<prompt> The following modes of ventilation may be used for weaning off patients from mechanical ventilation, EXCEPT:Controlled mechanical ventilation CMVSynchronized intermittent mandatory ventilation SIMVPressure suppo ventilation PSVAssist-control ventilation ACV  <response>: 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. 