Every breath on a T1 is a pressure breath. 'Volume' modes are pressure-regulated volume control. The vent aims at a VT by moving Pinsp, and it will surrender volume rather than walk through Plimit.
(S)CMV+ / APVcmv
Assist-control, volume targeted. You set VT, rate, Ti or I:E, PEEP, FiO2, Plimit. The T1 titrates inspiratory pressure. Use this when you want a number on the VT and you will watch Pplat.
PCV+
Assist-control, pressure targeted. You own Pinsp. VT is the dependent variable. Better when compliance is changing fast or you refuse to let pressure chase a fantasy VT.
SIMV+ / PSIMV+
Mandatory breaths plus pressure-supported sponts. Rarely the right transport mode for a freshly intubated, paralyzed patient. If turbulence is triggering, fix the trigger — don't hide in SIMV.
SPONT
PEEP + Psupport. No backup rate unless apnea ventilation is set. Fine for a true wean. Wrong for a blown pupil.
APRV / DuoPAP
Two CPAP levels, time-cycled. Phigh / Plow / Thigh / Tlow. Useful for stiff hypoxemic lungs if you know Tlow. Easy to stack or dump CO2 if you don't.
NIV and NIV-ST
Noninvasive. NIV-ST has a backup rate. Mask leak is expected; set leak compensation mentally and look at the waveform, not just the VTE tile.
HiFlowO2
High-flow nasal cannula mode on the same turbine. Flow and FiO2. Not a ventilator. Don't pretend it is.