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• W2897795626 abstract "Background: Circulating progenitor cells (CPCs) are involved in vascular repair and regeneration. Low levels of CPCs in patients with CAD have been linked to adverse cardiovascular outcomes. The response of CPCs to transient myocardial ischemia in patients with CAD has not been studied before. We aimed to investigate the CPC response to exercise provoked myocardial ischemia (demand ischemia), and compare it to myocardial ischemia detected during pharmacological stress test (flow mismatch). Methods: 570 patients with stable CAD underwent 99mTc sestamibi myocardial perfusion imaging during exercise (69%), or pharmacological stress (31%). myocardial ischemia was defined as a new or worsening impairment in myocardial perfusion using a 17-segment model. CD34+ CPCs were enumerated by flow cytometry at rest and 30 min after stress testing. The change in CPC count was compared between patients with and without myocardial ischemia using mixed linear models. Results: Mean age was 63±9 years, 76% males, 36% with previous myocardial infarction. The incidence of myocardial ischemia was 31% and 41% during exercise and pharmacological stress test, respectively. No difference was observed in resting CPC between patients undergoing exercise vs pharmacological stress test, nor between patients with or without myocardial ischemia. However, patients who developed myocardial ischemia during exercise stress had a significant decrease in CPC with stress in comparison to those without myocardial ischemia (-12% vs 4%, respectively, p=0.006). Furthermore, the change in CPCs was inversely correlated with the magnitude of myocardial ischemia (R=-0.13, p=0.023), suggesting a greater CPC reduction with larger ischemic burden. These findings remained significant even after adjustment for age, gender, race, BMI, previous myocardial infarction, resting levels of CPCs and hematocrit change with stress. No difference was observed in CPC response to pharmacological stress test (change of -1% vs 3%, for patients with and without myocardial ischemia, respectively, p=0.96). Conclusion: Exercise stress-induced myocardial ischemia is associated with a decrease in CPC counts, likely due to increased homing of stem cells to the ischemic myocardium. Whether the extent of CPC uptake has prognostic implication, or whether the CPC response can be altered with intervention needs further investigation." @default.
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• W2897795626 date "2017-03-07" @default.
• W2897795626 modified "2023-09-27" @default.
• W2897795626 title "Abstract P326: Myocardial Ischemia and Mobilization of Circulating Progenitor Cells" @default.
• W2897795626 doi "https://doi.org/10.1161/circ.135.suppl_1.p326" @default.
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