PIPRA — Pre-Interventional Preventive Risk Assessment

What this tool is and how to interpret its evidence

PIPRA is an international preoperative model for estimating the probability of postoperative delirium. It combines routinely available patient and procedural information before surgery and was evaluated in versions with and without C-reactive protein. The intended population excluded cardiac and intracranial procedures, so the model should not be assumed valid for those groups. It returns an individual risk estimate to support prevention planning; it does not detect current delirium or establish that postoperative delirium will occur. The source publication should be used for the current calculator, variable definitions and applicable regulatory information.

Dodsworth and colleagues pooled individual data for 2,250 participants to develop the model and evaluated it in a separate cohort of 359. Internal validation produced areas under the curve of 0.80 with C-reactive protein and 0.79 without it; external discrimination was 0.74. Calibration and clinical usefulness depend on how closely a local surgical population resembles the study data and what action follows the estimate.

The publication reports that several authors were inventors, shareholders, directors, employees or consultants connected with PIPRA AG. That does not invalidate the research, but it is material context and should be displayed. Product and certification statements can change and should be checked against current official information rather than repeated as permanent facts. PIPRA belongs in perioperative prediction context, outside the current-delirium tool count. A high estimate warrants prevention and appropriate assessment, not a delirium diagnosis.