نتایج جستجو برای: ef is reduced therefore
تعداد نتایج: 7499463 فیلتر نتایج به سال:
Iron (Fe) deficiency induces chlorosis (IDC) in plants and can result in reduced plant productivity. Therefore, development of Fe-efficient plants is of great interest. To gain a better understanding of the physiology of Fe-efficient plants, putative novel plant variants were regenerated from potato (Solanum tubersosum L. var. 'Iwa') callus cultures selected under Fe deficient or low Fe supply ...
BACKGROUND Heart failure (HF) can occur in patients with preserved (HFpEF, EF≥50%) or reduced (HFrEF, EF<50%) ejection fraction (EF), but changes in EF after HF diagnosis are not well described. METHODS AND RESULTS Among a community cohort of incident HF patients diagnosed from 1984 to 2009 in Olmsted County, Minnesota, we obtained all EFs assessed by echocardiography from initial HF diagnosi...
BACKGROUND To assess the prevalence, determinants, and prognosis value of right ventricular (RV) ejection fraction (EF) impairment in organic mitral regurgitation. METHODS AND RESULTS Two hundred eight patients (62±12 years, 138 males) with chronic organic mitral regurgitation referred to surgery underwent an echocardiography and biventricular radionuclide angiography with regional function a...
Congestive heart failure (HF) is a frequent reason for hospital admission. Fifty percent of HF hospitalizations have normal ejection fraction (EF),1 referred to as diastolic HF (DHF). In contrast, patients with systolic HF (SHF) have reduced EF. The DHF phenotype describes patients with signs and symptoms of HF, normal EF, normal left ventricular (LV) volume, hypertension with increased relativ...
BACKGROUND Ritter's method is a tool used to optimize AV delay in DDD pacemaker patients with normal left ventricular function only. The goal of our study was to evaluate Ritter's method in AV delay-interval optimization in patients with reduced left ventricular function. METHODS Patients with implanted DDD pacemakers and AVB III degrees were assigned to one of two groups according to ejectio...
drought is transient phenomenon , slow , repetitive and integral part of the climate of each region. drought begins with a substantial reduction in precipitation over the long-term average rainfall and over time, reduced soil moisture and surface and ground water resources will continue to decrease. this phenomenon is the most important in bakhtegan basin because of its importance in strategic ...
BACKGROUND Heart failure (HF) with preserved (HFpEF) left ventricular ejection fraction (LVEF) is a syndrome with complex pathophysiology. Little is known about changes in LVEF that occur over time in HFpEF patients. A fundamental clinical question about HFpEF is whether HFpEF is an early manifestation of HF with reduced LVEF (HFrEF). If so, which patients with HFpEF are likely to show a declin...
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