  A new formulation of (3+1)-dimensional anisotropic hydrodynamics is presented
that accounts nonperturbatively for the large longitudinal-transverse pressure
anisotropy and bulk viscous pressure in heavy-ion collisions. The
initialization of the anisotropic hydrodynamic stage is discussed, and a
comparison to standard viscous hydrodynamics for (0+1)- dimensional Bjorken
expansion is presented.
