Gas Monitoring and Pulse Oximetry presents an extensive examination of the ventilation of the patient’s lungs. It discusses the administration of oxygen and inhalation of anaesthetics of patients. It addresses the methods of oxygen and carbon dioxide monitoring. Some of the topics covered in the book are the introduction to the use of capnogram; definition of oxygraphy and anesthetigraphy; mechanism of pulse oximetry; solubility of gases or vapors in water, blood, and tissue; description of anaesthesia machine with circle breathing system; and malfunction of valves and carbon dioxide absorber. The definitions and description of Mapleson breathing systems are fully covered. An in-depth account of the Jackson-Rees system is provided. The mechanism of Bain system, Lack system, and Magill system are completely presented. A chapter is devoted to description of titration of depth of anesthesia. Another section focuses on the analysis of the concentration effect, diffusion hypoxia, and cardiogenic oscillations. The book can provide useful information to clinicians, doctors, students, and researchers.