heart failure (hf) is one of the main causes of death and disability in the world. the prevalence of hf in developed countries is between 1% and 2% of the adult population and approximately between 6% and 10% in the elderly, giving rise to high costs of care and treatment. indeed, in the united states, the direct and indirect costs exceeded 23 billion dollars in 2002.  hf is typically character...

The permeability and coupled behavior of pore pressure and deformations play an important role in hydraulic fracturing (HF) modeling. In this work, a poroelastic displacement discontinuity method is used to study the permeability effect on the HF development in various formation permeabilities. The numerical method is verified by the existing analytical and experimental data. Then the propagati...

Vitamin D deficiency is common among the elderly with and without heart failure (HF). This study was designed to identify the degree of vitamin D deficiency among HF and Non- HF elderly with cardiovascular disease. In this study, fifty hospitalized elderly patients with HF (26 women and 24 men, age range 60-90 years) and fifty elderly without HF were randomly selected. The level of serum 25-hyd...

hydraulic fracturing (hf), as a stimulation technique in petroleum engineering, has made possible the oil production from reservoirs with very low permeability. the combination of horizontal drilling and multiple hf with various perforation angles has been widely used to stimulate oil reservoirs for economical productions. despite the wide use of hf, there are still ambiguous aspects that requi...

background &objectives; : high fat (hf) diet by affecting the oxidative stress and nitric oxide (no) production may lead to different effects on function of the heart after myocardial infarction (mi). in the present study we aimed to address the hypothesis that high release of no by activated macrophages affects lv function after mi. methods : the animals were randomly divided into four groups ...

heart failure (hf) is still a major problem worldwide with high morbidity and mortality rates. the recently developed medication for hf is still incapable of reducing its morbidity and mortality, and clinical data supporting the efficacy and safety of its mainstay therapy remain insufficient. arginine-vasopressin (avp) plays important roles in circulatory and water homeostasis, one of which is ...

Introduction: Dental ceramics are considered as materials that can restore the appearance of natural teeth. Etching the inner surface of a ceramic restoration with hydrofluoric acid (HF) followed by using a silane coupling agent is a well-known and recommended method to increase the bond strength. The aim of etching on ceramic structure is to enhance the surface roughness (Ra) and energy and to...