Pulsatile Tissue and Gut Motility Analysis Module

The purpose of the Pulsatile Tissue & Gut Motility (PT) Analysis Module is to compute physiologic parameters from pulsatile data. The analysis functions by applying a series of logical tests to the digitized signal and its first derivative using criteria selected by the user. The graph above represents a typical force (tension) recording as it would appear on the monitor. Automated validation marks for Maximum Mark and Minimum Mark are shown along with Percent Recovery Marks 1 and 2 and Start Contraction Mark. The validation marks provide visual, real-time verification of the accuracy of the system.

The list below describes the parameters calculated by the analysis module either in real-time or during subsequent analysis.

Model PNM-PT100W

Name		Definition
Num		The number of the tissue contraction cycle.
Max		The Maximum value that occurs during the contraction cycle.
Min		The Minimum value that occurs during the contraction cycle.
Avg		Avg is the area under the curve for a valid cycle divided by the number of logging points under the curve.
Delta		The Delta is the difference between the maximum and minimum values of a cycle.
Rate		Rate is the reciprocal of the time interval for the cycle multiplied by 60.
TTPK		Time To Peak is the time from the start of the rise of the contraction to the maximum contraction value. The value is reported in milliseconds.
+d_/dt		The maximum positive value of the first derivative of the contraction that occurs between the Start Contraction Mark and the completion of Peak Validation Time.
-d_/dt		The maximum negative value of the first derivative of the contraction that occurs between the Maximum Mark and the point that clears the minimum pulse height.
%Rec1		Percent Recovery 1 is the period of time after the maximum contraction has occurred until a pre-defined percentage of the delta has occurred. The time is in milliseconds.
%Rec2		Percent Recovery 2 is the period of time after the maximum contraction has occurred until a pre-defined percentage of the delta has occurred. The time is in milliseconds.
+dd/dt		The maximum positive value of the second derivative of the contraction that occurs between the Start Contraction point and the peak validation time.
-dd/dt		The maximum negative value of the second derivative of the contraction that occurs between the maximum point and the point that clears the minimum pulse height.
MI		The Motility Index is the product of DELTA multiplied by RATE for a given logging period. Note: When running in a logging mode other than 1 epoch, MI is calculated from the averaged Delta and averaged Rate values.
Area		Area is the area under the curve for a valid cycle.