An experimental model for total inversion of left lung circulation was developed. Using this model we will demonstrate that it is possible to reverse all the pulmonary circulation and that the lung remains functionally as well as morphologically normal. Circulation of the left lung was reversed in eight dogs. The blood from the pulmonary trunk was diverted to the pulmonary veins, and the return from the pulmonary artery to the left atrium. The dogs were reoperated after 15 days for a new analysis. In order to monitor the flow through the reversed system we performed an echocardiogram with color Doppler on the 9th post operative day. We used blood gas analysis from the aorta and the pulmonary artery to study the function status of this lung in the first and the second operation. The morphologic pattern was studied by comparing two biopsies of the lung, one before and one after the reversed flow. The results of blood gas analysis showed no significant difference between the samples of the aorta and pulmonary artery. The echocardiogram with color Doppler was a reliable method to study the inverted circulation. The histological study was able to demonstrate no difference in the morphology of the lung after the reversed circulation. It was possible to reverse all the left lung circulation. Functionally and morphologically the lung continued with its normal state.
Pulmonary circulation; Lung citology; Lung
