Oximeter Features; Oximax Spd™ Alert Feature; Satseconds™ Alarm Management Feature - Nellcor OXIMAX N-600X Series Service Manual

General Introduction

Oximeter Features

OxiMax SPD™ Alert Feature
The OxiMax SPD™ Alert (SPD) feature detects patterns of desaturation in adults that
are indicative of repetitive reductions in airflow through a patient's upper airway into
the lungs. Relative reductions in a patient's minute ventilation over a period of time
may cause a progressive drop in alveolar partial pressure of oxygen, leading to
arterial desaturation. If these decreases in ventilation are repetitive, they generate
distinct patterns in the saturation trend. Patterns of repetitive desaturation often
develop gradually over time, increasing in severity. Detection of patterns indicates
that a patient might be suffering progressively severe decrements in airflow that
may increase in acuity if left untreated.
Patterns of desaturation are multiple, sequential occurrences of a desaturation
followed by a resaturation. The SPD feature qualifies patterns of desaturation
resulting from such repetitive reductions in airflow based on specific characteristics.
•
The severity of the desaturation event (the depth of the desaturation during the event)
and the extent of the following resaturation
•
The regularity of the desaturation events (how often the pattern repeats)
•
The slope of the desaturation/resaturation trends that form the events
The SPD feature qualifies these patterns of desaturation over a period of six (6)
minutes. Depending on the sensitivity setting for SPD, patterns that persist may
result in an SPD alarm, alerting the caregiver to the condition.
Reference the N-600x Operator's Manual for details.
SatSeconds™ Alarm Management Feature
The oximeter monitors the percentage of hemoglobin binding sites saturated with
oxygen in the blood. With traditional alarm management, upper and lower alarm
limits are set to alarm at specific SpO
alarm limit, the alarm sounds each time it violates the alarm threshold. SatSeconds
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Figure 4. Clinically Significant Desaturation Patterns
levels. When the SpO
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level fluctuates near an
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