In this edition, the most recent advances in drugs, equipment, and techniques have been incorporated. Cardiopulmonary resuscitation (CPR) guidelines are based on American Heart Association (AHA) 2020 guidelines. All the chapters have been thoroughly revised and updated. This edition has been divided into nine sections providing a basic knowledge of physiology and pharmacology related to anesthesia, anesthesia machine and equipment, various anesthetic drugs and techniques in normal subjects and patients suffering from medical ailments, and subspecialty management.