DWT — Delirium Writing Test

What this tool is and how to interpret its evidence

The Delirium Writing Test was proposed as an experimental indicator of postoperative delirium based on change in handwriting. The study compared writing before surgery with a sample obtained on postoperative day three and considered reluctance to write together with broad motor, spatial, syntactic and spelling disturbance. It did not publish a fixed item set, numeric score, reproducible threshold or standard administration time. Interpretation also requires a usable baseline sample and the physical ability, vision, language and education needed for writing.

Aakerlund and Rosenberg conducted an open study of 24 consecutive patients undergoing thoracotomy for pulmonary malignancy. Five developed DSM-III-R delirium. All five showed severe postoperative writing impairment and none of the 19 patients without delirium showed the reported pattern. Although superficially equivalent to perfect sensitivity and specificity, those fractions come from only five cases in a selected cohort and from an assessment that was not operationalised as a stable test. No independent validation was identified.

DWT is historically interesting evidence that delirium can disrupt complex learned motor and language performance, but it should move out of the current bedside core. The page should report the tiny exploratory design and lack of a standard scoring system rather than display 100% accuracy as a mature estimate. It can link to the primary publication and the related abnormal-signature candidate. A handwriting change may support concern, but cannot establish delirium or distinguish it from neurological, motor, visual or medication effects.