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. 2015 Apr 3:407–435.e18. doi: 10.1016/B978-1-4557-3383-5.00025-7

Table 25-3.

Obstructive Ventilatory Defect

CHARACTERISTICS OF OBSTRUCTIVE VENTILATORY DEFECT

  • Decreased maximum expiratory airflow

  • Decreased MVV

  • Normal or decreased VC

SUPPLEMENTAL DATA CONFIRMING OBSTRUCTION

  • Increased RV

  • Increased airway resistance

  • Abnormal distribution of inspired gas

  • Significant response to bronchodilator

  • Decreased Dl CO

  • Decreased lung elastic recoil

DlCO, diffusing capacity of the lung for carbon monoxide; MVV, maximal voluntary ventilation; RV, residual volume; VC, vital capacity.

Adapted from Welch MH: Ventilatory function of the lungs. In Guenter CA, Welch MH, editors: Pulmonary medicine, Philadelphia, 1977, JB Lippincott, pp 72–123.