YH-600B Pro User Manual V3.0
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6. Glossary
Because of the respiratory tract’s airway
limitation, sound is made when respiratory
airflow gets through the narrow respiratory
tract, which usually indicates that the patient is
likely to have suffered in years from sleep
apnea syndrome along with the increase of
age.
The performance of respiratory intermission
during sleep is that the respiratory airflow
drops to lower than 10% of the normal range
and lasts for at least 10 seconds. The
recurrent intermission during sleep is easy to
cause severe oxygen-deficit to brain and
blood, form hypoxemia and induce
hypertension, brain-heart disease, arrhythmia,
myocardial infarction and angina, which then
can induce multi-system diseases of the
human body.
The reduction range of respiratory airflow is
more than 50% of the normal, accompanied
with more than 4% of oxyhemoglobin
saturation reduction.
The SAHS means at least 30 times of apnea in
7 hours of nightly sleep time of adults and
each apnea lasts for more than 10 seconds. Or
the apnea hypopnea index AHI (the number of
apneas and hypopneas per hour) is greater
than 5.
The OSAHS means the sleep apnea hypopnea
syndrome caused by obstruction of the upper
respiratory tract (including the collapse of
pharyngeal mucosa).
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