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J Appl Physiol 84: 726-732, 1998;
8750-7587/98 $5.00
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Vol. 84, Issue 2, 726-732, February 1998

SPECIAL COMMUNICATION
Electrical impedance tomography can monitor dynamic hyperinflation in dogs

Andy Adler1, Norihiro Shinozuka1, Yves Berthiaume2, Robert Guardo3 and Jason H. T. Bates1

1 Meakins-Christie Laboratories and Department of Biomedical Engineering, McGill University, H2X 2P2; 2 Centre de Recherche Hôtel-Dieu de Montréal and Departement de Médecine, Université de Montréal, H2W 1T8; and 3 Institut de Génie Biomédical, École Polytechnique de Montréal, Montreal, Quebec, Canada H3T 1J7

Adler, Andy, Norihiro Shinozuka, Yves Berthiaume, Robert Guardo, and Jason H. T. Bates. Electrical impedance tomography can monitor dynamic hyperinflation in dogs. J. Appl. Physiol. 84(2): 726-732, 1998.---We assessed in eight dogs the accuracy with which electrical impedance tomography (EIT) can monitor changes in lung volume by comparing the changes in mean lung conductivity obtained with EIT to changes in esophageal pressure (Pes) and to airway opening pressure (Pao) measured after airway occlusion. The average volume measurement errors were determined: 26 ml for EIT; 35 ml for Pao; and 54 ml for Pes. Subsequently, lung inflation due to applied positive end-expiratory pressure was measured by EIT (Delta VEIT) and Pao (Delta VPao) under both inflation and deflation conditions. Whereas Delta VPao was equal under both conditions, Delta VEIT was 28 ml greater during deflation than inflation, indicating that EIT is sensitive to lung volume history. The average inflation Delta VEIT was 67.7 ± 78 ml greater than Delta VPao, for an average volume increase of 418 ml. Lung inflation due to external expiratory resistance was measured during ventilation by EIT (Delta VEIT,vent) and Pes (Delta VPes,vent) and at occlusion by EIT (Delta VEIT,occl), Pes, and Pao. The average differences between EIT estimates and Delta VEIT,occl were 5.8 ± 44 ml for Delta VEIT,vent and 49.5 ± 34 ml for Delta VEIT,occl. The average volume increase for all dogs was 442.2 ml. These results show that EIT can provide usefully accurate estimates of changes in lung volume over an extended time period and that the technique has promise as a means of conveniently and noninvasively monitoring lung hyperinflation.

positive end-expiratory pressure; intensive care unit; imaging

The Journal of Applied Physiology 84(2):726-732
8750-7587/98 $5.00 Copyright © 1998 the American Physiological Society


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