title: False-positive lung imaging: inadvertent injection into a pulmonary artery catheter.
abstract: A case of a ventilation-perfusion mismatch seen post-operatively in a patient with chest pain is reported. There was absence of perfusion to the right lung, with relatively normal ventilation. The study was initially interpreted as indicating a high probability of pulmonary embolus. It was then discovered that the injection had been inadvertently made into a Swan-Ganz catheter, with its tip in the left main pulmonary artery. The mismatch was therefore iatrogenic and not related to pulmonary embolus. The false-positive lung imaging which resulted has not been previously reported in the literature.
mesh_terms: D000368:Aged; D000418:Albumins / Q000008:administration & dosage; D002404:Catheterization; D005189:False Positive Reactions; D005260:Female; D006801:Humans; D007049:Iatrogenic Disease / Q000000981:diagnostic imaging* / Q000209:etiology; D007267:Injections / Q000009:adverse effects*; D008168:Lung / Q000000981:diagnostic imaging*; D011655:Pulmonary Embolism / Q000000981:diagnostic imaging*; D011877:Radionuclide Imaging; D013667:Technetium / Q000008:administration & dosage; D014692:Ventilation-Perfusion Ratio
chemical_list: D000418:Albumins; D013667:Technetium