Obstructive apnea

Question 1

Paradoxical breathing

Answer 1

Abdomen and chest out of phase

Question 2

Criteria

Answer 2

Does not include drop in SaO2 or change in SaO2 as with hypopneas or OSA disorder

Question 3

PSG findings

Answer 3

apneic episodes occur in the presence of resp muscle effort

apneic episodes lasting 10 secs or longer are clinically significant

apneic episodes most prevalent during REM sleep

Question 4

RIP (resp inductance plethysmography)

Answer 4

Diagnostic technique used in PSG that serves as a surrogate of resp effort and can help detect airflow limitation

Question 5

Scoring of apneas

Answer 5

drop in peak signal excursion by >=90% of pre-event baseline using an oronasal thermal sensor (diagnostic study), PAP device flow (titration study) or an alternative apnea sensor for >=10 secs