Figure 1.

The dual-operator approach and procedure-related complications: multivariable analysis by outcomes for the unmatched (a) and propensity score-matched population (b). The association between the DO vs. SO approaches and outcomes were adjusted for gender, diabetes, previous stroke, previous myocardial infarction, previous PCI, previous coronary artery bypass graft, smoking status, psoriasis, hypertension, kidney disease, chronic obstructive pulmonary disease, Killip class IV, age, weight, contrast used in PCI, radiation dose used in PCI, annual site volume, annual operator volume, and annual operator CTO volume. CI, confidence interval; DO, dual operator; PCI, percutaneous coronary intervention; SO, single operator.