Showing papers on "Perfusion scanning published in 1974"

The Complementary Roles of Chest Radiography, Lung Scanning, and Selective Pulmonary Angiography in the Diagnosis of Pulmonary Embolism

Abstract: The chest X-ray, perfusion lung scan, and selective pulmonary arteriogram were independently reviewed in 104 patients with suspected pulmonary embolism. Thirteen patients also had 133Xe ventilation studies. Of the 45 patients with angiographically-documented pulmonary emboli, 37 had perfusion scans interpreted as high probability of pulmonary embolism (82% sensitivity). Fifty of 59 patients without angiographic evidence of pulmonary embolism had perfusion scans interpreted as low probability of pulmonary embolism, other, or normal (85% specificity). Of the 41 patients with acute pulmonary embolism, only three had normal chest X-rays. In 26 (63%) the abnormality on perfusion scan was more extensive than that on chest X-ray. When both the scan and chest X-ray pointed strongly in the same direction, a correct diagnosis could usually be made, and accuracy was greater than when diagnosis was based on the perfusion scan alone. The lung scan was of limited value in patients with cardiomegaly or left heart failur...

Radionuclide imaging of the circulatory distribution of membrane lung perfusion.

Abstract: Extracorporeal gas exchange with membrane lungs is increasingly used to provide supplementary gas exchange for patients with severe acute respiratory failure. It is of great importance to define the anatomical distribution of oxygenated blood delivered to the perfused subject in order to develop perfusion techniques for optimal delivery of oxygenated blood to vital organs such as the brain and heart. We examined changes in the distribution of extracorporeally oxygenated blood caused by independently altering the sites of arterial perfusion and the cardiac output. We studied blood distribution by radionuclide labelling and imaging in experimental lambs and in 3 patients perfused for severe acute respiratory failure. The information obtained allowed us to devise and test new methods of cannulation for better distribution of perfusion. (auth)

Coronary artery perfusion scanning with $sup 131$I-MAA injected directly into the coronary artery of congenital coronary anomalies

Abstract: 5μCi/Kg 131I-MAA was injected into the right coronary arteries in Cases 1, 2, and 3 under the diagnosis of right coronary artery fistula, and in Case 4 under the diagnosis of Bland-White-Garland syndrome. The results were compared with the angiocardiogram and right heart catheterization. When a fistula is small and cardiac cavity at the opening is not visualized by the angiocardiogram, coronary perfusion scanning successfully disclosed the location of fistula and influence of coronary circulation.

Coronary artery perfusion scanning with 131-I-MAA injected directly into the coronary artery of congenital coronary anomalies.

Abstract: 5μCi/Kg 131I-MAA was injected into the right coronary arteries in Cases 1, 2, and 3 under the diagnosis of right coronary artery fistula, and in Case 4 under the diagnosis of Bland-White-Garland syndrome. The results were compared with the angiocardiogram and right heart catheterization. When a fistula is small and cardiac cavity at the opening is not visualized by the angiocardiogram, coronary perfusion scanning successfully disclosed the location of fistula and influence of coronary circulation.