U.S. Range PS-4-20 Specifikace stáhnout pdf (Strana 31)

Patient comfort through synchrony

Advanced, predictive technology maximizes comfort

and synchrony over a wide range of breath rates

The ASV algorithm continuously learns the patient’s own

respiratory rate through high-resolution breath phase

mapping, maintaining accuracy even at lower breath rates.

The algorithm maintains synchrony with the patient’s

respiratory pattern by learning the rate at which the patient

progresses through each breath and dynamically predicting

inspiratory and expiratory durations. This enables the VPAP

Adapt to deliver pressure that reaches its therapy peak at

end-inspiration and its nadir by end-expiration, continuously

and smoothly. Additionally, the ResMed leak management

feature ensures greater synchrony by offsetting variations

and inconsistency due to leak.

Easy-Breathe for the most natural breathing comfort

Unique to ResMed, the patented Easy-Breathe waveform

delivers a smoother, more comfortable breathing experience

by replicating the natural wave shape of normal breathing.

Flow-limited breath

Time

Peak ﬂow

Flow

MV = Vt x RR

Normal breath

Time

MV = Vt x RR

Peak ﬂow

Flow

Tidal volume

Time

Peak ﬂow

Flow

Flow measured with

split-second resolution

Pressure Support response based on minute ventilation

To successfully treat central and mixed apneas, minute

ventilation should be stabilized. This is best achieved by

constant monitoring of the patient’s breathing pattern,

minute ventilation and nimble adjustment of Pressure

Support to break the cycle of hyperventilation and central

apneas that occur during CSA.

The algorithm achieves this by detecting such apneic events

and quickly changing the Pressure Support to control events

and normalize tidal volume, thereby normalizing breathing.

Other ASV devices estimate the tidal volume based solely

on the peak ﬂow. This can work if every breath is shaped

the same, but many breaths have a different ﬂow proﬁle.

As seen in the ﬁgures below, ventilation can change

substantially without any change to the peak ﬂow of each

breath. For this reason, measuring minute ventilation

directly enables the most timely and effective pressure

changes and, therefore, the best therapy.

Ease of titration

Market-leading simplicity

Minimal settings with empirically selected default parameters

are designed to cover the broadest range of patient setups.

Unlike competing devices that require setting extra parameters

such as Rise Time, ResMed’s ASV reduces the need for

complicated customization during titration.

Late mid-inspiration

Time

Early end-inspiration

–

Tracking changes in patient’s respiratory rate and airﬂow

Flow

Pressure

Flow

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