on patient safety and could improve departmental efficiency. METHODS: This is a retrospective analysis of complications that occurred in patients who underwent routine percutaneous renal transplant biopsies at an academic center. Patients were divided into two groups: the IV cohort that had peripheral IV access placed before the procedure (n=1318) and the no-IV cohort that did not (n=492). RESULTS: This is a retrospective analysis of complications that occurred in patients who underwent routine percutaneous renal transplant biopsies at an academic center. Patients were divided into two groups: the IV cohort that had peripheral IV access placed before the procedure (n=1318) and the no-IV cohort that did not (n=492). CONCLUSIONS: Placement of prophylactic peripheral IV access in patients undergoing routine renal transplant biopsies does not significantly impact the rate of biopsy complications.


Asunto(s)
Trasplante de Riñón , Biopsia , Humanos , Seguridad del Paciente , Estudios Retrospectivos
6.
Intensive Care Med ; 46(Suppl 1): 10-67, 2020 02.
Artículo en Inglés | MEDLINE | ID: mdl-32030529

RESUMEN

OBJECTIVES: To develop evidence-based recommendations for clinicians caring for children (including infants, school-aged children, and adolescents) with septic shock and other sepsis-associated organ dysfunction. DESIGN: A panel of 49 international experts, representing 12 international organizations, as well as three methodologists and three public members was convened. Panel members assembled at key international meetings (for those panel members attending the conference), and a stand-alone meeting was held for all panel members in November 2018. A formal conflict-of-interest policy was developed at the onset of the process and enforced throughout. Teleconferences and electronic-based discussion among the chairs, co-chairs, methodologists, and group heads, as well as within subgroups, served as an integral part of the guideline development process. METHODS: The panel consisted of six subgroups: recognition and management of infection, hemodynamics and resuscitation, ventilation, endocrine and metabolic therapies, adjunctive therapies, and research priorities. We conducted a systematic review for each Population, Intervention, Control, and Outcomes question to identify the best available evidence, statistically summarized the evidence, and then assessed the quality of evidence using the Grading of Recommendations Assessment, Development, and Evaluation approach. We used the evidence-to-decision framework to formulate recommendations as strong or weak, or as a best practice statement. In addition, "in our practice" statements were included when evidence was inconclusive to issue a recommendation, but the panel felt that some guidance based on practice patterns may be appropriate. RESULTS: The panel provided 77 statements on the management and resuscitation of children with septic shock and other sepsis-associated organ dysfunction. Overall, six were strong recommendations, 49 were weak recommendations, and nine were best-practice statements. For 13 questions, no recommendations could be made; but, for 10 of these, "in our practice" statements were provided. In addition, 52 research priorities were identified. CONCLUSIONS: A large cohort of international experts was able to achieve consensus regarding many recommendations for the best care of children with sepsis, acknowledging that most aspects of care had relatively low quality of evidence resulting in the frequent issuance of weak recommendations. Despite this challenge, these recommendations regarding the management of children with septic shock and other sepsis-associated organ dysfunction provide a foundation for consistent care to improve outcomes and inform future research.


Asunto(s)
Guías como Asunto , Pediatría/tendencias , Sepsis/terapia , Adolescente , Niño , Preescolar , Consenso , Cuidados Críticos/tendencias , Humanos , Lactante , Puntuaciones en la Disfunción de Órganos , Pediatría/métodos
7.
Pediatr Crit Care Med ; 21(2): 186-195, 2020 02.
Artículo en Inglés | MEDLINE | ID: mdl-32032264
8.
Pediatr Crit Care Med ; 21(2): e52-e106, 2020 02.
Artículo en Inglés | MEDLINE | ID: mdl-32032273

RESUMEN

OBJECTIVES: To develop evidence-based recommendations for clinicians caring for children (including infants, school-aged children, and adolescents) with septic shock and other sepsis-associated organ dysfunction. DESIGN: A panel of 49 international experts, representing 12 international organizations, as well as three methodologists and three public members was convened. Panel members assembled at key international meetings (for those panel members attending the conference), and a stand-alone meeting was held for all panel members in November 2018. A formal conflict-of-interest policy was developed at the onset of the process and enforced throughout. Teleconferences and electronic-based discussion among the chairs, co-chairs, methodologists, and group heads, as well as within subgroups, served as an integral part of the guideline development process. METHODS: The panel consisted of six subgroups: recognition and management of infection, hemodynamics and resuscitation, ventilation, endocrine and metabolic therapies, adjunctive therapies, and research priorities. We conducted a systematic review for each Population, Intervention, Control, and Outcomes question to identify the best available evidence, statistically summarized the evidence, and then assessed the quality of evidence using the Grading of Recommendations Assessment, Development, and Evaluation approach. We used the evidence-to-decision framework to formulate recommendations as strong or weak, or as a best practice statement. In addition, "in our practice" statements were included when evidence was inconclusive to issue a recommendation, but the panel felt that some guidance based on practice patterns may be appropriate. RESULTS: The panel provided 77 statements on the management and resuscitation of children with septic shock and other sepsis-associated organ dysfunction. Overall, six were strong recommendations, 52 were weak recommendations, and nine were best-practice statements. For 13 questions, no recommendations could be made; but, for 10 of these, "in our practice" statements were provided. In addition, 49 research priorities were identified. CONCLUSIONS: A large cohort of international experts was able to achieve consensus regarding many recommendations for the best care of children with sepsis, acknowledging that most aspects of care had relatively low quality of evidence resulting in the frequent issuance of weak recommendations. Despite this challenge, these recommendations regarding the management of children with septic shock and other sepsis-associated organ dysfunction provide a foundation for consistent care to improve outcomes and inform future research.


Asunto(s)
Insuficiencia Multiorgánica/terapia , Pediatría/normas , Sepsis/terapia , Choque Séptico/terapia , Adolescente , Antibacterianos/uso terapéutico , Niño , Preescolar , Medicina Basada en la Evidencia , Fluidoterapia/métodos , Hemodinámica , Humanos , Lactante , Recién Nacido , Ácido Láctico/sangre , Insuficiencia Multiorgánica/diagnóstico , Insuficiencia Multiorgánica/etiología , Respiración Artificial/métodos , Resucitación/métodos , Sepsis/complicaciones , Sepsis/diagnóstico , Choque Séptico/diagnóstico , Vasoconstrictores/uso terapéutico
9.
Microbiol Resour Announc ; 8(19)2019 May 09.
Artículo en Inglés | MEDLINE | ID: mdl-31072887

RESUMEN

Serratia marcescens is an opportunistic human pathogen that is known to cause hospital-acquired respiratory and urinary tract infections. Here, we announce the complete genome sequence and the features of S. marcescens phage Serbin.

10.
Abdom Radiol (NY) ; 44(6): 2089-2103, 2019 06.
Artículo en Inglés | MEDLINE | ID: mdl-30809694

RESUMEN

Although the small intestine accounts for over 90% of the surface area of the alimentary tract, tumors of the small intestine represent less than 5% of all gastrointestinal tract neoplasms. Common small bowel tumors typically are well evaluated with cross-sectional imaging modalities such as CT and MR, but accurate identification and differentiation can be challenging. Differentiating normal bowel from abnormal tumor depends on imaging modality and the particular technique. While endoscopic evaluation is typically more sensitive for the detection of intraluminal tumors that can be reached, CT and MR, as well as select nuclear medicine studies, remain superior for evaluating extraluminal neoplasms. Understanding the imaging characteristics of typical benign and malignant small bowel tumors is critical, because of overlapping features and associated secondary complications.


Asunto(s)
Neoplasias Intestinales/diagnóstico por imagen , Intestino Delgado , Imagen Multimodal , Medios de Contraste , Diagnóstico Diferencial , Humanos , Sensibilidad y Especificidad
11.
J Thorac Imaging ; 34(1): 56-64, 2019 Jan.
Artículo en Inglés | MEDLINE | ID: mdl-30376479

RESUMEN

Proximal interruption of the pulmonary artery (PIPA) is an uncommon developmental anomaly resulting in underdevelopment of the proximal portion of the pulmonary artery with preservation of the intrapulmonary segments. Clinical presentation ranges between an asymptomatic incidental finding to massive hemoptysis. When findings suggestive of PIPA are present radiographically, the diagnosis of PIPA can be definitively diagnosed with computed tomography or magnetic resonance pulmonary angiography. Other imaging modalities, such as nuclear perfusion scan and catheter angiography can help in the diagnosis.


Asunto(s)
Diagnóstico por Imagen/métodos , Arteria Pulmonar/anomalías , Arteria Pulmonar/diagnóstico por imagen , Diagnóstico Diferencial , Humanos
12.
J Pharm Pract ; 31(3): 353-360, 2018 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-28629302

RESUMEN

BACKGROUND: "Pimping" is an informal teaching technique that is widely used in medical education. Pimping is characterized by questioning the learner with the intent of reinforcing clinical hierarchy. To date, there are no studies of the use of pimping in pharmacy education. OBJECTIVES: To describe the use of pimping as a teaching method in pharmacy education and to compare student and faculty perceptions of this technique. METHODS: Faculty and fourth-year PharmD (P4) students from 2 colleges of pharmacy were invited to participate in a survey about experiences and perceptions of pimping. Faculty and P4 surveys each contained up to 17 items to assess personal experiences, utilization, perceived risks and benefits, and preferences regarding the role of the technique in pharmacy education. RESULTS: The response rate was 49.5% (159 of 321). Of faculty, 74.1% reported they had been pimped in their training, but less than half (45.8%) use pimping themselves. Similarly, 73.7% of students reported that they had been pimped at some time in their pharmacy education. Students nearly equally viewed their experiences as positive (35.3%) versus negative (38.2%). Responses were similar between faculty and students recommending that the method should be avoided entirely ( P = .259), used sparingly ( P = .072), or used consistently ( P = .309). Perceived benefits and risks of pimping were similar between faculty and students, but there were many differences in rationales offered by faculty versus students' perceived rationales. CONCLUSION: Pimping is common in pharmacy education and its use is controversial. The perceived rationale for use of pimping differs, which may undermine student/faculty relationships.


Asunto(s)
Educación en Farmacia/métodos , Docentes de Farmacia , Entrenamiento Simulado/métodos , Estudiantes de Farmacia , Encuestas y Cuestionarios , Adulto , Anciano , Docentes de Farmacia/psicología , Femenino , Humanos , Masculino , Persona de Mediana Edad , Estudiantes de Farmacia/psicología
14.
Crit Care Med ; 45(6): 1061-1093, 2017 06.
Artículo en Inglés | MEDLINE | ID: mdl-28509730

RESUMEN

OBJECTIVES: The American College of Critical Care Medicine provided 2002 and 2007 guidelines for hemodynamic support of newborn and pediatric septic shock. Provide the 2014 update of the 2007 American College of Critical Care Medicine "Clinical Guidelines for Hemodynamic Support of Neonates and Children with Septic Shock." DESIGN: Society of Critical Care Medicine members were identified from general solicitation at Society of Critical Care Medicine Educational and Scientific Symposia (2006-2014). The PubMed/Medline/Embase literature (2006-14) was searched by the Society of Critical Care Medicine librarian using the keywords: sepsis, septicemia, septic shock, endotoxemia, persistent pulmonary hypertension, nitric oxide, extracorporeal membrane oxygenation, and American College of Critical Care Medicine guidelines in the newborn and pediatric age groups. MEASUREMENTS AND MAIN RESULTS: The 2002 and 2007 guidelines were widely disseminated, translated into Spanish and Portuguese, and incorporated into Society of Critical Care Medicine and American Heart Association/Pediatric Advanced Life Support sanctioned recommendations. The review of new literature highlights two tertiary pediatric centers that implemented quality improvement initiatives to improve early septic shock recognition and first-hour compliance to these guidelines. Improved compliance reduced hospital mortality from 4% to 2%. Analysis of Global Sepsis Initiative data in resource rich developed and developing nations further showed improved hospital mortality with compliance to first-hour and stabilization guideline recommendations. CONCLUSIONS: The major new recommendation in the 2014 update is consideration of institution-specific use of 1) a "recognition bundle" containing a trigger tool for rapid identification of patients with septic shock, 2) a "resuscitation and stabilization bundle" to help adherence to best practice principles, and 3) a "performance bundle" to identify and overcome perceived barriers to the pursuit of best practice principles.


Asunto(s)
Cuidados Críticos/normas , Paquetes de Atención al Paciente/normas , Guías de Práctica Clínica como Asunto/normas , Choque Séptico/terapia , Anestesia/métodos , Anestesia/normas , Biomarcadores , Fármacos Cardiovasculares/administración & dosificación , Niño , Oxigenación por Membrana Extracorpórea/métodos , Fluidoterapia/métodos , Fluidoterapia/normas , Hemodinámica , Mortalidad Hospitalaria , Humanos , Recién Nacido , Monitoreo Fisiológico , Resucitación/normas , Choque Séptico/diagnóstico , Choque Séptico/mortalidad , Factores de Tiempo , Estados Unidos
16.
J Pediatr ; 167(6): 1301-5.e1, 2015 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-26411864

RESUMEN

OBJECTIVE: To investigate the impact of an early emergency department (ED) protocol-driven resuscitation (septic shock protocol [SSP]) on the incidence of acute kidney injury (AKI). STUDY DESIGN: This was a retrospective pediatric cohort with clinical sepsis admitted to the pediatric intensive care unit (PICU) from the ED before (2009, PRE) and after (2010, POST) implementation of the SSP. AKI was defined by pRIFLE (pediatric version of the Risk of renal dysfunction; Injury to kidney; Failure of kidney function; Loss of kidney function, End-stage renal disease creatinine criteria). RESULTS: A total of 202 patients (PRE, n = 98; POST, n = 104) were included (53% male, mean age 7.7 ± 5.6 years, mean Pediatric Logistic Organ Dysfunction [PELOD] 8.9 ± 12.7, mean Pediatric Risk of Mortality score 5.3 ± 13.9). There were no differences in demographics or illness severity between the PRE and POST groups. POST was associated with decreased AKI (54% vs 29%, P < .001), renal-replacement therapy (4 vs 0, P = .04), PICU, and hospital lengths of stay (LOS) (1.9 ± 2.3 vs 4.5 ± 7.6, P < .01; 6.3 ± 5.1 vs 15.3 ± 16.9, P < .001, respectively), and mortality (10% vs 3%, P = .037). The SSP was independently associated with decreased AKI when we controlled for age, sex, and PELOD (OR 0.27, CI 0.13-0.56). In multivariate analyses, the SSP was independently associated with shorter PICU and hospital LOS when we controlled for AKI and PELOD (P = .02, P < .001, respectively). CONCLUSION: A protocol-driven implementation of a resuscitation bundle in the pediatric ED decreased AKI and need for renal-replacement therapy, as well as PICU and hospital LOS and mortality.


Asunto(s)
Lesión Renal Aguda/complicaciones , Resucitación/métodos , Choque/terapia , Lesión Renal Aguda/epidemiología , Niño , Progresión de la Enfermedad , Femenino , Estudios de Seguimiento , Mortalidad Hospitalaria/tendencias , Humanos , Incidencia , Masculino , Estudios Retrospectivos , Factores de Riesgo , Índice de Severidad de la Enfermedad , Choque/etiología , Choque/mortalidad , Texas/epidemiología , Resultado del Tratamiento
17.
J Healthc Qual ; 37(5): 267-76, 2015.
Artículo en Inglés | MEDLINE | ID: mdl-24180562

RESUMEN

Sign-out of patient data at change of shifts is vulnerable to errors that impact patient safety. Although sign-outs are complex in intensive care units (ICU), a paucity of studies exists evaluating optimal ICU sign-out. Our prospective interventional study investigated the use of a standard verbal template in a Pediatric ICU to improve the sign-out process. We designed and validated a survey tool to measure 10 items of optimal sign-out. The survey and analysis of sign-out information exchanged was performed pre- and postintervention. Forty-eight clinicians participated, with a survey response rate of 88% and 81% in the pre- and postintervention phases, respectively. Seventy-nine percent clinicians identified the need for sign-out improvement. Clinician satisfaction with sign-out increased postintervention (preintervention survey scores: 3.26 (CI: 3.09-3.43), postintervention 3.9 (CI: 3.76-4.04) [p < .01]). Three scorers analyzed the verbal and written sign-out content with good inter-rater reliability. After the intervention, sign-out content revealed increased patient identification, background description, account of system-based clinical details [p = .001] and notation of clinical details, code status, and goals [p < .002]. Interruptions decreased [p = .04] without any change in sign-out duration [p = .86]. The standard verbal template improved clinician satisfaction with sign-out, augmented the amount of information transferred and decreased interruptions without increasing the duration of sign-out.


Asunto(s)
Continuidad de la Atención al Paciente/organización & administración , Continuidad de la Atención al Paciente/normas , Unidades de Cuidado Intensivo Pediátrico/organización & administración , Unidades de Cuidado Intensivo Pediátrico/normas , Errores Médicos/prevención & control , Centros Médicos Académicos , Niño , Humanos , Estudios Prospectivos , Garantía de la Calidad de Atención de Salud , Encuestas y Cuestionarios
18.
J Healthc Eng ; 6(4): 635-47, 2015.
Artículo en Inglés | MEDLINE | ID: mdl-27010831

RESUMEN

Engineering has been playing an important role in serving and advancing healthcare. The term "Healthcare Engineering" has been used by professional societies, universities, scientific authors, and the healthcare industry for decades. However, the definition of "Healthcare Engineering" remains ambiguous. The purpose of this position paper is to present a definition of Healthcare Engineering as an academic discipline, an area of research, a field of specialty, and a profession. Healthcare Engineering is defined in terms of what it is, who performs it, where it is performed, and how it is performed, including its purpose, scope, topics, synergy, education/training, contributions, and prospects.


Asunto(s)
Ingeniería Biomédica , Atención a la Salud , Ingeniería , Humanos
19.
J Appl Clin Med Phys ; 15(3): 54­62, 2013 05 08.
Artículo en Inglés | MEDLINE | ID: mdl-24892326

RESUMEN

The Contura brachytherapy applicator is a silicone balloon with five lumens in which a high-dose-rate brachytherapy source can traverse. Multilumen applicators, like the Contura, are used in accelerated partial breast irradiation (APBI) brachytherapy in instances where asymmetric dose distributions are desired; for example, when the applicator surface-to-skin thickness is small (< 7 mm). In these instances, the air outside the patient and the lung act as a poor scattering medium, scattering less dose back into the breast and affecting the dose distribution. The recent report by Task Group 186 of the American Association of Physicists in Medicine (AAPM) has outlined the importance of moving towards brachytherapy dose calculations using heterogeneity corrections. However, at this time, many commercial treatment planning systems do not correct for tissue heterogeneity, which can result in inaccuracies in the planned dose distribution. To quantify the deviation in the skin dose we utilize the dose modification factor (DMF), defined as the ratio of the dose rate at 1 cm beyond the applicator surface with homogenous medium, to the dose rate at 1 cm with heterogeneous medium. This investigation models the Contura applicator with the Monte Carlo N-Particle code version 5, and determines a DMF through simulation. Taking all geometrical considerations into account, an accurate model of the Contura balloon applicator was created in MCNP and used to run simulations. The dose modification factor was found to be only slightly dependent on whether the dose distribution was symmetric or asymmetric. These results indicate that the dose delivered to part of the PTV may be lower than the planned dose by up to 12%, and that these brachytherapy plans should be viewed with caution. In addition to studying the effects of backscatter, an evaluation was made regarding the capabilities of the Contura device to shape an asymmetric dose distribution. We compared these results to a previous study of a MammoSite ML and a SAVI device and found that the dose shaping capabilities of the Contura were quite similar to that of the MammoSite ML, but markedly inferior to the SAVI.


Asunto(s)
Braquiterapia/instrumentación , Neoplasias de la Mama/fisiopatología , Neoplasias de la Mama/radioterapia , Catéteres , Modelos Biológicos , Modelos Estadísticos , Planificación de la Radioterapia Asistida por Computador/métodos , Simulación por Computador , Diseño Asistido por Computadora , Diseño de Equipo , Análisis de Falla de Equipo , Humanos , Método de Montecarlo , Prótesis e Implantes , Radiometría/métodos , Dosificación Radioterapéutica , Dispersión de Radiación
20.
J Neurointerv Surg ; 5(6): 597-600, 2013 Nov.
Artículo en Inglés | MEDLINE | ID: mdl-23178224

RESUMEN

BACKGROUND: Our goal was to provide measurements of the posterior cerebral circulation using non-invasive imaging and advanced software analysis tools. METHODS: 100 consecutive patients aged ≥ 40 years (50 men and 50 women) who had undergone CT angiography (CTA) but had no vascular abnormality were analyzed. Specific software was used to make vessel measurements along the center line. The length of the intracranial vertebral artery (VA), the basilar artery (BA) and the distance from the mid-basilar artery to the posterior cerebral artery (mBA-PCA) was recorded. Vessel diameter was measured at the proximal and distal ends of these vessel lengths. Vessel taper was calculated as the change in diameter in millimeters per centimeter of length. RESULTS: The mean lengths of the intracranial VA, the BA and the mBA-PCA were 40 ± 10.6 mm, 27.3 ± 5.7 mm and 25.6 ± 4.3 mm, respectively. The proximal and distal diameters were 3.9 ± 0.8 mm and 2.8 ± 0.6 mm for the VA and 3.6 ± 0.6 mm and 3.1 ± 0.5 mm for the BA, respectively. The mean mid-BA diameter and the proximal PCA diameter were 3.2 ± 0.5 mm and 2.2 ± 0.4 mm, respectively. There was a significant increase in arterial caliber in patients aged ≥ 60 years compared with those aged 40-59 years. Men also tended to have longer vessels with a larger diameter than women. CONCLUSIONS: Advanced software and non-invasive imaging can be used to perform accurate vessel analysis. The posterior circulation measurements showed an increase in arterial caliber with age. This baseline information may be useful in planning neurovascular procedures and endovascular device development.


Asunto(s)
Angiografía Cerebral/métodos , Circulación Cerebrovascular/fisiología , Tomografía Computarizada por Rayos X/métodos , Adulto , Anciano , Arteria Basilar/anatomía & histología , Femenino , Humanos , Procesamiento de Imagen Asistido por Computador , Masculino , Persona de Mediana Edad , Arteria Cerebral Posterior/anatomía & histología , Estudios Retrospectivos , Tamaño de la Muestra , Caracteres Sexuales , Arteria Vertebral/anatomía & histología
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