Key result
Normokinesia in CTO is linked to ~58% lower collateral resistance versus akinesia.
Why the study?
Collateral circulation can maintain myocardial function and viability in chronic total coronary occlusion, but its relationship to myocardial function and occlusion duration required evaluation.
How does regional myocardial function, duration of occlusion, and successful recanalization affect collateral function in patients with chronic total coronary occlusion?
Population
50 patients undergoing successful recanalization of a chronic total coronary occlusion of >4 weeks duration
Comparison
Normokinesia vs akinesia and shorter vs longer occlusion duration
Design
Observational physiological study
Authors
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Collateral recovery may be faster after shorter CTO durations; leaves open whether duration-stratified timing improves outcomes in trials.
Observational (n=50)
How does regional myocardial function, duration of occlusion, and successful recanalization affect collateral function in patients with chronic total coronary occlusion?
Absolute Event Rate: 4.9% vs 11.8%
p-value: p=0.033
Collateral function in chronic total occlusions is better in patients with normal regional myocardial function and attenuates immediately after successful recanalization due to increased collateral and peripheral resistance.
Werner et al. (2001) conducted an observational in Chronic total coronary occlusion (TCO) (n=50). Normokinesia vs. Akinesia was evaluated on Collateral resistance (R_Coll) (p=0.033). In patients with chronic total coronary occlusion, normokinesia was associated with lower collateral resistance compared to akinesia (4.9 vs 11.8 mm Hg·cm-1·s-1; P=0.033).
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