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The relationship between inspiratory capacity and emphysematous changes assessed by CT in Vietnamese COPD patients

Hiroshi Wada, Tho Nguyen Van, Trang Le Thi Huyen, Rie Kanda, Yasushi Ryujin, Masafumi Yamaguchi, Tetsuya Oguma, Taishi Nagao, Emiko Ogawa, Lan Le Thi Tuyet, Yasutaka Nakano
European Respiratory Journal 2011 38: p4605; DOI:
Hiroshi Wada
1Division of Respiratory Medicine, Department of Internal Medicine, Shiga University of Medical Science, Otsu, Shiga, Japan
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Tho Nguyen Van
2Faculty of Medicine, University of Medical and Pharmacy, Ho Chi Minh, Viet Nam
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Trang Le Thi Huyen
2Faculty of Medicine, University of Medical and Pharmacy, Ho Chi Minh, Viet Nam
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Rie Kanda
1Division of Respiratory Medicine, Department of Internal Medicine, Shiga University of Medical Science, Otsu, Shiga, Japan
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Yasushi Ryujin
1Division of Respiratory Medicine, Department of Internal Medicine, Shiga University of Medical Science, Otsu, Shiga, Japan
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Masafumi Yamaguchi
1Division of Respiratory Medicine, Department of Internal Medicine, Shiga University of Medical Science, Otsu, Shiga, Japan
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Tetsuya Oguma
1Division of Respiratory Medicine, Department of Internal Medicine, Shiga University of Medical Science, Otsu, Shiga, Japan
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Taishi Nagao
1Division of Respiratory Medicine, Department of Internal Medicine, Shiga University of Medical Science, Otsu, Shiga, Japan
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Emiko Ogawa
3Health Administration Center, Shiga University of Medical Science, Otsu, Shiga, Japan
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Lan Le Thi Tuyet
2Faculty of Medicine, University of Medical and Pharmacy, Ho Chi Minh, Viet Nam
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Yasutaka Nakano
1Division of Respiratory Medicine, Department of Internal Medicine, Shiga University of Medical Science, Otsu, Shiga, Japan
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Abstract

Introduction: It is known that low attenuation volume (LAV) assessed by computed tomography (CT) is related to the severity of chronic obstructive pulmonary disease (COPD). However, the relationship between the regional distribution of emphysema assessed by LAV and inspiratory capacity is not clear.

Objectives: To investigate the relationship between IC and emphysematous changes in each lobe.

Methods: We recruited 76 Vietnamese COPD patients who underwent chest CT and respiratory function tests. We analyzed volumetric CT data and measured the fraction of low attenuation volume (LAV%) in each lobe. We then evaluated the relationship between LAV% in each lobe and inspiratory capacity.

Results: LAV% of the whole lung was significantly related to inspiratory capacity (r=-0.278, p=0.021). LAA% in right lung and left lung were significantly related to inspiratory capacity (r=-0.275, p=0.022, and r=-0.2715, p=0.024, respectively). LAV% of the right upper lobe and middle lobe was not related to inspiratory capacity (p=0.075 and p=0.457, respectively). LAV% of the right lower lobe was significantly related to inspiratory capacity (r=-0.354, p=0.003). LAV% of the left upper lobe was not related to inspiratory capacity (p=0.072). LAV% of the left lower lobe was significantly related to inspiratory capacity (r=-0.371, p=0.002).

Conclusion: Inspiratory capacity is affected more strongly by the emphysematous changes in the lower lobes than in the upper lobes.

  • © 2011 ERS
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The relationship between inspiratory capacity and emphysematous changes assessed by CT in Vietnamese COPD patients
Hiroshi Wada, Tho Nguyen Van, Trang Le Thi Huyen, Rie Kanda, Yasushi Ryujin, Masafumi Yamaguchi, Tetsuya Oguma, Taishi Nagao, Emiko Ogawa, Lan Le Thi Tuyet, Yasutaka Nakano
European Respiratory Journal Sep 2011, 38 (Suppl 55) p4605;

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The relationship between inspiratory capacity and emphysematous changes assessed by CT in Vietnamese COPD patients
Hiroshi Wada, Tho Nguyen Van, Trang Le Thi Huyen, Rie Kanda, Yasushi Ryujin, Masafumi Yamaguchi, Tetsuya Oguma, Taishi Nagao, Emiko Ogawa, Lan Le Thi Tuyet, Yasutaka Nakano
European Respiratory Journal Sep 2011, 38 (Suppl 55) p4605;
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