Sleep disturbances are common in patients with mechanical ventilation during intensive care unit (ICU) stay. Persistent sleep disturbances are associated with negative outcomes, including increased sensitivity to pain, increased risk of delirium and cardiovascular events, and delayed weaning from mechanical ventilation.~Dexmedetomidine and ketamine are both suggested for sedation and analgesia in ICU patients. Previous studies showed that night-time dexmedetomidine infusion may improve sleep quality in ICU patients with mechanical ventilation, the effect is dose-dependent. However, sedative dose dexmedetomidine increases adverse events inculding bradycardia and hypotension. Recent studies suggest that ketamine/esketamine may also improve sleep quality. But even low-dose ketamine/esketamine increases adverse events including psychiatric and dissociative symptoms. We suppose that combined use of low-dose dexmedetomidine and esketamine may produce synergic effects in improving sleep quality in ICU patients with less adverse events.~The purpose of this trial is to observe whether night-time infusion of low-dose dexmedetomidine-esketamine combination can improve sleep structure of patients with mechanical ventilation in ICU patients with mechanical ventilation and the safety of this regimen.
Dexmedetomidine and ketamine are both suggested for sedation and analgesia in ICU patients with mechanical ventilation. Recent studies suggest that low-dose dexmedetomidine or ketamine/esketamine may improve sleep quality of ICU patients. The purpose of this trial is to observe whether night-time infusion of low-dose dexmedetomidine-esketamine combination can improve sleep structure of patients with mechanical ventilation in the ICU.