Retrospective evaluation of operator bias in the performance of high‐resolution anorectal manometry

Measurements obtained during high‐resolution anorectal manometry (HRM) are subject to operator–patient interactions. For example, standardized enhanced instruction delivered by a single operator in a test–retest fashion did not consistently increase pressures generated during dynamic maneuvers. It is probable that factors other than verbal instruction effect communication during the procedure. To investigate this hypothesis, we retrospectively examined inter‐operator variance in HRM results.