نتایج جستجو برای: مجموعه qrs
تعداد نتایج: 34080 فیلتر نتایج به سال:
BACKGROUND Cardiac resynchronization therapy (CRT) has been accepted as an established therapy for advanced systolic heart failure. Electrical and mechanical dyssynchrony are usually evaluated to increase the percentage of CRT responders. We postulated that QRS notch can increase mechanical LV dyssynchrony independently of other known predictors such as left ventricular ejection fraction and QR...
Accurate identification of ectopic beats is important in frequency HRV analysis. It may be done by classification of QRS planar loop morphology. The objective of this research was to compare results of QRS morphology analysis in different spatial planes: frontal, horizontal, and preferential. The preferential plane of a QRS loop was found with modijied SPART method. Fourier descriptors of plane...
P wave detection requires a robust QRS-T cancellation method. Some interesting algorithms have been proposed for beat-to-beat QRS-T cancellation. Previous studies have shown that adaptive methods lead to a good cancellation of QRS-T interval which generally guaranty the performances of P wave detection. However, adaptive methods suffer from the non-stationary behavior of the ECG signals and par...
BACKGROUND AND OBJECTIVES In the past two decades, an increasing number of nationwide, Swedish Healthcare Quality Registries (QRs) focusing on specific disorders have been initiated, mostly by physicians. Here, we describe the purpose, organization, variables, coverage and completeness of 103 Swedish QRs. METHODS From March to September 2013, we examined the 2012 applications of 103 QRs to th...
STUDY OBJECTIVES There is a lack of epidemiologic information about duration of QRS complex in the general heart failure population. We sought to describe age, sex, and clinical subset specific prevalence of QRS prolongation in this population. METHODS Data were abstracted from the Resource Utilization Among Congestive Heart Failure Study, which identified 29,686 patients with heart failure f...
AIMS In EchoCRT, a randomized trial evaluating the effect of cardiac resynchronization therapy (CRT) in patients with a QRS duration of <130 ms and echocardiographic evidence of left ventricular dyssynchrony, the primary outcome occurred more frequently in the CRT when compared with the control group. According to current heart failure guidelines, CRT is recommended in patients with a QRS durat...
BACKGROUND Previous studies have shown a significantly higher correlation between left ventricular mass index (LVMi) and high-frequency QRS components (HF-QRS) than between LVMi and QRS amplitudes in the standard frequency range in rabbits. The purpose of the present study was to compare ECG measurements from standard and high-frequency ranges with left ventricular mass (LVM) and LVMi determine...
In order to investigate the relation between the infarcted area in myocardial infarction and the change of the QRS loop, the following method was tried. The normal QRS loops in 3 planes were constructed with the digital computer. Then the vector of an optional segment corresponding to infarction was diminished and the QRS loops were constructed. The comparison of the QRS loops in clinical cases...
مقدمه : حملات تاکیکاردی بطنی یکی از مهم‌ترین علل مرگ قلبی است. حملات تاکی کاردی بطنی با تعبیه دفیبریلاتور داخل قلبی (ICD) قابل درمان است و از مرگ به علت حمله قلبی پیش‌گیری می‌کند . برای استفاده بهینه از این روش درمانی بهتر است افراد در ابتدا براساس معیارهای بالینی یا آزمایشگاهی انتخاب شوند. این مطالعه با هدف بررسی یافته‌های بالینی که پیشگویی‌کننده عود حملات قلبی در بیماران تحت درمان ICD هست...
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