Hyperaemic microvascular resistance is not increased in viable myocardium after chronic myocardial infarction

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Abstract

Aims: The present study compared microvascular resistance (MR) of viable myocardium in infarct areas with those in reference areas in patients with chronic myocardial infarction (MI). Methods and results: In 27 patients, MR (ratio distal coronary pressure and flow) of reference and viable infarct areas was calculated at baseline and during hyperaemia. H2 15O positron emission tomography (PET) was used to provide myocardial blood flow measurements. In infarct regions, H2 15O PET solely measures flow in viable myocardium, excluding flow in scar tissue. Distal coronary pressure was measured with a pressure wire in the infarct-related and reference artery. The average time between PET study and infarction was 3.3 ± 4.4 years. Mean hyperaemic distal coronary pressure was significantly lower in the infarct-related artery. MR varied considerably between patients and was significantly higher in infarct areas at baseline (135 ± 38 vs. 118 ± 29 mmHg mL min/mL; P < 0.05), but not during hyperaemia (39 ± 18 vs. 35 ± 11 mmHg mL min/mL). The correlation between MR in infarct and reference areas was significant. Conclusion: To determine MR, distal coronary pressure measurements should be used. Hyperaemic MR in viable myocardium within the infarcted area is not higher when compared with the reference area. This supports the application of the established fractional flow reserve cut-off value in the setting of chronic MI.

Original languageEnglish
Pages (from-to)2320-2325
Number of pages6
JournalEuropean Heart Journal
Volume28
Issue number19
DOIs
Publication statusPublished - 1 Oct 2007

Cite this

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title = "Hyperaemic microvascular resistance is not increased in viable myocardium after chronic myocardial infarction",
abstract = "Aims: The present study compared microvascular resistance (MR) of viable myocardium in infarct areas with those in reference areas in patients with chronic myocardial infarction (MI). Methods and results: In 27 patients, MR (ratio distal coronary pressure and flow) of reference and viable infarct areas was calculated at baseline and during hyperaemia. H2 15O positron emission tomography (PET) was used to provide myocardial blood flow measurements. In infarct regions, H2 15O PET solely measures flow in viable myocardium, excluding flow in scar tissue. Distal coronary pressure was measured with a pressure wire in the infarct-related and reference artery. The average time between PET study and infarction was 3.3 ± 4.4 years. Mean hyperaemic distal coronary pressure was significantly lower in the infarct-related artery. MR varied considerably between patients and was significantly higher in infarct areas at baseline (135 ± 38 vs. 118 ± 29 mmHg mL min/mL; P < 0.05), but not during hyperaemia (39 ± 18 vs. 35 ± 11 mmHg mL min/mL). The correlation between MR in infarct and reference areas was significant. Conclusion: To determine MR, distal coronary pressure measurements should be used. Hyperaemic MR in viable myocardium within the infarcted area is not higher when compared with the reference area. This supports the application of the established fractional flow reserve cut-off value in the setting of chronic MI.",
keywords = "Infraction, Microcirculation, Physiology, Regional myocardial blood flow",
author = "Marques, {Koen M.} and Paul Knaapen and Ronald Boellaard and Nico Westerhof and Lammertsma, {Adriaan A.} and Visser, {Cees A.} and Visser, {Frans C.}",
year = "2007",
month = "10",
day = "1",
doi = "10.1093/eurheartj/ehm309",
language = "English",
volume = "28",
pages = "2320--2325",
journal = "European Heart Journal",
issn = "0195-668X",
publisher = "Oxford University Press",
number = "19",

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TY - JOUR

T1 - Hyperaemic microvascular resistance is not increased in viable myocardium after chronic myocardial infarction

AU - Marques, Koen M.

AU - Knaapen, Paul

AU - Boellaard, Ronald

AU - Westerhof, Nico

AU - Lammertsma, Adriaan A.

AU - Visser, Cees A.

AU - Visser, Frans C.

PY - 2007/10/1

Y1 - 2007/10/1

N2 - Aims: The present study compared microvascular resistance (MR) of viable myocardium in infarct areas with those in reference areas in patients with chronic myocardial infarction (MI). Methods and results: In 27 patients, MR (ratio distal coronary pressure and flow) of reference and viable infarct areas was calculated at baseline and during hyperaemia. H2 15O positron emission tomography (PET) was used to provide myocardial blood flow measurements. In infarct regions, H2 15O PET solely measures flow in viable myocardium, excluding flow in scar tissue. Distal coronary pressure was measured with a pressure wire in the infarct-related and reference artery. The average time between PET study and infarction was 3.3 ± 4.4 years. Mean hyperaemic distal coronary pressure was significantly lower in the infarct-related artery. MR varied considerably between patients and was significantly higher in infarct areas at baseline (135 ± 38 vs. 118 ± 29 mmHg mL min/mL; P < 0.05), but not during hyperaemia (39 ± 18 vs. 35 ± 11 mmHg mL min/mL). The correlation between MR in infarct and reference areas was significant. Conclusion: To determine MR, distal coronary pressure measurements should be used. Hyperaemic MR in viable myocardium within the infarcted area is not higher when compared with the reference area. This supports the application of the established fractional flow reserve cut-off value in the setting of chronic MI.

AB - Aims: The present study compared microvascular resistance (MR) of viable myocardium in infarct areas with those in reference areas in patients with chronic myocardial infarction (MI). Methods and results: In 27 patients, MR (ratio distal coronary pressure and flow) of reference and viable infarct areas was calculated at baseline and during hyperaemia. H2 15O positron emission tomography (PET) was used to provide myocardial blood flow measurements. In infarct regions, H2 15O PET solely measures flow in viable myocardium, excluding flow in scar tissue. Distal coronary pressure was measured with a pressure wire in the infarct-related and reference artery. The average time between PET study and infarction was 3.3 ± 4.4 years. Mean hyperaemic distal coronary pressure was significantly lower in the infarct-related artery. MR varied considerably between patients and was significantly higher in infarct areas at baseline (135 ± 38 vs. 118 ± 29 mmHg mL min/mL; P < 0.05), but not during hyperaemia (39 ± 18 vs. 35 ± 11 mmHg mL min/mL). The correlation between MR in infarct and reference areas was significant. Conclusion: To determine MR, distal coronary pressure measurements should be used. Hyperaemic MR in viable myocardium within the infarcted area is not higher when compared with the reference area. This supports the application of the established fractional flow reserve cut-off value in the setting of chronic MI.

KW - Infraction

KW - Microcirculation

KW - Physiology

KW - Regional myocardial blood flow

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U2 - 10.1093/eurheartj/ehm309

DO - 10.1093/eurheartj/ehm309

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JO - European Heart Journal

JF - European Heart Journal

SN - 0195-668X

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