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Am. J. Respir. Crit. Care Med., Vol 154, No. 2, 08 1996, 491-496.

Unilateral pulmonary artery thrombotic occlusion: is distal arteriopathy a consequence?

AM Hirsch, KM Moser, WR Auger, RN Channick and PF Fedullo
Department of Medicine, University of California, San Diego, USA.

The characteristics and postoperative outcomes of a unique group of eleven patients with total unilateral pulmonary artery (PA) thromboembolic occlusion were compared with those of some 400 patients who underwent bilateral thromboendarterectomies during the same time period. Preoperative historical, physical, and laboratory features and postoperative outcomes of these two groups were analyzed. The unilateral group had no distinct historical features. However, they were younger (32 +/- 10 yr) than the bilateral group (51 +/- 15 yr), dominantly female (10 of 11) versus a male predominance (62%) in the bilateral group; had significantly lower preoperative PA mean pressures (30 +/- 12 versus 46 +/- 12 mm Hg) and calculated pulmonary vascular resistance (360 +/- 293 versus 901 +/- 467 dynes/s/cm-5); and small lung by chest radiograph was common (8 of 11). Postoperatively, four unilateral patients developed unilateral rethrombosis (two immediate; two late, at several years postsurgery); this occurred in only one bilateral patient. Furthermore, of six patients with unilateral occlusion present more than 1 yr, reperfusion was poor in four despite an adequate thromboendarterectomy in all. Postoperative pulmonary angiograms in two of these disclosed apparent atrophy of central and distal pulmonary arteries. Prior animal investigation models indicate that unilateral PA occlusion is followed by development of a postobstructive arteriopathy in the resistance arteries of the occluded lung. The unusual outcomes in these 11 patients suggest that they may develop a similar arteriopathy which requires special management considerations at surgery and postoperatively.


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