Patients receiving mechanical ventilation should have a formal assessment of readiness for weaning. Which of the following are essential assessments before extubation? Select all that apply.

Stable, intact respiratory drive and ability to initiate spontaneous respirations.

Heart rate of 190 bpm.

Respiratory rate of 30 breaths per minute.

Hemodynamically stable.

Difficult to arouse and not following commands.

Reversal of underlying cause or condition.