The　equations　governing　the　evolution　of　quantum　vortex　defects　subject　to　twist　are　derived　in　standard　hydrodynamic　form.　Vortex　defects　emerge　as　solutions　of　the　Gross-Pitaevskii　equation,　that　by　Madelung　transformation　admits　a　hydrodynamic　description.　Here,　we　consider　a　vortex　defect　subject　to　superposed　twist　due　to　the　rotation　of　the　phase　of　the　wave　function.　We　prove　that,　when　twist　is　present,　the　corresponding　Hamiltonian　is　non-Hermitian　and　determine　the　effect　of　twist　on　the　energy　expectation　value　of　the　system.　We　show　how　twist　diffusion　may　trigger　linear　instability,　a　property　directly　related　to　the　non-Hermiticity　of　the　Hamiltonian.　We　derive　the　correct　continuity　equation　and,　by　applying　defect　theory,　we　obtain　the　correct　momentum　equation.　Finally,　by　coupling　twist　kinematics　and　vortex　dynamics　we　determine　the　full　set　of　hydrodynamic　equations　governing　quantum　vortex　evolution　subject　to　twist.