Weighted blankets enter the ICU agitation debate with a randomized test at AnMed
Project HARMONIA is taking a familiar comfort intervention and placing it inside a controlled critical care framework. The study will evaluate whether a weighted blanket can reduce agitation in adults hospitalized in the intensive care unit, where restlessness can complicate monitoring, increase medication exposure, and interfere with essential care. The trial compares a weighted blanket against a standard blanket plus usual comfort measures, with close bedside observation throughout each session.
The design is straightforward in concept and clinically pointed in execution. Adults with a Richmond Agitation-Sedation Scale score from +1 to +3 will be randomized in a 1:1 ratio after a small three-patient feasibility pilot. One arm receives a protocol-selected, wipe-clean weighted blanket for 15 minutes to 2 hours, up to twice daily, while the control arm receives a standard blanket and comparable nursing attention. The primary endpoint is the change in RASS from baseline to 1 hour.
A single point in time may decide whether a low-tech intervention is useful at the bedside.
Why agitation matters in critical illness
Agitation in the ICU is not a minor behavioral nuisance. In patients with critical illness, visible restlessness can reflect pain, dyspnea, delirium, unfamiliar surroundings, sleep disruption, or the physiologic stress of invasive care. Even mild escalation on the RASS can affect the safety of lines, drains, ventilators, and staff interactions. It can also trigger as-needed sedative or anxiolytic medication, which may calm the patient but can also cloud neurologic assessment, prolong immobility, and complicate liberation from mechanical ventilation.
The study’s rationale rests on a plausible sensory mechanism. Weighted pressure may offer a form of deep-touch input that promotes calm, improves perceived security, and reduces motor restlessness without adding a drug burden. In a unit where stimulation is constant and patients often have little control over their surroundings, a nonpharmacologic intervention that can be delivered quickly by nursing staff has practical appeal. The trial will test whether that plausibility translates into measurable change in agitation scores rather than relying on comfort alone.
How the trial is structured at the bedside
Project HARMONIA is a single-center, mixed-methods study conducted in medical/surgical, neuroscience, and cardiac intensive care units at AnMed Health in Anderson, South Carolina. The randomized phase plans to enroll 200 adults after the pilot cohort. Patients must be 18 years or older, admitted to a participating unit, able to consent directly or through a legally authorized representative, and clinically appropriate for blanket use as judged by the care team. The protocol also requires a baseline RASS of +1 to +3.
Several exclusion criteria reflect the realities of critical care safety. Pregnancy, open wounds or burns covering more than 20% of body surface area, documented claustrophobia, inability to regulate temperature, orthopedic injury that makes blanket pressure inappropriate, limb restraints, and anticipated ICU discharge within 24 hours all rule out participation. Those limits make sense for an intervention that is physically delivered and must not interfere with skin integrity, thermoregulation, or mobility precautions.
Blinding is not part of the design, and that choice is unavoidable in a blanket study. Patients and bedside nurses will know which blanket is being used, which means the trial must lean on structured outcome measurement and careful attention control to reduce bias. The comparison group is not simply “no treatment.” It receives a standard blanket, usual comfort measures, and similar nursing contact, which helps isolate the incremental effect of weight from the effect of attention itself.
The primary endpoint centers on a one-hour shift in RASS
The primary outcome is the change in Richmond Agitation-Sedation Scale score from immediately before the session to 1 hour after initiation. RASS scores range from -5 to +4, with 0 indicating alert and calm. Positive values reflect increasing agitation, and negative values reflect deeper sedation. The protocol defines the change as the 1-hour score minus the baseline score, then compares that shift between groups.
That endpoint choice is clinically meaningful because it captures early response at the bedside, where agitation management decisions are made in real time. A one-hour window is short enough to reflect immediate physiologic and behavioral effects, but long enough to observe whether the intervention alters the patient’s state beyond the first few minutes of contact. The study also recognizes a key interpretive issue: a negative change does not automatically equal clinical improvement, because deeper sedation can blunt agitation while also obscuring alertness.
Safety monitoring and medication use may matter as much as the blanket itself
The secondary outcomes move beyond a single score. Investigators will track as-needed sedative and anxiolytic medication administrations during the two hours after each session, along with heart rate, systolic blood pressure, and diastolic blood pressure at baseline, 30 minutes, 1 hour, and 2 hours when sessions extend that long. The study also includes ICU length of stay, duration of mechanical ventilation, tolerance of the intervention, and adverse events.
Those measures matter because an intervention can appear calming while still creating a burden at the bedside. A weighted blanket might reduce PRN medication use if it lowers agitation without suppressing arousal. It could also do nothing more than shift perceived comfort while leaving medication needs unchanged. Physiologic tracking is important here: if weighted pressure produces measurable changes in blood pressure, heart rate, or respiratory rate, that pattern may help explain whether the effect is primarily behavioral, autonomic, or simply nonspecific reassurance.
Implementation questions are built into the protocol
Project HARMONIA does more than ask whether the blanket works. It also includes an embedded implementation evaluation looking at protocol adherence, feasibility, nurse satisfaction, and barriers and facilitators to use. Interviews with nurses, patients or family members, and physician champions will explore how the intervention is experienced and whether it could be sustained.
That matters in critical care, where even low-cost interventions can fail if they are awkward to apply, difficult to standardize, or poorly accepted by staff. A blanket that is effective in principle but rarely used in practice would have limited value. A weight-based intervention that fits nursing workflow, preserves safety, and is well tolerated could have broader reach than many pharmacologic add-ons, especially in settings that want to reduce unnecessary sedation.
The trial’s timeline runs from an actual study start on 2026-10-01 to an estimated primary completion on 2027-08-01 and overall completion on 2027-12-31. No results are posted yet. The central question is still unresolved: whether a simple, nonpharmacologic tactile intervention can meaningfully shift agitation in critically ill adults without creating new safety problems or operational burdens.