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Ryan M, De Silva K, Morgan H, O’Gallagher K, Demir OM, Rahman H, Ellis H, Dancy L, Sado D, Strange J, Melikian N, Marber M, Shah AM, Chiribiri A, Perera D. Coronary Wave Intensity Analysis as an Invasive and Vessel-Specific Index of Myocardial Viability. Circ Cardiovasc Interv 2022; 15:e012394. [PMID: 36538582 PMCID: PMC9760472 DOI: 10.1161/circinterventions.122.012394] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Accepted: 10/28/2022] [Indexed: 01/10/2023]
Abstract
BACKGROUND Coronary angiography and viability testing are the cornerstones of diagnosing and managing ischemic cardiomyopathy. At present, no single test serves both needs. Coronary wave intensity analysis interrogates both contractility and microvascular physiology of the subtended myocardium and therefore has the potential to fulfil the goal of completely assessing coronary physiology and myocardial viability in a single procedure. We hypothesized that coronary wave intensity analysis measured during coronary angiography would predict viability with a similar accuracy to late-gadolinium-enhanced cardiac magnetic resonance imaging. METHODS Patients with a left ventricular ejection fraction ≤40% and extensive coronary disease were enrolled. Coronary wave intensity analysis was assessed during cardiac catheterization at rest, during adenosine-induced hyperemia, and during low-dose dobutamine stress using a dual pressure-Doppler sensing coronary guidewire. Scar burden was assessed with cardiac magnetic resonance imaging. Regional left ventricular function was assessed at baseline and 6-month follow-up after optimization of medical-therapy±revascularization, using transthoracic echocardiography. The primary outcome was myocardial viability, determined by the retrospective observation of functional recovery. RESULTS Forty participants underwent baseline physiology, cardiac magnetic resonance imaging, and echocardiography, and 30 had echocardiography at 6 months; 21/42 territories were viable on follow-up echocardiography. Resting backward compression wave energy was significantly greater in viable than in nonviable territories (-5240±3772 versus -1873±1605 W m-2 s-1, P<0.001), and had comparable accuracy to cardiac magnetic resonance imaging for predicting viability (area under the curve 0.812 versus 0.757, P=0.649); a threshold of -2500 W m-2 s-1 had 86% sensitivity and 76% specificity. CONCLUSIONS Backward compression wave energy has accuracy similar to that of late-gadolinium-enhanced cardiac magnetic resonance imaging in the prediction of viability. Coronary wave intensity analysis has the potential to streamline the management of ischemic cardiomyopathy, in a manner analogous to the effect of fractional flow reserve on the management of stable angina.
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Affiliation(s)
- Matthew Ryan
- Cardiovascular Division, King’s College London, UK (M.R., K.D.S., H.M., K.O., O.M.D., H.R., H.E., M.M., A.M.S., D.P.)
| | - Kalpa De Silva
- Cardiovascular Division, King’s College London, UK (M.R., K.D.S., H.M., K.O., O.M.D., H.R., H.E., M.M., A.M.S., D.P.)
| | - Holly Morgan
- Cardiovascular Division, King’s College London, UK (M.R., K.D.S., H.M., K.O., O.M.D., H.R., H.E., M.M., A.M.S., D.P.)
| | - Kevin O’Gallagher
- Cardiovascular Division, King’s College London, UK (M.R., K.D.S., H.M., K.O., O.M.D., H.R., H.E., M.M., A.M.S., D.P.)
| | - Ozan M. Demir
- Cardiovascular Division, King’s College London, UK (M.R., K.D.S., H.M., K.O., O.M.D., H.R., H.E., M.M., A.M.S., D.P.)
| | - Haseeb Rahman
- Cardiovascular Division, King’s College London, UK (M.R., K.D.S., H.M., K.O., O.M.D., H.R., H.E., M.M., A.M.S., D.P.)
| | - Howard Ellis
- Cardiovascular Division, King’s College London, UK (M.R., K.D.S., H.M., K.O., O.M.D., H.R., H.E., M.M., A.M.S., D.P.)
| | - Luke Dancy
- Cardiology Department, King’s College Hospital, London, UK (L.D., D.S., N.M.)
| | - Daniel Sado
- Cardiology Department, King’s College Hospital, London, UK (L.D., D.S., N.M.)
| | | | | | - Michael Marber
- Cardiovascular Division, King’s College London, UK (M.R., K.D.S., H.M., K.O., O.M.D., H.R., H.E., M.M., A.M.S., D.P.)
| | - Ajay M. Shah
- Cardiovascular Division, King’s College London, UK (M.R., K.D.S., H.M., K.O., O.M.D., H.R., H.E., M.M., A.M.S., D.P.)
| | - Amedeo Chiribiri
- Cardiovascular Division, King’s College London, UK (M.R., K.D.S., H.M., K.O., O.M.D., H.R., H.E., M.M., A.M.S., D.P.)
- Imaging Sciences Division, King’s College London, UK (A.C.)
| | - Divaka Perera
- Cardiovascular Division, King’s College London, UK (M.R., K.D.S., H.M., K.O., O.M.D., H.R., H.E., M.M., A.M.S., D.P.)
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The physiological effects of cardiac resynchronization therapy on aortic and pulmonary flow and dynamic and static components of systemic impedance. Heart Rhythm O2 2021; 2:365-373. [PMID: 34430942 PMCID: PMC8369303 DOI: 10.1016/j.hroo.2021.05.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Background Patients who improve following cardiac resynchronization therapy (CRT) have left ventricular (LV) remodeling and improved cardiac output (CO). Effects on the systemic circulation are unknown. Objective To explore the effects of CRT on aortic and pulmonary blood flow and systemic afterload. Methods At CRT implant patients underwent a noninvasive assessment of central hemodynamics, including wave intensity analysis (n = 28). This was repeated at 6 months after CRT. A subsample (n = 11) underwent an invasive electrophysiological and hemodynamic assessment immediately following CRT. CRT response was defined as reduction in LV end-systolic volume ≥15% at 6 months. Results In CRT responders (75% of those in the noninvasive arm), there was a significant increase in CO (from 3 ± 2 L/min to 4 ± 2 L/min, P = .002) and LV dP/dtmax (from 846 ± 162 mm Hg/s to 958 ± 194 mm Hg/s, P = .001), immediately after CRT in those in the invasive arm. They demonstrated a significant increase in aortic forward compression wave (FCW) both acutely and at follow-up. The relative change in LV dP/dtmax strongly correlated with changes in the aortic FCW (R s 0.733, P = .025). CRT responders displayed a significant reduction in afterload, and a decrease in systemic vascular resistance and pulse wave velocity acutely; there was a significant decrease in acute pulmonary afterload measured by the pulmonary FCW and forward expansion wave. Conclusion Improved cardiac function following CRT is attributable to a combination of changes in the cardiac and cardiovascular system. The relative importance of these 2 mechanisms may then be important for optimizing CRT.
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Patterson T, Rivolo S, Burkhoff D, Schreuder J, Briceno N, Allen C, Williams R, Arri S, Asrress KN, Joseph J, McConkey HZR, Ellis H, Pavlidis A, Clapp B, Perera D, Lee J, Marber MS, Redwood SR. Physiological Impact of Afterload Reduction on Cardiac Mechanics and Coronary Hemodynamics Following Isosorbide Dinitrate Administration in Ischemic Heart Disease. J Cardiovasc Transl Res 2021; 14:962-974. [PMID: 33721195 PMCID: PMC8575737 DOI: 10.1007/s12265-021-10112-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/04/2020] [Accepted: 02/16/2021] [Indexed: 01/09/2023]
Abstract
Understanding the cardiac-coronary interaction is fundamental to developing treatment strategies for ischemic heart disease. We sought to examine the impact of afterload reduction following isosorbide dinitrate (ISDN) administration on LV properties and coronary hemodynamics to further our understanding of the cardiac-coronary interaction. Novel methodology enabled real-time simultaneous acquisition and analysis of coronary and LV hemodynamics in vivo using coronary pressure-flow wires (used to derive coronary wave energies) and LV pressure-volume loop assessment. ISDN administration resulted in afterload reduction, reduced myocardial demand, and increased mechanical efficiency (all P<0.01). Correlations were demonstrated between the forward compression wave (FCW) and arterial elastance (r=0.6) following ISDN. In the presence of minimal microvascular resistance, coronary blood flow velocity exhibited an inverse relationship with LV elastance. In summary this study demonstrated a reduction in myocardial demand with ISDN, an inverse relationship between coronary blood flow velocity and LV contraction-relaxation and a direct correlation between FCW and arterial elastance. The pressure volume-loop and corresponding parameters b The pressure volume loop before (solid line) and after (broken line) Isosorbide dintrate.
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Affiliation(s)
- Tiffany Patterson
- Cardiovascular Division, King's College London, St. Thomas' Hospital, Westminster Bridge Road, SE1 7EH, London, UK.
| | - Simone Rivolo
- Department of Imaging Science, St. Thomas' Hospital, King's College London, London, UK
| | | | - Jan Schreuder
- Thoraxcenter Erasmus University Medical Center, Rotterdam, Netherlands
| | - Natalia Briceno
- Cardiovascular Division, King's College London, St. Thomas' Hospital, Westminster Bridge Road, SE1 7EH, London, UK
| | - Christopher Allen
- Cardiovascular Division, King's College London, St. Thomas' Hospital, Westminster Bridge Road, SE1 7EH, London, UK
| | - Rupert Williams
- Cardiovascular Division, King's College London, St. Thomas' Hospital, Westminster Bridge Road, SE1 7EH, London, UK
| | - Satpal Arri
- Cardiovascular Division, King's College London, St. Thomas' Hospital, Westminster Bridge Road, SE1 7EH, London, UK
| | - Kaleab N Asrress
- Cardiovascular Division, King's College London, St. Thomas' Hospital, Westminster Bridge Road, SE1 7EH, London, UK
| | - Jubin Joseph
- Cardiovascular Division, King's College London, St. Thomas' Hospital, Westminster Bridge Road, SE1 7EH, London, UK
| | - Hannah Z R McConkey
- Cardiovascular Division, King's College London, St. Thomas' Hospital, Westminster Bridge Road, SE1 7EH, London, UK
| | - Howard Ellis
- Cardiovascular Division, King's College London, St. Thomas' Hospital, Westminster Bridge Road, SE1 7EH, London, UK
| | - Antonis Pavlidis
- Cardiothoracic Department, Guy's and St. Thomas' NHS Foundation Trust, London, UK
| | - Brian Clapp
- Cardiothoracic Department, Guy's and St. Thomas' NHS Foundation Trust, London, UK
| | - Divaka Perera
- Cardiovascular Division, King's College London, St. Thomas' Hospital, Westminster Bridge Road, SE1 7EH, London, UK
| | - Jack Lee
- Department of Imaging Science, St. Thomas' Hospital, King's College London, London, UK
| | - Michael S Marber
- Cardiovascular Division, King's College London, St. Thomas' Hospital, Westminster Bridge Road, SE1 7EH, London, UK
| | - Simon R Redwood
- Cardiovascular Division, King's College London, St. Thomas' Hospital, Westminster Bridge Road, SE1 7EH, London, UK
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Mynard JP, Kondiboyina A, Kowalski R, Cheung MMH, Smolich JJ. Measurement, Analysis and Interpretation of Pressure/Flow Waves in Blood Vessels. Front Physiol 2020; 11:1085. [PMID: 32973569 PMCID: PMC7481457 DOI: 10.3389/fphys.2020.01085] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2020] [Accepted: 08/06/2020] [Indexed: 01/10/2023] Open
Abstract
The optimal performance of the cardiovascular system, as well as the break-down of this performance with disease, both involve complex biomechanical interactions between the heart, conduit vascular networks and microvascular beds. ‘Wave analysis’ refers to a group of techniques that provide valuable insight into these interactions by scrutinizing the shape of blood pressure and flow/velocity waveforms. The aim of this review paper is to provide a comprehensive introduction to wave analysis, with a focus on key concepts and practical application rather than mathematical derivations. We begin with an overview of invasive and non-invasive measurement techniques that can be used to obtain the signals required for wave analysis. We then review the most widely used wave analysis techniques—pulse wave analysis, wave separation and wave intensity analysis—and associated methods for estimating local wave speed or characteristic impedance that are required for decomposing waveforms into forward and backward wave components. This is followed by a discussion of the biomechanical phenomena that generate waves and the processes that modulate wave amplitude, both of which are critical for interpreting measured wave patterns. Finally, we provide a brief update on several emerging techniques/concepts in the wave analysis field, namely wave potential and the reservoir-excess pressure approach.
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Affiliation(s)
- Jonathan P Mynard
- Heart Research, Murdoch Children's Research Institute, Melbourne, VIC, Australia.,Department of Paediatrics, The University of Melbourne, Melbourne, VIC, Australia.,Department of Biomedical Engineering, The University of Melbourne, Melbourne, VIC, Australia.,Department of Cardiology, The Royal Children's Hospital, Parkville, VIC, Australia
| | - Avinash Kondiboyina
- Heart Research, Murdoch Children's Research Institute, Melbourne, VIC, Australia.,Department of Paediatrics, The University of Melbourne, Melbourne, VIC, Australia
| | - Remi Kowalski
- Heart Research, Murdoch Children's Research Institute, Melbourne, VIC, Australia.,Department of Paediatrics, The University of Melbourne, Melbourne, VIC, Australia.,Department of Cardiology, The Royal Children's Hospital, Parkville, VIC, Australia
| | - Michael M H Cheung
- Heart Research, Murdoch Children's Research Institute, Melbourne, VIC, Australia.,Department of Paediatrics, The University of Melbourne, Melbourne, VIC, Australia.,Department of Cardiology, The Royal Children's Hospital, Parkville, VIC, Australia
| | - Joseph J Smolich
- Heart Research, Murdoch Children's Research Institute, Melbourne, VIC, Australia.,Department of Paediatrics, The University of Melbourne, Melbourne, VIC, Australia
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deMarchi SF, Gassmann C, Traupe T, Gloekler S, Cook S, Vogel R, Gysi K, Seiler C. Coronary wave intensity patterns in stable coronary artery disease: influence of stenosis severity and collateral circulation. Open Heart 2019; 6:e000999. [PMID: 31749972 PMCID: PMC6827744 DOI: 10.1136/openhrt-2018-000999] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/20/2018] [Revised: 09/19/2019] [Accepted: 09/23/2019] [Indexed: 01/10/2023] Open
Abstract
Objective Wave intensity analysis is a method that allows separating pulse waves into components generated proximally and in the periphery of arterial trees, as well as characterising them as accelerating or decelerating. The early diastolic suction wave (eaDSW) is one of the most prominent wave events in the coronaries. The aim of this study was to determine whether (1) microvascular dilatation directly influences its energy, (2) stenosis severity can be assessed proximal to stenoses, (3) distal pulse wave entrapment exists in the presence of stenoses and (4) coronary collaterals influence wave entrapment. Methods In 43 coronary artery disease patients, Doppler flow velocity and pressure measurements were performed in a proximal coronary segment at rest, in a distal segment at rest, during adenosine-induced hyperaemia and during balloon occlusion. Wave energies were calculated as the area under the wave intensity curves. Results The eaDSW energy showed a significant increase during hyperaemia, but did not differ between proximal and distal segments. There was no significant correlation between eaDSW energy and coronary stenosis severity. Pulse wave entrapment could not be observed consistently in the distal segments. Consequently, the effect of coronary collaterals on pulse wave entrapment could not be studied. Conclusions Microvascular dilation in the coronary circulation increases distal eaDSW energy. However, it does not show any diagnostically useful variation between measurement sites, various stenosis degrees and amount of collateral flow. The assessment eaDSW and its reflections were not useful for the quantification of coronary stenosis severity or the collateral circulation in clinical practice.
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Affiliation(s)
| | | | - Tobias Traupe
- Cardiology, University Hospital Bern, Bern, Switzerland
| | | | - Stéphane Cook
- Cardiology, University Hospital Bern, Bern, Switzerland
| | - Rolf Vogel
- Cardiology, University Hospital Bern, Bern, Switzerland
| | - Kurt Gysi
- Cardiology, University Hospital Bern, Bern, Switzerland
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