Abstract

Objective
The intrarectal pressure can make error during urodynamic study and can decrease the accuracy of detrusor pressures. The purpose of this study was to investigate the incidence and cause of the error in measurement of recral pressure. Method: Forty-eight patients with spinal cord injury were enrolled. With the patients in the lithotomy position, catheter was placed into the bladder and the rectum, then urodynamic testing began by infusion of normal saline (20∼30^oC) via urethral catheter. The errors by measurement of rectal pressure during urodynamic study were recorded. According to the position of patients and spasticity of hipflexors, difference of rectal pressure was investigated. Results: The error rate of intrarectal pressure during urodynamic study was 41%. Intrarectal pressure was higher in lithotomy position than in lateral lying position. According to modified Ashworth scale of hip flexors, intrarectal pressure in grade 0 was significantly lower than grade 1, 1.5 and 2 (p＜0.05). Conclusion: There was significant errors in measuring of the intravesical pressure during urodynamic study. These factors might be posture, spasticity of hip flexors, and expelling of the catheter in urodynamic study. (J Korean Acad Rehab Med 2006; 30: 571-574)

• Keywords: Urodynamic study, Intrarectal pressure, Intravesical pressure, Measurement errors