Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 15 de 15
Filtrar
1.
Health Promot Int ; 39(1)2024 Feb 01.
Artigo em Inglês | MEDLINE | ID: mdl-38386901

RESUMO

Medication guides (MGs) provide patients with important information about certain prescription drugs to help them take these drugs safely. We surveyed US residents about their perceptions of MG readability and understandability. We randomly sampled 5204 US residents (age 18+) from Ipsos's KnowledgePanel to complete a two-part survey. Only respondents who reported receiving an MG with their prescription drugs (n = 3852) completed part 2, which included two key items: How easy to [(1)read/(2)understand] are the MGs that you have received from a pharmacy along with your prescription medicines? (1 = Very easy, 5 = Very difficult; reverse-coded). Health literacy (HL) and demographic data were also collected. After weighting our data, we found that 85% of respondents who reported receiving an MG perceived this information as 'very easy' (27.3%), 'somewhat easy' (28.3%) or 'about average' (29.3%) to read. Eighty-seven percent of respondents who reported receiving an MG perceived it as 'very easy' (27.6%), 'somewhat easy' (30.2%) or 'about average' (29.5%) to understand. ANOVAs revealed higher average perceived MG reading and comprehension ease scores among respondents presumed to have adequate versus inadequate HL (ps ≤ 0.0006). Younger or less-educated respondents and non-Hispanic Blacks perceived MGs as easier to read and understand, on average, than their counterparts (ps ≤ 0.0001). Many of these relationships remained intact in models predicting perceived MG reading and comprehension ease (ps ≤ 0.001). Adjusted R2 values across models were small, however (≤0.06). Our findings suggest most US residents (18+) who received MGs perceived them to be 'about average' to 'very easy' to read and understand.


Assuntos
Letramento em Saúde , Leitura , Adulto , Humanos , Adolescente , Compreensão , Inquéritos e Questionários
2.
Open Forum Infect Dis ; 9(7): ofac231, 2022 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-35836748

RESUMO

Background: The prospective identification of patients at high risk for hospital-acquired/ventilator-associated bacterial pneumonia may improve clinical trial feasibility and foster antibacterial development. In a prior study conducted in the United States, clinical criteria were used to prospectively identify these patients; however, these criteria have not been applied in a European population. Methods: Adults considered high risk for pneumonia (treatment with ventilation or high levels of supplemental oxygen) in the intensive care units of 7 European hospitals were prospectively enrolled from June 12 to December 27, 2017. We estimated the proportion of high-risk patients developing pneumonia according to US Food and Drug Administration guidance and a subset potentially eligible for antibacterial trial enrollment. We compared patient characteristics, treatment exposures, and pneumonia incidence in a European cohort and a previously described US cohort. Results: Of 888 high-risk patients, 211/888 (24%) were treated for possible pneumonia, and 150/888 (17%) met the Food and Drug Administration definition for hospital-acquired/ventilator-associated bacterial pneumonia. A higher proportion of European patients treated for possible pneumonia met the pneumonia definition (150/211 [71%] vs 537/1464 [37%]; P < .001). Among patients developing pneumonia, a higher proportion of European patients met antibacterial trial eligibility criteria (124/150 [83%] vs 371/537 [69%]; P < .001). Conclusions: Clinical criteria prospectively identified high-risk patients with high rates of pneumonia in the European cohort. Despite higher rates of established risk factors and incident pneumonia, European patients were significantly less likely to receive antibiotics for possible pneumonia than US patients. Different treatment practices may contribute to lower rates of antibacterial trial enrollment in the United States.

3.
Ther Innov Regul Sci ; 55(5): 918-925, 2021 09.
Artigo em Inglês | MEDLINE | ID: mdl-33970464

RESUMO

BACKGROUND: A medication guide (MG) is a form of FDA-approved labeling that provides patients with information about certain prescribed drugs so that patients can use these drugs safely and effectively. Given ongoing efforts by FDA and industry to continuously improve MG content and format, we hypothesized that more recently approved MGs for new molecular entities (NMEs) would be shorter and more readable compared to NME MGs approved earlier. METHODS: We analyzed 53 NME MGs that were either approved in 2011 (n = 16), 2013 (n = 9), 2015 (n = 12), or 2017 (n = 16) to determine whether MG page length, word count, and readability scores differed by year. Readability was estimated by Flesch Reading Ease, Flesch-Kincaid Grade Level (FKGL), Fry graph (FRY), and Gunning's Fog Index (FOG) scores. RESULTS: Mean page length was significantly lower in 2017 than in 2011 and 2013 (ps < .0001). Mean FKGL scores reflected sentences and words found in 8th grade textbooks, but mean FOG and FRY scores were consistent with sentences and words found in 10th and 11th grade textbooks. CONCLUSIONS: Although more recent NME MGs were shorter than older NME MGs, additional research is warranted to determine whether shorter MGs lead to improved readability. Developers choosing to estimate MG readability with equations should consider using multiple readability formulas and weigh the strengths and weaknesses of this approach. Using validated tools to more comprehensively assess MG readability should also be considered.


Assuntos
Letramento em Saúde , Preparações Farmacêuticas , Compreensão , Escolaridade , Humanos , Leitura
4.
Chest ; 158(6): 2370-2380, 2020 12.
Artigo em Inglês | MEDLINE | ID: mdl-32615191

RESUMO

BACKGROUND: Pneumonia is the leading infection-related cause of death. The use of simple clinical criteria and contemporary epidemiology to identify patients at high risk of nosocomial pneumonia should enhance prevention efforts and facilitate development of new treatments in clinical trials. RESEARCH QUESTION: What are the clinical criteria and contemporary epidemiology trends that are helpful in the identification of patients at high risk of nosocomial pneumonia? STUDY DESIGN AND METHODS: Within the ICUs of 28 US hospitals, we conducted a prospective cohort study among adults who had been hospitalized >48 hours and were considered high risk for pneumonia (defined as treatment with invasive or noninvasive ventilatory support or high levels of supplemental oxygen). We estimated the proportion of high-risk patients who experienced the development of nosocomial pneumonia. Using multivariable logistic regression, we identified patient characteristics and treatment exposures that are associated with increased risk of pneumonia development during the ICU admission. RESULTS: Between February 6, 2016, and October 7, 2016, 4,613 high-risk patients were enrolled. Among 1,464 high-risk patients (32%) who were treated for possible nosocomial pneumonia, 537 (37%) met the study pneumonia definition. Among high-risk patients, a multivariable logistic model was developed to identify key patient characteristics and treatment exposures that are associated with increased risk of nosocomial pneumonia development (c-statistic, 0.709; 95% CI, 0.686-0.731). Key factors associated with increased odds of nosocomial pneumonia included an admission diagnosis of trauma or cerebrovascular accident, receipt of enteral nutrition, documented aspiration risk, and receipt of systemic antibacterials within the preceding 90 days. INTERPRETATION: Treatment for nosocomial pneumonia is common among patients in the ICU who are receiving high levels of respiratory support, yet more than one-half of patients who are treated do not fulfill standard diagnostic criteria for pneumonia. Application of simple clinical criteria may improve the feasibility of clinical trials of pneumonia prevention and treatment by facilitating prospective identification of patients at highest risk.


Assuntos
Cuidados Críticos , Procedimentos Clínicos/normas , Infecção Hospitalar , Unidades de Terapia Intensiva/estatística & dados numéricos , Pneumonia , Medição de Risco , Manuseio das Vias Aéreas/efeitos adversos , Manuseio das Vias Aéreas/métodos , Manuseio das Vias Aéreas/estatística & dados numéricos , Cuidados Críticos/métodos , Cuidados Críticos/organização & administração , Cuidados Críticos/normas , Infecção Hospitalar/diagnóstico , Infecção Hospitalar/epidemiologia , Infecção Hospitalar/prevenção & controle , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Seleção de Pacientes , Pneumonia/diagnóstico , Pneumonia/epidemiologia , Pneumonia/etiologia , Pneumonia/terapia , Prognóstico , Estudos Prospectivos , Melhoria de Qualidade , Medição de Risco/métodos , Medição de Risco/tendências , Fatores de Risco , Estados Unidos/epidemiologia
5.
JAMA Netw Open ; 3(5): e205435, 2020 05 01.
Artigo em Inglês | MEDLINE | ID: mdl-32442291

RESUMO

Importance: Information to be included in advance informed consent forms for health care-associated pneumonia treatment trials remains to be determined. Objective: To identify and determine how to describe information to be included in an advance informed consent form for an early-enrollment noninferiority hospital-acquired and/or ventilator-associated bacterial pneumonia (HABP/VABP) clinical trial. Design, Setting, and Participants: A Delphi consensus process with stakeholders in HABP/VABP clinical trials was conducted using qualitative semistructured telephone interviews from June to August 2016, followed by 2 online surveys, the first from April to May 2017, and the second from September to October 2017. All stakeholders who participated in the interview were invited to participate in the first survey. Stakeholders who participated in the first survey were invited to participate in the second survey. Stakeholders were patients at risk of pneumonia, caregivers, representatives of institutional review boards, investigators, and study coordinators. Main Outcomes and Measures: Description and consensus of information to be included in advance informed consent forms for early enrollment in noninferiority HABP/VABP clinical trials. Results: Suggestions from 52 stakeholders about what key informed consent concepts to include and how to explain them were used to create 3 categories to be included in an advance consent form: (1) reassurances on patient health and treatment, (2) rationale for advance consent and early enrollment, and (3) an explanation of noninferiority. At the end of the Delphi process, at least 80% consensus was reached among the 40 stakeholders who participated in the second online survey on each of the statements to include in the proposed consent text. Throughout the process, however, describing and reaching consensus on statements about noninferiority was more problematic than the other categories. Conclusions and Relevance: The stakeholders endorsed consent language to be used in combination with a strategy for enrolling patients at highest risk for pneumonia before infection onset. Data-driven consent language may help potential participants make informed decisions about their involvement in clinical research and improve enrollment rates, which are necessary to evaluate new treatments and improve patient care. The proposed consent language may be adapted for other trials using an early enrollment strategy and for noninferiority trials.


Assuntos
Ensaios Clínicos como Assunto/ética , Pneumonia Associada a Assistência à Saúde/terapia , Consentimento Livre e Esclarecido/normas , Adulto , Idoso , Ensaios Clínicos como Assunto/métodos , Termos de Consentimento/normas , Técnica Delphi , Feminino , Humanos , Idioma , Masculino , Pessoa de Meia-Idade , Pneumonia Associada à Ventilação Mecânica/terapia , Participação dos Interessados
6.
Dement Geriatr Cogn Disord ; 49(6): 557-564, 2020.
Artigo em Inglês | MEDLINE | ID: mdl-33486486

RESUMO

BACKGROUND: Compared to Western populations, familial frontotemporal lobar degeneration (FTLD) is rare among Asians. Progranulin (GRN) gene mutation, which is a major cause of FTLD, is likewise rare. We present a family with FTLD from the Philippines with an autosomal dominant pattern of inheritance and GRN mutation and briefly review reports of GRN mutations in Asia. CASE PRESENTATION: The proband is 66 years old with progressive nonfluent aphasia (PNFA)-corticobasal syndrome . We assessed 3 generations of her pedigree and found 11 affected relatives with heterogenous phenotypes, usually behavioral variant frontotemporal dementia (FTD) and PNFA. Neuroimaging showed atrophy and hypometabolism consistent with FTD syndromes. White matter hyperintensities were seen in affected members even in the absence of vascular risk factors. A GRN mutation R110X was found in 6 members, 3 with symptoms and 3 were asymptomatic. Plasma GRN was low (<112 ng/mL) in all mutation carriers. No mutations were found in microtubule-associated protein tau, APP, PSEN1, and PSEN2 genes, and all were APOE3. CONCLUSION: This is the first Filipino family with autosomal dominant FTD documented with GRN mutation. Identifying families and cohorts would contribute to therapeutic developments in an area with FTD-GRN.


Assuntos
Degeneração Lobar Frontotemporal/genética , Mutação , Progranulinas/genética , Idoso , Feminino , Demência Frontotemporal/genética , Humanos , Filipinas
7.
JAMA Netw Open ; 1(8): e185816, 2018 12 07.
Artigo em Inglês | MEDLINE | ID: mdl-30646295

RESUMO

Importance: Better treatment options are needed in life-threatening infections, including health care-associated pneumonia. Enrolling patients in antibacterial clinical trials before diagnosis may circumvent existing time-to-enrollment constraints. However, the acceptability of an early enrollment strategy using advance consent is unknown. Objective: To assess the perceived acceptability of an early enrollment strategy for enrolling patients in an antibacterial clinical trial before a pneumonia diagnosis. Design, Setting, and Participants: This qualitative, descriptive study used semistructured telephone interviews. Framed within a planned noninferiority pneumonia antibiotic trial, an early enrollment strategy was described and perceptions were assessed. Using this strategy, patients give consent to enroll before developing pneumonia, to be monitored by study staff, and to be randomly assigned a study antibiotic if pneumonia develops. All interviews were audiorecorded, transcribed verbatim, and analyzed using applied thematic analysis. Fifty-two key stakeholders from across the United States, including 18 patients at risk of pneumonia, 12 caregivers, 10 representatives of institutional review boards, 7 investigators, and 5 study coordinators, were interviewed from June 20 to August 19, 2016. Main Outcomes and Measures: Perceived acceptability of the early enrollment strategy. Results: Among the 52 stakeholders interviewed (ages 29-75 years; 14 women), patients and caregivers expressed no concerns about patients being approached about participation before developing pneumonia; however, some patients may experience anxiety on learning about their risk for pneumonia. No concerns with study staff accessing patients' medical records were expressed. The clarity of consent information was important for understanding the study rather than having the condition under investigation. Among patients, caregivers, and institutional review board representatives, preferences varied regarding opt-out and precedent autonomy procedures. Nearly all patients would be willing to join a trial using the early enrollment strategy and caregivers would be willing to provide proxy consent. Institutional review board representatives were supportive of the strategy and made recommendations for the study protocol, primarily around informed consent. Investigators and study coordinators believed the strategy would not be burdensome and offered suggestions to ensure its feasibility. Conclusion and Relevance: Results of the study suggest that the early enrollment strategy is acceptable. Future research should evaluate whether the strategy improves enrollment rates in registrational pneumonia trials and in trials of other acute infection syndromes with narrow enrollment windows and/or patients with transient decisional incapacity.


Assuntos
Pneumonia Associada a Assistência à Saúde/tratamento farmacológico , Consentimento Livre e Esclarecido/psicologia , Sujeitos da Pesquisa/psicologia , Adulto , Idoso , Antibacterianos/uso terapêutico , Pesquisa Biomédica , Tomada de Decisões , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Pesquisa Qualitativa , Projetos de Pesquisa , Fatores de Tempo
8.
Clin Infect Dis ; 63 Suppl 2: S39-45, 2016 Aug 15.
Artigo em Inglês | MEDLINE | ID: mdl-27481952

RESUMO

BACKGROUND: Resistant bacteria are one of the leading causes of hospital-acquired/ventilator-associated bacterial pneumonia (HABP/VABP). HABP/VABP trials are complex and difficult to conduct due to the large number of medical procedures, adverse events, and concomitant medications involved. Differences in the legislative frameworks between different regions of the world may also lead to excessive data collection. The Clinical Trials Transformation Initiative (CTTI) seeks to advance antibacterial drug development (ABDD) by streamlining clinical trials to improve efficiency and feasibility while maintaining ethical rigor, patient safety, information value, and scientific validity. METHODS: In 2013, CTTI engaged a multidisciplinary group of experts to discuss challenges impeding the conduct of HABP/VABP trials. Separate workstreams identified challenges associated with current data collection processes. Experts defined "data collection" as the act of capturing and reporting certain data on the case report form as opposed to recording of data as part of routine clinical care. The ABDD Project Team developed strategies for streamlining safety data collection in HABP/VABP trials using a Quality by Design approach. RESULTS: Current safety data collection processes in HABP/VABP trials often include extraneous information. More targeted strategies for safety data collection in HABP/VABP trials will rely on optimal protocol design and prespecification of which safety data are essential to satisfy regulatory reporting requirements. CONCLUSIONS: A consensus and a cultural change in clinical trial design and conduct, which involve recognition of the need for more efficient data collection, are urgently needed to advance ABDD and to improve HABP/VABP trials in particular.


Assuntos
Antibacterianos/uso terapêutico , Ensaios Clínicos como Assunto/métodos , Coleta de Dados/métodos , Pneumonia Bacteriana/tratamento farmacológico , Pneumonia Associada à Ventilação Mecânica/tratamento farmacológico , Parcerias Público-Privadas , Humanos , Segurança do Paciente , Resultado do Tratamento , Estados Unidos
9.
Clin Infect Dis ; 63 Suppl 2: S29-36, 2016 Aug 15.
Artigo em Inglês | MEDLINE | ID: mdl-27481950

RESUMO

BACKGROUND: The etiology of hospital-acquired or ventilator-associated bacterial pneumonia (HABP/VABP) is often multidrug-resistant infections. The evaluation of new antibacterial drugs for efficacy in this population is important, as many antibacterial drugs have demonstrated limitations when studied in this population. HABP/VABP trials are expensive and challenging to conduct due to protocol complexity and low patient enrollment, among other factors. The Clinical Trials Transformation Initiative (CTTI) seeks to advance antibacterial drug development by streamlining HABP/VABP clinical trials to improve efficiency and feasibility while maintaining ethical rigor, patient safety, information value, and scientific validity. METHODS: In 2013, CTTI engaged a multidisciplinary group of experts to discuss challenges impeding the conduct of HABP/VABP trials. Separate workstreams identified challenges associated with HABP/VABP protocol complexity. The Project Team developed potential solutions to streamline HABP/VABP trials using a Quality by Design approach. RESULTS: CTTI recommendations focus on 4 key areas to improve HABP/VABP trials: informed consent processes/practices, protocol design, choice of an institutional review board (IRB), and trial outcomes. Informed consent processes should include legally authorized representatives. Protocol design decisions should focus on eligibility criteria, prestudy antibacterial therapy considerations, use of new diagnostics, and sample size. CTTI recommends that sponsors use a central IRB and discuss trial endpoints with regulators, including defining a clinical failure and evaluating the impact of concomitant antibacterial drugs. CONCLUSIONS: Streamlining HABP/VABP trials by addressing key protocol elements can improve trial startup and patient recruitment/retention, reduce trial complexity and costs, and ensure patient safety while advancing antibacterial drug development.


Assuntos
Antibacterianos/uso terapêutico , Ensaios Clínicos como Assunto/métodos , Pneumonia Bacteriana/tratamento farmacológico , Pneumonia Associada à Ventilação Mecânica/tratamento farmacológico , Parcerias Público-Privadas , Avaliação de Medicamentos , Indústria Farmacêutica , Humanos , Segurança do Paciente , Resultado do Tratamento , Estados Unidos , United States Food and Drug Administration , Universidades
10.
BMJ Open ; 6(11): e013561, 2016 11 10.
Artigo em Inglês | MEDLINE | ID: mdl-28186948

RESUMO

OBJECTIVES: To explore patient, caregiver and physician perceptions and attitudes regarding the balance of benefit and risk in using antibacterial drugs developed through streamlined development processes. DESIGN: Semistructured focus groups and in-depth interviews were conducted to elicit perceptions and attitudes about the use of antibacterial drugs to treat multidrug-resistant infections. Participants were given background information about antibiotic resistance, streamlined drug development programmes and FDA drug approval processes. Audio recordings of focus groups/interviews were reviewed and quotes excerpted and categorised to identify key themes. PARTICIPANTS: Two primary stakeholder groups were engaged: one comprising caregivers, healthy persons and patients who had recovered from or were at risk of resistant infection (N=67; 11 focus groups); and one comprising physicians who treat resistant infections (N=23). RESULTS: Responses from focus groups/interviews indicated widespread awareness among patients/caregivers and physicians of the seriousness of the problem of antibacterial resistance. Both groups were willing to accept a degree of uncertainty regarding the balance of risk and benefit in a new therapy where a serious unmet need exists, but also expressed a desire for rigorous monitoring and rapid, transparent reporting of safety/effectiveness data. Both groups wanted to ensure that >1 physician had input on whether to treat patients with antibiotics developed through a streamlined process. Some patients/caregivers unfamiliar with exigencies of critical care suggested a relatively large multidisciplinary team, while physicians believed individual expert consultations would be preferable. Both groups agreed that careful oversight and stewardship of antibacterial drugs are needed to ensure patient safety, preserve efficacy and prevent abuse. CONCLUSIONS: Groups comprising patients/caregivers and physicians were aware of serious issues posed by resistant infections and the lack of effective antibacterial drug therapies and shared a consensus that streamlined development programmes represent a necessary response to the resistance crisis, but one that requires enhanced safeguards and risk communication.


Assuntos
Antibacterianos/uso terapêutico , Atitude do Pessoal de Saúde , Farmacorresistência Bacteriana , Conhecimentos, Atitudes e Prática em Saúde , Cuidadores , Comunicação , Grupos Focais , Humanos , Pacientes , Médicos , Pesquisa Qualitativa , Fatores de Risco , Estados Unidos
11.
J Nucl Med ; 56(9): 1338-44, 2015 Sep.
Artigo em Inglês | MEDLINE | ID: mdl-26229148

RESUMO

UNLABELLED: We aimed to assess the additional value of SPECT/CT over planar lymphoscintigraphy (PI) in sentinel node (SN) detection in malignancies with different lymphatic drainage such as breast cancer, melanoma, and pelvic tumors. METHODS: From 2010 to 2013, 1,508 patients were recruited in a multicenter study: 1,182 breast cancer, 262 melanoma, and 64 pelvic malignancies (prostate, cervix, penis, vulva). PI was followed by SPECT/CT 1-3 h after injection of (99m)Tc-colloid particles. Surgery was performed the same or next day. RESULTS: Significantly more SNs were detected by SPECT/CT for breast cancer (2,165 vs. 1,892), melanoma (602 vs. 532), and pelvic cancer (195 vs. 138), all P < 0.001. The drainage basin mismatch between PI and SPECT/CT was 16.5% for breast cancer, 11.1% for melanoma, and 51.6% for pelvic cancers. Surgical adjustment was 17% for breast cancer, 37% for melanoma, and 65.6% for pelvic cancer. CONCLUSION: SPECT/CT detected more SNs and changed the drainage territory, leading to surgical adjustments in a considerable number of patients in all malignancies studied but especially in the pelvic cancer group because of this group's deep lymphatic drainage. We recommend SPECT/CT in all breast cancer patients with no SN visualized on PI, all patients with melanoma of the head and neck or trunk, all patients with pelvic malignancies, and those breast cancer and melanoma patients with unexpected drainage on PI.


Assuntos
Linfonodos/diagnóstico por imagem , Imagem Multimodal/métodos , Neoplasias/diagnóstico , Tomografia Computadorizada de Emissão de Fóton Único/métodos , Tomografia Computadorizada por Raios X/métodos , Feminino , Humanos , Agências Internacionais , Metástase Linfática , Masculino , Pessoa de Meia-Idade , Cintilografia/métodos , Reprodutibilidade dos Testes , Sensibilidade e Especificidade , Biópsia de Linfonodo Sentinela
12.
Clin Nucl Med ; 33(1): 23-5, 2008 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-18097251

RESUMO

Detection of recurrent and metastatic thyroid cancer remains a considerable challenge in patients presenting with rising thyroglobulin levels but with negative I-131 whole body scintigraphy. Such is the case in this patient with follicular thyroid cancer in whom subsequent FDG PET scanning showed a solitary hypermetabolic cervical lesion. With definitive management and multidisciplinary approach in mind, radioguided surgical excision came into play through the use of Tc-99m sestamibi, leading to successful removal of the lesion. Histopathology, however, revealed a parathyroid adenoma. This highlights the importance of considering differential diagnoses in apparent cases of recurrence to avoid potential pitfalls.


Assuntos
Neoplasias das Paratireoides/diagnóstico por imagem , Neoplasias das Paratireoides/cirurgia , Tireoglobulina/sangue , Tomografia Computadorizada de Emissão , Diagnóstico Diferencial , Fluordesoxiglucose F18 , Humanos , Radioisótopos do Iodo , Masculino , Pessoa de Meia-Idade , Procedimentos Cirúrgicos Minimamente Invasivos , Compostos Radiofarmacêuticos , Tecnécio Tc 99m Sestamibi , Neoplasias da Glândula Tireoide/diagnóstico por imagem , Neoplasias da Glândula Tireoide/patologia , Imagem Corporal Total
13.
J Nucl Cardiol ; 9(5): 482-90, 2002.
Artigo em Inglês | MEDLINE | ID: mdl-12360128

RESUMO

BACKGROUND: Transient postischemic stunning (TIS) has been reported in images obtained (1/2) to 1 hour after stress with technetium 99m tracers but has not been investigated in images obtained shortly after stress with thallium 201. We also quantified the global extent and severity of TIS, which has not been done previously. METHODS AND RESULTS: We evaluated 82 patients with either treadmill or dobutamine stress Tl-201 myocardial perfusion imaging. Images were semiquantitatively examined with a 20-segment model. The extent and severity of myocardial ischemia and TIS were assessed by the summed difference score from the early and delayed scores of perfusion, wall motion (WM), and wall thickening (WT). The mean left ventricular ejection fraction (LVEF) was significantly lower in early images than in delayed images in patients with ischemia (P <.01), TIS by WM (P <.001), and TIS by WT (P <.001), and the LVEF difference was more significantly different as the summed difference score of perfusion, WM, or WT increased. No significant LVEF difference was seen in patients with ischemia who did not have TIS. CONCLUSIONS: In stress gated Tl-201 single photon emission computed tomography myocardial perfusion imaging, early TIS is frequently seen in patients with ischemia and is equivalently detected by WM and WT assessments. Significant exercise-induced transient left ventricular global dysfunction is associated with more severe and extensive ischemia and can be predicted by the measurement of the extent and severity of TIS from the same images.


Assuntos
Dobutamina , Imagem do Acúmulo Cardíaco de Comporta/métodos , Miocárdio Atordoado/diagnóstico por imagem , Miocárdio Atordoado/fisiopatologia , Tálio , Disfunção Ventricular Esquerda/fisiopatologia , Doença Aguda , Adulto , Idoso , Teste de Esforço , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Miocárdio Atordoado/complicações , Compostos Radiofarmacêuticos , Volume Sistólico , Disfunção Ventricular Esquerda/diagnóstico por imagem , Disfunção Ventricular Esquerda/etiologia
14.
Eur J Nucl Med Mol Imaging ; 29(8): 979-83, 2002 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-12173009

RESUMO

Prolonged and persistent myocardial stunning has recently been demonstrated using technetium-99m sestamibi gated single-photon emission tomography (SPET) myocardial perfusion imaging post exercise or pharmacological stress test. In this study, we investigated the early postischemic transient myocardial stunning on early and delayed poststress thallium-201 gated SPET myocardial perfusion imaging using segmental wall motion (WM) and wall thickening (WT) analysis. A total of 1,680 segments from 84 patients' studies (53 men and 31 women, mean age 60 years) were evaluated on both early and delayed thallium-201 gated SPET treadmill exercise (59) or dobutamine stress (25) myocardial perfusion imaging. Semiquantitative analysis of perfusion, WM and WT in all segments was performed by two observers. Segments were classified according to changes in WM and WT between early and delayed images into normal, fixed abnormality, or improved abnormality (transient stunning), and were further classified according to changes in perfusion into normal, fixed defects, or ischemic. There were significant correlations between perfusion and WM, perfusion and WT, and WM and WT segmental scores on both early and delayed images. Transient stunning was seen significantly ( P < 0.001) more often in ischemic segments than were normal or fixed perfusion defects using WM (58%) and WT (50%) assessments. There was also a significant correlation between the severity of ischemia and transient stunning with either WM ( P < 0.05) or WT ( P < 0.005) evaluation. Segmental myocardial contractility assessment from gated SPET (201)Tl myocardial perfusion imaging using WM and WT was comparable, and results correlated well with the myocardial perfusion assessment. Early transient myocardial stunning was frequently observed in ischemic segments and was related to the severity of myocardial ischemia.


Assuntos
Imagem do Acúmulo Cardíaco de Comporta , Coração/diagnóstico por imagem , Coração/fisiopatologia , Miocárdio Atordoado/diagnóstico por imagem , Miocárdio Atordoado/fisiopatologia , Tálio , Adulto , Idoso , Idoso de 80 Anos ou mais , Dobutamina , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Miocárdio Atordoado/induzido quimicamente , Miocárdio/patologia , Compostos Radiofarmacêuticos , Estatística como Assunto , Disfunção Ventricular Esquerda/diagnóstico por imagem
15.
Clin Positron Imaging ; 2(6): 301-309, 1999 Nov.
Artigo em Inglês | MEDLINE | ID: mdl-14516612

RESUMO

OBJECTIVE AND METHODS: This study was undertaken to find the role of fluorine-18-fluorodeoxyglucose (F18-FDG) in the diagnostic work-up of febrile Acquired Immune Deficiency Syndrome (AIDS) patients. Forty-seven (42 male and 5 female; mean age = 40.3 years) febrile patients with AIDS underwent imaging with F18-FDG by Dual Head Coincidence Imaging (DHCI). Findings were correlated with other imaging modalities.RESULTS: Our data show good sensitivity for scanning with F18-FDG by DHCI in determining the extent of Castleman's disease, lymphoma, Kaposi's sarcoma (KS), adenocarcinoma, and germ cell carcinoma. Various opportunistic infections also manifest with increased F18-FDG uptake.CONCLUSION: Total-body imaging can be done with F18-FDG with better resolution and a shorter procedure time compared to imaging with Gallium-67 (Ga-67). Furthermore, F18-FDG is more sensitive than Ga-67 for evaluating extent of involvement in various pathologies affecting AIDS patients. The new technology of DHCI is a good alternative for hospitals with no dedicated positron emission tomography (PET) scanner.

SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA