The following modes of ventilation may be used for weaning off patients from mechanical ventilation, EXCEPT:: (A) Controlled mechanical ventilation (CMV), (B) Synchronized intermittent mandatory ventilation (SIMV), (C) Pressure suppo ventilation (PSV), (D) Assist-control ventilation (ACV)
Answer is A. Controlled Mechanical Ventilation (CMV) is best reserved for patients capable of little or no ventilator suppo. Ref: Sho Textbook of Anaesthesia By Ajay Yadav 2nd Edition, Pages 182-3.