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Author Spotlight: Using Point-of-Care Ultrasound for Comprehensive Evaluation of the Abdominal Aorta
Published on: September 8, 2023
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Imaging features of renal malperfusion in aortic dissection
Pieter A J van Bakel1,2, Matthew Henry3, Karen M Kim1
1Department of Cardiac Surgery, University of Michigan, Ann Arbor, MI, USA.
Summary
Computed tomography angiography shows kidney enhancement differences in aortic dissection patients. While predictive, imaging alone doesn't confirm renal malperfusion, necessitating invasive assessment for diagnosis.
Area of Science:
- Cardiovascular Imaging
- Vascular Surgery
- Renal Physiology
Background:
- Aortic dissection can lead to malperfusion syndrome, significantly increasing mortality.
- Asymmetric renal enhancement on CT angiography is a suspected indicator of renal malperfusion.
- Accurate diagnosis of renal malperfusion is critical for timely intervention and improved outcomes.
Purpose of the Study:
- To investigate the association between renal enhancement patterns on CT angiography and confirmed renal malperfusion in patients with aortic dissection.
- To evaluate the diagnostic accuracy of CT angiography findings for renal malperfusion.
- To identify predictors of renal malperfusion in this patient population.
Main Methods:
- Retrospective cohort study of patients with acute aortic dissection and suspected visceral malperfusion (2010-2020).
- Renal enhancement assessed via visual inspection and quantitative density measurements of the renal cortex on CT angiography.
- Invasive renal artery pressures obtained during angiography used as the gold standard for diagnosing renal malperfusion.
- Logistic regression analysis to determine independent predictors of renal malperfusion.
Main Results:
- 161 patients analyzed; 83% had confirmed renal malperfusion via invasive angiography.
- Asymmetric renal enhancement on CT angiography was observed in 42% of patients without malperfusion.
- Both global (OR 4.43) and focal (OR 11.23) enhancement defects were independent predictors of renal malperfusion.
- Asymmetric renal enhancement demonstrated 65% sensitivity and 58% specificity for renal malperfusion.
Conclusions:
- Differential renal enhancement on CT angiography is predictive but not definitive for renal malperfusion in aortic dissection.
- CT angiography is a valuable tool for detecting potential renal malperfusion.
- Definitive diagnosis of renal malperfusion requires invasive assessment and close clinical monitoring.
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