Predictive value of perfusion defects on dual energy CTA in the absence of thromboembolic clots

Richard A.P. Takx, Thomas Henzler, U. Joseph Schoepf, Thomas Germann, Stefan O. Schoenberg, Aysel Shirinova, Ralf W. Bauer, Claudia Frellesen, Long Jiang Zhang, John W. Nance, Christian Fink, Paul Apfaltrer

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

Background To determine the predictive value of volumetrically measured lung perfusion defects (PDvol) and right ventricular dysfunction on dual-energy computed tomography angiography (DE-CTA) for predicting all cause mortality in patients suspected of pulmonary embolism (PE) but without evident thromboembolic clot on CTA. Methods 448 patients underwent DE-CTA on a 64-channel DSCT system between January 2007 and December 2012 for suspected PE, of which 115 were without detectable thromboembolic clot on CTA. Diagnostic performance for identifying patients at risk of dying was evaluated using ROC analysis. All-cause mortality was assessed via the hospital electronic medical records and/or consultation of the patient or the patient's primary care physician via phone call interviews. Sensitivity, specificity, positive likelihood ratio, negative likelihood ratio and area under the curve (AUC) were determined for PDvol (volume of perfusion defects/total lung volume), transverse right ventricular to left ventricular diameter ratios (RV/LV) and for the combination of both tests. Results Mortality was 38% within the investigated time period of 6 months. Patients who died had significantly higher PDvol (PDvol 28 ± 13% vs. 19 ± 12%, p < 0.001) and a non-significant difference in transverse RV/LV ratio (1.14 ± 0.37 vs. 1.06 ± 0.22, p = 0.159). The AUC was 0.71 for PDvol, 0.53 for RV/LV ratio, and 0.67 for the combination of PDvol and RV/LV ratio. PDvol remained a significant predictor after correcting for age. Conclusions In the absence of thromboembolic clots, PDvol at DE-CTA appears to be predictive for all cause mortality.

Original languageEnglish (US)
Pages (from-to)183-187
Number of pages5
JournalJournal of cardiovascular computed tomography
Volume11
Issue number3
DOIs
StatePublished - May 2017

Keywords

  • Dual energy CT
  • Multidetector computed tomography
  • Pulmonary embolism
  • ROC curve
  • Right
  • Risk assessment
  • Ventricular dysfunction

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Cardiology and Cardiovascular Medicine

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