Our hypothesis was that the relationship between the internal aortic diameter and the Doppler flow velocity across the aortic isthmus could be modeled by applying the principle of conservation of mass flow. The aortic diameter decreased at the isthmus by a mean of 18% (t = 11.02, p < 0.0001), while the flow velocity increased by a mean of 44% (t = 10.09, p < 0.0001). The mean peak mass flow rate was 34. 5 ml/s preisthmus and 32.9 ml/s at the isthmus with excellent correlation (r = 0.830). We conclude that the increase in Doppler velocity observed in the descending aorta can be explained by the normal narrowing observed at the aortic isthmus and application of the continuity equation for conservation of mass flow.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1159/000006911 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Third trimester fetal 4D flow MRI with motion correction.
Magn Reson Med
January 2025
Department of Radiology & Nuclear Medicine, Amsterdam University Medical Center, University of Amsterdam, Amsterdam, The Netherlands.
Purpose: To correct maternal breathing and fetal bulk motion during fetal 4D flow MRI.
Methods: A Doppler-ultrasound fetal cardiac-gated free-running 4D flow acquisition was corrected post hoc for maternal respiratory and fetal bulk motion in separate automated steps, with optional manual intervention to assess and limit fetal motion artifacts. Compressed-sensing reconstruction with a data outlier rejection algorithm was adapted from previous work.
Advances in the Treatment of Neonatal Coarctation of the Aorta.
Pediatrics
January 2025
Department of Pediatric Cardiology and Critical Care, Hannover Medical School, Hannover, Germany.
Coarctation of the aorta (CoA) is a potentially life-threatening congenital and obstructive anomaly of the distal aortic arch. After constriction of the ductus arteriosus, neonates may develop critical CoA in the isthmus area and present with severe left ventricular dysfunction or even cardiac failure. Low cardiac output and abdominal hypoperfusion (distal to the coarctation) may lead to metabolic derangements and clinical deterioration.
View Article and Find Full Text PDFA novel diagnostic model for fetal coarctation of the aorta with ventricular septal defect.
Int J Cardiol
December 2024
Department of Ultrasound Medicine, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China; Clinical Research Center for Medical Imaging in Hubei Province, Wuhan, China; Hubei Province Key Laboratory of Molecular Imaging, Wuhan, China. Electronic address:
Background: Our study aimed to develop a novel diagnostic model for fetal coarctation of the aorta with ventricular septal defect(CoA/VSD).
Methods And Results: We respectively included 70 fetuses with suspected CoA/VSD(January 2017-June 2023). After birth, 26 fetuses (26/47, 55.
[Bilateral Atrial Maze without Left Atrial Incision during Aortic Valve Replacement].
Kyobu Geka
November 2024
Department of Surgery, Saiseikai Yamaguchi Hospital, Yamaguchi, Japan.
A 77-year-old man had severe aortic stenosis and continuous atrial fibrillation. We performed maze procedure without left atrial incision( Dallas lesion set) during aortic valve replacement for this patient. Dallas lesion set alternates the isolation of mitral isthmus by connecting ablation line beneath left coronary cusp and noncoronary cusp commissure of the aortic valve with ablation from epicardial side of the upper left atrium.
View Article and Find Full Text PDFReliability of 4D Flow MRI for Investigation of Fetal Cardiovascular Hemodynamics in the Third Trimester.
Radiol Cardiothorac Imaging
December 2024
From the Departments of Radiology (E.K.E., T.F., M.L.M., L.P.B., A.J.B.), Pediatrics-Cardiology (R.M.F.), and Bioengineering (A.J.B.), University of Colorado Anschutz Medical Campus, 13123 E 16th Ave B125, Aurora, CO 80045; and Department of Radiology, Children's Hospital Colorado, Aurora, Colo (S.A.S., A.J.B.).
Article Synopsis
- The study aimed to establish reference values for fetal 4D flow MRI and assess its reliability in measuring blood flow in healthy fetuses and those with suspected aortic coarctation (CoA).
- Researchers conducted MRI scans on 34 pregnant patients, collecting data from both healthy fetuses and those with potential cardiovascular issues, analyzing the accuracy and consistency of the flow measurements obtained.
- The results indicated that fetal 4D flow MRI provides reliable hemodynamic measurements with high precision and repeatability, although it tends to underestimate blood flow compared to traditional 2D phase contrast MRI techniques.
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!