Thermal anemometric assessment of coronary flow reserve with a pressure-sensing guide wire : an in vitro evaluation

A. Horst, van der, M.C.F. Geven, M.C.M. Rutten, N.H.J. Pijls, F.N. Vosse, van de

Research output: Contribution to journalArticleAcademicpeer-review

6 Citations (Scopus)

Abstract

Assessment of coronary flow reserve (CFR) with a commercially available pressure-sensor-tipped guide wire using the principle of thermal anemometry could provide major clinical benefits both in determining and in distinguishing between epicardial and microvascular coronary artery disease. In constant-temperature thermal anemometry, the electrical power required to maintain an element at a constant temperature is a measure for the local shear rate. Here, the feasibility of applying this thermoconvection method to a pressure-sensing guide wire is investigated using an in vitro model. A theoretical relation between electrical power and steady shear rate based on boundary layer theory was tested in an experimental set-up. In steady flow, a reproducible relation between electrical power and shear rate was obtained with an overheat temperature of 20 K, which was in good agreement with theory. The relation between shear rate and flow, however, depends on geometry of the artery and position of the guide wire inside the vessel. Although this means that this thermoconvection method is less useful for absolute flow measurements, CFR could be assessed even for unsteady flow using the steady calibration curve with a mean relative difference of (3 ± 5)% compared to CFR derived from the golden standard using an ultrasonic flow measurement device.
Original languageEnglish
Pages (from-to)684-691
Number of pages8
JournalMedical Engineering & Physics
Volume33
Issue number6
DOIs
Publication statusPublished - 2011

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Shear deformation
Hot Temperature
Wire
Pressure
Temperature
Flow measurement
Ultrasonics
Ultrasonic measurement
Calibration
Coronary Artery Disease
Pressure sensors
Steady flow
Shear flow
Unsteady flow
Arteries
Equipment and Supplies
Boundary layers
Geometry
In Vitro Techniques

Cite this

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title = "Thermal anemometric assessment of coronary flow reserve with a pressure-sensing guide wire : an in vitro evaluation",
abstract = "Assessment of coronary flow reserve (CFR) with a commercially available pressure-sensor-tipped guide wire using the principle of thermal anemometry could provide major clinical benefits both in determining and in distinguishing between epicardial and microvascular coronary artery disease. In constant-temperature thermal anemometry, the electrical power required to maintain an element at a constant temperature is a measure for the local shear rate. Here, the feasibility of applying this thermoconvection method to a pressure-sensing guide wire is investigated using an in vitro model. A theoretical relation between electrical power and steady shear rate based on boundary layer theory was tested in an experimental set-up. In steady flow, a reproducible relation between electrical power and shear rate was obtained with an overheat temperature of 20 K, which was in good agreement with theory. The relation between shear rate and flow, however, depends on geometry of the artery and position of the guide wire inside the vessel. Although this means that this thermoconvection method is less useful for absolute flow measurements, CFR could be assessed even for unsteady flow using the steady calibration curve with a mean relative difference of (3 ± 5){\%} compared to CFR derived from the golden standard using an ultrasonic flow measurement device.",
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Thermal anemometric assessment of coronary flow reserve with a pressure-sensing guide wire : an in vitro evaluation. / Horst, van der, A.; Geven, M.C.F.; Rutten, M.C.M.; Pijls, N.H.J.; Vosse, van de, F.N.

In: Medical Engineering & Physics, Vol. 33, No. 6, 2011, p. 684-691.

Research output: Contribution to journalArticleAcademicpeer-review

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AB - Assessment of coronary flow reserve (CFR) with a commercially available pressure-sensor-tipped guide wire using the principle of thermal anemometry could provide major clinical benefits both in determining and in distinguishing between epicardial and microvascular coronary artery disease. In constant-temperature thermal anemometry, the electrical power required to maintain an element at a constant temperature is a measure for the local shear rate. Here, the feasibility of applying this thermoconvection method to a pressure-sensing guide wire is investigated using an in vitro model. A theoretical relation between electrical power and steady shear rate based on boundary layer theory was tested in an experimental set-up. In steady flow, a reproducible relation between electrical power and shear rate was obtained with an overheat temperature of 20 K, which was in good agreement with theory. The relation between shear rate and flow, however, depends on geometry of the artery and position of the guide wire inside the vessel. Although this means that this thermoconvection method is less useful for absolute flow measurements, CFR could be assessed even for unsteady flow using the steady calibration curve with a mean relative difference of (3 ± 5)% compared to CFR derived from the golden standard using an ultrasonic flow measurement device.

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