IS MEASUREMENT OF BETA ANGLE IN FLOW VOLUME LOOP USEFUL FOR DIAGNOSIS OF AIRWAYS OBSTRUCTION?

Q: How can I download an article?

To download an article from SID, first log in to the site, search for the article title, and click on the 'Download Article' option.

Q: How can I download an ISI article?

To download an ISI article on SID, enter the keyword or article title in the search bar, view the relevant results, click on the desired article, and select the 'Download Article' option.

Q: How can I access the SID database?

To access the SID database, visit SID.ir, create an account, and log in to access scientific resources.

Q: Is downloading articles from SID free?

Some articles on SID are available for free, while others require payment. Details are specified on the article's page.

ZAHMATKESH M.M.; ASADIAN A.A.; EHTESHAMI AFSHAR A.

مرکز اطلاعات علمی Scientific Information Database (SID) - Trusted Source for Research and Academic Resources

Journal Paper

Paper Information

Journal: TANAFFOS Year:2003 | Volume:2 | Issue:5 Page(s): 37-42

Download Full-Text

Persian Verion

View:

1,141

Download:

211

Cites:

Information Journal Paper

Title

IS MEASUREMENT OF BETA ANGLE IN FLOW VOLUME LOOP USEFUL FOR DIAGNOSIS OF AIRWAYS OBSTRUCTION?

Author(s)

ZAHMATKESH M.M. | ASADIAN A.A. | EHTESHAMI AFSHAR A. | Issue Writer Certificate

Keywords

FLOW-VOLUME LOOP (CURVE)Q4

BETA ANGLEQ4

OBSTRUCTIVE PULMONARY DISEASEQ4

CIGARETTE SMOKINGQ4

Abstract

Backgrounds: Spirometry is the most common method for evaluation of lung function, and the shape of flow-volume loop is very helpful for recognition of pulmonary disease pattern particularly, the site and severity of airway obstruction. The slope of descending arch of expiratory curve is one of the criteria which determine the severity of lower airways obstruction. Measurement of BETA ANGLE is one of the methods for determination of this slope. Beta-angle is characterized by determination of three points on the flow-volume loop. Its vertex is maximum flow in the middle of vital capacity (V.max 50%). Its other points are the outset of residual volume (RV) on the volume axis and the peak flow on the flow axis. Materials & Methods: This is a cross-sectional descriptive study. To determine the measurement of Beta- angle, the flow-volume curve was examined in 325 patients, (smokers and non-smokers) randomly. These patients were referred for pulmonary function tests to our hospital. All the patients underwent standard spirometry and used SPSS package for calculating the results. Results: Following results were obtained: The size of Beta-angle decreased with the increase of age, from the third decade of life and onward. There was a significant difference in the mean Beta-angle between the smokers that consumed more than 20 pack-year and the non-smokers. The size of Beta-angle decreased with obstruction of peripheral airways, but it had no correlation with restrictive lesions. Conclusion: The size of this angle decreased with the reduction of different pulmonary measures such as FEV1, FEV1/FVC, and FEF25-75%. The size of Beta-angle is useful for detecting patient with obstructive lung disease. Abbreviations: FEV1= forced expiratory volume in second one FVC= forced vital capacity FEF25-75= forced expiratory flow in mid-portion of vital capacity.

Cites

No record.

References

SMOKING AND LUNG FUNCTION

Cite

APA: Copy

ZAHMATKESH, M.M., ASADIAN, A.A., & EHTESHAMI AFSHAR, A.. (2003). IS MEASUREMENT OF BETA ANGLE IN FLOW VOLUME LOOP USEFUL FOR DIAGNOSIS OF AIRWAYS OBSTRUCTION?. TANAFFOS, 2(5), 37-42. SID. https://sid.ir/paper/52644/en

Vancouver: Copy

ZAHMATKESH M.M., ASADIAN A.A., EHTESHAMI AFSHAR A.. IS MEASUREMENT OF BETA ANGLE IN FLOW VOLUME LOOP USEFUL FOR DIAGNOSIS OF AIRWAYS OBSTRUCTION?. TANAFFOS[Internet]. 2003;2(5):37-42. Available from: https://sid.ir/paper/52644/en

IEEE: Copy

M.M. ZAHMATKESH, A.A. ASADIAN, and A. EHTESHAMI AFSHAR, “IS MEASUREMENT OF BETA ANGLE IN FLOW VOLUME LOOP USEFUL FOR DIAGNOSIS OF AIRWAYS OBSTRUCTION?,” TANAFFOS, vol. 2, no. 5, pp. 37–42, 2003, [Online]. Available: https://sid.ir/paper/52644/en

Related Journal Papers