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Morphometric analysis of aortic coarctation: determination of the target vessel diameter required to relieve the
Atsuhito Takeda1, Tomoaki Murakami
1Department of Pediatrics, Hokkaido University, Graduate School of Medicine, Sapporo, Japan. a-takeda@med.hokudai.ac.jp
Insights
Aortic coarctation (CoA) patients with a cross-sectional area (CSA) of 81 mm2/m2 can relieve pressure gradients. This morphometric data aids in catheter interventions and surgical planning for CoA.
Area of Science:
- Cardiovascular Medicine
- Pediatric Cardiology
- Interventional Cardiology
Background:
- Precise morphometric data for relieving transcatheter pressure gradients in aortic coarctation (CoA) are not well-established.
- Understanding these metrics is crucial for effective treatment planning.
Purpose of the Study:
- To determine the specific morphometric parameters of the aortic arch associated with the relief of transcatheter pressure gradients in patients with CoA.
- To identify a reliable cutoff value for intervention guidance.
Main Methods:
- Collected 29 morphometric data points from CoA patients, including body surface area (BSA)-adjusted diameter and cross-sectional area (CSA) via intravascular ultrasound.
- Measured transcatheter peak-to-peak pressure gradients using a manometer-tipped catheter.
- Utilized linear regression and receiver-operating characteristic (ROC) curve analysis to correlate morphometrics with pressure gradients.
Main Results:
- BSA-adjusted narrowest cross-sectional area (CSA) showed the strongest correlation with pressure gradients (r=0.92, p=0.0002).
- ROC analysis identified a CSA cutoff of 81 mm2/m2 as highly predictive of pressure gradient relief.
- This cutoff demonstrated 100% sensitivity and 100% specificity.
Conclusions:
- A CSA of 81 mm2/m2 (equivalent to approximately 10 x BSA^0.5 mm diameter) is identified as the threshold for relieving pressure gradients in CoA.
- These findings offer valuable quantitative data for guiding catheter interventions and surgical approaches in aortic coarctation.
Background:
Little is known about the precise morphometric data of the aortic arch at which the transcatheter pressure gradient is relieved in patients with aortic coarctation (CoA).
Methods And Results:
Twenty-nine morphometric data were obtained from patients with CoA including the body surface area (BSA) adjusted angiographic diameter of the narrowest vessel, the ratio of the angiographic diameter to that of the descending aorta and BSA-adjusted narrowest cross-sectional area (CSA) using intravascular ultrasound imaging. The transcatheter peak-to-peak pressure gradient of the aortic arch was measured using a manometer tipped catheter. A linear regression analysis showed CSA to have the strongest correlation with the pressure gradient (r=0.92, p=0.0002) among any pressure gradient group (n=10). A receiver-operating characteristic curve (ROC) analysis was performed to determine the morphometric cut-off point at which the pressure gradient occurs. CSA had the highest areas under the ROC (1.0) and the cut-off point of 81 mm2/m2 showed a sensitivity of 100% and specificity of 100% to predict the relief of a pressure gradient.
Conclusions:
In patients with CoA, the vessel size that can relieve a pressure gradient is a CSA of 81 mm2/m2 (10 x BSA0.5 mm in diameter). This data may provide useful information for catheter intervention and surgery.
