An immediate psychological response to a traumatic event, occurring within days to weeks of the experience. Symptoms can include shock, disbelief, emotional numbness, intrusive memories, nightmares, difficulty sleeping, irritability, and difficulty concentrating. An acute stress reaction is a normal response to an abnormal situation and does not necessarily mean the person will go on to develop PTSD — many people recover naturally with time, rest, and the support of those around them. However, if symptoms are severe, persistent beyond four weeks, or significantly interfering with daily life, professional support is recommended. Co-survivors and survivors alike may experience an acute stress reaction in the days and weeks following a cardiac arrest, often at a time when they feel pressure to focus on practical matters rather than their own wellbeing.
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