Magnetic Resonance Imaging in the Evaluation of Valvular Prosthetic Function
Following patients with prosthetic valve replacement is quite difficult. Indeed, fibrosis, calcification and tearing of the leaflet are probably the fate of most bioprosthetic valves after 10 years. Separating valve dysfunction from other causes of symptoms, such as diminished left ventricular contractility, coronary arterial disease and pulmonary disease may be difficult. Catheterization is frequently different and risks are reported. Nowadays, the echo color Doppler is much more reliable even when the metallic structures in the mechanical valve cause echo reflections and shadowing which mask events distal to the struts. Therefore, detection of thrombus or vegetation around the metallic struts is not easy.
KeywordsLeakage Flow Disc Prosthesis Mechanical Prosthesis Cine Magnetic Resonance Aortic Valve Prosthesis
Unable to display preview. Download preview PDF.
- 1.Persson BRR, Stahlberg F (1989) Health and safety of clinical NMR examinations. CRC, Boca Raton, FLGoogle Scholar
- 2.Budinger TF (1987) Nuclear Magnetic Resonance (NMR) in vivo studies: known thresholds for health effects. Arch Phys Med Rehabil 68: 162 - 164Google Scholar
- 3.Shellock FC (1989) Biological effects and safety aspects of magnetic resonance imaging. Magn Reson Q 2: 25 - 30Google Scholar
- 6.Shellock FG, Crues JV (1987) High-field MR imaging of metallic biomedical implants: an in vitro evaluation of deflection forces and temperature changes induced in large prostheses. Radiology 165 - 150Google Scholar
- 7.Lund G, Nelson JD, Wirtschafter JD, Williams PA (1986) Tatooing of eyelids: magnetic resonance imaging artifacts. Ophtalmic Surg 17: 550 - 553Google Scholar
- 8.Pusey E, Lufkin RB, Brown RKJ, et al (1986) Magnetic resonance imaging artifacts: mechanism and clinical significance. RadioGrapraphics 6: 891 - 911Google Scholar
- 11.Sondergaard L, Thomsen C, Strahlberg F, Gymoese E, Lindvig K, Hildebrandt P, Henriksen O (1992) Mitral and aortic valvular flow: quantification with MR phase mapping. J Magn Reson Imaging: 295 - 302Google Scholar
- 12.Koppensteiner R, Moritz A, Schlick W, et al (1991) Blood rheology after cardiac valve replacement with mechanical prostheses or bioprostheses [Abstract] Radiology 180: 589Google Scholar
- 13.Khandheria BK, Oh J (1993) Transesophageal echocardiography: state-of-the-art and future directions [Abstract]. Radiology 186: 588Google Scholar
- 14.Sechtem U, Pflugfelder PW, Cassidy MM, White RD, Cheitlin MD, Schiller NB, Higgins CB (1988) Mitral or aortic regurgitation: quantification of regurgitant volumes with tine MR imaging. Radiology 167 - 425Google Scholar
- 15.Hartiala JJ, Mostbeck GH, Foster E, Fujita N, Matthias CD, Chazouilleres AF, Higgins CB (1993) Velocity-encoded cine MR in the evaluation of left ventricular diastolic function: measurement of mitral valve and pulmonary vein flow velocities and flow volume across the mitral valve. Am Heart J 125: 1054 - 1066PubMedCrossRefGoogle Scholar