In chronic PE, pulmonary angiography is used for surgical planning prior to pulmonary endarterectomy. CT pulmonary angiography (CTPA) will show filling defects within the pulmonary vasculature with acute pulmonary emboli. Ventilation–perfusion (V/Q) scintigraphy has a high sensitivity to detect embolic disease but its value has been challenged with the emergence of multidetector CT pulmonary angiography (CTPA). Computed tomography pulmonary angiography (CTPA) is currently the first line imaging technique as recommended by guidelines in the diagnosis of patients with suspected pulmonary embolism (PE) [1,2]. CT pulmonary angiogram (CTPA) is a medical diagnostic test that employs computed tomography (CT) angiography to obtain an image of the pulmonary arteries.Its main use is to diagnose pulmonary embolism (PE). Wells and revised Geneva scores are commonly used probability scales in PTE diagnosis. When used with conventional pulmonary angiography, CTPA helps show the extent of disease and can contribute to operability assessment. 241 Since the development of multidetector CTPA, the sensitivity and specificity have increased to 83% to 94% and 94% to 100%, respectively. Diagnostic algorithms using either CTPA or V/Q scanning have proven to be comparably safe to exclude the diagnosis of pulmonary embolism. Computed tomography (CT) pulmonary angiography (CTPA) has become the first-line imaging modality tool to study patients suspected of having pulmonary embolism (PE). She has no hemoptysis or clinical signs or symptoms of deep venous thrombosis (DVT). Sub-group analysis was performed by using the Fisher exact test. 8,9 Despite concerns about low sensitivity of CTPA (reported between 53% and 100%), its adoption has been rapid. It is often believed to be overutilised with few recent studies showing a yield of less than 2%. INTRODUCTION
CTPA was introduced in the 1990s as an alternative to ventilation/perfusion scanning, which relies on radionuclide imaging of the blood vessels of the lung. This phantom study investigated the effects of patient shielding and scan length reduction on the fetal and maternal ionising radiation dose from CTPA. The overall success of the procedure is graded on restoration of both pulmonary arterial and venous flow. CTPA is more often definitive than pulmonary scintigraphy, and CTPA may also disclose causes of hypoxemia other than pulmonary embolism. This study aimed to determine the overall positivity rate of CTPA examinations and understand the factors that affect the yield of the CTPA examination. BACKGROUND: The assessment of clinical guideline adherence for the evaluation of pulmonary embolism (PE) via computed tomography pulmonary angiography (CTPA) currently requires either labor-intensive, retrospective chart review or prospective collection of PE risk scores at the time of CTPA … graphic pulmonary angiography (CTPA) was introduced as an alterna-tive noninvasive test to diagnose pul-monary embolism.8,9 Despite concerns about low sensitivity of CTPA (re-ported between 53% and 100%), its adoption has been rapid.10,11 Clini-cians have been attracted to CTPA use Spiral computed tomography pulmonary angiography (CTPA) is the most frequently used imaging modality for detecting PE in modern clinical practice. From March 14 to April 6, 2020, 72 non-hospitalized patients referred by the emergency department to CTPA for COVID-19 pneumonia were retrospectively identified. CT generates ionising radiation, and thus, abdominal shielding may be used. 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