Problem: The definition of an obstructive apnea as an abnormal respiratory event in sleep is
a) a complete cessation of the airflow for at least 30 seconds followed by at least 3% decrease in oxygen saturation
b) a complete cessation of the airflow for at least 10 seconds in the presence of continued respiratory effort; oxygen desaturation is not required
c) a complete cessation of the airflow for at least 10 seconds accompanied by a cessation of the respiratory effort for at least 5 seconds
d) a decrease of the airflow by at least 30% for at least 10 seconds followed by at least 3% decrease in oxygen saturation