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Minten L, Bennett J, McCutcheon K, Oosterlinck W, Algoet M, Otsuki H, Takahashi K, Fearon WF, Dubois C. Optimization of Absolute Coronary Blood Flow Measurements to Assess Microvascular Function: In Vivo Validation of Hyperemia and Higher Infusion Speeds. Circ Cardiovasc Interv 2024:e013860. [PMID: 38682331 DOI: 10.1161/circinterventions.123.013860] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/20/2023] [Accepted: 03/15/2024] [Indexed: 05/01/2024]
Abstract
BACKGROUND Reliable assessment of coronary microvascular function is essential. Techniques to measure absolute coronary blood flow are promising but need validation. The objectives of this study were: first, to validate the potential of saline infusion to generate maximum hyperemia in vivo. Second, to validate absolute coronary blood flow measured with continuous coronary thermodilution at high (40-50 mL/min) infusion speeds and asses its safety. METHODS Fourteen closed-chest sheep underwent absolute coronary blood flow measurements with increasing saline infusion speeds at different dosages under general anesthesia. An additional 7 open-chest sheep underwent these measurements with epicardial Doppler flow probes. Coronary flows were compared with reactive hyperemia after 45 s of coronary occlusion. RESULTS Twenty milliliters per minute of saline infusion induced a significantly lower hyperemic coronary flow (140 versus 191 mL/min; P=0.0165), lower coronary flow reserve (1.82 versus 3.21; P≤0.0001), and higher coronary resistance (655 versus 422 woods units; P=0.0053) than coronary occlusion. On the other hand, 30 mL/min of saline infusion resulted in hyperemic coronary flow (196 versus 192 mL/min; P=0.8292), coronary flow reserve (2.77 versus 3.21; P=0.1107), and coronary resistance (415 versus 422 woods units; P=0.9181) that were not different from coronary occlusion. Hyperemic coronary flow was 40.7% with 5 mL/min, 40.8% with 10 mL/min, 73.1% with 20 mL/min, 102.3% with 30 mL/min, 99.0% with 40 mL/min, and 98.0% with 50 mL/min of saline infusion when compared with postocclusive hyperemic flow. There was a significant bias toward flow overestimation (Bland-Altman: bias±SD, -73.09±30.52; 95% limits of agreement, -132.9 to -13.27) with 40 to 50 mL/min of saline. Occasionally, ischemic changes resulted in ventricular fibrillation (9.5% with 50 mL/min) at higher infusion rates. CONCLUSIONS Continuous saline infusion of 30 mL/min but not 20 mL/min induced maximal hyperemia. Absolute coronary blood flow measured with saline infusion speeds of 40 to 50 mL/min was not accurate and not safe.
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Affiliation(s)
- Lennert Minten
- Department of Cardiovascular Sciences, Katholieke Universiteit Leuven, Belgium (L.M., J.B., K.M.C., W.O., M.A., C.D.)
- Division of Cardiovascular Medicine, Stanford University, CA (L.M., H.O., K.T., W.F.F.)
| | - Johan Bennett
- Department of Cardiovascular Sciences, Katholieke Universiteit Leuven, Belgium (L.M., J.B., K.M.C., W.O., M.A., C.D.)
- Departments of Cardiovascular Medicine, UZ Leuven, Belgium. (J.B., C.D.)
| | - Keir McCutcheon
- Department of Cardiovascular Sciences, Katholieke Universiteit Leuven, Belgium (L.M., J.B., K.M.C., W.O., M.A., C.D.)
| | - Wouter Oosterlinck
- Department of Cardiovascular Sciences, Katholieke Universiteit Leuven, Belgium (L.M., J.B., K.M.C., W.O., M.A., C.D.)
- Cardiac Surgery, UZ Leuven, Belgium. (W.O., M.A.)
| | - Michiel Algoet
- Department of Cardiovascular Sciences, Katholieke Universiteit Leuven, Belgium (L.M., J.B., K.M.C., W.O., M.A., C.D.)
- Cardiac Surgery, UZ Leuven, Belgium. (W.O., M.A.)
| | - Hisao Otsuki
- Division of Cardiovascular Medicine, Stanford University, CA (L.M., H.O., K.T., W.F.F.)
| | - Kuniaki Takahashi
- Division of Cardiovascular Medicine, Stanford University, CA (L.M., H.O., K.T., W.F.F.)
| | - William F Fearon
- Division of Cardiovascular Medicine, Stanford University, CA (L.M., H.O., K.T., W.F.F.)
- VA Palo Alto Health Care System, CA (W.F.F.)
| | - Christophe Dubois
- Department of Cardiovascular Sciences, Katholieke Universiteit Leuven, Belgium (L.M., J.B., K.M.C., W.O., M.A., C.D.)
- Departments of Cardiovascular Medicine, UZ Leuven, Belgium. (J.B., C.D.)
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Minten L, Langenaeken T, McCutcheon K, Bennett J, Van Hecke M, Algoet M, Bézy S, Duchenne J, Puvrez A, Wouters L, Voigt JU, Adriaenssens T, Desmet W, Sinnaeve P, Verbrugghe P, Oosterlinck W, Claus P, Meuris B, Dubois C. An interventional sheep model of severe aortic valve stenosis hemodynamics for the evaluation of alterations in coronary physiology and microvascular function. J Appl Physiol (1985) 2024; 136:606-617. [PMID: 38328825 DOI: 10.1152/japplphysiol.00737.2023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2023] [Accepted: 02/02/2024] [Indexed: 02/09/2024] Open
Abstract
We aimed to develop a large animal model of subcoronary aortic stenosis (AS) to study intracoronary and microcirculatory hemodynamics. A total of three surgical techniques inducing AS were evaluated in 12 sheep. Suturing the leaflets together around a dilator (n = 2) did not result in severe AS. Suturing of a pericardial patch with a variable opening just below the aortic valve (n = 5) created an AS which was poorly tolerated if the aortic valve area (AVA) was too small (0.38-1.02 cm2), but was feasible with an AVA of 1.2 cm2. However, standardization of aortic regurgitation (AR) with this technique is difficult. Therefore, we opted for implantation of an undersized AV-bioprosthesis with narrowing sutures on the leaflets (n = 5). Overall, five sheep survived the immediate postoperative period of which three had severe AS (one patch and two bioprostheses). The surviving sheep with severe AS developed left ventricular hypertrophy and signs of increased filling-pressures. Intracoronary assessment of physiological indices in these AS sheep pointed toward the development of functional microvascular dysfunction, with a significant increase in coronary resting flow and hyperemic coronary resistance, resulting in a significantly higher index of microvascular resistance (IMR) and lower myocardial resistance reserve (MRR). Microscopic analysis showed myocardial hypertrophy and signs of fibrosis without evidence of capillary rarefaction. In a large animal model of AS, microvascular changes are characterized by increased resting coronary flow and hyperemic coronary resistance resulting in increased IMR and decreased MRR. These physiological changes can influence the interpretation of regularly used coronary indices.NEW & NOTEWORTHY In an animal model of aortic valve stenosis (AS), coronary physiological changes are characterized by increased resting coronary flow and hyperemic coronary resistance. These changes can impact coronary indices frequently used to assess concomitant coronary artery disease (CAD). At this point, the best way to assess and treat CAD in AS remains unclear. Our data suggest that fractional flow reserve may underestimate CAD, and nonhyperemic pressure ratios may overestimate CAD severity before aortic valve replacement.
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Affiliation(s)
- Lennert Minten
- Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
- Department of Cardiovascular Medicine, University Hospitals Leuven (UZ Leuven), Leuven, Belgium
| | - Tom Langenaeken
- Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
- Department of Cardiac Surgery, University Hospitals Leuven (UZ Leuven), Leuven, Belgium
| | - Keir McCutcheon
- Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
| | - Johan Bennett
- Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
- Department of Cardiovascular Medicine, University Hospitals Leuven (UZ Leuven), Leuven, Belgium
| | - Manon Van Hecke
- Department of Imaging and Pathology, KU Leuven, Leuven, Belgium
| | - Michiel Algoet
- Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
- Department of Cardiac Surgery, University Hospitals Leuven (UZ Leuven), Leuven, Belgium
| | - Stéphanie Bézy
- Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
| | - Jürgen Duchenne
- Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
| | - Alexis Puvrez
- Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
| | - Laurine Wouters
- Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
| | - Jens-Uwe Voigt
- Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
- Department of Cardiovascular Medicine, University Hospitals Leuven (UZ Leuven), Leuven, Belgium
| | - Tom Adriaenssens
- Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
- Department of Cardiovascular Medicine, University Hospitals Leuven (UZ Leuven), Leuven, Belgium
| | - Walter Desmet
- Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
- Department of Cardiovascular Medicine, University Hospitals Leuven (UZ Leuven), Leuven, Belgium
| | - Peter Sinnaeve
- Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
- Department of Cardiovascular Medicine, University Hospitals Leuven (UZ Leuven), Leuven, Belgium
| | - Peter Verbrugghe
- Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
- Department of Cardiac Surgery, University Hospitals Leuven (UZ Leuven), Leuven, Belgium
| | - Wouter Oosterlinck
- Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
- Department of Cardiac Surgery, University Hospitals Leuven (UZ Leuven), Leuven, Belgium
| | - Piet Claus
- Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
| | - Bart Meuris
- Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
- Department of Cardiac Surgery, University Hospitals Leuven (UZ Leuven), Leuven, Belgium
| | - Christophe Dubois
- Department of Cardiovascular Sciences, KU Leuven, Leuven, Belgium
- Department of Cardiovascular Medicine, University Hospitals Leuven (UZ Leuven), Leuven, Belgium
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Minten L, Algoet M, Bennett J, Oosterlinck W, Meuris B, Langenaeken T, Bézy S, Wouters L, Duchenne J, Puvrez A, De Groote S, Lesizza P, Frederiks P, De Vos L, Adriaenssens T, Sinnaeve P, Desmet W, McCutcheon K, Dubois C. Optimal Measurement of Coronary Flow and Microvascular Function in Animals and Humans. Circ Res 2023; 133:720-722. [PMID: 37650288 DOI: 10.1161/circresaha.123.323341] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
Affiliation(s)
- Lennert Minten
- Department of Cardiovascular Sciences, Katholieke Universiteit Leuven, Belgium (L.M., M.A., J.B., W.O., B.M., T.L., S.B., L.W., J.D., A.P., S.D.G., T.A., P.S., W.D., K.M., C.D.)
- Departments of Cardiovascular Medicine (L.M., J.B., P.L., P.F., L.D.V., T.A., P.S., W.D., C.D.), University Hospitals Leuven (UZ Leuven), Belgium
| | - Michiel Algoet
- Department of Cardiovascular Sciences, Katholieke Universiteit Leuven, Belgium (L.M., M.A., J.B., W.O., B.M., T.L., S.B., L.W., J.D., A.P., S.D.G., T.A., P.S., W.D., K.M., C.D.)
- Cardiac Surgery (M.A., W.O., B.M., T.L.), University Hospitals Leuven (UZ Leuven), Belgium
| | - Johan Bennett
- Department of Cardiovascular Sciences, Katholieke Universiteit Leuven, Belgium (L.M., M.A., J.B., W.O., B.M., T.L., S.B., L.W., J.D., A.P., S.D.G., T.A., P.S., W.D., K.M., C.D.)
- Departments of Cardiovascular Medicine (L.M., J.B., P.L., P.F., L.D.V., T.A., P.S., W.D., C.D.), University Hospitals Leuven (UZ Leuven), Belgium
| | - Wouter Oosterlinck
- Department of Cardiovascular Sciences, Katholieke Universiteit Leuven, Belgium (L.M., M.A., J.B., W.O., B.M., T.L., S.B., L.W., J.D., A.P., S.D.G., T.A., P.S., W.D., K.M., C.D.)
- Cardiac Surgery (M.A., W.O., B.M., T.L.), University Hospitals Leuven (UZ Leuven), Belgium
| | - Bart Meuris
- Department of Cardiovascular Sciences, Katholieke Universiteit Leuven, Belgium (L.M., M.A., J.B., W.O., B.M., T.L., S.B., L.W., J.D., A.P., S.D.G., T.A., P.S., W.D., K.M., C.D.)
- Cardiac Surgery (M.A., W.O., B.M., T.L.), University Hospitals Leuven (UZ Leuven), Belgium
| | - Tom Langenaeken
- Department of Cardiovascular Sciences, Katholieke Universiteit Leuven, Belgium (L.M., M.A., J.B., W.O., B.M., T.L., S.B., L.W., J.D., A.P., S.D.G., T.A., P.S., W.D., K.M., C.D.)
- Cardiac Surgery (M.A., W.O., B.M., T.L.), University Hospitals Leuven (UZ Leuven), Belgium
| | - Stephanie Bézy
- Department of Cardiovascular Sciences, Katholieke Universiteit Leuven, Belgium (L.M., M.A., J.B., W.O., B.M., T.L., S.B., L.W., J.D., A.P., S.D.G., T.A., P.S., W.D., K.M., C.D.)
| | - Laurine Wouters
- Department of Cardiovascular Sciences, Katholieke Universiteit Leuven, Belgium (L.M., M.A., J.B., W.O., B.M., T.L., S.B., L.W., J.D., A.P., S.D.G., T.A., P.S., W.D., K.M., C.D.)
| | - Jürgen Duchenne
- Department of Cardiovascular Sciences, Katholieke Universiteit Leuven, Belgium (L.M., M.A., J.B., W.O., B.M., T.L., S.B., L.W., J.D., A.P., S.D.G., T.A., P.S., W.D., K.M., C.D.)
| | - Alexis Puvrez
- Department of Cardiovascular Sciences, Katholieke Universiteit Leuven, Belgium (L.M., M.A., J.B., W.O., B.M., T.L., S.B., L.W., J.D., A.P., S.D.G., T.A., P.S., W.D., K.M., C.D.)
| | - Senne De Groote
- Department of Cardiovascular Sciences, Katholieke Universiteit Leuven, Belgium (L.M., M.A., J.B., W.O., B.M., T.L., S.B., L.W., J.D., A.P., S.D.G., T.A., P.S., W.D., K.M., C.D.)
| | - Pierluigi Lesizza
- Departments of Cardiovascular Medicine (L.M., J.B., P.L., P.F., L.D.V., T.A., P.S., W.D., C.D.), University Hospitals Leuven (UZ Leuven), Belgium
| | - Pascal Frederiks
- Departments of Cardiovascular Medicine (L.M., J.B., P.L., P.F., L.D.V., T.A., P.S., W.D., C.D.), University Hospitals Leuven (UZ Leuven), Belgium
| | - Laurens De Vos
- Departments of Cardiovascular Medicine (L.M., J.B., P.L., P.F., L.D.V., T.A., P.S., W.D., C.D.), University Hospitals Leuven (UZ Leuven), Belgium
| | - Tom Adriaenssens
- Department of Cardiovascular Sciences, Katholieke Universiteit Leuven, Belgium (L.M., M.A., J.B., W.O., B.M., T.L., S.B., L.W., J.D., A.P., S.D.G., T.A., P.S., W.D., K.M., C.D.)
- Departments of Cardiovascular Medicine (L.M., J.B., P.L., P.F., L.D.V., T.A., P.S., W.D., C.D.), University Hospitals Leuven (UZ Leuven), Belgium
| | - Peter Sinnaeve
- Department of Cardiovascular Sciences, Katholieke Universiteit Leuven, Belgium (L.M., M.A., J.B., W.O., B.M., T.L., S.B., L.W., J.D., A.P., S.D.G., T.A., P.S., W.D., K.M., C.D.)
- Departments of Cardiovascular Medicine (L.M., J.B., P.L., P.F., L.D.V., T.A., P.S., W.D., C.D.), University Hospitals Leuven (UZ Leuven), Belgium
| | - Walter Desmet
- Department of Cardiovascular Sciences, Katholieke Universiteit Leuven, Belgium (L.M., M.A., J.B., W.O., B.M., T.L., S.B., L.W., J.D., A.P., S.D.G., T.A., P.S., W.D., K.M., C.D.)
- Departments of Cardiovascular Medicine (L.M., J.B., P.L., P.F., L.D.V., T.A., P.S., W.D., C.D.), University Hospitals Leuven (UZ Leuven), Belgium
| | - Keir McCutcheon
- Department of Cardiovascular Sciences, Katholieke Universiteit Leuven, Belgium (L.M., M.A., J.B., W.O., B.M., T.L., S.B., L.W., J.D., A.P., S.D.G., T.A., P.S., W.D., K.M., C.D.)
| | - Christophe Dubois
- Department of Cardiovascular Sciences, Katholieke Universiteit Leuven, Belgium (L.M., M.A., J.B., W.O., B.M., T.L., S.B., L.W., J.D., A.P., S.D.G., T.A., P.S., W.D., K.M., C.D.)
- Departments of Cardiovascular Medicine (L.M., J.B., P.L., P.F., L.D.V., T.A., P.S., W.D., C.D.), University Hospitals Leuven (UZ Leuven), Belgium
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