How to solve difficult side branch access?

Safe guidewire placement in the main vessel (MV) and in the side branch (SB) does represent the key point for successful percutaneous coronary interventions (PCI) in bifurcated lesions. During bifurcation PCI, SB wiring is systematically performed as a first step and is often repeated ("rewiring") during the procedure in order to treat the SB after MV stenting. Wiring and rewiring are crucial phases of bifurcation PCI which require, in the most complex cases, specific operator experience. In the present paper, the classic SB wiring techniques necessary for routine bifurcation interventions (antegrade and pullback wiring technique) as well as "advanced" wiring techniques ("reverse wire" technique, Venture-facilitate wiring, MV balloon predilation or debulking) are described. Moreover, the rewiring technique is discussed in detail, with particular attention on the tips and tricks which may facilitate the achievement of optimal result with provisional stenting (pullback rewiring) and help manage bail out situations like acute SB flow impairment after MV stenting.