Virtual Reality for SCD VOC

Vaso-occlusive crisis is a common and debilitating complication of sickle cell disease and is a frequent reason for treatment in acute care settings, including infusion centers and emergency departments. Opioid analgesics remain the mainstay of treatment for acute vaso-occlusive pain, but many patients continue to experience substantial pain, distress, and functional impairment despite standard therapy. Scalable, low-risk, non-pharmacologic adjuncts are needed to improve pain management during acute vaso-occlusive episodes. Virtual reality is a promising non-pharmacologic approach to pain management that may reduce pain through immersive distraction, modulation of attention, and enhanced patient engagement. Prior studies suggest that virtual reality may reduce acute and chronic pain in some clinical settings, but the effect may vary by population and condition. Limited data are available regarding the use of virtual reality for acute vaso-occlusive pain in adults with sickle cell disease. This study is designed to evaluate the feasibility, tolerability, and preliminary analgesic effect of headset-based visual and audio interventions during infusion center treatment of vaso-occlusive crisis. This is a randomized, controlled, two-period crossover pilot study using a balanced incomplete block design. Participants will be enrolled during routine outpatient sickle cell disease clinic visits when they are clinically stable and not experiencing an acute vaso-occlusive crisis. After enrollment, participants will be eligible to receive study interventions during future qualifying infusion center visits for vaso-occlusive pain occurring within the study follow-up window. At each qualifying visit, study staff will confirm continued eligibility, medical appropriateness, and the participant's willingness to proceed before delivering the assigned intervention. Each participant will be randomized to receive two of three headset-based intervention conditions across two separate qualifying infusion center visits. The three conditions are: sham 2D headset control, consisting of non-interactive 2D visual content displayed on a fixed virtual screen with standardized audio; passive immersive 3D virtual reality, consisting of 360-degree or 3D immersive visual content with standardized audio without controller-based interaction; and active immersive interactive 3D virtual reality, consisting of immersive interactive virtual reality content with standardized audio and low-motion, seated controller-based interaction. Each intervention session is planned to last 45 minutes and will be delivered in addition to usual clinical care for vaso-occlusive crisis. Randomization will assign each participant to one of three possible intervention pairs: sham 2D plus passive 3D virtual reality, sham 2D plus active interactive 3D virtual reality, or passive 3D virtual reality plus active interactive 3D virtual reality. Within each pair, the order of interventions will be randomized to balance period and sequence effects. Participants and study staff will not be blinded to the intervention condition because the interventions are perceptible; however, use of a headset-based control condition and standardized scripts is intended to reduce differences in attention and expectancy across conditions. The primary outcome is pain burden during the first 60 minutes after intervention start, measured as area under the curve of 0-10 numeric rating scale pain scores. Pain scores will be collected before the intervention and at 15, 30, 45, and 60 minutes after intervention start. Secondary and exploratory outcomes include pain at 120 minutes, change in pain from baseline to 120 minutes, opioid administration summarized as morphine milligram equivalents, need for rescue analgesia, feasibility of intervention delivery, session completion, missing pain assessments, early discontinuation, headset-related symptoms, perceived immersion, and participant-reported likelihood of using the intervention again during future vaso-occlusive crisis treatment. The study will enroll an anticipated convenience sample of approximately 20 to 25 participants based on the expected eligible infusion center population during the study period. The primary purpose of this pilot study is to estimate feasibility, tolerability, effect size, and variability to inform the design of a future larger efficacy trial.