BACKGROUND Increased extravascular compression and reduced diastolic perfusion time (DPT), rather than vascular remodeling, influence coronary microcirculatory dysfunction in aortic stenosis (AS). However, alterations after aortic valve replacement (AVR) remain unclear. The aim of the present study was to quantify changes in transmural perfusion and coronary vasodilator reserve (CVR), a measure...

BACKGROUND Transcatheter aortic valve replacement (TAVR) has been suggested as a less invasive treatment for high-risk patients with aortic valve disease. In this study, we compared the outcomes of conventional surgical aortic valve replacement (AVR) and TAVR in elderly patients aged over 80. METHODS A total of 108 patients aged 80 years or older who underwent isolated AVR (n=35) or TAVR (n=7...

OBJECTIVES To compare early and long-term outcomes of minimally invasive surgery (MIS) versus full sternotomy (FS) isolated aortic valve replacement (AVR). METHODS We retrospectively analysed all patients who underwent isolated bioprosthetic AVR between 2003 and March 2012 at our institution. Matching was performed based on a propensity score, which was obtained using the output of a logistic...

IMPORTANCE There is a need to describe contemporary outcomes of surgical aortic valve replacement (AVR) as the population ages and transcatheter options emerge. OBJECTIVE To assess procedure rates and outcomes of surgical AVR over time. DESIGN, SETTING, AND PARTICIPANTS A serial cross-sectional cohort study of 82,755,924 Medicare fee-for-service beneficiaries undergoing AVR in the United St...

Results 712 (male 77.5%) patients were operated on, with 609 (85.54%) being isolated CABG and 103 (14.46%) combined CABG with AVR. Average age in isolated CABG and combined groups were 66 and 73 years respectively. Average additive EuroScores were 3.5 and 7.29. 21.6% cases were performed by trainee or staff grade surgeon. In hospital mortality was 0.16% in isolated CABG and 0% in CABG with AVR ...

no significant effect of age, sex, or race on the mean initial R-wave amplitude in lead aVR or its distribution, or on the upper 98% normal limit of the initial R wave, a decrease of the mean R amplitude in aVR with clockwise rotation of the transitional zone, and a highly significant correlation of R amplitude in aVR to that of R in V1, Q3, and Q in aVF, but too low for reliable prediction. Ri...

Introduction Welcome to Atmel Applications Journal Volume 6. I would like to thank all of you for your dedication to the AVR microcontroller family. 2005 has been another great year for us and the AVR product family has enjoyed high double-digit growth, both in revenue and units shipped. Design wins continue to go from strength to strength and we are all very excited about our prospects for 200...

BACKGROUND The use of antithrombotic therapy during the postoperative period after biological aortic valve replacement (AVR) in patients without thromboembolic risk factors remains controversial. Treatment with warfarin is recommended for the first 3 months after biological AVR. The use of antiplatelet therapy - mainly aspirin (ASA) - is suggested as an alternative treatment but its efficacy is...

AIM To determine whether concomitant surgery is a predictor of mortality in patients undergoing surgery for ascending aortic aneursym. METHODS Ninety-nine patients who underwent ascending aortic aneursym surgery between January 2010 and January 2015 were included in this study. Nineteen patients underwent ascending aortic replacement (RAA) only, 36 underwent aortic valve replacement (AVR) and...

The paper describes an optimal parameter selection method of automatic voltage regulator (AVR) for a large power plant in order to improve power system stability. The AVR is generally used to control the output voltage of the generator by regulating the excitation voltage in a generator rotor. In order to improve transient stability in power system, the paper proposes the method to select optim...