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(Circulation. 2001;104:2784.)
© 2001 American Heart Association, Inc.

Clinical Investigation and Reports

Collateral Function in Chronic Total Coronary Occlusions Is Related to Regional Myocardial Function and Duration of Occlusion

Gerald S. Werner, MD; Markus Ferrari, MD; Stefan Betge, MD; Oliver Gastmann, MD; Barbara M. Richartz, MD; Hans R. Figulla, MD

From the Clinic for Internal Medicine III, Friedrich-Schiller-University Jena, Jena, Germany.

Correspondence to Gerald S. Werner, MD, Klinik für Innere Medizin III, Friedrich-Schiller-Universität, Erlanger Allee 101, D-07740 Jena, Germany. E-mail gerald.werner{at}med.uni-jena.de

Background— Collateral circulation can maintain myocardial function and viability in chronic total coronary occlusion (TCO). The present study evaluates the relation of myocardial function and duration of occlusion to collateral function.

Methods and Results— A total of 50 patients underwent a successful recanalization of a TCO (>4 weeks’ duration). Collateral function was assessed by intracoronary Doppler and pressure recordings before the first balloon inflation and after PTCA had been completed. Collateral function was assessed by Doppler- (CFI_D) and pressure-derived collateral flow indices (CFI_P), as well as indices of collateral (R_Coll) and peripheral resistance (R_P). Patients with normokinesia had lower R_Coll (4.9±2.5 versus 11.8±8.2 mm Hg · cm^-1 · s^-1; P=0.033) and lower R_P (3.8±1.9 versus 6.1±4.1 mm Hg · cm^-1 · s^-1; P=0.031) than those with akinesia. Patients with akinesia and a TCO duration of 3 months had the highest R_Coll and R_P, whereas those with akinesia and a longer TCO duration had similar collateral function as patients with normokinesia. After PTCA, CFI_D and CFI_P decreased from 0.37±0.20 to 0.21±0.17 (P<0.001) and from 0.44±0.12 to 0.36±0.11 (P<0.001), respectively, with an increase in R_Coll of 139±128% (P<0.001) and R_P by 65±99% (P=0.003). This attenuation of collateral function was less pronounced with epicardial collaterals than with intramyocardial collaterals.

Conclusions— Collateral function was better in patients with TCO and normal regional function than in those with impaired regional function. In the latter group, collateral function improvement was time dependent. After recanalization, the recruitable collateral function was attenuated because of an increase of R_Coll and R_P.

Key Words: collateral circulation • occlusion • hemodynamics • angioplasty

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