This document provides an overview of monitoring during anaesthesia and its complications. It discusses the importance of monitoring to ensure safety and avoid issues. The key aspects that should be monitored include circulation, ventilation, oxygenation, temperature and blood loss. Basic monitoring involves monitoring pulse, BP, breathing etc. Advanced monitoring uses tools like ECG, pulse oximetry, capnography and invasive blood pressure monitoring. Complications of different monitors and how to prevent them are also outlined.