The Intensive Care Unit (ICU), also known as the Critical Care Unit is defined by the Task Force of the World Federation of Societies of Intensive and Critical Care Medicine (WFISCCM) as "an organized system for the provision of care to critically ill patients that provides intensive and specialized medical and nursing care, an enhanced capacity for monitoring, and multiple modalities of physiologic organ support to sustain life during a period of life-threatening organ system insufficiency." Mainly, the ICU's goal is to prevent a progressive deterioration in the physiologic state of a patient as the underlying disease is being managed. Intensive care units (ICUs) are vital for enhancing the survival of critically ill patients through the continuous monitoring and maintenance of their vital functions. Vital signs indicate the status of the patient’s life-threatening functions in the ICU. Continuous monitoring of patients’ vital signs or physiological functions aids in ensuring patient safety through awareness of critical changes in the patient’s health status, and it guides daily therapeutic interventions. Early recognition of patient deterioration and timely intervention are critical in saving patients’ lives. Subtle changes in vital signs such as respiratory rate, blood pressure, heart rate, temperature and oxygen saturation are early signs of clinical deterioration that may eventually lead to adverse events. Through continuous monitoring of vital signs, clinical deterioration can be identified well in advance of any adverse events occurring. In order to recognize an acute change in a patient’s physiology, their vital signs must first be accurately assessed.