Lecture 5

Question 1

What is the apnoea-hypopnea index how is it used to diagnose sleep related breathing disorders

Answer 1

An way of measuring the severity of apnoeas and hypopnea

Can be used by practitioners to assess parties and aid diagnosis/treatment plans

AHI = (No A+H)/ No sleep hours

<5 per hour is normal 5-15/hour is mild OSA and not usually treated

> 15 hour sugges clinical significance and generally leads to diagnosis and treatment

Another way of conceptualising = every 4 mins there is at least 10 seconds of reduced air flow

An OSA = effort to breathe but no airflow due to an obstruction in the windpipe lasts ~ 10 secs

H = ~10 secs but reduced airflow by 30%
4% O desaturation caused by wondrous becoming narrowed not blocked

Question 2

What are sleep related breathing disorders what is the difference between central and obstructive sleep apnoea?

Answer 2

Sleep disorders