Figure 1
From: Intra-abdominal Pressures during Voluntary and Reflex Cough
A. An urodynamic (UD) tracing (on a compressed timeline) of a subject demonstrating voluntary cough and an episode of RCT coughs (i.e., LCR) triggered by the RCT. A pressure sensor catheter was inserted into the subject's bladder and rectum, and the bladder was filled to 200 ml using sterile saline. Intravesicular bladder pressure was recorded at 30 samples per second. Subject was asked to voluntarily cough and the RCT was performed. Each cough episode was traced and the coordinates corresponding to a particular bladder pressure measurement (Pves) and the IAP at that time (Tsec) were recorded for each peak, valley and slope change of the pressure tracing. B. A record was made of the complete cough episode timeline. As a part of this process, maximal IAP for each cough event was determined. Interpolation was used to fill in the remaining Pves between each annotated point. The average Pves was then calculated for each second of the timeline, and plotted as a pressure versus time graph of the cough episode.