Monitoring in ICU can be performed both by means of clinical parameters as well as the use of medical monitors. Multimodality monitors which measure multiple vital parameters are usually incorporated in the bed side of all patients in the ICU. The common parameters are usually measured include the heart rate, the respiratory rate , the lug rate and the pulse oximetry. The pulse oximetry is a measure of the oxygen saturation in the blood. It is designated by the terminology SPO2 and it is usually measured by IR finger cups. Talking about oxygen, we also have carbon dioxide in the exhaled air or patients with ventilator is called as entilited carbondioxide measurements or capnography. We use the terminology ETCO2 for such measures. There are multiple other invasive measurements which we also use in routine ICU practise such as invasive arterial blood pressure monitoring, central venous pressure monitoring, intracranial pressure monitoring, cardiac output monitoring etc based on the requirement and the necessity of such monitoring purposes.