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. 2020 Jun 9;15:1325–1334. doi: 10.2147/COPD.S242210

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© 2020 Klooster et al.

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Measurement of collateral flow with Chartis. (A) and (B) Collateral flow over the left major fissure (red) is measured by a balloon occluding the entrance of the left lower lobe (A) or the left upper lobe (B). (C) Collateral flow over the right upper lobe fissure is measured in the right upper lobe. This fissure consists of the minor fissure and a part of the right major fissure (red). (D) Collateral flow over the right major fissure (red) is measured by a balloon occluding the entrance of the right lower lobe. If this is unsuccessful, (E) collateral flow can be measured in the right upper lobe while the middle lobe is also occluded with a Fogarty balloon or a Watanabe spigot (green).