Clinical modifications induced by drugs during the perioperative period.

Total intravenous anesthesia (TIVA) can be defined as a technique in which general anesthesia is induced and maintained using only intravenous agents. TIVA has become more popular in recent times because of the pharmacokinetic and pharmacodynamic properties of propofol, the availability of short acting synthetic opioids, and the development of delivery systems. Significant differences in anatomy and physiology in adults and children and special needs of younger patients have important consequences on many aspects of anesthesia. Airway and respiratory complications are the most common causes of morbidity during general anesthesia in children. Knowledge of the functional anatomy of airways in children forms the basis in the understanding of the pathological conditions that may occur.