Shortfuel has stated the only time you have to refer to the QRH with OEI. If you have a straightforward engine out, even if you have pressed the fire push button, and have no other failures, then the Vapp calculated by the MCDU will suffice.
So if you have OEI, the fire push button pressed, and airframe ice accretion, then you should refer to 2.32 for the Vapp increment. This is due to it not being advisable to use bleed air to de-ice the wings.