Endobronchial valves are one-way valves that restrict airflow to a particular lung segment. The devices are inserted via bronchoscopy. They permit the drainage of airway secretions during the expiratory phase but restrict incoming airflow during inspiration 1.
They were originally designed as an alternative to surgery for lung volume reduction in cases of severe emphysema. They have also been used to treat bronchopleural and bronchoalveolar fistulas with persistent air-leaks 1,2.
The most popular device is the Spiration Intrabronchial Valve System®. The device is MR conditional at 1.5T and 3T 2.
Small radio-opaque markers and struts overlying an airway will be visible. Atelectasis distal to the valve should usually also be visible 3.
Potential complications include 3:
- 1. Mahajan AK, Doeing DC, Hogarth DK. Isolation of persistent air leaks and placement of intrabronchial valves. (2013) The Journal of thoracic and cardiovascular surgery. 145 (3): 626-30. doi:10.1016/j.jtcvs.2012.12.003 - Pubmed
- 2. Sigakis CJG, Mathai SK, Suby-Long TD, Restauri NL, Ocazionez D, Bang TJ, Restrepo CS, Sachs PB, Vargas D. Radiographic Review of Current Therapeutic and Monitoring Devices in the Chest. (2018) Radiographics : a review publication of the Radiological Society of North America, Inc. 38 (4): 1027-1045. doi:10.1148/rg.2018170096 - Pubmed
- 3. Liu H, Xu M, Xie Y, Gao J, Ni S. Efficacy and safety of endobronchial valves for advanced emphysema: a meta analysis. (2015) Journal of thoracic disease. 7 (3): 320-8. doi:10.3978/j.issn.2072-1439.2014.11.04 - Pubmed