Your browser doesn't support javascript.
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 76
Filtrar
Filtros adicionais











País/Região como assunto
Intervalo de ano
1.
Clin Res Cardiol ; 2019 Aug 10.
Artigo em Inglês | MEDLINE | ID: mdl-31401672

RESUMO

AIMS: In the placebo-controlled, double-blind BOne marrOw transfer to enhance ST-elevation infarct regeneration (BOOST) 2 trial, intracoronary autologous bone marrow cell (BMC) transfer did not improve recovery of left ventricular ejection fraction (LVEF) at 6 months in patients with ST-elevation myocardial infarction (STEMI) and moderately reduced LVEF. Regional myocardial perfusion as determined by adenosine stress perfusion cardiac magnetic resonance imaging (S-CMR) may be more sensitive than global LVEF in detecting BMC treatment effects. Here, we sought to evaluate (i) the changes of myocardial perfusion in the infarct area over time (ii) the effects of BMC therapy on infarct perfusion, and (iii) the relation of infarct perfusion to LVEF recovery at 6 months. METHODS AND RESULTS: In 51 patients from BOOST-2 (placebo, n = 10; BMC, n = 41), S-CMR was performed 5.1 ± 2.9 days after PCI (before placebo/BMC treatment) and after 6 months. Infarct perfusion improved from baseline to 6 months in the overall patient cohort as reflected by the semi-quantitative parameters, perfusion defect-infarct size ratio (change from 0.54 ± 0.20 to 0.43 ± 0.22; P = 0.006) and perfusion defect-upslope ratio (0.54 ± 0.23 to 0.68 ± 0.22; P < 0.001), irrespective of randomised treatment. Perfusion defect-upslope ratio at baseline correlated with LVEF recovery (r = 0.62; P < 0.001) after 6 months, with a threshold of 0.54 providing the best sensitivity (79%) and specificity (74%) (area under the curve, 0.79; 95% confidence interval, 0.67-0.92). CONCLUSION: Infarct perfusion improves from baseline to 6 months and predicts LVEF recovery in STEMI patients undergoing early PCI. Intracoronary BMC therapy did not enhance infarct perfusion in the BOOST-2 trial.

2.
Clin Transplant ; 33(7): e13616, 2019 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-31136011

RESUMO

BACKGROUND: Only a few previous studies have focused on the interaction between pretransplant psychological variables, survival on the waiting list, and adherence to therapy after heart transplantation (HTx). METHODS: This work combined two studies: Study 1 monitored survival of patients on a HTx waiting list (n = 50) and study 2 examined barriers to adherence after HTx (subgroup of n = 20). All patients were evaluated immediately after listing for HTx (T0). Those in study 2 were also evaluated immediately after HTx (T1) and after 6 months (T2). Psychosocial functioning was measured by the Transplant Evaluation Rating Scale (TERS), and depression and anxiety by Patient Health Questionnaire and Hospital Anxiety and Depression Scale. Barriers to immunosuppressive adherence post-HTx were measured by the Medication Experience Scale for Immunosuppressants (MESI). RESULTS: According to the TERS classification of Rothenhäusler et al, patients were divided into three groups in study 1. Compared with inconspicuous patients (n = 23) and risk patients (n = 21), high-risk patients (n = 6) demonstrated a higher mortality (log-rank test of trend, P = 0.002). In study 2, there was a strong correlation between the TERS (T0) and the MESI (T2) (r = 0.84, P = 0.001). CONCLUSIONS: The TERS may serve as a predictor of survival on the waiting list. There is need for further longitudinal data with larger sample sizes.

3.
BMC Cardiovasc Disord ; 18(1): 163, 2018 Aug 09.
Artigo em Inglês | MEDLINE | ID: mdl-30092774

RESUMO

BACKGROUND: This study aimed to evaluate cost-utility of baroreflex activation therapy (BAT) using the Barostim neo™ device (CVRx Inc., Minneapolis, MN, USA) compared with optimized medical management in patients with advanced chronic heart failure (NYHA class III) who were not eligible for treatment with cardiac resynchronization therapy, from a statutory health insurance perspective in Germany over a lifetime horizon. METHODS: A decision analytic model was developed using the combination of a decision tree and the Markov process. The model included transitions between New York Heart Association (NYHA) health states, each of which is associated with a risk of mortality, hospitalization, cost, and quality of life. The effectiveness of BAT was projected through relative risks for mortality (obtained by application of patient-level data to the Meta-analysis Global Group in Chronic Heart Failure risk prediction model) and hospitalization owing to worsening of heart failure (obtained from BAT Randomized Clinical Trial). All patients were in NYHA class III at baseline. RESULTS: BAT led to an incremental cost of €33,185 (95% credible interval [CI] €24,561-38,637) and incremental benefits of 1.78 [95% CI 0.45-2.71] life-years and 1.19 [95% CI 0.30-1.81] quality-adjusted life-years (QALYs). This resulted in an incremental cost-effectiveness ratio of €27,951/QALY (95% CI €21,357-82,970). BAT had a 59% probability of being cost-effective at a willingness-to-pay threshold of €35,000/QALY (but 84% at a threshold of €52,000/QALY). CONCLUSIONS: BAT can be cost-effective in European settings in those not eligible for cardiac resynchronization therapy among patients with advanced heart failure.

4.
Int J Cardiol ; 266: 187-192, 2018 Sep 01.
Artigo em Inglês | MEDLINE | ID: mdl-29705650

RESUMO

BACKGROUND: In a randomized trial, baroreflex activation therapy (BAT) improved exercise capacity, quality of life and NT-proBNP in patients with heart failure with reduced ejection fraction (HFrEF). In view of different mechanisms underlying HFrEF, we performed a post-hoc subgroup analysis of efficacy and safety of BAT in patients with and without coronary artery disease (CAD). METHODS AND RESULTS: Patients with left ventricular ejection fraction <35% and NYHA Class III were randomized 1:1 to guideline-directed medical and device therapy alone or plus BAT. Patients with a history of CAD, prior myocardial infarction or coronary artery bypass graft were assigned to the CAD group with all others assigned to the no-CAD group. Of 71 BAT treated patients, 52 had CAD and 19 had no CAD. In the control group, 49 of 69 patients had CAD and 20 had no CAD. The system- or procedure-related major adverse neurological or cardiovascular event rate was 3.8% in the CAD group vs. 0% in the no-CAD group (p = 1.0). In the whole cohort, NYHA Class, Minnesota Living with Heart Failure score, 6-minute hall walk distance and NTproBNP were improved in BAT treated patients compared with controls. Statistical analyses revealed no interaction between the presence of CAD and effect of BAT (all p > 0.05). CONCLUSION: No major differences were found in BAT efficacy or safety between patients with and without CAD, indicating that BAT improves exercise capacity, quality of life and NTproBNP in patients with ischemic and non-ischemic cardiomyopathy. CLINICALTRIALS. GOV IDENTIFIER: NCT01471860 and NCT01720160.

5.
Eur Heart J ; 38(39): 2936-2943, 2017 Oct 14.
Artigo em Inglês | MEDLINE | ID: mdl-28431003

RESUMO

Aims: Intracoronary infusion of autologous nucleated bone marrow cells (BMCs) enhanced the recovery of left ventricular ejection fraction (LVEF) after ST-segment elevation myocardial infarction (STEMI) in the randomised-controlled, open-label BOOST trial. We reassessed the therapeutic potential of nucleated BMCs in the randomised placebo-controlled, double-blind BOOST-2 trial conducted in 10 centres in Germany and Norway. Methods and results: Using a multiple arm design, we investigated the dose-response relationship and explored whether γ-irradiation which eliminates the clonogenic potential of stem and progenitor cells has an impact on BMC efficacy. Between 9 March 2006 and 16 July 2013, 153 patients with large STEMI were randomly assigned to receive a single intracoronary infusion of placebo (control group), high-dose (hi)BMCs, low-dose (lo)BMCs, irradiated hiBMCs, or irradiated loBMCs 8.1 ± 2.6 days after percutaneous coronary intervention (PCI) in addition to guideline-recommended medical treatment. Change in LVEF from baseline (before cell infusion) to 6 months as determined by MRI was the primary endpoint. The trial is registered at Current Controlled Trials (ISRCTN17457407). Baseline LVEF was 45.0 ± 8.5% in the overall population. At 6 months, LVEF had increased by 3.3 percentage points in the control group and 4.3 percentage points in the hiBMC group. The estimated treatment effect was 1.0 percentage points (95% confidence interval, -2.6 to 4.7; P = 0.57). The treatment effect of loBMCs was 0.5 percentage points (-3.0 to 4.1; P = 0.76). Likewise, irradiated BMCs did not have significant treatment effects. BMC transfer was safe and not associated with adverse clinical events. Conclusion: The BOOST-2 trial does not support the use of nucleated BMCs in patients with STEMI and moderately reduced LVEF treated according to current standards of early PCI and drug therapy.


Assuntos
Transplante de Medula Óssea/métodos , Infarto do Miocárdio com Supradesnível do Segmento ST/terapia , Células da Medula Óssea/efeitos da radiação , Método Duplo-Cego , Feminino , Raios gama , Humanos , Infusões Intralesionais , Angiografia por Ressonância Magnética , Masculino , Pessoa de Meia-Idade , Intervenção Coronária Percutânea , Transplante de Células-Tronco/métodos , Células-Tronco/efeitos da radiação , Transplante Autólogo , Resultado do Tratamento , Função Ventricular Esquerda/fisiologia
6.
Cell Transplant ; 26(1): 157-170, 2017 01 24.
Artigo em Inglês | MEDLINE | ID: mdl-27539827

RESUMO

Cardiac cell replacement therapy is a promising therapy to improve cardiac function in heart failure. Persistence, structural and functional maturation, and integration of transplanted cardiomyocytes into recipients' hearts are crucial for a safe and efficient replacement of lost cells. We studied histology, electrophysiology, and quantity of intramyocardially transplanted rat neonatal cardiomyocytes (NCMs) and performed a detailed functional study with repeated invasive (pressure-volume catheter) and noninvasive (echocardiography) analyses of infarcted female rat hearts including pharmacological stress before and 3 weeks after intramyocardial injection of 5 × 106 (low NCM) or 25 × 106 (high NCM) syngeneic male NCMs or medium as placebo (Ctrl). Quantitative real-time polymerase chain reaction (PCR) for Y-chromosome confirmed a fivefold higher persisting male cell number in high NCM versus low NCM after 3 weeks. Sharp electrode measurements within viable slices of recipient hearts demonstrated that transplanted NCMs integrate into host myocardium and mature to an almost adult phenotype, which might be facilitated through gap junctions between host myocardium and transplanted NCMs as indicated by connexin43 in histology. Ejection fraction of recipient hearts was severely impaired after ligation of left anterior descending (LAD; pressure-volume catheter: 39.2 ± 3.6%, echocardiography: 39.9 ± 1.4%). Repeated analyses revealed a significant further decline within 3 weeks in Ctrl and a dose-dependent stabilization in cell-treated groups. Consistently, stabilized cardiac function/morphology in cell-treated groups was seen in stroke volume, cardiac output, ventricle length, and wall thickness. Our findings confirm that cardiac cell replacement is a promising therapy for ischemic heart disease since immature cardiomyocytes persist, integrate, and mature after intramyocardial transplantation, and they dose-dependently stabilize cardiac function after myocardial infarction.


Assuntos
Infarto do Miocárdio/terapia , Miócitos Cardíacos/citologia , Miócitos Cardíacos/transplante , Animais , Animais Recém-Nascidos , Débito Cardíaco/fisiologia , Conexina 43/metabolismo , Ecocardiografia , Infarto do Miocárdio/metabolismo , Infarto do Miocárdio/fisiopatologia , Ratos , Reação em Cadeia da Polimerase em Tempo Real , Volume Sistólico/fisiologia
7.
Dtsch Med Wochenschr ; 141(18): 1330-2, 2016 Sep.
Artigo em Alemão | MEDLINE | ID: mdl-27598921

RESUMO

The HOPE-3-Trial investigated the effect of primary prevention on cardio- and neurovascular events in patients without known atherosclerotic disease, but with intermediate risk. In a factorial design Rosuvastatin 10 mg, Candesartan 16 mg/HCT 12.5 mg or both were compared with placebo. Rosuvastatin effectively lowered LDL-cholesterol and the rate of cardio- and neurovascular complications with a NNT of approximately 500/year without detectable effect on mortalitiy. Candesartan 16 mg/HCT 12.5 mg did not influence any endpoint, however, the predefined subgroup of patients with hypertension level I had a benefit. Patients with systolic pressure <131 mmHg even trended towards a higher risk if treated. The combination of statin and blood pressure-lowering agents showed no additive effects. The benefit was solely the result of statin therapy alone. Primary prevention with Rosuvastatin can be recommended if the cardio- and neurovascular risk is 1-2%/year, independent of the initial LDL, although the NNT of 500-1400/year is high and mortalitiy is not decreased. Possibly there will be future studies with longer term follow up to verify a reduction in mortality. Therapy with Candesartan 16 mg/HCT 12,5 mg has a beneficial effect only in patients with hypertension. Further studies with different antihypertensives and more intensive blood pressure lowering are desirable. The approach of combining all three drugs within a poly-pill for primary prevention in an intermediate risk population without elevated blood pressure is not recommended.


Assuntos
Hipertensão , Infarto do Miocárdio , Acidente Vascular Cerebral , Fármacos Cardiovasculares/uso terapêutico , Humanos , Inibidores de Hidroximetilglutaril-CoA Redutases/uso terapêutico , Hipertensão/tratamento farmacológico , Hipertensão/prevenção & controle , Infarto do Miocárdio/tratamento farmacológico , Infarto do Miocárdio/prevenção & controle , Acidente Vascular Cerebral/tratamento farmacológico , Acidente Vascular Cerebral/prevenção & controle
8.
Open Heart ; 3(2): e000411, 2016.
Artigo em Inglês | MEDLINE | ID: mdl-27493761

RESUMO

OBJECTIVE: Functional (or secondary) mitral regurgitation (FMR) is associated with greater morbidity and worse outcomes in patients with congestive heart failure (CHF) and cardiomyopathy. The Carillon® Mitral Contour System® is a coronary sinus-based percutaneous therapy to reduce FMR. We evaluated the safety and efficacy of a modified version of the Carillon device in the treatment of patients with cardiomyopathy and FMR. METHODS: 36 patients with CHF, depressed left ventricular function (ejection fraction <40%) and at least moderate FMR underwent the Carillon device implant. RESULTS: There was 1 major adverse event within 30 days-a death (not device related)-occurring 17 days after the implant. Reductions in FMR and improvements in functional class and 6 min walk tests were seen, similar to prior studies. Device fractures in the high strain region of the proximal anchor (seen in prior studies) were not seen in this study. CONCLUSIONS: The modified Carillon device was associated with improvements in clinical and echocardiographic parameters in treating patients with FMR, while successfully addressing the issue of anchor fracture. This version of the Carillon device will be used in a blinded randomised trial of symptomatic patients with FMR.

11.
Semin Thorac Cardiovasc Surg ; 28(2): 320-328, 2016 Summer.
Artigo em Inglês | MEDLINE | ID: mdl-28043438

RESUMO

The purpose of this publication is to describe the intraoperative experience along with long-term safety and efficacy of the second-generation baroreflex activation therapy (BAT) system in patients with heart failure (HF) and reduced ejection fraction HF (HFrEF). In a randomized trial of New York Heart Association Class III HFrEF, 140 patients were assigned 1:1 to receive BAT plus medical therapy or medical therapy alone. Procedural information along with safety and efficacy data were collected and analyzed over 12 months. Within the cohort of 71 patients randomized to BAT, implant procedure time decreased with experience, from 106 ± 37 minutes on the first case to 83 ± 32 minutes on the third case. The rate of freedom from system- and procedure-related complications was 86% through 12 months, with the percentage of days alive without a complication related to system, procedure, or underlying cardiovascular condition identical to the control group. The complications that did occur were generally mild and short-lived. Overall, 12 months therapeutic benefit from BAT was consistent with previously reported efficacy through 6 months: there was a significant and sustained beneficial treatment effect on New York Heart Association functional Class, quality of life, 6-minute hall walk distance, plasma N-terminal pro-brain natriuretic peptide, and systolic blood pressure. This was true for the full trial cohort and a predefined subset not receiving cardiac resynchronization therapy. There is a rapid learning curve for the specialized procedures entailed in a BAT system implant. BAT system implantation is safe with the therapeutic benefits of BAT in patients with HFrEF being substantial and maintained for at least 1 year.


Assuntos
Barorreflexo , Seio Carotídeo/inervação , Terapia por Estimulação Elétrica , Insuficiência Cardíaca/terapia , Implantação de Prótese , Volume Sistólico , Função Ventricular Esquerda , Biomarcadores/sangue , Terapia por Estimulação Elétrica/efeitos adversos , Terapia por Estimulação Elétrica/instrumentação , Tolerância ao Exercício , Insuficiência Cardíaca/diagnóstico , Insuficiência Cardíaca/fisiopatologia , Humanos , Neuroestimuladores Implantáveis , Peptídeo Natriurético Encefálico/sangue , Fragmentos de Peptídeos/sangue , Complicações Pós-Operatórias/etiologia , Implantação de Prótese/efeitos adversos , Implantação de Prótese/instrumentação , Qualidade de Vida , Recuperação de Função Fisiológica , Fatores de Tempo , Resultado do Tratamento
12.
Cardiovasc Res ; 108(3): 348-56, 2015 Dec 01.
Artigo em Inglês | MEDLINE | ID: mdl-26464333

RESUMO

AIMS: Inhibitory G (Gi) proteins have been proposed to be cardioprotective. We investigated effects of Gαi2 knockout on cardiac function and survival in a murine heart failure model of cardiac ß1-adrenoceptor overexpression. METHODS AND RESULTS: ß1-transgenic mice lacking Gαi2 (ß1-tg/Gαi2 (-/-)) were compared with wild-type mice and littermates either overexpressing cardiac ß1-adrenoceptors (ß1-tg) or lacking Gαi2 (Gαi2 (-/-)). At 300 days, mortality of mice only lacking Gαi2 was already higher compared with wild-type or ß1-tg, but similar to ß1-tg/Gαi2 (-/-), mice. Beyond 300 days, mortality of ß1-tg/Gαi2 (-/-) mice was enhanced compared with all other genotypes (mean survival time: 363 ± 21 days). At 300 days of age, echocardiography revealed similar cardiac function of wild-type, ß1-tg, and Gαi2 (-/-) mice, but significant impairment for ß1-tg/Gαi2 (-/-) mice (e.g. ejection fraction 14 ± 2 vs. 40 ± 4% in wild-type mice). Significantly increased ventricle-to-body weight ratio (0.71 ± 0.06 vs. 0.48 ± 0.02% in wild-type mice), left ventricular size (length 0.82 ± 0.04 vs. 0.66 ± 0.03 cm in wild types), and atrial natriuretic peptide and brain natriuretic peptide expression (mRNA: 2819 and 495% of wild-type mice, respectively) indicated hypertrophy. Gαi3 was significantly up-regulated in Gαi2 knockout mice (protein compared with wild type: 340 ± 90% in Gαi2 (-/-) and 394 ± 80% in ß1-tg/Gαi2 (-/-), respectively). CONCLUSIONS: Gαi2 deficiency combined with cardiac ß1-adrenoceptor overexpression strongly impaired survival and cardiac function. At 300 days of age, ß1-adrenoceptor overexpression alone had not induced cardiac hypertrophy or dysfunction while there was overt cardiomyopathy in mice additionally lacking Gαi2. We propose an enhanced effect of increased ß1-adrenergic drive by the lack of protection via Gαi2. Gαi3 up-regulation was not sufficient to compensate for Gαi2 deficiency, suggesting an isoform-specific or a concentration-dependent mechanism.


Assuntos
Cardiomiopatia Dilatada/metabolismo , Subunidade alfa Gi2 de Proteína de Ligação ao GTP/deficiência , Insuficiência Cardíaca/metabolismo , Miócitos Cardíacos/metabolismo , Receptores Adrenérgicos beta 1/metabolismo , Animais , Fator Natriurético Atrial/genética , Fator Natriurético Atrial/metabolismo , Cardiomiopatia Dilatada/diagnóstico por imagem , Cardiomiopatia Dilatada/genética , Cardiomiopatia Dilatada/fisiopatologia , AMP Cíclico/metabolismo , Proteínas Quinases Dependentes de AMP Cíclico/metabolismo , Modelos Animais de Doenças , Subunidade alfa Gi2 de Proteína de Ligação ao GTP/genética , Subunidades alfa Gi-Go de Proteínas de Ligação ao GTP/genética , Subunidades alfa Gi-Go de Proteínas de Ligação ao GTP/metabolismo , Regulação da Expressão Gênica , Predisposição Genética para Doença , Insuficiência Cardíaca/diagnóstico por imagem , Insuficiência Cardíaca/genética , Insuficiência Cardíaca/fisiopatologia , Camundongos da Linhagem 129 , Camundongos Endogâmicos C57BL , Camundongos Knockout , Miócitos Cardíacos/patologia , Peptídeo Natriurético Encefálico/genética , Peptídeo Natriurético Encefálico/metabolismo , Fenótipo , Receptores Adrenérgicos beta 1/genética , Volume Sistólico , Fatores de Tempo , Ultrassonografia , Função Ventricular Esquerda , Remodelação Ventricular
13.
J Hypertens ; 33(8): 1697-703, 2015 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-26107267

RESUMO

BACKGROUND: Baroreflex activation therapy (BAT) by electrical stimulation of baroreceptors at the carotid sinus is a promising therapeutic approach to reduce elevated blood pressure (BP). To assess the efficacy of long-term BAT, we investigated acute BP alterations after device deactivation and reactivation (on/off effects) in patients on chronic BAT, as well as chronic BP reductions. METHOD: Resistant hypertension patients (n = 17) were enrolled in an open-label, single-arm evaluation of unilateral BAT after exclusion of secondary hypertension. Initial eligibility criteria were SBP≥  140 mmHg, despite stable medical therapy with at least three antihypertensive drugs including at least one diuretic. For on/off testing, several office cuff BP measurements were performed: at rest with activated device, 4-6 min after deactivation, and 4-6 min after reactivation. RESULTS: Before BAT, mean office cuff BP was 179 ±â€Š25 over 98 ±â€Š18 mmHg. At the time of on/off testing (15.1 ±â€Š8.7 months after initial activation and before deactivation), BP was reduced to 147 ±â€Š29 over 84 ±â€Š20 mmHg. On deactivation, SBP increased to 158 ±â€Š38 mmHg (P = 0.004) and DBP to 89 ±â€Š23 mmHg (P = 0.04). After reactivation, SBP decreased to 144 ±â€Š34 mmHg (P = 0.002 vs. deactivation) and DBP to 83 ±â€Š23 mmHg (P = 0.009). There was no correlation between duration of chronic BAT and systolic or diastolic acute on/off response. CONCLUSION: Unilateral BAT reduces BP in patients with resistant hypertension in the long term. There is a significant on/off effect on BP, supporting the efficacy of BAT. The acute on/off response to BAT does not depend on treatment duration. Thus, no evidence of tolerance over time to chronic BAT was found.


Assuntos
Barorreflexo/fisiologia , Pressão Sanguínea , Terapia por Estimulação Elétrica , Hipertensão/terapia , Pressorreceptores/fisiopatologia , Adulto , Idoso , Anti-Hipertensivos/uso terapêutico , Determinação da Pressão Arterial , Seio Carotídeo/fisiopatologia , Diuréticos/uso terapêutico , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Retratamento , Estudos Retrospectivos , Fatores de Tempo , Falha de Tratamento
14.
Eur J Heart Fail ; 17(10): 1066-74, 2015 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-26011593

RESUMO

AIMS: Increased sympathetic and decreased parasympathetic activity contribute to heart failure (HF) symptoms and disease progression. Carotid baroreceptor stimulation (baroreflex activation therapy, BAT) results in centrally mediated reduction of sympathetic and increase in parasympathetic activity. Because patients treated with cardiac resynchronization therapy (CRT) may have less sympathetic/parasympathetic imbalance, we hypothesized that there would be differences in the response to BAT in patients with CRT vs. those without CRT. METHODS AND RESULTS: New York Heart Association (NYHA) Class III patients with an ejection fraction (EF) ≤35% were randomized (1 : 1) to ongoing guideline-directed medical and device therapy (GDMT, control) or ongoing GDMT plus BAT. Safety endpoint was system-/procedure-related major adverse neurological and cardiovascular events (MANCE). Efficacy endpoints were Minnesota Living with Heart Failure Quality of Life (QoL), 6-min hall walk distance (6MHWD), N-terminal pro-brain natriuretic peptide (NT-proBNP), left ventricular ejection fraction (LVEF), and HF hospitalization rate. In this sample, 146 patients were randomized (70 control; 76 BAT) and were 140 activated (45 with CRT and 95 without CRT). MANCE-free rate at 6 months was 100% in CRT and 96% in no-CRT group. At 6 months, in the no-CRT group, QoL score, 6MHWD, LVEF, NT-proBNP and HF hospitalizations were significantly improved in BAT patients compared with controls. Changes in efficacy endpoints in the CRT group favoured BAT; however, the improvements were less than in the no-CRT group and were not statistically different from control. CONCLUSIONS: BAT is safe and significantly improved QoL, exercise capacity, NTpro-BNP, EF, and rate of HF hospitalizations in GDMT-treated NYHA Class III HF patients. These effects were most pronounced in patients not treated with CRT.


Assuntos
Barorreflexo , Terapia por Estimulação Elétrica , Insuficiência Cardíaca/terapia , Idoso , Barorreflexo/fisiologia , Terapia de Ressincronização Cardíaca , Feminino , Insuficiência Cardíaca/fisiopatologia , Humanos , Neuroestimuladores Implantáveis , Masculino , Pessoa de Meia-Idade , Volume Sistólico , Função Ventricular Esquerda
15.
JACC Heart Fail ; 3(6): 487-496, 2015 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-25982108

RESUMO

OBJECTIVES: The objective of this clinical trial was to assess the safety and efficacy of carotid BAT in advanced HF. BACKGROUND: Increased sympathetic and decreased parasympathetic activity contribute to heart failure (HF) symptoms and disease progression. Baroreflex activation therapy (BAT) results in centrally mediated reduction of sympathetic outflow and increased parasympathetic activity. METHODS: Patients with New York Heart Association (NYHA) functional class III HF and ejection fractions ≤35% on chronic stable guideline-directed medical therapy (GDMT) were enrolled at 45 centers in the United States, Canada, and Europe. They were randomly assigned to receive ongoing GDMT alone (control group) or ongoing GDMT plus BAT (treatment group) for 6 months. The primary safety end point was system- and procedure-related major adverse neurological and cardiovascular events. The primary efficacy end points were changes in NYHA functional class, quality-of-life score, and 6-minute hall walk distance. RESULTS: One hundred forty-six patients were randomized, 70 to control and 76 to treatment. The major adverse neurological and cardiovascular event-free rate was 97.2% (lower 95% confidence bound 91.4%). Patients assigned to BAT, compared with control group patients, experienced improvements in the distance walked in 6 min (59.6 ± 14 m vs. 1.5 ± 13.2 m; p = 0.004), quality-of-life score (-17.4 ± 2.8 points vs. 2.1 ± 3.1 points; p < 0.001), and NYHA functional class ranking (p = 0.002 for change in distribution). BAT significantly reduced N-terminal pro-brain natriuretic peptide (p = 0.02) and was associated with a trend toward fewer days hospitalized for HF (p = 0.08). CONCLUSIONS: BAT is safe and improves functional status, quality of life, exercise capacity, N-terminal pro-brain natriuretic peptide, and possibly the burden of heart failure hospitalizations in patients with GDMT-treated NYHA functional class III HF. (Barostim Neo System in the Treatment of Heart Failure; NCT01471860; Barostim HOPE4HF [Hope for Heart Failure] Study; NCT01720160).


Assuntos
Barorreflexo , Terapia por Estimulação Elétrica/métodos , Idoso , Barorreflexo/fisiologia , Feminino , Insuficiência Cardíaca , Humanos , Masculino , Pessoa de Meia-Idade , Implantação de Prótese/métodos , Volume Sistólico/fisiologia , Resultado do Tratamento
16.
Cell Physiol Biochem ; 35(1): 305-14, 2015.
Artigo em Inglês | MEDLINE | ID: mdl-25591772

RESUMO

BACKGROUND: Modelling of cardiac development, physiology and pharmacology by differentiation of embryonic stem cells (ESCs) requires comparability of cardiac differentiation between different ESC lines. To investigate whether the outcome of cardiac differentiation is consistent between different ESC lines, we compared electrophysiological properties of ESC-derived cardiomyocytes (ESC-CMs) of different murine ESC lines. METHODS: Two wild-type (D3 and R1) and two transgenic ESC lines (D3/aPIG44 and CGR8/AMPIGX-7) were differentiated under identical culture conditions. The transgenic cell lines expressed enhanced green fluorescent protein (eGFP) and puromycin-N-acetyltransferase under control of the cardiac specific α-myosin heavy chain (αMHC) promoter. Action potentials (APs) were recorded using sharp electrodes and multielectrode arrays in beating clusters of ESC-CMs. RESULTS: Spontaneous AP frequency and AP duration (APD) as well as maximal upstroke velocity differed markedly between unpurified CMs of the four ESC lines. APD heterogeneity was negligible in D3/aPIG44, moderate in D3 and R1 and extensive in CGR8/AMPIGX-7. Interspike intervals calculated from long-term recordings showed a high degree of variability within and between recordings in CGR8/AMPIGX-7, but not in D3/aPIG44. Purification of the αMHC+ population by puromycin treatment posed only minor changes to APD in D3/aPIG44, but significantly shortened APD in CGR8/AMPIGX-7. CONCLUSION: Electrophysiological properties of ESC-CMs are strongly cell line-dependent and can be influenced by purification of cardiomyocytes by antibiotic selection. Thus, conclusions on cardiac development, physiology and pharmacology derived from single stem cell lines have to be interpreted carefully.


Assuntos
Células-Tronco Embrionárias/citologia , Miócitos Cardíacos/citologia , Acetiltransferases/genética , Acetiltransferases/metabolismo , Potenciais de Ação/efeitos dos fármacos , Agonistas Adrenérgicos beta/farmacologia , Animais , Carbacol/farmacologia , Diferenciação Celular , Linhagem Celular , Eletrodos , Fenômenos Eletrofisiológicos , Células-Tronco Embrionárias/efeitos dos fármacos , Células-Tronco Embrionárias/metabolismo , Proteínas de Fluorescência Verde/genética , Proteínas de Fluorescência Verde/metabolismo , Isoproterenol/farmacologia , Camundongos , Agonistas Muscarínicos/farmacologia , Miócitos Cardíacos/efeitos dos fármacos , Miócitos Cardíacos/metabolismo , Cadeias Pesadas de Miosina/genética , Regiões Promotoras Genéticas
17.
J Cardiovasc Pharmacol Ther ; 20(1): 104-12, 2015 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-24917562

RESUMO

The aim of this study was to investigate whether continuous electrical stimulation affects electrophysiological properties and cell morphology of fetal cardiomyocytes (FCMs) in culture. Fetal cardiomyocytes at day 14.5 post coitum were harvested from murine hearts and electrically stimulated for 6 days in culture using a custom-made stimulation chamber. Subsequently, action potentials of FCM were recorded with glass microelectrodes. Immunostainings of α-Actinin, connexin 43, and vinculin were performed. Expression of ion channel subunits Kcnd2, Slc8a1, Cacna1, Kcnh2, and Kcnb1 was analyzed by quantitative reverse-transcriptase polymerase chain reaction. Action potential duration to 50% and 90% repolarization (APD50 and APD90) of electrically stimulated FCMs were significantly decreased when compared to nonstimulated control FCM. Alignment of cells was significantly higher in stimulated FCM when compared to control FCM. The expression of connexin 43 was significantly increased in stimulated FCM when compared to control FCM. The ratio between cell length and cell width of the stimulated FCM was significantly higher than in control FCM. Kcnh2 and Kcnd2 were upregulated in stimulated FCM when compared to control FCM. Expression of Slc8a1, Cacna1c, and Kcnb1 was not different in stimulated and control FCMs. The decrease in APD50 observed after electrical stimulation of FCM in vitro corresponds to the electrophysiological maturation of FCM in vivo. Expression levels of ion channels suggest that some important but not all aspects of the complex process of electrophysiological maturation are promoted by electrical stimulation. Parallel alignment, increased connexin 43 expression, and elongation of FCM are signs of a morphological maturation induced by electrical stimulation.


Assuntos
Potenciais de Ação/fisiologia , Feto/citologia , Feto/fisiologia , Miócitos Cardíacos/fisiologia , Animais , Células Cultivadas , Estimulação Elétrica/métodos , Fenômenos Eletrofisiológicos/fisiologia , Camundongos , Camundongos Transgênicos
18.
Expert Rev Cardiovasc Ther ; 12(12): 1465-9, 2014 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-25382103

RESUMO

Sympathovagal imbalance plays a major role in the progression of heart failure with reduced ejection fraction. Baroreflex activation therapy (BAT) by electrical stimulation of baroreceptors located at the carotid sinus can reduce sympathetic and increase parasympathetic tone. This review provides an overview on the concept of BAT in heart failure with reduced ejection fraction and available preclinical and clinical data. Animal studies of BAT in heart failure with reduced ejection fraction have demonstrated a decline in plasma norepinephrine, an improved left ventricular ejection fraction, a reduced susceptibility to induced ventricular arrhythmias and a survival benefit. First clinical data from uncontrolled studies suggest a relevant improvement in muscle sympathetic nerve activity, ejection fraction, 6-min walk distance, New York Heart Association (NYHA) class and hospitalization rate. BAT appears to be safe in this severely ill patient population.


Assuntos
Barorreflexo/fisiologia , Insuficiência Cardíaca/terapia , Pressorreceptores/fisiopatologia , Função Ventricular Esquerda/fisiologia , Animais , Pressão Sanguínea/fisiologia , Seio Carotídeo/fisiopatologia , Humanos
19.
Circ Cardiovasc Interv ; 7(6): 806-12, 2014 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-25351198

RESUMO

BACKGROUND: We aimed to test, for the first time, the feasibility of intracoronary delivery of an innovative, injectable bioabsorbable scaffold (IK-5001), to prevent or reverse adverse left ventricular remodeling and dysfunction in patients after ST-segment-elevation myocardial infarction. METHODS AND RESULTS: Patients (n=27) with moderate-to-large ST-segment-elevation myocardial infarctions, after successful revascularization, were enrolled. Two milliliters of IK-5001, a solution of 1% sodium alginate plus 0.3% calcium gluconate, was administered by selective injection through the infarct-related coronary artery within 7 days after myocardial infarction. IK-5001 is assumed to permeate the infarcted tissue, cross-linking into a hydrogel and forming a bioabsorbable cardiac scaffold. Coronary angiography, 3 minutes after injection, confirmed that the injection did not impair coronary flow and myocardial perfusion. Furthermore, IK-5001 deployment was not associated with additional myocardial injury or re-elevation of cardiac biomarkers. Clinical assessments, echocardiographic studies, 12-lead electrocardiograms, 24-hour Holter monitoring, blood tests, and completion of Minnesota Living with Heart Failure Questionnaires were repeated during follow-up visits at 30, 90, and 180 days after treatment. During a 6-month follow-up, these tests confirmed favorable tolerability of the procedure, without device-related adverse events, serious arrhythmias, blood test abnormalities, or death. Serial echocardiographic studies showed preservation of left ventricular indices and left ventricular ejection fraction. CONCLUSIONS: This first-in-man pilot study shows that intracoronary deployment of an IK-5001 scaffold is feasible and well tolerated. Our results have promoted the initiation of a multicenter, randomized controlled trial to confirm the safety and efficacy of this new approach in high-risk patients after ST-segment-elevation myocardial infarction. CLINICAL TRIAL REGISTRATION URL: http://www.clinicaltrials.gov. Unique identifier: NCT01226563.


Assuntos
Implantes Absorvíveis , Alginatos/administração & dosagem , Gluconato de Cálcio/administração & dosagem , Infarto do Miocárdio/terapia , Medicina Regenerativa/métodos , Engenharia Tecidual/métodos , Tecidos Suporte , Disfunção Ventricular Esquerda/terapia , Função Ventricular Esquerda , Remodelação Ventricular , Implantes Absorvíveis/efeitos adversos , Adulto , Idoso , Alginatos/efeitos adversos , Bélgica , Gluconato de Cálcio/efeitos adversos , Estudos de Viabilidade , Feminino , Alemanha , Ácido Glucurônico/administração & dosagem , Ácido Glucurônico/efeitos adversos , Testes de Função Cardíaca , Ácidos Hexurônicos/administração & dosagem , Ácidos Hexurônicos/efeitos adversos , Humanos , Hidrogéis , Injeções Intra-Arteriais , Masculino , Pessoa de Meia-Idade , Infarto do Miocárdio/diagnóstico , Infarto do Miocárdio/fisiopatologia , Projetos Piloto , Valor Preditivo dos Testes , Inquéritos e Questionários , Fatores de Tempo , Tecidos Suporte/efeitos adversos , Resultado do Tratamento , Disfunção Ventricular Esquerda/diagnóstico , Disfunção Ventricular Esquerda/fisiopatologia
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA