How are ventilation perfusion scans utilized in patients who have had lung transplantation?
In the immediate postoperative period, the V/Q scan can be useful to assess the transplanted lung for overall function. V/Q scans can also be useful to assess for pulmonary emboli in the transplanted lung and to assess for worsening function that may be attributable to transplant rejection or infection. Although the exact findings are nonspecific, transplant rejection can result in small perfusion defects associated with the small vessel abnormalities typically found in rejection. Worsening lung ventilation and perfusion can also be observed in transplant patients who develop bronchiolitis obliterans even though the chest radiograph may be unremarkable.