This book discusses some aspects of adult and pediatric intensive care in day-to-day practice. The updated and evidence-based medical knowledge contained herein is useful in early diagnosis and better management of acute and critically ill patients. The chapters discuss comprehensive and systemic approaches for the management of critically ill adult, trauma, and pediatric patients. Topics addressed include professionalism and teamwork; the management of delirium, bleeding, and thrombosis in pediatric patients; renal replacement therapy; and the management of critically ill trauma patients and mass causality patients during the COVID-19 pandemic. This book provides essential medical knowledge for all grades of physicians working in intensive and critical care as well as clinical pharmacists, nurses, and technicians.