A sedation-hold (also called a spontaneous awakening trial or daily sedation interruption) is a planned, temporary reduction or complete suspension of sedative medications in a mechanically ventilated patient, allowing the clinical team to assess neurological function and determine whether the patient is ready to breathe independently and have their breathing tube removed.
In the intensive care unit following cardiac arrest, sedation is typically administered continuously to keep patients comfortable on the mechanical ventilator and to facilitate targeted temperature management (TTM). However, continuous sedation makes it difficult to assess brain function and recovery. The sedation-hold allows clinicians to observe whether patients can follow commands, open their eyes, or show purposeful movements, providing valuable information about neurological status. Crucially, neurological prognostication after cardiac arrest is typically deferred until at least 72 hours after rewarming from TTM, because sedative drugs accumulate in body fat during cooling and their effects can persist well beyond when the infusion is stopped.
Once the TTM protocol is complete and the patient has rewarmed, sedation is progressively reduced. A formal sedation-hold protocol involves stopping or significantly reducing sedatives at a planned time and assessing the patient’s response over 30 to 60 minutes. If the patient is not ready to breathe independently, sedation is recommenced. If they meet criteria (adequate respiratory effort, stable cardiovascular status, able to follow commands), a spontaneous breathing trial follows, and extubation is considered.
For families, the sedation-hold can be a tense and emotional moment: seeing a loved one begin to wake up and show signs of awareness after days of deep sedation can be both hopeful and frightening. Staff will explain what to expect and will be present throughout the process. Not all patients wake up immediately when sedation is reduced, and the pace of recovery varies considerably.
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