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The Open Artery Hypothesis: Past, Present, and Future
1Cardiovascular Division of the Department of Medicine, the West Roxbury Veteran's Administration & Brigham and Women's Hospitals, Harvard Medical School, Boston Massachusetts.
Insights
The Corrected TIMI Frame Count method offers a more precise and quantitative assessment of coronary blood flow after reperfusion therapy compared to the older TIMI Flow Grade. This advancement improves statistical power and simplifies reporting for better outcomes in acute coronary syndromes.
Area of Science:
- Cardiology
- Interventional Cardiology
Background:
- Reperfusion therapy is crucial for survival in acute coronary syndromes.
- The TIMI Flow Grade classification has limitations in assessing coronary blood flow.
- Early and complete reperfusion are key to survival benefits.
Purpose of the Study:
- To introduce and advocate for the Corrected TIMI Frame Count (CTFC) method.
- To highlight the advantages of CTFC over the TIMI Flow Grade.
- To review the open artery hypothesis and recent advancements in reperfusion assessment.
Main Methods:
- Comparison of CTFC with TIMI Flow Grade for coronary blood flow assessment.
- Review of the historical context of the open artery hypothesis.
- Analysis of recent developments in reperfusion strategies.
Main Results:
- CTFC is a continuous quantitative variable, unlike the categorical TIMI Flow Grade.
- CTFC provides a more accurate assessment by not assuming normal flow in non-culprit arteries.
- CTFC simplifies reporting and increases statistical power for analyzing reperfusion efficacy.
Conclusions:
- The CTFC method offers significant advantages over the TIMI Flow Grade for assessing coronary reperfusion.
- CTFC allows for more intuitive and statistically powerful reporting of blood flow.
- Advancements in CTFC contribute to a better understanding of the open artery hypothesis and reperfusion strategies.
Abstract:
The survival benefit following a reperfusion strategy, be it pharmacologic or mechanical, appears to be due to both full and early reperfusion. While the TIMI Flow Grade classification scheme has been a useful tool to assess coronary blood flow in acute syndromes, it has several limitations. A newer method of assessing coronary blood flow called the Corrected TIMI Frame Count method has the following advantages: (1) it is a continuous quantitative variable rather than a categorical qualitative variable; (2) the flow in the non-culprit artery is not assumed to be normal as it is in the assessment of TIMI Grade 3 Flow; (3) there is simplified reporting of reperfusion efficacy through the use of a single number instead of expressing the data in 2 to 4 categories; (4) because a single number rather than 4 categories is used to report the data, there is more efficient use of the dataset by increasing the statistical power; and finally (5) coronary flow can be expressed in intuitive terms (e.g. time or cm/sec for strategy A versus time or cm/sec for strategy B). This paper reviews the history of the open artery hypothesis and recent advances in the field.