Fig. 3

Changes in regional left ventricular function in segments in the CTO territory in Rentrop grade 2–3 collaterals versus grade 0–1 collaterals, comparing CTO PCI versus no-CTO PCI. Change in percentage segmental wall thickening (SWT) in all segments (a) and dysfunctional segments (b) in the CTO territory comparing Rentrop grade 2–3 collaterals versus grade 0–1 collaterals. Recovery of SWT was compared between baseline and 4 month follow-up