Do collaterals to infarct bed in STE-ACS patients undergoing emergent percutaneous coronary revascularization matter? An assessment of a prospective pool for in-hospital course.

BACKGROUND

Limited data exist on the role of coronary collaterals circulation (CCC) in patients with ST-elevation acute coronary syndrome (STE-ACS). This study aimed to assess CCC and the in-hospital course of patients with CCC undergoing primary percutaneous coronary intervention (pPCI).

METHODS

The study included consecutive STE-ACS patients undergoing pPCI. Good CCC was defined as Rentrop collateral score (RCS) of 2-3. Patients with good and poor CCC were compared regarding clinical characteristics, angiographic patterns, and hospital course.

RESULTS

In the sample of 4683 patients, mean age was 55.6 ± 11 years, and 78.8 % were male. Good CCC was observed in 499 (10.7 %) patients. The rate of intra-procedure slow-flow/no-reflow (SF/NR) was 29.9 % vs. 20.5 % (p < 0.001), and the rate of composite adverse clinical outcomes (CACO) was 21.2 % vs. 19 % (p = 0.225) for patients with good and poor CCC, respectively. Multivariable analysis identified left ventricular end-diastolic pressure (LVEDP), multi-vessel disease (MVD), and thrombus grade ≥4 as independent predictors of good CCC, with adjusted odds ratios of 0.98 [0.97-0.99], 1.69 [1.35-2.10], and 3.45 [2.64-4.52], respectively. In propensity-matched cohorts, the intra-procedure SF/NR rate was 29.9 % vs. 26.9 % (p = 0.292), and the rate of CACO was 21.2 % vs. 23.4 % (p = 0.403) for patients with good and poor CCC, respectively.

CONCLUSION

Angiographic evidence of good CCC in STE-ACS patients was limited. Good CCC was associated with a higher prevalence of MVD, high thrombus burden, and low pre-procedure LVEDP, resulting in a higher incidence of intra-procedure SF/NR. However, the CACO did not differ significantly between patients with good and poor CCC.