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This is prospective cohort study in subjects with a planned percutaneous coronary intervention (PCI) of their chronic total occlusion (CTO). The study will enroll subjects who have been scheduled for a clinically-indicated cardiac catheterization, and will evaluate coronary microvascular function in all subjects meeting inclusion criteria with a coronary flow wire. Evaluation of coronary microvascular function may be performed using indirect methods, however the rationale behind the present study is to directly measure microvascular function using direct coronary flow measurements, since the subjects in the study are to undergo a clinically-indicated cardiac catheterization. The overall purpose of the study is to define the presence and severity of coronary microvascular dysfunction subjects with CTO. The study is designed to enroll 50 subjects with CTO in the span of 3 years. There will be a 6-month assessment of the outcomes of death and cardiovascular death. As the study includes FDA approved tests, there will be no safety endpoint per se, however there will be a mechanism for monitoring adverse events as will be described in detail.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Subjects with Chronic Total Occlusion (CTO) | Other | All subjects in this study have been scheduled for a clinically-indicated cardiac catheterization. |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Directly measure microvascular function using direct coronary flow measurements | Other | The study will enroll subjects who have been scheduled for a clinically-indicated cardiac catheterization, and will evaluate coronary microvascular function in all subjects meeting inclusion criteria with a coronary flow wire. Evaluation of coronary microvascular function may be performed using indirect methods, however the rationale behind the present study is to directly measure microvascular function using direct coronary flow measurements, since the subjects in the study are to undergo a clinically-indicated cardiac catheterization. The overall purpose of the study is to define the presence and severity of coronary microvascular dysfunction subjects with CTO. |
| Measure | Description | Time Frame |
|---|---|---|
| Baseline myocardial quality of the CTO-supplied vascular bed. | Characterize the microvascular resistance of the donor vessel to 50 CTOs as it relates to vascular bed quality of the CTO-supplied territory. Scaled from 0-102, with 102 being worse than 0. 1. Baseline myocardial quality | Day of procedure |
| IMR of opened CTO vessel | Following CTO PCI, IMR of the opened vessel will be measured. Scale is linear and 1-100 units, higher numbers being worse outcome. 3) Change in SAQ from baseline to 6 months | 6 months |
| Change in exercise time on Bruce protocol baseline | Change in exercise time from baseline to 6 months post-PCI will be measured. Scale is linear and measured in seconds (can be a negative number), with higher numbers indicating a favorable outcome. | 6 months |
| Change in SAQ from baseline to 6 months | Change in Seattle Angina Questionnaire (SAQ) from baseline to 6 months post-PCI will be measured. Scale is linear and 0-100 units, with higher numbers indicating a favorable outcome. | 6 months |
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Inclusion Criteria:
Exclusion Criteria:
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| Name | Affiliation | Role |
|---|---|---|
| John Blair, MD | University of Chicago | Principal Investigator |
| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| University of Chicago Medical Center | Chicago | Illinois | 60637 | United States |
| PubMed Identifier | Type | Citation | Retractions |
|---|---|---|---|
| 26673558 | Background | Writing Group Members; Mozaffarian D, Benjamin EJ, Go AS, Arnett DK, Blaha MJ, Cushman M, Das SR, de Ferranti S, Despres JP, Fullerton HJ, Howard VJ, Huffman MD, Isasi CR, Jimenez MC, Judd SE, Kissela BM, Lichtman JH, Lisabeth LD, Liu S, Mackey RH, Magid DJ, McGuire DK, Mohler ER 3rd, Moy CS, Muntner P, Mussolino ME, Nasir K, Neumar RW, Nichol G, Palaniappan L, Pandey DK, Reeves MJ, Rodriguez CJ, Rosamond W, Sorlie PD, Stein J, Towfighi A, Turan TN, Virani SS, Woo D, Yeh RW, Turner MB; American Heart Association Statistics Committee; Stroke Statistics Subcommittee. Heart Disease and Stroke Statistics-2016 Update: A Report From the American Heart Association. Circulation. 2016 Jan 26;133(4):e38-360. doi: 10.1161/CIR.0000000000000350. Epub 2015 Dec 16. No abstract available. | |
| 25117457 |
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