Unrestrained Plethysmography Analysis Module

The Unrestrained Plethysmography (URP) Analysis Module analyzes signals obtained from “free roaming" chambers.  Adjustable “Attribute Settings” such as Minimum Flow, Baseline Shift and Volume Match are available to ensure proper cycle detection.  Automated validation marks for Start Inspiration, Start Expiration and Percent Relaxation can be displayed. 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-URP100W

Name		Definition
Num		The number of the cycle.
PIF		The Peak Inspiratory Flow is the highest value measured from the baseline.  The baseline is formed by connecting the start inspiration mark and the start expiration mark.
PEF		The Peak Expiratory Flow is the lowest value measured from the baseline.
TV		Tidal Volume is the integral of the difference between the inspiration signal and the baseline expressed in flow units-seconds. The baseline is formed by connecting the start inspiration mark and the start expiration mark.
MV		Minute Volume is the product of TV and BPM. When running in a multiple epoch logging rate or second logging rate, the averaged value will be calculated off of the averaged TV and averaged BPM values.
BPM		Breaths Per Minute is the reciprocal of the period, in seconds, associated with a breath, multiplied by 60.
IT		Inspiration Time is the time, in milliseconds, from the start of inspiration to the end of inspiration. The start of inspiration is marked at the point where the respiration signal crosses the baseline with a positive slope. The end of inspiration signal is marked at the point where the respiration signal crosses the baseline with a negative slope.
ET		Expiration Time is the time, in milliseconds, from the end of inspiration to the end of expiration.
TT		Total Time is the sum of inspiration and expiration times: IT + ET.
AT		Apnea Time in not currently used.
Pause		Pause provides a timing comparison of early and late expiration.
PEnh		Enhanced Pause is the product of the ration of PEF to PIF and Pause.
TVadj		The adjusted Tidal Volume is calculated by multiplying the reported TV by an adjustment factor as specified in Adv Attrib2.
MVadj		The Minute Volume adj is the product of TVadj and BPM.
IF50		Inspiratory Flow at 50% Tidal Volume.
EF50		Expiratory Flow at 50% Tidal Volume.
E/IF_50		The ratio of Expiratory Flow to Inspiratory Flow at 50% Tidal Volume.