Effective clinical trial recruitment strategies are fundamental to the success of medical research, particularly in high-pressure environments. In emergency medicine, researchers often worry that lengthy or complex Participant Information Leaflets (PILs) might deter potential participants. Consequently, many investigators strive to create more visually appealing and readable documents to encourage engagement. A recent Study Within a Trial (SWAT) conducted in a UK emergency department rigorously tested this assumption.

The study compared a standard, text-heavy PIL with an optimized version designed for better readability and visual appeal. Specifically, the optimized leaflet featured a reduced word count and an enhanced layout. Researchers aimed to determine if these modifications could improve recruitment rates in an environment where patients must make decisions quickly. However, the findings suggest that the presentation of information may be less influential than previously thought.

Evaluating Clinical Trial Recruitment Strategies in Emergency Settings

This randomized SWAT was embedded within a host trial involving 271 eligible patients. Participants were randomly assigned to receive either the conventional PIL or the optimized version. Therefore, the researchers could directly compare how design influenced consent rates and patient decision-making. Despite the effort to improve the document's accessibility, the recruitment rates remained nearly identical between the two groups. The optimized PIL group showed a 47.1% recruitment rate, while the conventional group achieved 48.9%. This difference was not statistically significant.

Furthermore, recruited participants completed a Decision-Making Questionnaire to evaluate the value of the information provided. Interestingly, the results showed no significant differences in how patients perceived their decision-making process across the two groups. This indicates that while readability is generally a goal for ethical reasons, it may not function as a primary lever for increasing enrollment. Moreover, the study highlights that in emergency settings, factors other than leaflet design likely play a more dominant role in a patient's choice to participate.

While the study found no quantitative benefit for recruitment, providing clear information remains an ethical necessity. Future clinical trial recruitment strategies might need to focus more on the timing of the approach or the interpersonal interaction between the researcher and the patient. In conclusion, simplifying the visual and linguistic complexity of leaflets is good practice but may not solve the systemic challenges of trial recruitment in acute care.

Frequently Asked Questions

Does a better PIL design lead to higher trial participation?

No, this SWAT demonstrated that an optimized, visually appealing leaflet did not significantly increase recruitment rates compared to a standard version in an emergency department setting.

Did the simplified leaflet help patients make better decisions?

Based on the Decision-Making Questionnaire results, there were no significant differences in how participants valued the information provided, regardless of whether they received the optimized or conventional leaflet.

What should researchers focus on if leaflet design doesn't boost recruitment?

While clear information is essential for ethics, researchers should explore other recruitment strategies such as improving the timing of consent discussions and enhancing the relationship between clinical staff and potential participants.

References

Sherman R et al. A randomised Study Within a Trial (SWAT) to determine if participant information leaflet design affects recruitment rate into an interventional trial taking place in a UK emergency department. Trials. 2026 Feb 06. doi: 10.1186/s13063-025-09412-6. PMID: 41645217.

Treweek S et al. Strategies to improve recruitment to randomised trials. Cochrane Database of Syst Rev. 2018;2(2):MR000013. doi: 10.1002/14651858.MR000013.pub6.

Gillies K et al. Systematic review of the use of Study Within A Trial (SWAT) for recruitment and retention. Trials. 2022;23(1):139. doi: 10.1186/s13063-022-06052-y.