Compliance (C) and

Resistance (R)

Computations

Chapter 13

Options and Accessories

Parameter

Description

 

 

Peak lung flow

The maximum measured inspiratory flow at the patient wye. Available in

(Peak L-Flow)

VCV and PCV.

 

Peak L-Flow is displayed in LPM.

 

 

Dynamic

An estimation of the compliance and resistance of the patient’s lungs, using

compliance and

the Least Square Estimation algorithm on the equation of motion (P = R • Q

resistance

+ V /C, where Q = lung flow and V = lung volume), performed during each

 

machine or operator initiated inspiration.

 

Dynamic compliance is displayed in mL/cmH2O. Dynamic resistance is

 

displayed in cmH2O/L/s. All compliance and resistance values are estimated

 

on time or operator triggered mandatory breaths only. If there were no

 

machine or operator initiated breaths within the last one minute, - - - - is

 

displayed.

 

These alarms interrupt dynamic compliance and resistance updates: Corrupt

 

Compliance, Corrupt Altitude, High Pressure, Low Insp pressure, Air Source

 

Fault, O2 Valve stuck closed, Exh Valve stuck open, Low Tidal volume, Low

 

PEEP.

 

Dynamic compliance values from 0 to 350 mL/cmH2O and dynamic

 

resistance values from 0 to 400 cmH2O/L/s are displayed: (If either value is

 

above its limit, only + + + is displayed. If either value is below its limit, only

 

- - - is displayed.)

 

 

Table 13-9: Respiratory Mechanics Maneuver Summary and Data Specifications

Dynamic C and R are estimated during ventilator and operator initiated breaths. Static C and R are estimated during a Static C and R maneuver.

Dynamic Compliance

Dynamic compliance is calculated using these equations:

 

 

 

 

n

 

 

2

n

∗

n

 

 

 

 

 

 

 

 

 

 

∑ QiVi

 

 

 

– ∑ Qi2

 

∑ Vi2

CL =

 

 

 

i = 0

 

 

 

i = 0

 

i = 0

--n---------

-----------------n------

--

----------------n----------

--------------n---

∑QiVi∗ ∑ PiQi – ∑ PiVi∗ ∑ Vi

i = 0

i = 0

i = 0

i = 0

REF 1057983 A

Respironics V200 Ventilator Operator’s Manual

13-65

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Philips V200 manual Compliance C Resistance R Computations, Dynamic Compliance, 13-65
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