Oridion Capnostream 20p, Руководство оператора

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Oxygen Desaturation Index (ODI)
66 Portable Bedside Capnograph/Pulse Oximeter
A/hr Visual Alert
The A/hr Visual Alert, which appears as an asterisk next to the A/hr value, is used to indicate to the caregiver
that the apnea count in any one hour period during the last 12 hours exceeded a set number. (The default value
which will trigger an A/hr Visual Alert is 10.) The asterisk will appear only when an A/hr Visual Alert is
triggered, and it is updated once every 10 minutes. The Visual Alert on the screen indicates to the caregiver that
the Apnea and O
2
Desat screen should be viewed to learn more about the patient’s breathing patterns. To change
the value which will trigger an A/hr Visual Alert, see Adjustable CO2 Parameters on page 55 .
Oxygen Desaturation Index (ODI)
The Oxygen Desaturation Index (ODI) indicates the “dips” in SpO
2
– that is, the number of times that the SpO
2
value dropped 4% or more from baseline and returned to baseline in 240 seconds or less. (This refers to percent
of oxygen saturation, not percent of the patient’s current SpO
2
rate). The baseline is created when a consistent
and stable (in the range of ± 1 SpO
2
point (%)) SpO
2
value is detected over a 20-second period. This baseline,
updated once a second, will be the rounded maximum SpO
2
over these 20 seconds. If a valid baseline cannot be
established based upon the definition above, then the previous baseline is kept.
On the Home screen, the ODI for the previous hour is shown. A lower ODI (that is, fewer such instances)
indicates more stability of the patient’s oxygen saturation. Since this index is a per-hour count, dashed lines will
appear on the screen until one hour has commenced since the beginning of monitoring.
On the Apnea and O
2
Desat Report screen, ODI is average per hour “dips” in SpO
2
over the selected time period
of 2, 4, 8 and 12 hours.
ODI is currently available for adult patients only and is intended for patients age 22 and older. It is not available
for infants (age 0-1) or for patients under age 22.
Apnea and O2 Desaturation Report
The on-screen and printed Apnea and Desat reports show a comprehensive picture of the number of A/hr and
ODI events over a set time period of 2, 4, 8, or 12 hours. These reports provide both details regarding the A/hr
and ODI status of the patient and a general picture which can help the caregiver spot patient trends in these
areas. For more information on this report, see
Apnea and O2 Desaturation Report on page 93.
Monitoring with A/hr and ODI
When monitoring patients with A/hr and ODI, please take the following issues into consideration:
CAUTION: Please note that A/hr and ODI do not report hypopnea events.
CAUTION: Apnea per Hour (A/hr) and Oxygen Desaturation Index (ODI) do not represent and should
not be interpreted as an apnea hypopnea index (AHI) as reported by formal
polysomnography studies.
CAUTION: Apnea per Hour (A/hr) and Oxygen Desaturation Index (ODI) do not represent and should
not be used to diagnose sleep disordered breathing.
CAUTION: Alarms and a noisy environment may affect A/hr and ODI values. See the Note regarding
recommendations on changing device settings for a sleeping patient below.
CAUTION: A/hr and ODI are reported by the monitor throughout the monitoring period; however, the
monitor cannot discern if the patient is actually sleeping. Also, if a patient removes a
sensor, the monitor may indicate apneas when no such apneas took place.
CAUTION: The administration of opioid analgesia and sedatives may cause respiratory depression,
which will result in transient apnea and O
2
desaturation events that will be reflected in A/hr
and ODI values.
CAUTION: Please read all user information to ensure complete understanding of A/hr.
CAUTION: ODI values may be affected by the algorithms employed by the pulse oximetry module.