Evaluating driving abilities of patients under opioid treatment for chronic pain, by using the Vienna Test System and a newly released APP for smartphones (APP SafeDrive). The old and the new.

Objective: The study compare two tests for evaluating the driving abilities of patients undergoing opioid therapy for chronic pain: the Vienna Test System (VTS), a software developed for this purpose, and a new free APP for smartphones (SafeDrive) measuring visual and auditory reaction times.

Methods: One hundred and five patients undergoing long term opioid therapy for chronic pain were enrolled. The driving abilities of study patients were evaluated using two tests, namely the Vienna test System (VTS) and the SafeDrive APP. The concordance between the two tests was evaluated through Cohen's test. In addition we evaluated the correlation between the results of both VTS and SafeDrive tests and prescribed Morphine Equivalent Doses (MEDs), sex, age and the specific drugs taken, by multivariate linear regression analysis.

Results: A statistically significant concordance (Cohen's K coefficient=0.476) was found between the SafeDrive APP and the VTS; multivariate linear regression analysis found no significant influences of dosage and type of opioid prescribed on test performances, but significant influences of sex and age.

Conclusions: The Authors found a significant correlation between VTS with SafeDrive test results. The SafeDrive APP is cheaper, easier to use and faster than VTS, and is portable and "usable on the road". Complex behavioral tasks such as driving may be severely impaired by psychoactive drugs, and consequently SafeDrive could be considered a useful portable screening tool to identify drivers with drug associated psychomotor impairment.