A Novel Tool to Facilitate Communication of Pain Quality: "Pain Blocks".

Purpose: Assessment of pain is difficult for many reasons, including the inability of patients to translate a subjective experience into words, and it is challenging for health care providers to create a shared understanding of what is being described. Physical representations exist to facilitate the objective scaling of "severity" or "intensity" of pain, but none exist to enable communication of pain quality. The objective of this proof-of-concept study was to develop, introduce, and evaluate consistency of participant interpretation of a novel kinesthetic tool set (Pain Blocks) that was designed to represent qualities of pain.

Methods: A prospective convenience sampling of participants approached in nonmedical settings over 9 months was queried to assess 6 randomly ordered Pain Blocks during structured interviews. The subjects were directed to associate each Pain Block with a pain quality from a list of 12 suggestions or use a free-text area for "other" descriptors. During the study, Pain Blocks were removed and replaced based on consistency of response at interval assessments. In part 2, participants were asked if any of the Pain Blocks accurately characterized the quality of their last severe pain.

Findings: A convenience sample of 220 participants was enrolled in the study and assessed 6 Pain Blocks. They interpreted and applied a pain quality to each of the blocks. Using interval assessments, a final selection of 6 Pain Blocks was derived that had consistent high association with specific pain qualities, either individually or with synonyms: Block 1 (stretching and tearing), 81.8%; Block 3 (crampy and throbbing), 90.4%; Block 4 (sharp and stabbing), 99.1%; Block 6 (crushing and dull), 94.1%; Block 7 (twisting), 95.8%; and Block 8b (burning), 100%. There were no differences in consistency of block interpretation between sexes or in terms of past experience of pain.

Implications: We were able to create a group of physical objects (Pain Blocks) that were consistently and persistently interpreted, with a high degree of reliability, to represent specific pain qualities across ages and sexes. Although this proof-of-concept article was limited by the inclusion of English-speaking patients only and voluntary participants not currently in pain, the results support further investigation into tools to create a shared understanding of pain sensations between provider and participant.