Figure 1From: Correlation of exhaled breath temperature with bronchial blood flow in asthmaMethod for the measurement of bronchial blood flow (Qaw). Subjects inhale 60% of their vital capacity from a reservoir containing acetylene 0.3% and then exhale into a mass spectrometer (Panel A). Panel B shows a tracing of acetylene, the area under the curve, corresponding to the conducting airways, is proportional to airway blood flow.Back to article page