Propofol Injection Pain: New Device Offers Relief During Surgery

Propofol, a widely used intravenous anesthetic, is known for its effectiveness in inducing anesthesia, but it frequently causes pain upon injection. New research suggests a simple, non-pharmacological intervention – a pressure vibration device – can significantly reduce this discomfort, offering a potential alternative to medications like low-dose ketamine.

A randomized, double-blind, placebo-controlled trial published in Rapid Anesthesia & Pain Medicine in January 2026, investigated the efficacy of this device. Researchers enrolled 300 adult patients undergoing elective surgery and divided them into three groups: a pressure vibration group, a low-dose ketamine group, and a placebo group. A total of 275 patients completed the study.

The pressure vibration device, applied proximal to the intravenous cannula, delivers localized pressure and vibration during propofol injection. The ketamine group received 50 µg/kg of ketamine, while the placebo group received a saline solution. All groups received propofol at a standardized dose of 2 mg/kg, with the initial 25% administered at a consistent rate. Pain levels were assessed using the McCrirrick and Hunter verbal rating score.

The results demonstrated a clear benefit for the pressure vibration device. Over half of patients (51.1%; 95% CI 42.4% to 59.8%) in the vibration group reported no pain during propofol injection, compared to 30.4% (95% CI 21.0% to 39.8%) in the placebo group and 33.0% (95% CI 23.3% to 42.6%) in the ketamine group (p=0.001). This suggests the device was more effective than placebo and comparable to low-dose ketamine in preventing injection pain.

severe pain was significantly less frequent in both the ketamine (5.5%; 95% CI 0.8% to 10.2%) and vibration (4.3%; 95% CI 0.2% to 8.5%) groups compared to the placebo group (18.5%; 95% CI 10.5% to 26.4%; p=0.001). Importantly, the study also assessed recall of injection pain one week after the procedure. Patients in the placebo group were significantly more likely to remember experiencing pain (55.4%) compared to those in the ketamine (37.4%) and vibration (26.1%) groups (p<0.001).

The incidence of pain with propofol injection is a well-recognized issue, affecting between 28% and 91% of patients. This discomfort can be distressing and may contribute to anxiety surrounding anesthesia. Current strategies to mitigate this pain often involve medications, such as low-dose ketamine, which, while effective, can have potential side effects.

This study offers a promising alternative. The pressure vibration device appears to provide comparable pain relief to ketamine without introducing additional adverse events. The non-pharmacological nature of the intervention is particularly appealing, as it avoids the potential risks associated with medication.

The researchers emphasize that the device works through a mechanism that likely involves modulating pain signals. The localized pressure and vibration may interfere with the transmission of pain impulses to the brain, effectively reducing the perception of discomfort.

While the findings are encouraging, it’s important to note that this is a single study, and further research is needed to confirm these results in larger and more diverse patient populations. Future studies could also investigate the optimal parameters for the pressure vibration device, such as the duration and intensity of the vibration, to maximize its effectiveness.

The implications of this research extend beyond patient comfort. Reducing injection pain could potentially improve the overall patient experience with anesthesia and surgery, leading to reduced anxiety and faster recovery times. The availability of a non-pharmacological option also provides clinicians with another tool to manage this common side effect of propofol administration.

As reported by Pharmacy Times, this innovation represents a step forward in optimizing anesthetic care and prioritizing patient well-being. The study highlights the potential of simple, non-invasive interventions to address common medical challenges.