Ventilation

Question 1

Criteria for nocturnal NIPPV

Answer 1

1. PACO2 =>45mmHg
2. Nocturnal oximetry =<88% for 5 consecutive minutes
3. Maximal inspiratory pressure <60cmH20
4. FVC <50% predicted
5. Sniff nasal pressure <40 cmH20

Question 2

Diagnosis of OHA

Answer 2

BMI =>30

pCO2 =>45mmHg

Question 3

Diagnosis of OSA

Answer 3

1. Symptoms of nocturnal breathing disturbances or daytime sleepiness or fatigue
2. 5 or more episodes of obstructive apnea-hypopnea per hours

OR if not symptoms
AHI >15/hr

Question 4

Most common complaint OSA

Answer 4

Snoring

Question 5

Most common daytime symtpom

Answer 5

Excessive sleepiness

Question 6

Gold standard test OSA

Answer 6

Overnight polysomnogram

Question 7

Cessation of airflow >10 seconds

Answer 7

Apnea

Question 8

=>30% reduction in airflow for at least 10 seconds during sleep accompanied by =>3% desat or arousal

Answer 8

Hypopnea

Question 9

Causes by increased sensitivity to pCO2

Answer 9

Central sleep apnea