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4121. Right ventricular function after pulmonary autograft replacement of the aortic valve.
作者: G S Carr-White.;M Kon.;T W Koh.;S Glennan.;F D Ferdinand.;A C De Souza.;J R Pepper.;D J Pennell.;D G Gibson.;M H Yacoub.
来源: Circulation. 1999年100卷19 Suppl期II36-41页
The pulmonary autograft operation (the Ross procedure) involves excision of a portion of the right ventricular (RV) outflow tract, prolonged cross-clamp times, and insertion of a pulmonary homograft. There is concern about the effect of such operations on right ventricular function.
4122. Aortic valve replacement with the freestyle stentless bioprosthesis: five-year experience.
作者: K L Yun.;C F Sintek.;A D Fletcher.;T A Pfeffer.;G S Kochamba.;M R Hyde.;J O Torpoco.;S Khonsari.
来源: Circulation. 1999年100卷19 Suppl期II17-23页
Stentless aortic valves were designed to provide a more physiological flow pattern and lower transvalvular gradient, which may have an important bearing on postoperative left ventricular function and remodeling. In this study, we prospectively analyzed the 5-year clinical results with the Freestyle valve (Medtronic, Inc) and its hemodynamic performance by serial echocardiography.
4123. Prospectively randomized evaluation of stentless versus conventional biological aortic valves: impact on early regression of left ventricular hypertrophy.
作者: T Walther.;V Falk.;G Langebartels.;M Krüger.;U Bernhardt.;A Diegeler.;J Gummert.;R Autschbach.;F W Mohr.
来源: Circulation. 1999年100卷19 Suppl期II6-10页
The aim of this prospectively randomized study was to evaluate left ventricular hypertrophy and its regression after stentless versus conventional biological aortic valve replacement.
4124. Modification of the substrate for maintenance of idiopathic human atrial fibrillation: efficacy of radiofrequency ablation using nonfluoroscopic catheter guidance.
作者: S Ernst.;M Schlüter.;F Ouyang.;A Khanedani.;R Cappato.;J Hebe.;M Volkmer.;M Antz.;K H Kuck.
来源: Circulation. 1999年100卷20期2085-92页
Catheter ablative techniques to modify the substrate to maintain atrial fibrillation (AF) require the creation of continuous radiofrequency current-induced ablation lines. This study was designed to assess the efficacy and safety of nonfluoroscopic mapping in this setting.
4125. Cardiogenic shock in patients with acute ischemic syndromes with and without ST-segment elevation.
作者: D R Holmes.;P B Berger.;J S Hochman.;C B Granger.;T D Thompson.;R M Califf.;A Vahanian.;E R Bates.;E J Topol.
来源: Circulation. 1999年100卷20期2067-73页
Cardiogenic shock is usually considered a sequela of ST-segment elevation myocardial infarction. There are limited prospective data on the incidence and significance of shock in non-ST-segment elevation patients. This study assessed the incidence and outcomes of cardiogenic shock developing after enrollment among patients with and without ST-segment elevation in the Global Use of Strategies To Open Occluded Coronary Arteries (GUSTO)-IIb trial.
4126. Early dipyridamole (99m)Tc-sestamibi single photon emission computed tomographic imaging 2 to 4 days after acute myocardial infarction predicts in-hospital and postdischarge cardiac events: comparison with submaximal exercise imaging.
作者: K A Brown.;G V Heller.;R S Landin.;L J Shaw.;G A Beller.;M J Pasquale.;S B Haber.
来源: Circulation. 1999年100卷20期2060-6页
Because of its brief hemodynamic effects and minor effect on determinants of myocardial oxygen demand, vasodilator stress myocardial perfusion imaging (MPI) can be applied very early after acute myocardial infarction (AMI) for risk stratification, allowing management decisions to be made earlier and thus potentially shortening hospitalization stays, reducing costs, and preventing early cardiac events. This multicenter randomized trial compared the prognostic value of early dipyridamole MPI and standard predischarge submaximal exercise MPI in patients who presented with AMI.
4127. Temporal trends in event rates after Q-wave myocardial infarction: the Framingham Heart Study.
作者: U C Guidry.;J C Evans.;M G Larson.;P W Wilson.;J M Murabito.;D Levy.
来源: Circulation. 1999年100卷20期2054-9页
Short-term (<30 day) mortality after Q-wave myocardial infarction (MI) has declined over the decades, but it is unclear if rates of long-term sequelae after Q-wave MI have improved.
4128. Electrical remodeling of the atria following loss of atrioventricular synchrony: a long-term study in humans.
作者: P B Sparks.;H G Mond.;J K Vohra.;S Jayaprakash.;J M Kalman.
来源: Circulation. 1999年100卷18期1894-900页
Evidence suggests that an increased incidence of atrial fibrillation occurs in patients undergoing single-chamber ventricular pacing (VVI) when compared with those undergoing single-chamber atrial pacing (AAI) or those having dual-chamber atrioventricular pacing (DDD). The mechanism for this is unknown. We hypothesized that long-term loss of atrioventricular (AV) synchrony leads to atrial electrical remodeling: a potential explanation for this difference.
4129. Demonstration of the proarrhythmic preconditioning of single premature extrastimuli by use of the magnitude, phase, and distribution of repolarization alternans.
We hypothesized that single premature extrastimuli (S(2)) insufficient to induce reentry produce proarrhythmic effects (proarrhythmic preconditioning) that are measurable by use of the magnitude, phase, and temporal distribution of repolarization alternans (RPA; alternate-beat fluctuations in ECG repolarization).
4130. Initiation of atrial fibrillation by ectopic beats originating from the pulmonary veins: electrophysiological characteristics, pharmacological responses, and effects of radiofrequency ablation.
作者: S A Chen.;M H Hsieh.;C T Tai.;C F Tsai.;V S Prakash.;W C Yu.;T L Hsu.;Y A Ding.;M S Chang.
来源: Circulation. 1999年100卷18期1879-86页
Atrial fibrillation (AF) can be initiated by ectopic beats originating from the atrial or great venous tissues. This study investigated the anatomic characteristics and electrophysiological properties of pulmonary veins (PVs), as well as the possible mechanisms and response to drugs of ectopic foci, and assessed the effects of radiofrequency (RF) ablation on AF initiated by ectopic beats originating from PVs.
4131. Local perivascular delivery of basic fibroblast growth factor in patients undergoing coronary bypass surgery: results of a phase I randomized, double-blind, placebo-controlled trial.
作者: R J Laham.;F W Sellke.;E R Edelman.;J D Pearlman.;J A Ware.;D L Brown.;J P Gold.;M Simons.
来源: Circulation. 1999年100卷18期1865-71页
Angiogenesis is a promising treatment strategy for patients who are not candidates for standard revascularization, because it promotes the growth of new blood vessels in ischemic myocardium.
4132. Platelet function during and after thrombolytic therapy for acute myocardial infarction with reteplase, alteplase, or streptokinase.
作者: M Moser.;T Nordt.;K Peter.;J Ruef.;B Kohler.;M Schmittner.;R Smalling.;W Kübler.;C Bode.
来源: Circulation. 1999年100卷18期1858-64页
Changes in platelet aggregation (PA) and platelet surface receptor expression induced by thrombolytic therapy for acute myocardial infarction may influence the rate of initial reperfusion and early reocclusion.
4133. Vascular effects of estrogen and vitamin E therapies in postmenopausal women.
作者: K K Koh.;A Blum.;L Hathaway.;R Mincemoyer.;G Csako.;M A Waclawiw.;J A Panza.;R O Cannon.
来源: Circulation. 1999年100卷18期1851-7页
Estrogen and vitamin E therapies have been suggested to reduce cardiovascular risk, but comparison of the vascular effects of these therapies to determine mechanisms of potential benefit has not been performed in postmenopausal women.
4134. Usefulness of a tilt training program for the prevention of refractory neurocardiogenic syncope in adolescents: A controlled study.
作者: E Di Girolamo.;C Di Iorio.;L Leonzio.;P Sabatini.;A Barsotti.
来源: Circulation. 1999年100卷17期1798-801页
Recurrent syncope represents a debilitating disorder and quality of life deteriorates as a function of recurrence of symptoms. Although the administration of beta-blockers, vasoconstrictors, fludrocortisone, and serotonin reuptake inhibitors may be helpful in preventing episodes, many patients are intolerant of or respond poorly to these agents. Orthostatic training has been reported to be effective in preventing refractory syncope. Thus, to determine whether a tilt training program could prevent symptoms in adolescents, the following controlled study was undertaken.
4135. Results of a multicenter randomized clinical trial of exercise and long-term survival in myocardial infarction patients: the National Exercise and Heart Disease Project (NEHDP).
This study examined whether a supervised exercise program improved 19-year survival in 30- to 64-year-old male myocardial infarction patients.
4136. The gene encoding atrial natriuretic peptide and the risk of human stroke.
作者: S Rubattu.;P Ridker.;M J Stampfer.;M Volpe.;C H Hennekens.;K Lindpaintner.
来源: Circulation. 1999年100卷16期1722-6页
Recent evidence from an animal model of stroke, the stroke-prone spontaneously hypertensive rat, implicated the gene encoding atrial natriuretic peptide (ANP) as a possible candidate contributing to the likelihood of experiencing a stroke. The purpose of the present study was to investigate the role of ANP in the pathogenesis of cerebrovascular accidents in humans.
4137. Mechanical remodeling of the left atrium after loss of atrioventricular synchrony. A long-term study in humans.
作者: P B Sparks.;H G Mond.;J K Vohra.;A G Yapanis.;L E Grigg.;J M Kalman.
来源: Circulation. 1999年100卷16期1714-21页
Tachycardia-mediated mechanical remodeling of the atrium is considered central to the pathogenesis of thromboembolism associated with chronic atrial fibrillation. Whether atrial mechanical remodeling also occurs in response to atrial stretch induced by chronic asynchronous ventricular pacing in patients with permanent pacemakers is unknown.
4138. Utility of fast cine magnetic resonance imaging and display for the detection of myocardial ischemia in patients not well suited for second harmonic stress echocardiography.
作者: W G Hundley.;C A Hamilton.;M S Thomas.;D M Herrington.;T B Salido.;D W Kitzman.;W C Little.;K M Link.
来源: Circulation. 1999年100卷16期1697-702页
Some patients referred for pharmacological stress testing with transthoracic echocardiography (TTE) are unable to undergo testing owing to poor acoustic windows. Fast cine MRI can be used to assess left ventricular contraction, but its utility for detection of myocardial ischemia in patients poorly suited for echocardiography is unknown.
4139. beta-Particle-emitting radioactive stent implantation. A safety and feasibility study.
作者: A J Wardeh.;I P Kay.;M Sabaté.;V L Coen.;A L Gijzel.;J M Ligthart.;A den Boer.;P C Levendag.;W J van Der Giessen.;P W Serruys.
来源: Circulation. 1999年100卷16期1684-9页
This study represents the Heart Center Rotterdam's contribution to the Isostents for Restenosis Intervention Study, a nonrandomized multicenter trial evaluating the safety and feasibility of the radioactive Isostent in patients with single coronary artery disease. Restenosis after stent implantation is primarily caused by neointimal hyperplasia. In animal studies, beta-particle-emitting radioactive stents decrease neointimal hyperplasia by inhibiting smooth muscle cell proliferation.
4140. Diuretics shift circadian rhythm of blood pressure from nondipper to dipper in essential hypertension.
Recently, we found that sodium restriction shifted the circadian rhythm of blood pressure from nondipper to dipper in patients with the sodium-sensitive essential hypertension. This study examined whether diuretics can transform the circadian rhythm of blood pressure from nondipper to dipper.
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