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Nexam Pro User Manual
Chapter 6
Time to Qmax
The time to Qmax is the elapsed time from the onset of the flow to the Qmax.
Calculated: Time to Qmax = [C]
Pdet at Qmax
The detrusor pressure at the Qmax.
Voided volume
The voided volume is the total volume expelled via the urethra.
Calculated: Voided volume = [E1 + E2 + E3 + E4]
Flow time
The flow time is the time over which measurable flow actually occurs.
Calculated: Flow time = [B1 + B2 + B3 + B4]
Voiding time
The voiding time is the total duration of micturition, including the miction
interruptions. When voiding is completed without interruptions, voiding time is
equal to flow time.
Calculated: Voiding time = [D]
Average flow
The average flow is the total voided volume divided by the flow time. The
average flow rate is only meaningful if flow is continuous and without terminal
dribbling. It is calculated as voided volume divided by the flow time.
[E1 + E2 + E3 + E4]
Voided volume (ml)
Calculated: Average flow rate = -------------------------- = --------------------
[B1 + B2 + B3 + B4]
Flow time (s)
When flow markers are present the average flow rate is calculated between
the first and last flow marker.
Micturition resistance
The micturition resistance is computed as the vesical pressure (P
ves
) at peak
flow divided by the square of the peak flow. If there exists more than one peak
with the same flow the greatest vesical pressure belonging to that flow, is used
in the calculation. This will give the maximum micturition resistance.
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