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Table 128-2

Alterations in Pulmonary Function in Different Respiratory Disease Categories

TLCRVVCFEV1/FVC
ObstructiveN to
Restrictive
Pulmonary parenchymalN to
Extraparenchymal—neuromuscular weaknessVariableVariable
Extraparenchymal—chest wall deformityVariableN

Abbreviations: FEV1, forced expiratory volume in 1 s; FVC, forced vital capacity; N, normal; RV, residual volume.