[Does NMR provide information complementary to cardiac catheterization in aortic coarctation?]

Area of Science:

• Cardiovascular Imaging
• Medical Diagnostics
• Radiology

Background:

• Coarctation of the aorta is a congenital heart defect requiring accurate diagnostic methods.
• Cardiac catheterization has been the standard for assessing aortic coarctation severity.
• Non-invasive imaging modalities are sought to complement or replace invasive procedures.

Purpose of the Study:

• To evaluate the diagnostic accuracy of magnetic resonance imaging (MRI) for coarctation of the aorta.
• To compare MRI findings with cardiac catheterization measurements in patients with coarctation.
• To determine the reliability of MRI in assessing aortic stenosis and blood flow.

Main Methods:

• Retrospective analysis of 24 patients (aged 14 ± 4 years) with coarctation of the aorta.
• MRI investigations performed using a 1.5 tesla system (Siemens Vision).
• Comparison with retrograde cardiac catheterization, angiography, and pressure gradient measurements.

Main Results:

• No significant differences in aortic measurements between MRI (spin echo, gradient echo) and angiography.
• A slight correlation observed between MRI-measured stenosis degree and peak-to-peak hemodynamic gradient (r = 0.40).
• Signal loss at the aortic isthmus on MRI angiography correlated with the hemodynamic gradient (p = 0.04).

Conclusions:

• MRI is a reliable non-invasive technique for investigating coarctation of the aorta.
• MRI provides accurate morphological data and assesses blood flow in coarctation.
• MRI should be integrated into the diagnostic workup for coarctation of the aorta.