The National Early Warning Score (NEWS2) is a standardised clinical tool used in NHS hospitals to detect and respond to deterioration in patients’ clinical condition, and to identify those at risk of cardiac arrest, sepsis, or other life-threatening deterioration. The current version, NEWS2, replaced the original NEWS system in 2017 and includes a specific track to detect the risk of type 2 respiratory failure in patients with conditions such as COPD.
NEWS2 scores six physiological parameters routinely measured in clinical care: respiration rate, oxygen saturation, systolic blood pressure, pulse rate, level of consciousness (using the ACVPU scale: Alert, Confusion, Verbal, Pain, Unresponsive), and temperature. Each parameter is scored 0 to 3 based on how far it deviates from normal, and the scores are summed to a total. A score of 5 or more (or 3 or more in any single category) triggers an urgent clinical review; higher scores trigger more rapid escalation to a medical emergency team.
In the context of cardiac arrest prevention, NEWS2 is a core tool for identifying patients who are deteriorating before a full arrest occurs. Studies show that most in-hospital cardiac arrests are preceded by detectable physiological deterioration that NEWS2 can capture. Early escalation based on NEWS2 triggers can interrupt the deterioration cascade and prevent cardiac arrest from occurring.
NEWS2 is also used to guide post-resuscitation monitoring, tracking recovery in patients who have been resuscitated from cardiac arrest to detect any deterioration signalling re-arrest risk. The Royal College of Physicians (RCP) developed and maintains NEWS2, which is mandated across NHS acute hospitals in England.
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