Autonomic nervous activity of patients with gagging problems during dental mirror insertion.

Objective: To investigate autonomic nervous activities in patients with gagging problem.

Methods: Subjects were 12 and 12 individuals, graded as Group G2 (mild gagging problem) and Group G3 (middle gagging problem), respectively, according to the Classification of Gagging Problem index (CGP) and compared with 15 normal patients. Heart rate (HR), low-frequency/high-frequency ratio (L/H), the coefficient of component variation for high frequency (CCVHF), and the coefficient of variation of R-R intervals (CVRR) were assessed by heart rate variability on electrocardiogram.