نتایج جستجو برای: pulmonary circulation
تعداد نتایج: 310371 فیلتر نتایج به سال:
This small book consists of a series of papers dealing with various aspects of hemodynamics in the macro-circulation of the lungs. The papers have little to say about the micro-circulation or the structure of the vessels themselves. Each paper is followed by a spirited discussion which proves to be a salubrious force against bias. The study group includes some of the most able and experienced i...
In recent decades, survival of children with complex congenital heart disease has improved considerably. Specifically, children with a variety of congenital heart defects resulting in 'single ventricle' physiology can now undergo palliative surgery that allows survival beyond the neonatal period, and in many cases into adulthood, despite having a single functional ventricular pumping chamber su...
The pulmonary circulation is a high-flow and low-pressure circuit, with an average resistance of 1 mmHg/min/L in young adults, increasing to 2.5 mmHg/min/L over four to six decades of life. Pulmonary vascular mechanics at exercise are best described by distensible models. Exercise does not appear to affect the time constant of the pulmonary circulation or the longitudinal distribution of resist...
The pulmonary circuit receives the whole of the cardiac output, and the flow through it is governed by events in the systemic circulation. Its function is gaseous exchange, and the low resistance and high capacitance of the circuit is subservient to this function. Local flow is affected by intra-alveolar oxygen tensions and regional flow by passive hydrostatic effects due to gravity. The distri...
Background and purpose: Increased pressure in the pulmonary circulation is of the major factors causing cardiac disorders in patients with thalassemia. The aim of this study was to investigate the relationship between splenectomy and pulmonary arterial pressure in individuals with beta- thalassemia major. Materials and methods: A cross-sectional study was carried out in patients with beta- t...
OBJECTIVE We have recently shown that a considerable amount of pro-inflammatory cytokines is released during pulmonary passage after aortic declamping in patients undergoing coronary artery bypass grafting. The present study was performed to investigate whether bilateral extracorporeal circulation with the lungs as oxygenators can reduce the inflammatory responses of the lungs. METHODS Eighte...
the excess accumulation of water in lung interstitial or alveolar is called pulmonary edema which is caused by factors that upset the normal starling balance in micro-circulation. pulmonary edema disturbs the alveolar gas exchanges which are normally regulated by the respiratory system. mathematical modelling of pulmonary edema may help to predict the lung conditions and the mechanisms involved...
1. Describe the factors that modulate the transition of pulmonary circulation from in utero to after birth. 2. Delineate temporal changes in pulmonary vascular resistance during fetal life. 3. List the substances that play a role in vasoregulation of normal fetal pulmonary circulation. 4. Delineate the role of nitric oxide in increasing pulmonary blood flow at birth. 5. Describe the common phys...
Background Evidence suggests that the anatomical characteristics of the Fontan circulation, in particular the size of the pulmonary arteries, play a key role in the hemodynamic efficiency of the circulation and consequently, patient outcome. Understanding and optimizing early growth of the pulmonary arteries is crucial to avoid later increase in pulmonary vascular resistance, a major risk facto...
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