Measurement tools for chronic pruritus: assessment of the symptom and the associated burden: a review

Chronic pruritus is a subjective, multidimensional and highly impairing symptom of difficult assessment. Its clinical features and secondary burdens may vary substantially between affected individuals and within the same patient across time. Standardized scales and questionnaires have been developed to assess the various dimensions of chronic pruritus. Instruments addressing the intensity, distribution, qualities of associated symptoms, skin status and course over time are available for clinical trials. In addition, patient-oriented questionnaires on reactive conditions, including sleep disorders, anxiety, depression, and impairment of quality of life can be used. Assessing the individual patient’s needs before and throughout the treatment is valuable in directing therapeutic priorities and maximizing patient’s satisfaction. Along with a detailed medical history and a comprehensive physical examination, these instruments should be implemented in the clinical routine to achieve a comprehensive assessment of each patient. European experts of the European Academy of Dermatology and Venereology (EADV) considered a priority the use of intensity scales and questionnaires on quality of life. Harmonization of the assessment procedures should be aimed for across attending physicians. New technologies including electronic diaries or the use of tablet computers to complete assessment tools constitute helpful aids in the clinical practice by facilitating data collection and saving time.