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software module, blood pressure module, ecg software, blood pressure analysis

Blood Pressure Analysis Module

The Blood Pressure (BP) Analysis Module computes physiologic parameters from digitized pressure data.  The graph above represents a typical aortic pressure recording as it would appear on the monitor.  Automated validation marks for Diastolic, End Diastolic, Systolic and a user defined % Recovery Point are shown.  The validation marks provide visual, on-line 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-BP100W
Name   Definition
Num                        
             

The number of the cardiac cycle.
Sys, Dia, Mean  

Systolic, Diastolic, and Mean pressure.
PH, HR, TTPK, ET


 
Common parameters include Pulse height, Heart rate, Time to peak, Ejection time.
+dP/dt, -dP/dt  
 

Maximum positive and negative value of the first derivative of the pressure.
%REC
             
The amount of time it takes the pressure to recover.
NPMN  

Non-pulsatile mean pressure.
Q-A


 
The Q-A Interval is the time in milliseconds from the start of the Q-wave, in the ECG trigger channel, to the start of the systolic pressure rise.
Mean2  
 

An alternate representation for Mean calculated as (Systolic + 2 * Diastolic)/3.
PTT


             
Pulse Transit Time (PTT) is the time between the prior systolic time of the upstream channel and the systolic time of the selected channel. This time is reported in ms.
PWV  



Pulse Wave Velocity (PWV) is the velocity calculated by using the Pulse Wave Distance (PWD) and Pulse Transit Time (PTT). PWV is calculated as: Pulse Wave Velocity = Pulse Wave Distance / Pulse Transit Time.
IBIs, IBIms, IBIed  



Inter-Beat Interval (IBI) is the time in milleseconds between cardiac cycles and allows Heart Rate Variable (HRV) to be calculated from Blood Pressure signals (Frequency Domain).
Count  

Reports the number of cycles in a given logging period.