Respiratory Mechanics Frequently Asked Questions

Q. What maneuvers are included in the RM software upgrade for the Puritan BennettTM 840TM ventilator system that are different than what's available for the Puritan Bennett 700 SeriesTM ventilator?

A. Negative Inspiratory force (NIF), occlusion pressure (P0.1) and vital capacity (VC).

Q. ln what breathing modes can the Respiratory Mechanics

maneuvers be accessed?

A. The maneuvers can be accessed in all modes except: Apnea ventilation Safety pressure control ventilation (PCV) Occlusion status cycling (OSC) Noninvasive ventilation (NIV) When the circuit type is Neonatal When another maneuver has already been accessed

Q. Which performance indicators are automatically calculated and displayed by the RM software upgrade for the Puritan Bennett 840TM ventilator system?

A. Dynamic compliance (CDYN), dynamic resistance (RDYN), end

expiratory flow (EEF), peak spontaneous flow (PSF) and peak

expiratory flow (PEF).

Q. Are there any alarm conditions that would cause the RM maneuvers of the Puritan Bennett 840TM ventilator system to be cancelled automatically?

A. Yes, they are:

PPEAK alarm PVENT alarm VTI SPONT VTI MAND VTI

Respiratory Mechanics Frequently Asked Questions

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Q. What is the NIF maneuver (also known as maximum inspiratory force - MlF)?

A. This is a maneuver that occurs while both the inspiratory valve and the expiratory valve are held closed by the practitioner while the patient is coached to take a maximal inspiratory breath. The pressure generated by the patient is recorded and displayed by the RM software in both graphical and numerical formats.

Q. What is the occlusion pressure maneuver (also known as P100, P0.1 or P-oh-one)?

A. This is the pressure generated by the patients diaphragm during the first 100 milliseconds (ms) of inspiration. It is an estimation of neuromuscular drive to breathe. The pressure generated by the patient is recorded and displayed both graphically and numerically.

Q. How are the respiratory mechanics maneuvers accessed?

A. They can be found by selecting the OTHER SCREENS button on the lower portion of the GUI. You can tell if RM is installed on your Puritan Bennett 840 ventilator because the letters RM will appear on this button.

Q. What is the vital capacity (VC) maneuver?

A. This is a coached maneuver where the patient is coached to draw in a maximal inspiration, then fully exhale. It is a measurement of how much volume the patient can exhale when prompted. The exhaled VC is recorded and displayed both graphically and numerically.

Q. What is peak expiratory flow (PEF) rate?

A. PEF is the maximum flow rate observed during exhalation, excluding the first 100 ms of data. PEF can be used as an indicator of obstructed airways.

Q. What is dynamic compliance (CDYN)? What is dynamic resistance (RDYN)?

A. The RM software for the Puritan Bennett 840 ventilator measures the compliance and resistance of the patients lungs and chest wall. The measurements of CDYN and RDYN indicate the impedance characteristics of the lungs, chest wall and conducting airways. Changes in either of these values may reveal changes in the elastic properties of the lung and/or chest wall, or in the ability of the conducting airways to accommodate a particular flow of gas.

Q. What is end expiratory flow (EEF) rate?

A. EEF is the rate of expiratory flow that occurs at the end of exhalation and can be used to determine whether expiratory time is adequate to prevent gas trapping and intrinsic PEEP.

Q. What is peak spontaneous flow (PSF) rate?

A. PSF is the maximum inspiratory flow rate sampled during a spontaneous inspiration. It is a good predictor of impending air hunger and helps the clinician set peak flow rate or choose an optimum level of pressure support.

Specifications subject to change without notice.

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