Published in:
01-06-2014
The Impact of Low Subcutaneous Fat in Patients with Nontuberculous Mycobacterial Lung Disease
Authors:
Seok Jeong Lee, Yon Ju Ryu, Jin Hwa Lee, Jung Hyun Chang, Sung Shine Shim
Published in:
Lung
|
Issue 3/2014
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Abstract
Background
Nontuberculous mycobacteria (NTM) are pathogens that cause chronic respiratory disease, even in immunocompetent patients. We hypothesized that low subcutaneous fat is a predisposing factor for NTM lung disease.
Methods
Following a retrospective review of medical records from between 2005 and 2012, a total of 148 patients with NTM lung disease and 142 age- and sex-matched controls were enrolled. We evaluated subcutaneous fat using chest computed tomography (CT) scans at the midpole level of the left kidney.
Results
The median age of the patients was 62 years and 60.8 % were female. Approximately 71 % were classified into a nodular bronchiectatic group. The patient group had significantly less subcutaneous fat than the control group (39.3 vs. 53.0 cm2, p = 0.001). Patients with both localized disease (43.5 vs. 53.0 cm2, p = 0.042) and extensive disease (35.9 vs. 53.0 cm2, p < 0.0001) had less subcutaneous fat compared with the control group. No difference in subcutaneous fat was observed with respect to the increasing bacterial load in sputum (p = 0.246). In 20 patients with prominent disease progression during the follow-up period, no significant difference was observed between subcutaneous fat at the initial diagnosis and that at the follow-up CT (36.2 vs. 42.0 cm2, p = 0.47).
Conclusion
Our results suggest that lower subcutaneous fat may contribute to host susceptibility to NTM lung disease.