Panagiotis Xaplanteris1, Stephane Fournier1, Daniëlle C J Keulards1, Julien Adjedj1, Giovanni Ciccarelli1, Anastasios Milkas1, Mariano Pellicano1, Marcel Van't Veer1, Emanuele Barbato1, Nico H J Pijls1, Bernard De Bruyne2. 1. From the Cardiovascular Center Aalst, Belgium (P.X., S.F., J.A., G.C., A.M., M.P., E.B., B.D.B.); Department of Cardiology, Catharina Hospital, Eindhoven, the Netherlands (D.K., M.v.V., N.H.J.P.); Department of Biomedical Engineering, Eindhoven University of Technology, the Netherlands (D.K., M.v.V., N.H.J.P.); and Department of Advanced Biomedical Sciences, University of Naples Federico II, Italy (E.B.). 2. From the Cardiovascular Center Aalst, Belgium (P.X., S.F., J.A., G.C., A.M., M.P., E.B., B.D.B.); Department of Cardiology, Catharina Hospital, Eindhoven, the Netherlands (D.K., M.v.V., N.H.J.P.); Department of Biomedical Engineering, Eindhoven University of Technology, the Netherlands (D.K., M.v.V., N.H.J.P.); and Department of Advanced Biomedical Sciences, University of Naples Federico II, Italy (E.B.). bernard.de.bruyne@olvz-aalst.be.
Abstract
BACKGROUND: The principle of continuous thermodilution can be used to calculate absolute coronary blood flow and microvascular resistance (R). The aim of the study is to explore the safety, feasibility, and reproducibility of coronary blood flow and R measurements as measured by continuous thermodilution in humans. METHODS AND RESULTS: Absolute coronary flow and R can be calculated by thermodilution by infusing saline at room temperature through a dedicated monorail catheter. The temperature of saline as it enters the vessel, the temperature of blood and saline mixed in the distal part of the vessel, and the distal coronary pressure were measured by a pressure/temperature sensor-tipped guidewire. The feasibility and safety of the method were tested in 135 patients who were referred for coronary angiography. No significant adverse events were observed; in 11 (8.1%) patients, bradycardia and concomitant atrioventricular block appeared transiently and were reversed immediately on interruption of the infusion. The reproducibility of measurements was tested in a subgroup of 80 patients (129 arteries). Duplicate measurements had a strong correlation both for coronary blood flow (ρ=0.841, P<0.001; intraclass correlation coefficient=0.89, P<0.001) and R (ρ=0.780, P<0.001; intraclass correlation coefficient=0.89, P<0.001). In Bland-Altman plots, there was no significant bias or asymmetry. CONCLUSIONS: Absolute coronary blood flow (in L/min) and R (in mm Hg/L/min or Wood units) can be safely and reproducibly measured with continuous thermodilution. This approach constitutes a new opportunity for the study of the coronary microcirculation.
BACKGROUND: The principle of continuous thermodilution can be used to calculate absolute coronary blood flow and microvascular resistance (R). The aim of the study is to explore the safety, feasibility, and reproducibility of coronary blood flow and R measurements as measured by continuous thermodilution in humans. METHODS AND RESULTS: Absolute coronary flow and R can be calculated by thermodilution by infusing saline at room temperature through a dedicated monorail catheter. The temperature of saline as it enters the vessel, the temperature of blood and saline mixed in the distal part of the vessel, and the distal coronary pressure were measured by a pressure/temperature sensor-tipped guidewire. The feasibility and safety of the method were tested in 135 patients who were referred for coronary angiography. No significant adverse events were observed; in 11 (8.1%) patients, bradycardia and concomitant atrioventricular block appeared transiently and were reversed immediately on interruption of the infusion. The reproducibility of measurements was tested in a subgroup of 80 patients (129 arteries). Duplicate measurements had a strong correlation both for coronary blood flow (ρ=0.841, P<0.001; intraclass correlation coefficient=0.89, P<0.001) and R (ρ=0.780, P<0.001; intraclass correlation coefficient=0.89, P<0.001). In Bland-Altman plots, there was no significant bias or asymmetry. CONCLUSIONS: Absolute coronary blood flow (in L/min) and R (in mm Hg/L/min or Wood units) can be safely and reproducibly measured with continuous thermodilution. This approach constitutes a new opportunity for the study of the coronary microcirculation.
Authors: Vijay Kunadian; Alaide Chieffo; Paolo G Camici; Colin Berry; Javier Escaned; Angela H E M Maas; Eva Prescott; Nicole Karam; Yolande Appelman; Chiara Fraccaro; Gill Louise Buchanan; Stephane Manzo-Silberman; Rasha Al-Lamee; Evelyn Regar; Alexandra Lansky; J Dawn Abbott; Lina Badimon; Dirk J Duncker; Roxana Mehran; Davide Capodanno; Andreas Baumbach Journal: Eur Heart J Date: 2020-10-01 Impact factor: 29.983
Authors: Paul D Morris; Rebecca Gosling; Iwona Zwierzak; Holli Evans; Louise Aubiniere-Robb; Krzysztof Czechowicz; Paul C Evans; D Rodney Hose; Patricia V Lawford; Andrew J Narracott; Julian P Gunn Journal: Cardiovasc Res Date: 2021-05-25 Impact factor: 13.081
Authors: Kim A Dora; Lyudmyla Borysova; Xi Ye; Chloe Powell; Timea Z Beleznai; Christopher P Stanley; Vito D Bruno; Tobias Starborg; Errin Johnson; Anna Pielach; Michael Taggart; Nicola Smart; Raimondo Ascione Journal: Cardiovasc Res Date: 2022-06-29 Impact factor: 13.081