Chest
Volume 124, Issue 1, July 2003, Pages 83-89
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Clinical Investigations
Copd
Catabolic/Anabolic Balance and Muscle Wasting in Patients With COPD

https://doi.org/10.1378/chest.124.1.83Get rights and content

Backgroud

The mechanisms leading to muscle wasting in patients with COPD are still uncertain. This study was undertaken to evaluate the relationships among circulating levels of catabolic factors (ie, interleukin [IL]-6 and cortisol), anabolic factors (ie, bioavailable testosterone [Tbio], dehydroepiandrosterone sulfate [DHEAS], and insulin-like growth factor [IGF]-I), and mid-thigh muscle cross-sectional area (MTCSA) in patients with COPD.

Methods

Serum levels of the above factors were measured in 45 men with COPD (mean [± SEM] FEV1, 43 ± 3% predicted; mean age, 67 ± 1 years) and 16 sedentary healthy men of similar age. MTCSA was quantified using CT scanning. Patients with COPD were subdivided into two groups according to the MTCSA (< 70 or ≥ 70 cm2).

Results

There was a greater prevalence of hypogonadism (ie, Tbio, < 2 nmol/L) in patients with COPD compared to control subjects (22% vs 0%, respectively). Patients with an MTCSA of < 70 cm2 had significantly reduced levels of DHEAS compared to those in healthy subjects (p < 0.01). IL-6 levels were significantly higher in both subgroups of COPD patients compared to those in control subjects (p < 0.005). The cortisol/DHEAS, IL-6/DHEAS, IL-6/Tbio, and IL-6/IGF-I ratios were significantly greater in COPD patients with an MTCSA of < 70 cm2 compared to those in control subjects (p < 0.05). The cortisol/DHEAS and IL-6/DHEAS ratios were also significantly greater in COPD patients with an MTCSA of < 70 cm2 than in COPD patients with an MTCSA of ≥ 70 cm2 (p < 0.05). In a stepwise multiple regression analysis, the IL-6/DHEAS ratio explained 20% of the variance in MTCSA (p < 0.005).

Conclusion

Catabolic/anabolic disturbances were found in COPD patients leading to a shift toward catabolism and possibly to the development of peripheral muscle wasting.

Section snippets

Subjects

The study population consisted of 45 men with COPD who were in stable condition, who had participated in our previous study6 evaluating the impact of low muscle mass on survival in COPD, and in whom blood was available for the quantification of anabolic and catabolic factors. The diagnosis of COPD was based on smoking history and on pulmonary function test results showing irreversible airflow limitation.21 Patients with any active inflammatory diseases as well as any other chronic diseases,

Results

The anthropometric characteristics of both subgroups of patients and control subjects are shown in Table 1. Twenty-seven patients with COPD had an MTCSA of ≥ 70 cm2 (86 ± 2 cm2), while the remaining 18 patients had an MTCSA of < 70 cm2 (58 ± 2 cm2). For comparison, the mean MTCSA in the 16 healthy individuals was 96 ± 4 cm2. Patients with an MTCSA of < 70 cm2 had a significantly lower BMI compared to patients with an MTCSA of ≥ 70 cm2 and subjects in the control group. The impairment in

Discussion

In this study, peripheral muscle atrophy was associated with disturbances in catabolism and anabolism and not with the level of impairment in lung function. Marked elevations of catabolic/anabolic factor ratios (ie, cortisol/DHEAS, IL-6/Tbio, IL-6/DHEAS, and IL-6/IGF-1), particularly in patients with COPD and low MTCSAs, indicate that there was a shift toward catabolism in COPD patients. Although none of the catabolic or anabolic factors were related to MTCSA, IL-6/DHEAS ratio, which is a

ACKNOWLEDGMENT

The authors acknowledge the contribution of Fernand Bertrand for his assistance in biochemical measurements, and the technical support of Marthe Bélanger, Marie-Josée Breton, and Brigitte Jean in accomplishing this study. The authors also thank Drs. Yves Deshaies and Guy M. Tremblay for their helpful suggestions regarding the manuscript.

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