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Am. J. Respir. Crit. Care Med., Volume 162, Number 4, October 2000, 1518-1523

Airway Wall Thickness in Asthma Assessed by Computed Tomography
Relation to Clinical Indices

AKIO NIIMI, HISAKO MATSUMOTO, RYOICHI AMITANI, YASUTAKA NAKANO, MICHIAKI MISHIMA, MASAYOSHI MINAKUCHI, KOICHI NISHIMURA, HARUMI ITOH, and TAKATERU IZUMI

Departments of Respiratory Medicine, Infectious Disease, Physical Therapy, and Radiology and Nuclear Medicine, Kyoto University, Kyoto, Japan

Postmortem studies have shown that airway wall thickening is present in asthmatic patients and may play a pathophysiologic role. We investigated the presence and characteristics of airway wall thickening in patients with asthma, using helical computed tomography. Eighty-one asthmatic patients and 28 healthy control subjects were studied cross-sectionally. Airway wall thickness was assessed by a validated method on the basis of wall area (WA), WA corrected by body surface area (WA/BSA), and WA%, defined as (WA/total area) × 100 at the apical bronchus of the right upper lobe. Airway luminal area (Ai) and Ai/BSA were also examined. Asthma duration and severity, pulmonary function, and serum eosinophil cationic protein levels were evaluated. Intraobserver and interobserver reproducibility of WA, WA%, and Ai measurements were good. As compared with control, WA, WA/BSA, and WA% were significantly increased in patients with mild (n = 13), moderate (39), and severe persistent () asthma but not in patients with intermittent asthma (). Comparison of the four asthmatic subgroups demonstrated thicker airways in more severe disease, but no difference in Ai or Ai/BSA. When all asthmatic patients were analyzed together, WA and WA/BSA correlated with the duration, although weakly, and severity of asthma. WA and WA/BSA negatively correlated with FEV1 (percentage of predicted), FEV1/FVC (%), and FEF25-75% (percentage of predicted), whereas WA% negatively correlated with only FEV1. We conclude that airway wall thickening occurs in patients with asthma and is not limited to those with severe disease. The degree of airway wall thickening may relate to the duration and severity of disease and the degree of airflow obstruction.




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