| Autor: |
Alderson PO, Doppman JL, Diamond SS, Mendenhall KG, Barron EL, Girton M |
| Jazyk: |
angličtina |
| Zdroj: |
Journal of nuclear medicine : official publication, Society of Nuclear Medicine [J Nucl Med] 1978 Feb; Vol. 19 (2), pp. 164-71. |
| Abstrakt: |
To determine the accuracy and limitations of Xe-133 ventilation and Tc-99m perfusion lung images (V-P images) in detecting pulmonary emboli (PE), these studies were performed in 23 dogs after experimental production of PE by a modified Wessler technique. Fourteen of the animals also underwent selective pulmonary angiography. Xenon-133 abnormalities were seen immediately after embolization in two of the 23 animals (8.7%). Perfusion images revealed the location of 83% of emboli that completely obstructed pulmonary vessels, but only 26% of those that partially obstructed flow. Defects were seen with 97% of emboli that completely occluded vessels larger than 2.0 mm in diameter, but in only 66% of those occluding smaller vessels. Oblique perfusion images provided the only evidence of the perfusion defect associated with five of 88 (5.7%) angiographically proven emboli. V-P imaging is a sensitive technique for detecting PE unless the emboli lodge in very small vessels or incompletely obstruct a vessel. Xenon-133 abnormalities occur infrequently following PE, and should not be a common cause for a false-negative V-P match in clinical practice. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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