Minimal Hepatic Encephalopathy in Cirrhotic Patients: A New Simple and Fast Digital Screening Method

Backround: Minimal hepatic encephalopathy is a common and prognostically severe complication of cirrhosis with a significant impact on the quality of life. Detailed diagnostic work-up of minimal hepatic encephalopathy is time-consuming and difficult to integrate into daily clinical routine. Objective: We aimed to develop a new, simple, and easy-applicable smartphone-based self-assessment method for screening of minimal hepatic encephalopathy. Methods: 92 patients with cirrhosis and 20 healthy controls were recruited to perform 3 different short digital tests on smartphones (Tip test (TT), number connection test (dNCT) and modified Stroop test (ST)). Results were correlated with the Psychometric Hepatic Encephalopathy Score (PHES) as the presumed gold standard for minimal hepatic encephalopathy. The impact of age, gender, education, CHILD and MELD scores was further investigated. Results: All 3 digital tests showed good correlation with PHES (TT r = −0.76, dNCT r = −0.58, and ST r = −0.65; all p < 0.001). Digital tests were performed significantly faster (TT median 41s (IQR 36–51s); dNCT median 21s (IQR 8–16s); ST median 76s (IQR 55–99s) than PHES (median 322s; IQR 261–434s); There were significant differences between age groups and different levels of education (p < 0.05). AUC for TT was 0.835 (95% confidence interval 0.747–0.922, p < 0.001) and highest among all digital tests. Conclusion: All 3 digital tests proved to be suitable for screening of minimal hepatic encephalopathy. TT showed the highest correlation with reference PHES and was not affected by language skills or color blindness, and, thus, might represent a new and fast method for minimal hepatic encephalopathy detection. Intra-individually adjusted smartphone-based thresholds might further eliminate the influence of age, gender, educational level or training, to refine early app-based alerts in case of cognitive deterioration in cirrhotic patients.