Coronary Blood Flow Analysis Module

The Coronary Blood Flow (CBF) Analysis Module computes physiologic parameters from blood flow data. The analysis functions by applying a series of logical tests to the digitized flow signal, as well as pressure related events which occur in the left ventricular pressure signal. The pressure related events critical to the blood flow analysis are Left Ventricular End Diastolic Pressure and dP/dt_min. In order to measure coronary flow, a valid left ventricular pressure channel must be present.  The graph above represents a typical coronary blood flow recording, its related left ventricular blood pressure and its first derivative (dP/dt) as they would appear on the monitor.  Automated validation marks for End Diastolic Point and End Systolic Point are shown.  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-CBF100W

Name		Definition
Num		The number of the cardiac cycle.
Mean		The integrated level of the flow for the cardiac cycle.
FMax		Maximum Flow that occurred for a cardiac cycle.
FMin		Minimum Flow that occurred for a cardiac cycle.
CO		Cardiac Output.
SV		Stroke Volume.
+dQ		+dQ is the maximum positive value of the first derivative of the flow that occurs during the cardiac cycle.
SFIw		Flow during systolic part of cardiac cycle.
DFlw		Flow during diastolic part of cardiac cycle.
SVol		Volume during the systolic part of the cardiac cycle.
DVol		Volume during the diastolic part of the cardiac cycle.
-Flow		Any negative flow that occurred during the cardiac cycle.
TVol		Total Volume is the sume of Systolic Volume and Diastolic Volume: SVol + DVol.
NPMN		The non-pulsatile mean calculated over the complete logging interval.