Mechanical ventilation is a common therapeutic intervention in the intensive care unit (ICU). However, patients undergoing mechanical ventilation often experience agitation, unplanned extubation, patient-ventilator asynchrony, and even neuroendocrine-immune dysregulation, sympathetic overexcitation, and organ dysfunction due to discomfort and pain. Sedation therapy mitigates patient stress, enhances comfort, and ensures the smooth implementation of mechanical ventilation, making it an essential component of treatment for ventilated patients. Nevertheless, sedation may impact peripheral vascular tone, leading to hemodynamic instability and exacerbating inadequate peripheral perfusion. The precise implementation of sedation therapy to minimize adverse effects remains unclear. This prospective observational study will enroll critically ill patients with shock requiring mechanical ventilation. We will examine the effects of different sedation strategies-including sedation assessment protocols, sedative types, sedation duration, and daily awakening trials-on hemodynamics in this population. The study aims to explore optimized sedation regimens and provide evidence-based guidance for precision sedation therapy in clinical practice.
Critically ill patients requiring mechanical ventilation in the ICU frequently present with concurrent shock. The hemodynamic effects of sedative agents may further exacerbate circulatory instability. Studies indicate that 34% of ICU patients require simultaneous mechanical ventilation and vasoactive agent support. Among ARDS patients, over 60% develop shock, with approximately 65% necessitating vasopressor administration. Common sedatives like propofol and dexmedetomidine, despite being first-line choices, exhibit significant hemodynamic side effects: * \*\*Propofol\*\* induces hypotension (incidence: 20%) through vasodilation, sympathetic suppression, and bradycardia. * \*\*Dexmedetomidine\*\* causes hypotension and bradycardia at low doses, while triggering vasoconstriction via peripheral α-2 receptor activation at high doses-both scenarios reduce cardiac output. Additional factors affecting hemodynamic stability include sedation depth, duration, and daily awakening protocols. Deep sedation may mask dynamic assessment of fluid responsiveness, delaying shock resuscitation. Conversely, daily awakening-though reducing ventilation duration-may increase circulatory fluctuations through stress responses. These complex interactions necessitate balancing sedation efficacy and circulatory stability in shock patients, yet standardized protocols for this population remain lacking.
Study Type
OBSERVATIONAL
Enrollment
50
28-day vasoactive drug-free duration
Time frame: The observation period commenced upon enrollment and continued for 7 days or until ICU discharge, whichever occurred first.
Cumulative vasoactive drug dose during the first 7 days post-enrollment
Time frame: The observation period commenced upon enrollment and continued for 7 days or until ICU discharge, whichever occurred first.
Incidence of new-onset organ failure (respiratory/circulatory/renal) within 7 days
Time frame: The observation period commenced upon enrollment and continued for 7 days or until ICU discharge, whichever occurred first.
7-day sedation goal attainment rate
Time frame: 7-day sedation goal attainment rate
28-day all-cause mortality
Time frame: 28-day all-cause mortality
ICU-free days within 28 days
Time frame: ICU-free days are calculated as 28 days minus the total number of days (or partial days) spent in the ICU. All patients who die before day 28 or prior to ICU discharge are assigned 0 ICU-free days.
Delirium duration within 28 days，Incidence of delirium
Time frame: Delirium duration is defined as the number of days the patient was alive and had documented delirium. For patients discharged from the ICU before day 28, no further delirium assessments were conducted outside the ICU.
Ventilator-free days within 28 days
Time frame: Ventilator-free days (VFDs) within 28 days are defined as the number of days the patient was alive and free from invasive mechanical ventilation for at least 48 consecutive hours (successful extubation).
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