Turbulence downstream of subcoronary stentless and stented aortic valves
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Turbulence downstream of subcoronary stentless and stented aortic valves. / Funder, Jonas Amstrup; Frost, Markus Winther; Wierup, Per; Klaaborg, Kaj-Erik; Hjortdal, Vibeke; Nygaard, Hans; Hasenkam, J Michael.
I: Journal of Biomechanics, Bind 44, Nr. 12, 11.08.2011, s. 2273-8.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - Turbulence downstream of subcoronary stentless and stented aortic valves
AU - Funder, Jonas Amstrup
AU - Frost, Markus Winther
AU - Wierup, Per
AU - Klaaborg, Kaj-Erik
AU - Hjortdal, Vibeke
AU - Nygaard, Hans
AU - Hasenkam, J Michael
N1 - Copyright © 2011 Elsevier Ltd. All rights reserved.
PY - 2011/8/11
Y1 - 2011/8/11
N2 - Regions of turbulence downstream of bioprosthetic heart valves may cause damage to blood components, vessel wall as well as to aortic valve leaflets. Stentless aortic heart valves are known to posses several hemodynamic benefits such as larger effective orifice areas, lower aortic transvalvular pressure difference and faster left ventricular mass regression compared with their stented counterpart. Whether this is reflected by diminished turbulence formation, remains to be shown. We implanted either stented pericardial valve prostheses (Mitroflow), stentless valve prostheses (Solo or Toronto SPV) in pigs or they preserved their native valves. Following surgery, blood velocity was measured in the cross sectional area downstream of the valves using 10MHz ultrasonic probes connected to a dedicated pulsed Doppler equipment. As a measure of turbulence, Reynolds normal stress (RNS) was calculated at two different blood pressures (baseline and 50% increase). We found no difference in maximum RNS measurements between any of the investigated valve groups. The native valve had significantly lower mean RNS values than the Mitroflow (p=0.004), Toronto SPV (p=0.008) and Solo valve (p=0.02). There were no statistically significant differences between the artificial valve groups (p=0.3). The mean RNS was significantly larger when increasing blood pressure (p=0.0006). We, thus, found no advantages for the stentless aortic valves compared with stented prosthesis in terms of lower maximum or mean RNS values. Native valves have a significantly lower mean RNS value than all investigated bioprostheses.
AB - Regions of turbulence downstream of bioprosthetic heart valves may cause damage to blood components, vessel wall as well as to aortic valve leaflets. Stentless aortic heart valves are known to posses several hemodynamic benefits such as larger effective orifice areas, lower aortic transvalvular pressure difference and faster left ventricular mass regression compared with their stented counterpart. Whether this is reflected by diminished turbulence formation, remains to be shown. We implanted either stented pericardial valve prostheses (Mitroflow), stentless valve prostheses (Solo or Toronto SPV) in pigs or they preserved their native valves. Following surgery, blood velocity was measured in the cross sectional area downstream of the valves using 10MHz ultrasonic probes connected to a dedicated pulsed Doppler equipment. As a measure of turbulence, Reynolds normal stress (RNS) was calculated at two different blood pressures (baseline and 50% increase). We found no difference in maximum RNS measurements between any of the investigated valve groups. The native valve had significantly lower mean RNS values than the Mitroflow (p=0.004), Toronto SPV (p=0.008) and Solo valve (p=0.02). There were no statistically significant differences between the artificial valve groups (p=0.3). The mean RNS was significantly larger when increasing blood pressure (p=0.0006). We, thus, found no advantages for the stentless aortic valves compared with stented prosthesis in terms of lower maximum or mean RNS values. Native valves have a significantly lower mean RNS value than all investigated bioprostheses.
KW - Animals
KW - Aortic Valve/anatomy & histology
KW - Bioprosthesis
KW - Blood Flow Velocity
KW - Blood Pressure
KW - Cardiopulmonary Bypass
KW - Equipment Design
KW - Heart Valve Prosthesis
KW - Heart Valve Prosthesis Implantation/instrumentation
KW - Heart Valves
KW - Models, Anatomic
KW - Pressure
KW - Regression Analysis
KW - Stents
KW - Swine
KW - Ultrasonography, Doppler/methods
U2 - 10.1016/j.jbiomech.2011.05.035
DO - 10.1016/j.jbiomech.2011.05.035
M3 - Journal article
C2 - 21696741
VL - 44
SP - 2273
EP - 2278
JO - Journal of Biomechanics
JF - Journal of Biomechanics
SN - 0021-9290
IS - 12
ER -
ID: 247872646