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Magnetic Resonance Imaging (MRI) and Ventilation Perfusion Scans are two radiological investigations that offer detailed diagnostic images of the body, particularly lung structures.
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Association between pre-treatment computed tomography findings and post-treatment persistent decrease in lung

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Proximal thrombi in acute pulmonary embolism (PE) are linked to more residual hypoperfused lung segments after treatment. Careful follow-up is crucial for these patients to monitor lung perfusion blood volume (LPBV).

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Area of Science:

  • Radiology
  • Pulmonary Medicine
  • Medical Imaging

Background:

  • Acute pulmonary embolism (PE) poses significant risks, and understanding post-treatment outcomes is vital.
  • Residual hypoperfusion after treatment can impact patient prognosis and requires accurate assessment.

Purpose of the Study:

  • To correlate pre-treatment computed tomography (CT) findings with residual hypoperfused segments in lung perfused blood volume (LPBV) post-treatment for acute PE.
  • To identify specific imaging predictors of incomplete perfusion recovery.

Main Methods:

  • Dual-energy CT scans were analyzed from 91 acute PE patients before and after treatment.
  • Pre-treatment CT pulmonary angiography (CTPA) assessed thrombus location (proximal/distal) and pulmonary artery patency (occlusive/non-occlusive).
  • Residual hypoperfusion was defined as perfusion deficits present on both pre- and post-treatment LPBV maps.

Main Results:

  • Segment-based analysis revealed significantly higher residual hypoperfusion in proximal thrombus cases (26.4%) compared to peripheral ones (10.3%; P=0.004).
  • Patient-based analysis confirmed a higher proportion of residual hypoperfusion in patients with proximal thrombi (38.1%) versus others (12.0%; P=0.022).
  • Pre-treatment pulmonary artery patency did not show a significant association with residual hypoperfusion (P>0.05).

Conclusions:

  • Proximal thrombus location is a significant predictor of residual hypoperfusion in acute PE patients post-treatment.
  • Vascular patency on initial CTPA is not a reliable indicator of perfusion recovery.
  • Enhanced vigilance and follow-up are recommended for patients presenting with proximal thrombi to manage potential persistent lung hypoperfusion.