An Essentials of Anaesthesia for Undergraduates is explained in simple, brief and understandable. The speciality” Anaesthesia” has advanced several folds in recent times and has emerged as an important medical speciality with lot of subspecialities like Cardiac Anaesthesia, Paediatric, Obstetric and Neuro Anaesthesia. This volume has been written to enable the medical students who are unfamiliar with this speciality to acquire basic knowledge on Anaesthesiology through an understandable text. It is not possible to deal with the entire Anatomy, Physiology and Pharmacology within the scope of this book. An Essentials of Anaesthesia for undergraduates is released to fulfil the requirements of the MBBS students appearing for the examination.