BRONCHIAL ARTERIAL COLLATERAL CIRCULATION - EFFECT OF EXPERIMENTAL LIGATION OF PULMONARY ARTERY AND SUBSEQUENT REANASTOMOSIS

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Abstract
Following ligation of the pulmonary artery, the bronchial arterial collaterals on the side of the ligated vessel become greatly expanded. This expansion is accompanied by the development of small precapillary communications between the 2 systems in the periphery of the lung. Although these changes develop progressively and reach a peak in 18 months to 2 years, most of the increase in collateral occurs within 3 months following the ligation of the pulmonary artery. These changes, previously described, were again confirmed by the control animals herein reported. The present study was undertaken to determine the long-term fate of expanded bronchial arterial collaterals following surgical restoration of continuity in the ligated pulmonary vessel and to determine the immediate effect of reanastomosis of the pulmonary artery on the pattern of bronchial blood flow. The observation in the present study demonstrate the following Experimentally induced bronchial collaterals will revert to normal provided the lumen of the reunited pulmonary artery is approximately the same size as that of the opposite pulmonary artery; marked narrowing at the site of reanastomosis of the pulmonary artery will result in persistence of the bronchial arterial collaterals; the pressure transmitted across the anastomotic bridge of the bronchial pulmonary artery is insufficient to cause reversed filling of the pulmonary artery after continuity of the artery has been restored. This was shown by angiocardiography and bronchial arteriography.

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