Impaired Left Lower Lobe Ventilation in Patients with Cardiomegaly Mark S.M. Alexander, F.R.C.R., A. Michael Peters, M.D., John P. Cleland, M.R.C.P., John Peter Lavender, M.D.  CHEST  Volume 101, Issue 5, Pages 1189-1193 (May 1992) DOI: 10.1378/chest.101.5.1189 Copyright © 1992 The American College of Chest Physicians Terms and Conditions

FIGURE 1 Posterior views of V ˙ with 81mKr, showing reduction of left lower lobe V ˙ (arrow) in supine position, with phenomenon being partially reversed in prone position. CHEST 1992 101, 1189-1193DOI: (10.1378/chest.101.5.1189) Copyright © 1992 The American College of Chest Physicians Terms and Conditions

FIGURE 2 Time-activity curve for ROIs at right and left posterior lung bases following intravenous injection of 133Xe, showing initial peak corresponding to Q ˙ and washout slope corresponding to ventilatory turnover ( V ˙ /vol). CHEST 1992 101, 1189-1193DOI: (10.1378/chest.101.5.1189) Copyright © 1992 The American College of Chest Physicians Terms and Conditions

FIGURE 3 Change in volume with position, showing relative reduction in volume at left base in supine compared with prone position. Volume ratios were calculated from 81mKr inhalation data for V ˙ and intravenous 133Xe washout slope ratios. Lefthand side represents individual patients. Righthand side represents mean values; p value is based on Wilcoxon signed rank test. CHEST 1992 101, 1189-1193DOI: (10.1378/chest.101.5.1189) Copyright © 1992 The American College of Chest Physicians Terms and Conditions