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Results for “Total Lung Capacity”

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PubMed2003

Quantitative CT indexes in idiopathic pulmonary fibrosis: relationship with physiologic impairment.

PURPOSE: To determine whether measurements of skewness, kurtosis, and mean lung attenuation on thin-section computed tomographic (CT) histograms in patients with idiopathic pulmonary fibrosis (IPF) correlate with pulmonary physiologic abnormality in a nonspirometrically controlled multicenter study. MATERIALS AND METHODS: The authors analyzed baseline digital thin-section CT data from 144 patients with IPF who enrolled in a double-blind placebo-controlled clinical effectiveness trial of interferon beta 1a in the treatment of IPF. All patients underwent thin-section CT in the supine position at full inspiration. The lungs were isolated by using a semiautomated thresholding technique, with an upper threshold of -200 HU. An attenuation correction algorithm was used. Pulmonary function tests (PFTs) included forced vital capacity, total lung capacity, forced expiratory volume in 1 second, and diffusing lung capacity. Univariate and multiple correlation and regression statistical analyses were used to determine relationships between histogram features and results of PFTs. RESULTS: Moderate correlations existed between histogram features and PFT results. Kurtosis showed the greatest degree of correlation with physiologic abnormality (r = 0.53, P <.01). Strength of correlation increased with exclusion of suboptimal scans but did not change significantly after application of an attenuation correction algorithm. Attenuations for lungs, gas, and soft tissue varied considerably between scanner manufacturers. Kurtosis alone provided predictions of pulmonary function that were virtually as good as those from all histogram features combined. CONCLUSION: Thin-section CT histograms of the lungs were found to correlate with results of PFTs in patients with IPF, which supports the claim that histogram features can be used as valid indexes of IPF in a multiinstitutional nonspirometrically controlled study.

Algorithms↗

PubMed1980

Respiratory function during cervical and thoracic extradural analgesia in patients with normal lungs.

Lung volumes, expired gas volumes, tests of ventilatory capacity and blood-gas tensions were measured in women before and after induction of cervical or thoracic extradural analgesia using 2% mepivacaine. Inspiratory capacity, vital capacity, total lung capacity and FEV1 all decreased significantly 30 min after both cervical and thoracic extradural blocks. The changes observed during cervical block were significantly greater than those observed during thoracic extradural analgesia. Expiratory reserve volume and functional residual capacity decreased significantly after thoracic extradural block, but did not change after cervical extradural block. Reduction in expired minute volume was observed in the two groups. PaCO2 and alveolar-arterial oxygen tension difference increased, and PaO2 decreased significantly 25 min after both blocks. These results demonstrate that pulmonary ventilation is slightly impaired by the two blocks and to the same degree, but ventilatory reserve and capacity are markedly impaired by cervical extradural block.

Adult↗

PubMed1994

Thoracic kyphosis, rib mobility, and lung volumes in normal women and women with osteoporosis.

STUDY DESIGN: Lung volumes and rib mobility were measured in 15 women with kyphosis resulting from spinal osteoporosis and in 15 healthy women. OBJECTIVES: The study first sought to determine the relationship between thoracic kyphosis and rib mobility and then sought to determine the effect of kyphosis and associated changes in rib mobility on respiratory function. SUMMARY OF BACKGROUND DATA: Spinal deformity in ankylosing spondylitis and scoliosis is associated with alterations in respiratory function. The effect of thoracic kyphosis on respiratory mechanics has not been investigated in an osteoporotic population. METHODS: Lung volumes were measured using a spirometer, and rib mobility, during maximal inspiratory and expiratory maneuvers, was monitored with four motion sensors placed anteriorly, posteriorly, and laterally on the thorax. RESULTS: Vital capacity, inspiratory capacity, total lung capacity, and lateral expansion of the thorax were lower in the osteoporotic group (P < 0.05). There was a significant negative correlation between kyphosis angle and inspiratory capacity, vital capacity, and lateral expansion of the thorax. CONCLUSIONS: Lung volumes and rib mobility were significantly impaired in women with thoracic kyphosis.

Aged↗

PubMed1991

[The pulmonary function and histopathological studies of the lung in diabetes mellitus].

The pulmonary function and microscopic change of the lungs of diabetic patients were examined and compared with those of non-diabetic patients to assess the diabetic microangiopathy in lung. For pulmonary function study, spirogram flow-volume curve, diffusing capacity and arterial blood gas analysis were performed in 52 diabetic patients and 48 age- and sex-matched control subjects. Diffusing capacity, % vital capacity, total lung capacity, residual volume and 25% maximal expiratory flow were significantly less in the diabetic group than in the control group. PaO2 was also decreased in the diabetic group. There were no significant differences between the two groups in the other parameters. For histopathological study, the lungs of 35 autopsied cases of a diabetic group and 26 autopsied cases of a non-diabetic group. There were no significant differences in age and sex between the two groups. The two groups were compared and studied by measuring the thickness of alveolar capillary walls, pulmonary arteriolar walls and alveolar walls with a light microscope and an eye piece micrometer. The alveolar capillary walls, the pulmonary arteriolar walls and the alveolar walls had thickened significantly in the diabetic patients. These studies suggested that histological changes (microangiopathy) in the lungs are a cause of pulmonary function abnormalities.

Adult↗

PubMed1982

Diffusing capacity in idiopathic scoliosis and its interpretation regarding alveolar development.

We measured lung volumes, diffusing capacity by the single breath method (DL), membrane permeability (DM), and capillary blood volume (Vc) in 22 subjects with idiopathic scoliosis (mean angle of curvature, 66 degrees). Compared with an age-matched group, vital capacity, total lung capacity, and functional residual capacity were respectively, 21% (p less than 0.0001), 18% (p less than 0.01), and 15% (p less than 0.05) lower. The DL was 17% lower (p less than 0.01), but specific DL (DL divided by alveolar volume = DLVA) was the same. For both groups, DLVA was inversely correlated with VA. The same qualitative relationship existed between DM, Vc, their specific values, and VA except for a larger spread of Vc in the scoliotic group. The data show that DL and its components, DM and Vc, are normal in idiopathic scoliosis when reduced lung volumes are allowed for. These findings are consistent with partial failure of alveolar enlargement as a result of the thoracic deformity rather than any atrophy of the alveoli or pulmonary vasculature. Thus scoliosis results in a delay of lung development, such that in a group of symptomatic patients with moderate degrees of deformity (mean angle of curvature, 66 degrees), lung volumes and DL are about 80% of that of an age-matched control group; the alveolar characteristics of a 12-yr-old with scoliosis are therefore similar to those of a 9-yr-old normal child.

Adolescent↗

PubMed1984

[Electromyographic determination of the fatigability of respiratory and leg muscles before and after aortocoronary bypass operation].

To study the effect of postoperative confinement to bed on respiratory muscle fatigue, 31 male subjects (age, 34-66 years) undergoing coronary artery revascularization were examined. Fatigue of both respiratory muscles (musculi intercostales externi) and leg muscles (musculus gastrocnemius) was determined by electromyography prior to and 7 and 12 days after operation. Additionally, oscillatory resistance to breathing and phase angle were measured. Pre- and postoperative routine lung function tests were performed. A comparison between preoperative and postoperative measurements reveals that respiratory as well as leg muscle fatigue occurred at higher loads during the preoperative and the second postoperative than during the first postoperative determination. After surgery vital capacity, total lung capacity, 1-second capacity, and, to a lower extent, thoracic gas volume were diminished, while specific airway conductance, oscillatory resistance to breathing, phase angle, residual volume, and relative 1-second capacity remained unchanged. The constancy of the latter parameters indicates that neither airway obstruction nor a significant restriction of the lung and/or thorax occurred due to surgery. Therefore, the increase of respiratory muscle fatigue after surgery may more probably be attributed to a lack of training of respiratory muscles which may contribute to limitation of ventilation in bedridden patients.

Adult↗

PubMed1990

Clearance of 99mTc-DTPA in pigeon fancier's hypersensitivity pneumonitis.

The rate of clearance of inhaled 99mTc-DTPA was measured in 20 nonsmoking pigeon fanciers and 7 control subjects. The degree of their avian contact and pigeon-related symptoms were noted, humoral immune response in the form of IgG antibody to pigeon gamma globulin was quantified, and diffusing capacity and total lung capacity were measured. Thirteen fanciers who had a high level of antibody had increased rates of clearance of 99mTc-DTPA (mean half-time clearance of 16.8 [+/- SEM 2.02] min [p = 0.001]) even if they were asymptomatic and even if their diffusing capacity and total lung capacity were normal. Seven control subjects without exposure to pigeon-derived antigens had normal clearance (mean 72.6 [+/- 5.98] min), and seven fanciers with antigen exposure but without an antibody response had intermediate rates of clearance (mean 42.57 [+/- 5.11] min). Clearance was not directly related to the indices of intensity and duration of antigen exposure. The measurement of rate of clearance of 99mTc-DTPA in pigeon fanciers can identify an alteration in pulmonary integrity more subtle than found with conventional pulmonary function tests and may therefore be a useful test for studying the pulmonary response to inhaled antigen and for detecting the earliest stages in the evolution of hypersensitivity pneumonitis.

Animals↗

PubMed1983

Effects of obesity on respiratory function.

Obesity, because it alters the relationship between the lungs, chest wall, and diaphragm, has been expected to alter respiratory function. We studied 43 massively obese but otherwise normal, nonsmoking, young adults with spirometry, lung volume measurement by nitrogen washout, and single-breath diffusing capacity for carbon monoxide (DLCO). Changes in respiratory function were of two types, those that changed in proportion to degree of obesity--expiratory reserve volume (ERV) and DLCO--and those that changed only with extreme obesity--vital capacity, total lung capacity, and maximal voluntary ventilation. When compared with commonly used predicting equations, we found that mean values of subjects grouped by degree of obesity were very close to predicted values, except in those with extreme obesity in whom weight (kg)/height (cm) exceeded 1.0. In 29 subjects who lost a mean of 56 kg, significant increases in vital capacity, ERV, and maximal voluntary ventilation were found, along with a significant decrease in DLCO. Because most subjects fell within the generally accepted 95% confidence limits for the predicted values, we concluded that obesity does not usually preclude use of usual predictors. An abnormal pulmonary function test value should be considered as caused by intrinsic lung disease and not by obesity, except in those with extreme obesity.

Adult↗

PubMed1988

Are reduced lung volumes in IDDM due to defect in connective tissue?

Lung volumes were measured by spirometry and helium-dilution technique in 28 young adult men with insulin-dependent diabetes mellitus (IDDM) of long duration and compared with 16 age- and height-matched adult men without diabetes. Reduced values for forced expiratory volume at 1 s, vital capacity, functional residual capacity, total lung capacity, residual volume, and single-breath carbon monoxide transfer factor were found for the IDDM patients compared to the control subjects. The results are consistent with reduced lung volumes in IDDM patients and did not correlate with the presence or absence of mild cheiroarthropathy but may relate to duration of diabetes.

Adult↗

PubMed2002

Small-volume image-guided radiotherapy using hypofractionated, coplanar, and noncoplanar multiple fields for patients with inoperable Stage I nonsmall cell lung carcinomas.

BACKGROUND: Occasionally, medically compromised and/or elderly patients with nonsmall cell lung carcinomas (NSCLCs) cannot be treated surgically. We investigated small-volume hypofractionated image-guided radiotherapy (IGRT) without the need for breath control in patients with inoperable Stage I NSCLCs. METHODS: Between September 1996 and September 1999, 22 patients with Stage I NSCLCs, including 19 males and 3 females, were treated with IGRT. Among these patients, there were 13 Stage IA and 9 Stage IB tumors. The tumors ranged in size from 14.2 to 58.5 mm, with a median size of 26.7 mm. Of the 22 patients, 19 were unfit for surgical treatment due to poor pulmonary function, complications, and/or advanced age and 3 refused surgery. Computed tomographic scans (CT) of the primary tumor were taken during three respiratory phases and they were analyzed to determine the planning target volume, which included only the primary tumor with allowances for respiratory movement. The radiation doses administered at the edge of the moving tumor during normal breathing were 80% of the prescribed dose, either 48 or 60 Gy given in eight fractions over 2 weeks. Clinical evaluation, chest CT scan, and pulmonary function tests were performed before irradiation and at regular intervals for the post-IGRT follow-up. The median follow-up period was 24 months (range, 2-44 months; mean, 21.8 months) (at least 24 months for survivors). RESULTS: Of 17 tumors assessed at the initial follow-up 2-6 months after treatment (5 complete responses, 11 partial responses, and 1 progressive disease), 16 (94%) were controlled locally. One local recurrence was observed during the follow-up. The lung carcinoma-specific survival rate at 1 year was 94% and the 1-year actuarial recurrence-free survival rate was 71%. The lung carcinoma-specific survival rate at 2 years was 73% and the 2-year actuarial recurrence-free survival rate was 67%. The treatment was well tolerated and no major side effects were observed. Localized radiation pneumonitis was observed in all patients who were examined by CT scan, but the patients were asymptomatic. Parameters of pulmonary function, including vital capacity, total lung capacity, and diffusion capacity for carbon monoxide, decreased very little or not at all, indicating that IGRT rarely deteriorated pulmonary functions. CONCLUSIONS: Small-volume hypofractionated IGRT without breath control is a feasible and beneficial method for the curative treatment of patients with Stage I NSCLCs. It has the potential of a high local tumor control rate and low morbidity.

Aged↗

PubMed1983

Chest wall stiffness in patients with chronic respiratory muscle weakness.

Using the weighted spirometer technique we studied chest wall compliance (Cw) in 16 nonobese patients with chronic weakness of the respiratory muscles and 20 healthy control subjects. In order to evaluate the validity of the technique, while Cw was being measured, we monitored thoracoabdominal configuration with 2 pairs of linearized magnetometers and electrical activity of the external oblique with a concentric needle electrode in 3 healthy subjects and 4 patients; in addition, we recorded in 3 subjects the electrical activity from the intercostal muscles and diaphragm throughout the procedure. The method was reproducible within 5.8% and provided Cw values that compared well with those yielded by the relaxation technique. In each subject, the weight-induced shifts in end-expiratory lung volume showed a very good linear correlation with the changes in transrespiratory pressure at end-expiration (r greater than or equal to 0.91). In addition, in none of the subjects tested did the electromyograms reveal any intercostal, diaphragmatic, or abdominal muscle activity at end-expiration, nor did the end-expiratory level ever show a significant departure from the relaxed thoracoabdominal configuration, thus suggesting adequate respiratory muscle relaxation. The reduction in inspiratory muscle force in the patients ranged from 17 to 94% of predicted (mean +/- SE, 43 +/- 6). The decrease in vital capacity, total lung capacity, and functional residual capacity averaged 59, 34, and 15% of predicted, respectively. Both the patient and the control groups showed a large interindividual variability regarding Cw. It varied from 0.117 to 0.258 L/cm H2O (mean +/- SE, 0.162 +/- 0.012) in the patients and from 0.163 to 0.366 L/cm H2O (mean +/- SE, 0.248 +/- 0.013) in the healthy subjects.(ABSTRACT TRUNCATED AT 250 WORDS)

Abdominal Muscles↗

PubMed2005

A role for MCP-1/CCR2 in interstitial lung disease in children.

BACKGROUND: Interstitial lung diseases (ILD) are chronic inflammatory disorders leading to pulmonary fibrosis. Monocyte chemotactic protein 1 (MCP-1) promotes collagen synthesis and deletion of the MCP-1 receptor CCR2 protects from pulmonary fibrosis in ILD mouse models. We hypothesized that pulmonary MCP-1 and CCR2+ T cells accumulate in pediatric ILD and are related to disease severity. METHODS: Bronchoalveolar lavage fluid was obtained from 25 children with ILD and 10 healthy children. Levels of pulmonary MCP-1 and Th1/Th2-associated cytokines were quantified at the protein and the mRNA levels. Pulmonary CCR2+, CCR4+, CCR3+, CCR5+ and CXCR3+ T cells were quantified by flow-cytometry. RESULTS: CCR2+ T cells and MCP-1 levels were significantly elevated in children with ILD and correlated with forced vital capacity, total lung capacity and ILD disease severity scores. Children with lung fibrosis had significantly higher MCP-1 levels and CCR2+ T cells in bronchoalveolar lavage fluid compared to non-fibrotic children. CONCLUSION: The results indicate that pulmonary CCR2+ T cells and MCP-1 contribute to the pathogenesis of pediatric ILD and might provide a novel target for therapeutic strategies.

Adolescent↗

PubMed1978

Physiologic effects of bronchopulmonary lavage in alveolar proteinosis.

The clinical and physiologic effects of bronchopulmonary lavage of both lungs at separate times in 14 patients with alveolar proteinosis proved by biopsy were followed for 2 to 96 months. Before lavage, all patients had moderate to severe dyspnea on exertion. Twelve had a nonproductive cough, and 2 had a productive cough; both were smokers. Nine had generalized fatigue, and 4 had weight loss. Twelve of 14 had fine inspiratory rales. All of the patients had abnormal chest roentgenograms, and 13 of 14 had an increased lactate dehydrogenase concentration. After lavage, all patients had loss of fatigue and improved exercise tolerance, with most returning to normal activity. Cough cleared in 12 of 14 and remained only in the cigarette smokers. Inspiratory rales cleared completely in most patients (11 of 12) and partially in one. The rales usually returned during exacerbations. Physiologic measurements that changed significantly after bilateral lavage included: vital capacity, total lung capacity, resting room air PO2, exercise PO2, PO2 while breathing 100 per cent O2, and DLCO. Because all measurements were made within 5 days of the second lavage, one must attribute the acute improvement to the removal of proteinaceous material from the alveoli. The long-term effects varied; some patients required annual or semiannual lavages, wherease others remained in remission after lavage for 36 to 96 months. Exacerbations were accompanied by increased dyspnea, reappearance of rales, and deterioration of the gas-exchange parameters noted previously. Repeat lavage reversed the clinical symptoms and physiologic abnormalities in patients who had recurrences.

Adult↗

PubMed1997

Therapeutic effects of diuretics and paracentesis on lung function in patients with non-alcoholic cirrhosis and tense ascites.

BACKGROUND/AIMS: Ascites may cause or aggravate pulmonary dysfunction in patients with liver cirrhosis. Diuretics and paracentesis are the main therapies for ascites. The aim of the present study was to evaluate and compare the therapeutic effects of diuretics and large-volume paracentesis on lung function in 26 male patients with non-alcoholic cirrhosis and tense ascites. METHODS: The patients were divided into two groups. Group A was composed of 13 subjects who were treated with diuretics including spironolactone (100-400 mg/day) and furosemide (80-320 mg/day). In group B, 13 subjects received large-volume paracentesis plus intravenous albumin (6-8 g/l ascites removed). Pulmonary function tests including spirometry, plethysmography, single-breath carbon-monoxide diffusing capacity (DLco) and arterial blood gases, were done 1 day before diuretic treatment and 1 day after termination of the study in group A patients, and 1 day before and after large-volume paracentesis in group B subjects. RESULTS: Before treatment, the clinical and laboratory data were comparable between the two groups. After treatment, ventilatory function as evidenced by forced expiratory volume in 1 s, forced vital capacity, total lung capacity, functional residual capacity and expiratory reserve volume, and DLco increased significantly in both groups. Arterial PO2 and PCO2 increased significantly and AaPO2 (alveolar-arterial PO2 difference) decreased significantly in the subjects treated with diuretics. Nevertheless, paracentesis did not improve arterial blood gases. The changes in lung volumes, DLco and PaO2 after treatment (the data after minus those before treatment) were comparable, except that a significant decrease in AaPO2 was observed in the diuretic group. CONCLUSIONS: Both diuretic therapy and large-volume paracentesis significantly improved the ventilatory function in patients with tense cirrhotic ascites. In terms of oxygenation improvement as evaluated by AaPO2, diuretic treatment may be superior to large-volume paracentesis.

Aged↗

PubMed2003

Correlation between standing height, sitting height, and arm span as an index of pulmonary function in 6-10-year-old children.

The present study evaluates the relationships of pulmonary volumes and flows and the anthropometric variables of standing height, sitting height, and arm span in 100 6-10-year-old children. To be included in the study, all children were required to be healthy and above the 3rd percentile of the curve of Tanner et al. (Arch Dis Child 1966;41:454-471; Arch Dis Child 1966;41:613-635) for height and weight. Standing height, sitting height, and arm span were measured according to standard protocol. The pulmonary function measurements were: tidal volume, minute respiratory volume, respiratory rate, expiratory reserve volume, inspiratory capacity, vital capacity, residual volume (RV), functional residual capacity, total lung capacity (TLC), forced vital capacity (FVC), forced expiratory volume in 1 sec of FVC (FEV(1)), forced expiratory flow measured between 25-75% of FVC, and FEV(1)/FVC and RV/TLC ratios. Simple linear regression best expressed the correlation between pulmonary function and the anthropometric variables. Significant correlations between anthropometric and pulmonary function measurements were observed, with FVC and FEV(1) showing the highest and RV the lowest r(2) values. There was a significant positive correlation between standing height and arm span according to linear regression and Bland-Altman comparison (Bland and Altman, Lancet 1968;8:307-310). Our results suggest that when an accurate determination of standing height cannot be obtained, arm span could be used interchangeably, using the same regression equation. However, for patients with limb deformities, regression equations of pulmonary function measurements in relation to sitting height may be a better choice for estimating pulmonary function.

Anthropometry↗

PubMed1983

Ventilatory failure due to asbestos pleurisy.

Seven patients are described who had a distinctive syndrome of chest wall restriction caused by asbestos-induced pleural fibrosis. All had severe dyspnea and predominant pleural disease on radiographic examination, with pulmonary function findings of reduced vital capacity, total lung capacity (measured in five patients), and maximal voluntary ventilation. Five patients had ventilatory failure with carbon dioxide retention; four of these have died and one is close to death. Examination of the thoracic organs in five patients showed minimal or no parenchymal fibrosis in three and less severe involvement of the parenchyma than of the pleura in the remaining two. Neoplasms were suspected in three patients because of extension of the pleural fibrosis into the lung. Two of these patients had pleural uptake of 67-gallium citrate attributable to the inflammatory reaction. With the increasing duration since onset of exposure in the nine million workers who have been exposed to asbestos, as well as in other exposed persons, it is expected that additional cases of ventilatory failure caused by asbestos-induced pleural fibrosis will be encountered.

Aged↗

PubMed1995

A comparison of 'abruptly stopping' with 'tailing off' oral corticosteroids in acute asthma.

Systemic corticosteroids are almost universally used in the treatment of severe acute asthma but the optimum length of treatment with corticosteroids following recovery from an acute attack of asthma is not established. Thirty-five patients admitted with acute asthma and treated with oral prednisolone 40 mg daily in addition to bronchodilator therapy until full recovery, with stable peak expiratory flow recordings (PEF) within 15% of their previous best PEF or predicted PEF were studied. They were all discharged home on regular inhaled corticosteroids and regular or as required use of bronchodilators and randomized to receive either prednisolone 40 mg daily or placebo for the first 14 days. Median PEF values increased from 31% predicted on admission to hospital to 71% predicted on discharge from hospital in the active treatment group (19 patients) and from 32-73% in the placebo group (16 patients). There was no difference between the two groups in the median values of the forced expiratory volume in one second, forced vital capacity, total lung capacity or diurnal variation in PEF either at the time of discharge from hospital or at 14 and 28 days after discharge from hospital. This study suggests that there is no need to reduce prednisolone gradually following recovery from an exacerbation of asthma, provided systemic corticosteroid treatment is continued until a satisfactory and stable PEF is achieved.

Acute Disease↗

PubMed1994

Antiglomerular basement membrane disease: the long-term pulmonary outcome.

We have evaluated long-term pulmonary function in 14 patients who were treated for anti-glomerular basement membrane disease at our institution during the last 17 years. Eight of these patients had evidence of pulmonary involvement, as manifested by hemoptysis, pulmonary infiltrates on chest x-ray film, or anemia. These patients were compared with a control group of 15 patients who had renal disease and who were matched for degree and duration of renal disease, age, smoking history, and method of renal replacement. The following variables were measured in each patient: forced vital capacity, forced expiratory volume in 1 minute, vital capacity, total lung capacity, residual volume, functional residual capacity, single-breath carbon monoxide transfer factor, and single-breath carbon monoxide transfer factor corrected for alveolar volume (KCO). These patients also participated in a graded exercise test and measurements of oxygen uptake, carbon dioxide production, minute ventilation, and oxygen saturation were taken. Patients with anti-glomerular basement membrane disease and a prior history of pulmonary hemorrhage had a significantly reduced KCO (46% +/- 10% v 68.7% +/- 14.7%) compared with the control group. There was no difference in any of the other measured parameters.

Adult↗