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CTPA was introduced in the 1990s as an alternative to ventilation/perfusion scanning (V/Q scan), which relies on radionuclide imaging of the blood vessels of the lung. It is regarded as a highly sensitive and specific test for pulmonary embolism. [1] CTPA is typically only requested if pulmonary embolism is suspected clinically.
The pulmonary artery pressure (PA pressure) is a measure of the blood pressure found in the main pulmonary artery. This is measured by inserting a catheter into the main pulmonary artery. [ 13 ] : 190–191 The mean pressure is typically 9–18 mmHg, [ 14 ] and the wedge pressure measured in the left atrium may be 6–12 mmHg.
Selective pulmonary angiogram revealing significant thrombus (labelled A) causing a central obstruction in the left main pulmonary artery. Pulmonary angiography (or pulmonary arteriography,conventional pulmonary angiography, selective pulmonary angiography) is a medical fluoroscopic procedure used to visualize the pulmonary arteries and much less frequently, the pulmonary veins.
CT angiography should not be used to evaluate for pulmonary embolism when other tests indicate that there is a low probability of a person having this condition. [5] A D-dimer assay might be a preferred alternative to test for pulmonary embolism, and that test and a low clinical prediction score on the Wells test or Geneva score can exclude ...
Digital subtraction angiography (DSA) is a fluoroscopy technique used in interventional radiology to clearly visualize blood vessels in a bony or dense soft tissue environment. Images are produced using contrast medium by subtracting a "pre-contrast image" or mask from subsequent images, once the contrast medium has been introduced into a ...
Pulmonary angiography is used to visualise the anatomy of pulmonary vessels. Pulmonary angiography may be used during embolization of pulmonary arteriovenous malformations. [10] In addition, pulmonary angiography may be performed during treatment of pulmonary embolisms. [11]
Pulmonary bay is a medical term which describes a finding on the chest radiograph. In pulmonary bay, there is a concavity where you would normally find the pulmonary artery . Pulmonary bay is most commonly associated with tetralogy of Fallot , however it may also be seen in other conditions where there is a reduced outflow from the pulmonary ...
It refers to the dilatation and abrupt change in calibre of a previously normal descending pulmonary artery on a chest X-ray film. [1] Chang sign usually appears within 24 hours of the onset of chest pain due to pulmonary embolism, [ 2 ] and the maximal dilatation of the descending pulmonary artery often occurs in two to three days after the ...