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Pulmonary embolism (PE) occurs when a thrombus, fat or air embolus, amniotic fluid, or tumor tissue blocks one or more pulmonary arteries. These blockages originate in the venous system or the right side of the heart.EtiologyPE primarily arises from deep vein thrombosis (DVT) and other hypercoagulable states, such as inherited thrombophilias. Additional etiological factors include venous stasis, commonly seen in obesity, and endothelial injury from surgery and trauma. Less common causes include...
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Diagnosing Pulmonary EmbolismDiagnosing pulmonary embolism (PE) involves clinical assessment and advanced imaging tests. The preferred diagnostic tool is the spiral (helical) CT scan or CT angiography (CTA), which uses intravenous contrast media to visualize the pulmonary vasculature and identify emboli.A ventilation-perfusion (V/Q) scan is an alternative for patients unable to receive contrast media. This scan includes both perfusion and ventilation scanning. Perfusion scanning involves...
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The key difference between Superficial Vein Thrombosis (SVT) and Deep Vein Thrombosis (DVT) lies in their location and severity.Clinical ManifestationsSVT typically presents with localized pain, tenderness, and redness along the course of a superficial vein, often accompanied by a palpable, cord-like structure under the skin. This condition is usually less dangerous than DVT but can be uncomfortable and may lead to complications such as cellulitis or, rarely, a clot extension into the deep...
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Contrast Reflux Into IVC in Acute Pulmonary Embolism Predicts Clinical Deterioration Risk.

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Summary

Contrast reflux into the inferior vena cava during pulmonary embolism indicates higher clinical risk. This finding, using the National Early Warning Score, highlights a significant correlation in acute pulmonary embolism patients.

Keywords:
National Early Warning Scorecomputed tomography pulmonary angiograminterobserver reliabilityprognosticationvenous thromboembolism

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Area of Science:

  • Radiology and Imaging
  • Cardiovascular Medicine
  • Critical Care Medicine

Background:

  • Contrast reflux into the inferior vena cava (IVC) during computed tomography pulmonary angiogram (CTPA) is a known mortality risk factor in acute pulmonary embolism (PE).
  • Clinical risk stratification in acute PE is crucial for patient management and outcomes.

Purpose of the Study:

  • To determine if contrast reflux into the IVC correlates with objective clinical risk scores in patients with acute PE.
  • To assess the relationship between the severity of IVC contrast reflux and the risk of clinical deterioration.

Main Methods:

  • Retrospective analysis of adult patients diagnosed with acute PE via CTPA.
  • Contrast reflux into the IVC was graded on a 4-point scale.
  • Correlation between reflux severity and the National Early Warning Score (NEWS) was analyzed.

Main Results:

  • A significant correlation was found between the extent of IVC contrast reflux and NEWS (Spearman's ρ = 0.2932, p = 0.028).
  • Patients with grade 3 reflux exhibited significantly higher NEWS compared to those with grades 0 or 1.
  • Simplified grading (contrast above vs. below diaphragm) improved interobserver reliability while maintaining the correlation with clinical risk.

Conclusions:

  • Contrast reflux into the IVC during acute PE is associated with an increased risk of clinical deterioration, as indicated by elevated NEWS.
  • The degree of contrast reflux serves as a valuable imaging biomarker for risk stratification in acute PE.
  • A simplified grading system for IVC contrast reflux enhances reliability in clinical practice.