RESUMO
BACKGROUND: Implantable cardioverter-defibrillators (ICDs) improve outcomes in patients with heart failure (HF) with left ventricular ejection fraction (LVEF) ≤35%. Less is known about whether outcomes varied between the 2 noninvasive imaging modalities used to estimate LVEF-2-dimensional echocardiography (2DE) and multigated acquisition radionuclide ventriculography (MUGA)-which use different principles (geometric vs count-based, respectively). OBJECTIVE: The purpose of this study was to examine whether the effect of ICD on mortality in patients with HF and LVEF ≤35% varied on the basis of LVEF measured by 2DE or MUGA. METHODS: Of the 2521 patients with HF with LVEF ≤35% in the Sudden Cardiac Death in Heart Failure Trial, 1676 (66%) were randomized to either placebo or ICD, of whom 1386 (83%) had LVEF measured by 2DE (n = 971) or MUGA (n = 415). Hazard ratios (HRs) and 97.5% confidence intervals (CIs) for mortality associated with ICD were estimated overall, checking for interaction, and within the 2 imaging subgroups. RESULTS: Of the 1386 patients in the present analysis, all-cause mortality occurred in 23.1% (160 of 692) and 29.7% (206 of 694) of patients randomized to ICD or placebo, respectively (HR 0.77; 97.5% CI 0.61-0.97), which is consistent with that in 1676 patients in the original report. HRs (97.5% CIs) for all-cause mortality in the 2DE and MUGA subgroups were 0.79 (0.60-1.04) and 0.72 (0.46-1.11), respectively (P = .693 for interaction). Similar associations were observed for cardiac and arrhythmic mortalities. CONCLUSION: We found no evidence that in patients with HF and LVEF ≤35%, the effect of ICD on mortality varied by the noninvasive imaging method used to measure LVEF.
Assuntos
Desfibriladores Implantáveis , Insuficiência Cardíaca , Humanos , Função Ventricular Esquerda , Volume Sistólico , Desfibriladores Implantáveis/efeitos adversos , Modelos de Riscos Proporcionais , Morte Súbita Cardíaca/epidemiologia , Morte Súbita Cardíaca/etiologia , Morte Súbita Cardíaca/prevenção & controle , Insuficiência Cardíaca/diagnóstico por imagem , Insuficiência Cardíaca/terapiaRESUMO
"A quick glance at selected topics in this issue" aims to highlight contents of the Journal and provide a quick review to the readers.
RESUMO
"A quick glance at selected topics in this issue" aims to highlight contents of the Journal and provide a quick review to the readers.
Assuntos
Tomografia Computadorizada de Emissão de Fóton Único , HumanosRESUMO
"A quick glance at selected topics in this issue" aims to highlight contents of the Journal and provide a quick review to the readers.
Assuntos
Doença da Artéria Coronariana , Imagem de Perfusão do Miocárdio , Humanos , Tomografia Computadorizada de Emissão de Fóton ÚnicoRESUMO
"A quick glance at selected topics in this issue" aims to highlight contents of the Journal and provide a quick review to the readers.
Assuntos
Medicina Nuclear , HumanosRESUMO
We have shown that silent myocardial infarction (SMI) on 12-lead ECG is associated with increased cardiovascular disease (CVD) risk in patients awaiting renal transplantation (RT). In this study, we evaluated the prevalence of SMI in patients undergoing RT and their prognostic value after RT. MI was determined by automated analysis of ECG. SMI was defined as ECG evidence of MI without a history of clinical MI (CMI). The primary outcome was a composite of CVD death, non-fatal MI and coronary revascularization after RT. Of the 1189 patients who underwent RT, a 12-lead ECG was available in >99%. Of the entire cohort 6% had a history of CMI while 7% had SMI by ECG. During a median follow-up of 4.6 years, 147 (12%) experienced the primary outcome (8% CVD death, 4% MI, 4% coronary revascularization) and 12% died. Both SMI and CMI were associated with an increased risk of CVD events and all-cause deaths. In a multivariable adjusted Cox-regression model, both SMI (adjusted hazard ratio 2.03 [1.25-3.30], p = .004) and CMI (2.15 [1.24-3.74], p = .007) were independently associated with the primary outcome. SMI detected by ECG prior to RT is associated with increased risk of CVD events after RT.
Assuntos
Transplante de Rim , Infarto do Miocárdio , Insuficiência Renal Crônica , Eletrocardiografia , Humanos , Transplante de Rim/efeitos adversos , Infarto do Miocárdio/epidemiologia , Infarto do Miocárdio/etiologia , Prognóstico , Insuficiência Renal Crônica/complicações , Insuficiência Renal Crônica/cirurgia , Fatores de RiscoRESUMO
BACKGROUND: An absent left ventricular ejection fraction (LVEF) reserve with vasodilator stress with PET cardiac imaging has been shown to provide significant independent and incremental value to the perfusion images for prediction of future cardiovascular adverse events. However, the prognostic value of LVEF reserve has not been well characterized with SPECT myocardial perfusion imaging (MPI). METHODS: We studied 858 consecutive patients with normal and abnormal perfusion pattern with regadenoson SPECT MPI. Change in LVEF was calculated as post-stress LVEF-rest LVEF. Absent LVEF reserve was defined as a drop in LVEF by 5% or more on the post-stress images. The primary outcome was a composite of cardiac death, non-fatal myocardial infarction and late coronary revascularization. RESULTS: An absent LVEF reserve was more common in patients with abnormal vs normal MPI (31% vs 19%, P = .001). During a median follow-up of 32 months, the primary outcome was experienced by 31% of the study population. An absent LVEF reserve was not associated with an increased risk of the primary outcome in patients with normal (hazard ratio 1.1, 95% CI .4-2.7, P = .8) or abnormal (.75, .56-1.00, P = .05) MPI. There was no significant correlation between extent of ischemia and post-stress change in LVEF (Pearson r = - .072, P = .07). CONCLUSIONS: In patients undergoing regadenoson SPECT MPI, absent LVEF reserve is not associated with worse cardiac outcomes. Thus, routine reporting of both post-stress and rest LVEF measurements in this setting may not be necessary.
Assuntos
Imagem de Perfusão do Miocárdio , Humanos , Imagem de Perfusão do Miocárdio/métodos , Prognóstico , Purinas , Pirazóis , Volume Sistólico , Tomografia Computadorizada de Emissão de Fóton Único/métodos , Função Ventricular EsquerdaRESUMO
BACKGROUND: Assessment of quality of life in patients with stable angina and normal gated single-photon emission computed tomography myocardial perfusion imaging (MPI) remains undefined. Symptom evolution in response to imaging findings has important implications on further diagnostic testing and therapeutic interventions. METHODS: Prospective cohort study was conducted at the University of Alabama at Birmingham enrolling 87 adult participants with stable chest pain from the emergency room, hospital setting, and outpatient clinics. Patients underwent MPI with technetium-99m Sestamibi and had a normal study. Participants filled out Seattle Angina Questionnaires initially and at 3-month follow-up. RESULTS: Among the 87 participants (60 ± 12 years; 40% African American, 70% women, 29% diabetes), the mean score increased by an absolute value of 14.2 [95% CI 10.4-18.7, P < .001] in physical limitation, 23.2 [95% CI 17.1-29.4, P < .001] in angina stability, 10.9 [95% CI 7.6-14.1, P < .001] in angina frequency, and 20.6 [95% CI 16.5-24.7, P < .001] in disease perception. There was no significant change in the mean score of treatment satisfaction [- 1.4, 95% CI - 4.7 to 1.8, P = .38]. At 3-month follow-up, 28 of 87 participants (32%) were angina free. CONCLUSIONS: Patients with stable chest pain and normal MPI experience significant improvement in functional status, quality of life, and disease perception in the short term.
