The medical records of 33 consecutive patients who successfully underwent pulmonary thromboendarterectomy at the University of California at San Diego Medical Center (UCSD) for chronic thromboembolic pulmonary hypertension between 1985 and 1988 and who met the following criteria were reviewed: (1) a standard six-view (anterior, posterior, right posterior oblique, left posterior oblique, right lateral, and left lateral) lung perfusion scan (3 mCi of technetium-labeled MAA, 500,000 counts per image) and a xenon ventilation scan had been obtained preoperatively and before hospital discharge (two to three weeks after surgery); 2) right heart catheterization data and a pulmonary angiogram had been obtained at UCSD preoperatively; (3) complete hemodynamic data were obtained during postoperative monitoring; the values provided are those obtained on the third or fourth postoperative day; (4) one of the authors was in the operating room at the time of surgery, reviewed the thrombus specimens and, with the surgeon, recorded the vessels entered at thromboendarterectomy. proventil inhaler
The lung perfusion scans were analyzed in the following manner. Using an anatomically derived template (Fig 1), the overall perfusion image in each projection was divided according to the template bronchopulmonary segmental boundaries.
Figure 1. Anterior (left) and posterior (right) views of perfusion scan template that demonstrates the normal
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