A seventy year old patient is posted for a surgery which is likely to last 4-6 hours. The best inhalational agent of choice for maintenance of anesthesia in such a case is:

D i.e. Desflurane - You should know that rate of induction of inhalational anesthetic agent is inversely propoional to its blood gas paition coefficient (i.e. the solubility of agent in blood & tissue). The speed of induction by inhalational anesthetics in descending order is Non pungency & rapid increase in alveolar anesthetic concentration, makes sevoflurane an excellent choice for smooth & rapid inhalational induction in pediatrics & adult population. Induction and recovery are very fast in desfluraneQ. Due to its sho action it is commonly used as anesthesia for OPD.