نتایج جستجو برای: avr
تعداد نتایج: 2454 فیلتر نتایج به سال:
OBJECTIVES Aortic valve replacement (AVR) with sutureless bioprostheses has become an alternative to conventional AVR for patients with intermediate to high operative risk. However, this technique is associated with an increased risk of postoperative conduction disorders. METHODS We analysed 258 patients who underwent AVR with the Perceval prosthesis from July 2010 to September 2014 at our ce...
AIM This study evaluated the prognostic implications of aVR ST elevation during ST elevation acute myocardial infarction (AMI). METHODS AND RESULTS The Hirulog and Early Reperfusion/Occlusion-2 study randomized 17 073 patients with acute ST elevation AMI within 6 h of symptom onset to receive either bivalirudin or heparin, in addition to streptokinase and aspirin. The treatments had no effect...
This paper presents performance of intelligent fuzzy-based coordinated control for Automatic Voltage Regulator (AVR) and Power System Stabilizer (PSS), to prevent losing synchronism after major sudden faults and to achieve appropriate post-fault voltage level in multi-machine power systems. The AVR and PSS gains can adaptively change to guarantee the power system stability after faults. For cha...
Background Aortic valve replacement (AVR) is the definitive treatment for severe symptomatic aortic stenosis (AS). Aortic stenosis is associated with diastolic dysfunction and left atrial (LA) enlargement. After a successful AVR, there is a decrease in LA size but persistence in diatolic dysfunction. We hypothesized that LA function would help link this discordance. Cardiac magnetic resonance (...
This paper presents the robust design of a Power System Stabilizer (PSS) to improve the stability in the composed two-area Load Frequency Control (LFC) and Automatic Voltage Regulator (AVR) using Artificial Bee Colony (ABC) in a restructured environment. The coupling effects of the LFC and AVR loops are studied by extending the linearized Automatic Generation Control (AGC) system to include the...
BackgroundLong-term outcomes of aortic valve replacement (AVR) are worse in patients with tricuspid regurgitation (TR), but the impact concomitant intervention remains unclear. The purpose this study was to determine effect TR undergoing AVR.MethodsPatients AVR a regional Society Thoracic Surgeons database (2001-2017) were stratified by severity and whether or not they underwent intervention. O...
BACKGROUND Severe pulmonary arterial hypertension in patients with severe aortic stenosis (AS) carries a poor prognosis. There are limited data on the effect of aortic valve replacement (AVR) in these patients. METHODS Our echocardiographic database between 1993 and 2003 was searched for patients with severe AS defined as a Doppler estimated aortic valve area of 0.8 cm2 or less and severe pul...
Introduction Among the 12 leads studied in electrocardiography (ECG), lead aVR can be considered as the most forgotten part of it since no attention is paid to it as the mirror image of other leads. Therefore, the present study has been designed with the aim of evaluating the prevalence of ST segment changes in lead aVR and its relationship with the outcome of these patients. Methods In this ...
BACKGROUND Characteristics and prognosis of hemodialysis patients with severe aortic stenosis have not yet been well defined. METHODS AND RESULTS The CURRENT AS (contemporary outcomes after surgery and medical treatment in patients with severe aortic stenosis) registry, a Japanese multicenter registry, enrolled 3815 consecutive patients with severe aortic stenosis. There were 405 hemodialysis...
BACKGROUND Low mean transvalvular gradient (<40 mm Hg) and small aortic valve area (<1.0 cm(2)) in patients with aortic stenosis (AS) and preserved left ventricular ejection fraction raises uncertainty about the actual severity of the stenosis and survival benefit of aortic valve replacement (AVR). OBJECTIVES This study analyzed studies of mortality and survival impact of AVR in patients with...
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