scholarly journals Time-Resolved Three-Dimensional Contrast-Enhanced Magnetic Resonance Angiography in Patients with Chronic Expanding and Stable Aortic Dissections

2017 ◽  
Vol 2017 ◽  
pp. 1-6 ◽  
Author(s):  
Michael Trojan ◽  
Fabian Rengier ◽  
Drosos Kotelis ◽  
Matthias Müller-Eschner ◽  
Sasan Partovi ◽  
...  
Keyword(s):  
Three Dimensional ◽  
False Lumen ◽  
Ascending Aorta ◽  
Stable Group ◽  
Time Resolved ◽  
Descending Aorta ◽  
Peak Intensity ◽  
Contrast Enhanced ◽  
Aortic Dissections

Objective. To prospectively evaluate our hypothesis that three-dimensional time-resolved contrast-enhanced magnetic resonance angiography (TR-MRA) is able to detect hemodynamic alterations in patients with chronic expanding aortic dissection compared to stable aortic dissections. Materials and Methods. 20 patients with chronic or residual aortic dissection in the descending aorta and patent false lumen underwent TR-MRA of the aorta at 1.5 T and repeated follow-up imaging (mean follow-up 5.4 years). 7 patients showed chronic aortic expansion and 13 patients had stable aortic diameters. Regions of interest were placed in the nondissected ascending aorta and the false lumen of the descending aorta at the level of the diaphragm (FL-diaphragm level) resulting in respective time-intensity curves. Results. For the FL-diaphragm level, time-to-peak intensity and full width at half maximum were significantly shorter in the expansion group compared to the stable group (p=0.027 and p=0.003), and upward and downward slopes of time-intensity curves were significantly steeper (p=0.015 and p=0.005). The delay of peak intensity in the FL-diaphragm level compared to the nondissected ascending aorta was significantly shorter in the expansion group compared to the stable group (p=0.01). Conclusions. 3D TR-MRA detects significant alterations of hemodynamics within the patent false lumen of chronic expanding aortic dissections compared to stable aortic dissections.

scholarly journals A life-threatening spontaneous ascending aortic rupture due to a small penetrating aortic ulcer

2021 ◽  
Vol 9 ◽  
pp. 2050313X2110377
Author(s):  
Yasuhito Nakamura ◽  
Kiyoshi Doi ◽  
Syojiro Yamaguchi ◽  
Etsuji Umeda ◽  
Osamu Sakai ◽  
...  
Keyword(s):  
Rare Case ◽  
Aortic Wall ◽  
Aortic Rupture ◽  
Ascending Aorta ◽  
Bleeding Site ◽  
Penetrating Aortic Ulcer ◽  
Postoperative Course ◽  
Life Threatening ◽  
Aortic Dissections

We reported a rare case of spontaneous frank rupture of a small (4 mm) penetrating aortic ulcer in the ascending aorta resulted in catastrophic bleeding. The ulcer only created a pinhole wound in the adventitia without saccular aneurysms, intramural hematomas, or aortic dissections. Notably, the wound could be directly closed because the aortic wall was intact only 5 mm away from the bleeding site. The postoperative course was uneventful, and the patient was discharged on the 11th postoperative day. After 8 months, follow-up computed tomography showed no abnormality of the aortic wall at the repair site.

Back-Table Modified Stent-Graft for Endovascular Repair of Ascending Aorta

2021 ◽  
pp. 152660282110282
Author(s):  
Juan Shi ◽  
Ligang Liu ◽  
Xiang Wei ◽  
Mingjia Ma
Keyword(s):  
Endovascular Repair ◽  
Survival Rates ◽  
Ascending Aorta ◽  
Cerebellar Infarction ◽  
Type Ia ◽  
Risk Patients ◽  
Aorta Replacement ◽  
Aortic Dissections ◽  
Event Rates

Objectives To investigate the effectiveness of modified stent-grafts (SGs) for the management of ascending aortic pathologies. Materials and Methods From January 2015 to December 2019, 31 individuals were treated by ascending aortic endovascular repair with a back-table modified SG for acute (n=4) or chronic (n=1) type A aortic dissections, penetrating aortic ulcers (n=18), pseudoaneurysms (n=2), anastomotic fistula (n=1), and endoleaks after thoracic endovascular aortic repair (TEVAR) (n=5). The commercially available thoracic aortic SGs were modified with a fenestration or truncation technique on the back-table according to aortography during the operation. Results The 30-day mortality and aorta-related mortality rates were 12.9% and 6.5%, respectively. There were 2 strokes, 3 respiratory insufficiencies, and 6 endoleaks during hospitalization. During a mean follow-up of 28.8±16.6 months, the overall survival rates at 1 year and 3 years were both 80.6%. Free from adverse event rates at 1 year and 3 years were 88.9% and 84.7%, respectively. There were 2 deaths during follow-up: One patient died of cachexia 1 month after discharge, and the other patient died of acute myocardial infarction 3 months after discharge. One patient with a pseudoaneurysm underwent open ascending aorta replacement 3 months after discharge for a type Ia endoleak. Another patient suffered from cerebellar infarction 17 months after discharge. Conclusion The modified SG for endovascular repair of the ascending aorta is a practicable alternative and presents acceptable outcomes in high-risk patients.

Impact of fetal haemodynamics on surgical and neurodevelopmental outcomes in patients with Ebstein anomaly and tricuspid valve dysplasia

2022 ◽  
pp. 1-12
Author(s):  
Min Bao ◽  
Edgar Jaeggi ◽  
Liqun Sun ◽  
Fu-Tsuen Lee ◽  
Renee Sananes ◽  
...  
Keyword(s):  
Tricuspid Valve ◽  
Motor Skills ◽  
Umbilical Vein ◽  
Brain Mri ◽  
Ascending Aorta ◽  
Neurodevelopmental Outcomes ◽  
Ebstein Anomaly ◽  
Descending Aorta ◽  
Neurodevelopmental Delay

Abstract Objectives: To evaluate the impact of fetal haemodynamics on surgical and neurodevelopmental outcomes in severe Ebstein anomaly and tricuspid valve dysplasia. Methods: Thirty-four fetuses with Ebstein anomaly/tricuspid valve dysplasia were referred from 2013 to 2019 for fetal echocardiography and clinical management. Nineteen fetuses with Ebstein anomaly/tricuspid valve dysplasia and 30 controls underwent cardiovascular magnetic resonance to quantify the fetal blood flow and to calculate cerebral oxygen delivery (cDO2) and consumption (cVO2). The 3D steady-state free precession acquisition was used to measure fetal brain volume. Surgical outcome, brain MRI, and neurodevelopmental follow-up were reviewed. Results: Twenty-six fetuses were live born (76%) and survival (65%) at a mean follow-up of 4 years. Nine fetuses had a brain MRI before discharge, and all had clinically silent injuries and volume loss. At 18 months, five single-ventricle patients had a neurodevelopmental delay in cognition and language (mean percentile: 11th), with gross-motor skills more affected than fine-motor skills (mean percentiles: 4th and 34th). Fetuses with Ebstein anomaly/tricuspid valve dysplasia had smaller brains, lower combined ventricular output, ascending aorta, superior caval vien and umbilical vein flows, lower oxygen saturation in ascending aorta and superior caval vien, lower cDO2 and cVO2 (p < 0.05). Superior caval vien/combined ventricular output and descending aorta/combined ventricular output ratios were lower in fetuses with circular shunt (p < 0.05). Fetuses requiring the Starnes procedure tended to have smaller brains, lower combined ventricular output, superior caval vien, descending aorta, and umbilical vein flows. Conclusions: All patients with Ebstein anomaly/tricuspid valve dysplasia are at high risk of neurodevelopmental delay and warrant follow-up. Fetal cardiovascular magnetic resonance revealed impaired brain growth with diminished cerebral blood flow and cDO2, the extenting dependent on the severity of the haemodynamic compromise.

Low-dose contrast-enhanced time-resolved MR angiography at 3T: Diagnostic accuracy for treatment planning and follow-up of vascular malformations

2011 ◽  
Vol 66 (12) ◽  
pp. 1181-1192 ◽  
Author(s):  
M. Anzidei ◽  
B. Cavallo Marincola ◽  
A. Napoli ◽  
L. Saba ◽  
F. Zaccagna ◽  
...  
Keyword(s):  
Diagnostic Accuracy ◽  
Treatment Planning ◽  
Mr Angiography ◽  
Low Dose ◽  
Vascular Malformations ◽  
Time Resolved ◽  
Contrast Enhanced

Time-resolved Three-dimensional Contrast-enhanced MR Angiography of the Peripheral Vessels

Radiology ◽  
2002 ◽  
Vol 225 (1) ◽  
pp. 43-52 ◽  
Author(s):  
J. Shannon Swan ◽  
Timothy J. Carroll ◽  
Todd W. Kennell ◽  
Dennis M. Heisey ◽  
Frank R. Korosec ◽  
...  
Keyword(s):  
Mr Angiography ◽  
Three Dimensional ◽  
Time Resolved ◽  
Contrast Enhanced

Evaluation of U-Net Based Architectures for Automatic Aortic Dissection Segmentation

2022 ◽  
Vol 3 (1) ◽  
pp. 1-16
Author(s):  
Bradley Feiger ◽  
Erick Lorenzana-Saldivar ◽  
Colin Cooke ◽  
Roarke Horstmeyer ◽  
Muath Bishawi ◽  
...  
Keyword(s):  
Average Distance ◽  
Three Dimensional ◽  
False Lumen ◽  
Dice Similarity Coefficient ◽  
True Lumen ◽  
Content Type ◽  
Segmentation Accuracy ◽  
Upward Direction ◽  
Aortic Dissections ◽  
High Degree

Segmentation and reconstruction of arteries is important for a variety of medical and engineering fields, such as surgical planning and physiological modeling. However, manual methods can be laborious and subject to a high degree of human variability. In this work, we developed various convolutional neural network ( CNN ) architectures to segment Stanford type B aortic dissections ( TBADs ), characterized by a tear in the descending aortic wall creating a normal channel of blood flow called a true lumen and a pathologic channel within the wall called a false lumen. We introduced several variations to the two-dimensional ( 2D ) and three-dimensional (3 D ) U-Net, where small stacks of slices were inputted into the networks instead of individual slices or whole geometries. We compared these variations with a variety of CNN segmentation architectures and found that stacking the input data slices in the upward direction with 2D U-Net improved segmentation accuracy, as measured by the Dice similarity coefficient ( DC ) and point-by-point average distance ( AVD ), by more than 15\% . Our optimal architecture produced DC scores of 0.94, 0.88, and 0.90 and AVD values of 0.074, 0.22, and 0.11 in the whole aorta, true lumen, and false lumen, respectively. Altogether, the predicted reconstructions closely matched manual reconstructions.

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