Clinical Evaluations: turning clinical data into a convincing narrative

In clinical evaluations under the EU MDR, the story you tell with the available data will often matter as much as the data itself. Turning clinical data into a convincing benefit-risk narrative is therefore the ultimate exercise in storytelling.

The story must be written with its target audience in mind: the Notified Body’s reviewers. These readers are asking themselves from page one:

1. What problem does this device really solve?

2. For whom is it intended, in which setting, and compared to what?

3. What can go wrong, how often, and how well is it managed?

4. Do the device benefits outweigh the associated risks?

If your CER does not answer these questions in a logical, readable manner, reviewers will aim to get those answers anyway, and that is exactly how extra rounds of questions arise. A strong narrative will lead the reviewers to think as you did during device development.

Every good story develops by following a basic outline.

You can think of it in five parts.

• • • Clearly define the clinical condition, its impact on patients and healthcare systems, and current treatment gaps.
    • Make it obvious why improving this situation matters.

• Define device intended patient population and intended use.
• Clarify where and how the device is used and by whom.
• Clearly state the benefit of using the device, within the clinical background context.

• Present key clinical data as a progression: from pre-clinical to first‑in‑human or pilot data, through pivotal studies, to real‑world PMS and PMCF.
• Show how the quality and quantity of evidence evolve and uncertainty decreases.

• List and quantify relevant risks and undesirable side effects, anchored in complaints, vigilance, and literature.
• Acknowledge limitations and residual risks honestly to ensure credibility.
  

• Explicitly weigh benefits against the frequency and severity of risks, in the specific clinical context described at the beginning.
• Close the loop by tying back to the unmet need and showing how the device changes the story for patients. 
  
  

This structure transforms a set of disconnected results into a coherent argument a reviewer can follow and agree (or disagree).

It is an art to tell the best possible story with the available evidence without overpromising the device’s capabilities.

Here is how to do that:

• Make patient journey visible.
  Instead of listing endpoints only, briefly describe how the device changes the experience for a typical patient, such as faster diagnosis, fewer reinterventions, less pain, shorter stay. Then support each part of this journey with specific data.
• Use contrasts, not just numbers.
  A complication rate of 3% is just a number until you contrast it with the baseline or alternative options: “3% vs 8 - 10% in the published literature for standard care” is a story.
• Show how uncertainty shrinks.
  If early studies were small or had wide confidence intervals, say so and then demonstrate how later PMS or PMCF data narrowed those uncertainties. This shows responsible learning over time, not a weakness.
• Connect each risk to a mitigation and a decision.
  Do not just list adverse events. For each relevant risk, show what was observed, how it is mitigated, and why the residual level is acceptable for the claimed benefit.
• Acknowledge limitations before the Notified Body does so.
  If comparative data are indirect, if literature is heterogeneous, or if some subgroups are underrepresented, explain the impact on your confidence and how you plan to monitor or improve evidence. Transparency strengthens the narrative.

Writing with those points in mind, the readers will not feel that you are “selling” the device. Rather, they will feel guided through your thinking by a balanced, well‑reasoned assessment and will see a good clinical evaluation.

Qserve can help you to tell the best story about your devices. Please reach out to us for any further information!