Critical care or Intensive care comprises the diagnosis, medication and treatment of diseases in human in its extreme level. Critically ill patients are taken care by a coordinated team and specialists called Intensivist. The Intensivist needs to be well acquainted with a broad range of conditions among critically ill patients and should be expert in the devices and technological procedures used. Critical care includes the provision of investigation, diagnosis, and treatment of acute illness, systems management and patient safety, organ system support, ethics, end-of-life care, and support of families. It might treat patients with complications from surgery, accidents, infections and severe breathing problems. Critical care is usually is done in intensive care unit (ICU) or trauma centers where the patient is provided with contact attention by a team of specially trained health providers. The ICU staff includes doctors, nurses, clinical nurse specialists, respiratory therapists, physical therapists, nurse practitioners, physician assistants, pharmacists, dietitians, social workers, and chaplains. Hospitals may have ICU designed for specific medical specialty or patient like Neonatal intensive care unit (NICU), Pediatric intensive care unit (PICU), Psychiatric intensive care unit (PICU), Cardiovascular intensive care unit (CVICU), Coronary care unit (CCU), Post-anesthesia care unit (PACU), High dependency unit (HDU) and Surgical Intensive Care Unit (SICU).