Correlation of increased corrected TIMI frame counts and the topographical extent of isolated coronary artery ectasia
Wei Wu1, Shuyang Zhang1, Yuchao Guo2
1Department of Cardiology, Peking Union Medical College & Chinese Academy of Medical Science, Peking Union Medical College Hospital, No.1 Shuai Fu Yuan, Beijing, 100730, China.
Insights
The extent of coronary artery ectasia (CAE) correlates with reduced blood flow, measured by corrected TIMI frame counts (CTFC). Estimated ectatic area (EEA) best predicts CTFC, highlighting its importance in evaluating flow in CAE patients.
Area of Science:
- Cardiology
- Interventional Cardiology
- Vascular Biology
Background:
- Coronary artery ectasia (CAE) is a condition affecting coronary arteries.
- The relationship between CAE extent and blood flow reduction is not fully understood.
Purpose of the Study:
- To investigate the association between topographical parameters of isolated CAE and corrected TIMI frame counts (CTFC).
- To identify predictors of reduced coronary flow in CAE patients.
Main Methods:
- Studied topographical parameters (linear dimension, estimated ectatic area) in 77 isolated CAE patients.
- Determined CTFC using angiographic frame counts for each coronary artery.
Main Results:
- Right coronary artery (RCA) was most frequently affected.
- RCA and left circumflex (LCX) showed significantly greater linear dimension and estimated ectatic area compared to the left anterior descending (LAD) artery.
- CTFCs were significantly higher in RCA and LCX than LAD.
- Estimated ectatic area (EEA) was the strongest predictor of CTFC.
Conclusions:
- The severity of CAE topographical extent correlates with increased CTFC.
- EEA is crucial for evaluating decreased coronary flow in isolated CAE.
Background:
The precise relationship between increased thrombolysis in myocardial infarction (TIMI) frame counts and the topographical extent of isolated coronary artery ectasia (CAE) has not been fully explained. New parameters of linear dimension (LD) and the estimated ectatic area (EEA) together with the diameter and ectasia ratio may be associated with the corrected TIMI frame count (CTFC) in isolated CAE patients.
Methods:
The topographical parameters of ectatic coronary arteries and/or segments of 77 isolated CAE patients were consecutively studied. The CTFC for each coronary artery was determined by angiographic frame count.
Results:
Right coronary artery (RCA) was the most frequently affected. The RCA and left circumflex (LCX) had significantly longer LD (p < 0.001 for both), and greater EEA (p < 0.001 for both) than those of left anterior descending artery (LAD). Similarly, the RCA and LCX have higher CTFCs (p = 0.001 and p = 0.008, respectively) than LAD. All topographic parameters and CTFCs were positively correlated with Markis classification. Linear regression analyses revealed that CTFCs were strongly correlated with diameter, LD, ectasia ratio and EEA, while EEA was the best predictor for the CTFC. Among multiple linear and nonlinear regression models, the cubic model between the CTFC and EEA exhibits the best Goodness-of-Fit.
Conclusion:
The severity of the topographical extent of CAE was significantly correlated with increased CTFCs. Both the linear dimension and ectatic diameter (combined as EEA) were important for evaluating decreased coronary flow in isolated CAE patients.
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