منابع مشابه
Residual lung volume in mitral disease.
The degree of lung distension during quiet respiration, the so-called respiratory position or resting expiratory level, is essentially determined by a balance between the passive forces produced by the thoracic wall and the active forces due to the elastic properties of the lung. Therefore the interplay of these forces has a direct role in determining the extent of the functional residual capac...
متن کاملTotal lung capacity, residual volume and predicted residual volume in a densitometric study of older men.
Results of investigations using various lung volumes for hydrostatic weighing determinations (HWD) appear to be inconclusive. Often, these lung volumes are predicted and not clinically determined. For this reason, total lung capacity (TLC), a measured residual volume (RV), and a predicted residual volume (PRV) were used during HWDs to compare the techniques. Twenty-five older men, 56 to 70 year...
متن کاملThe Prognostic Value of Residual Volume/Total Lung Capacity in Patients with Chronic Obstructive Pulmonary Disease
The prognostic role of resting pulmonary hyperinflation as measured by residual volume (RV)/total lung capacity (TLC) in chronic obstructive pulmonary disease (COPD) remains poorly understood. Therefore, this study aimed to identify the factors related to resting pulmonary hyperinflation in COPD and to determine whether resting pulmonary hyperinflation is a prognostic factor in COPD. In total, ...
متن کاملCALCULATION OF RESIDUAL VOLUME BY SPIROMETRIC DATA
ABSTRACT Background: The current practice to measure RV is either by BPG or helium dilution methods which may not be available in all clinics due to their cost. Methods: This paper outlines a method for both direct and indirect calculation of RV via PFT with acceptable sensitivity (81 %, 60% ), specificity (71 %, 94%) and validity (76%, 78%) for obstructive and restrictive lung disease respect...
متن کاملReference Values for Residual Volume, Functional Residual Capacity and Total Lung Capacity
Reference values play an important role in establishing whether, in an individual, measured volumes fall within a range to be expected for a healthy person of the same sex, similar stature, age, and other characteristics. Hence, reference values should be chosen that are appropriate to the person being investigated. Ideally, the reference values should be consistent; in the context of this pape...
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ژورنال
عنوان ژورنال: Heart
سال: 1958
ISSN: 1355-6037
DOI: 10.1136/hrt.20.4.479