How are the parameters from the Blood Pressure module calculated?

The formulas used to calculate each parameter available in the Blood Pressure add-on for LabChart can be found in LabChart's help documentation under Blood Pressure > Blood Pressure Parameters. The list of parameters and their calculation methods are below:

Ventricular Parameters

·Max Pressure: The maximum pressure during the cycle.
·Min Pressure: The minimum pressure during the cycle.
·Mean Pressure: The arithmetic mean pressure in the current cycle.
·Max-Min Pressure: The difference between minimum and maximum pressures.
·Heart Rate: Calculated as 60 / (Cycle Duration).
·Max dP/dt: The steepest slope during the upstroke of the pressure curve.
·Min dP/dt: The steepest slope during the downstroke of the pressure curve.
·EDP: Pressure at the end of diastole.
·Systolic Duration: Elapsed time between the start of the cycle (at EDP) and the time of Min dP/dt.
·Diastolic Duration: Elapsed time between the time of Min dP/dt and the end of the cycle.
·Cycle Duration: Elapsed time between two alignment points.
·Tau: The exponential time constant of relaxation.
·Pressure Time Index: Also known as tension–time index. The average ventricular pressure during systole, multiplied by the systolic duration.
·Contractility Index: Max dP/dt divided by the pressure (P) at the time of Max dP/dt.
·IRP Average dP/dt: The slope of a straight line fitted to the pressure over the Isovolumic Relaxation Period used for estimation of tau.

Arterial Parameters

·Systolic Pressure: The maximum pressure during the cycle.
·Diastolic Pressure: The pressure at the start of the cycle.
·Dicrotic Notch Pressure: Pressure at the time of the dicrotic notch (if detected).
·Mean Pressure: The arithmetic mean pressure in the current cycle.
·Pulse Pressure: The difference between diastolic and systolic.
·Ejection Duration: Elapsed time between the start of cycle and the dicrotic notch (if detected).
·Non-Ejection Duration: Elapsed time between the dicrotic notch (if detected) and the end of cycle.
·Cycle Duration: Elapsed time between two alignment points.
·Heart Rate: 60 / (Cycle Duration).
·Time to Peak: Elapsed time between the start of the cycle and time of systolic pressure.
·Mean Diastolic Pressure: The average pressure between the dicrotic notch (if detected) and the end of cycle.