is the 2 h recommended maximum driving time appropriate for both healthy older and treated...
Post on 25-Feb-2016
23 Views
Preview:
DESCRIPTION
TRANSCRIPT
Is the 2 h recommended maximum driving time appropriate for both
healthy older and treated obstructive sleep apnoea drivers?
A.J. Filtness, L.A. ReynerESRS 2010 - Occupation and environment
Thursday, 16 September 2010
2
Overview
BackgroundMethod
Driving simulatorResults
Successful completion Safe driving time
Conclusion
3
Background
Obstructive Sleep Apnoea (OSA)Group 1 licence holders (car/ motorcycle) diagnosed with sleep
apnoea must stop driving until the symptoms have been controlled and confirmed by medical opinion.
Driver fatigue recommendationThe UK Department for Transport produces the Highway code. A
list of rules and recommendations for road users.
UK Highway Code
The Highway code - Fitness to drive: rule 91Driving when you are tired greatly increases your risk of collision. To minimise this risk make sure you are fit to drive. Do not begin a journey if you are tired. Get a good night’s
sleep before embarking on a long journey avoid undertaking long journeys between midnight and 6 am, when natural alertness is
at a minimum plan your journey to take sufficient breaks. A minimum break of at least 15 minutes
after every two hours of driving is recommended if you feel at all sleepy, stop in a safe place. Do not stop on the hard shoulder of a
motorway the most effective ways to counter sleepiness are to drink, for example, two cups of
caffeinated coffee and to take a short nap (at least 15 minutes).
4
UK Highway Code
The Highway code - Fitness to drive: rule 91Driving when you are tired greatly increases your risk of collision. To minimise this risk make sure you are fit to drive. Do not begin a journey if you are tired. Get a good night’s
sleep before embarking on a long journey avoid undertaking long journeys between midnight and 6 am, when natural alertness is
at a minimum plan your journey to take sufficient breaks. A minimum break of at least
15 minutes after every two hours of driving is recommended if you feel at all sleepy, stop in a safe place. Do not stop on the hard shoulder of a
motorway the most effective ways to counter sleepiness are to drink, for example, two cups of
caffeinated coffee and to take a short nap (at least 15 minutes).
5
6
Aim
To assess the appropriateness of this recommendation for OSA patients treated with CPAP, compared with healthy controls of a similar age.
Following a normal night’s sleep (OSA with CPAP) Under sleep restriction conditions (5h) (OSA with CPAP) Following normal sleep length, OSA without CPAP
Method – Driving Simulator
38 participants male, age 50 – 75y 19 OSA patients, ave 8.6y CPAP 19 healthy control participantsDual carriageway2 h afternoon drive
7
Repeat measure counterbalanced design Normal nights sleep (8 h) Sleep restriction to (5 h)
Additional study night OSA participants without CPAP (n=11)
8
Measures
Driving Incidents: car wheels crossed a lane demarcation line
Incidents were classified as “sleep related” or “non sleep related”
9
Results
Percent of drives successfully completed Average time to first incident
10
Results – Percent of Successful Completion
Normal sleep Sleep restriction0
102030405060708090
100
Control
OSA with CPAP
OSA without CPAP
Perc
ent
11
Results – Percent of Successful Completion
Normal sleep Sleep restriction0
102030405060708090
100
Control
OSA with CPAP
OSA without CPAP
Perc
ent
12
Results – Percent of Successful Completion
Normal sleep Sleep restriction0
102030405060708090
100
Control
OSA with CPAP
OSA without CPAP
Perc
ent
13
Results – Safe Driving Time
Normal Sleep Sleep Restriction0
20
40
60
80
100
120
Control
OSA with CPAP
OSA without CPAP
Tim
e (m
in) t
o fir
st in
cide
nt
14
Results – Safe Driving Time
0
10
20
30
40
50
60
Control
OSA with CPAP
OSA without CPAP
Tim
e (m
in) t
o fir
st in
cide
nt
Condition [F(1,36) = 9.24, p<0.05]Condition, group interaction[F(1,36) = 4.16, p<0.05]
15
Results – Safe Driving Time
0
10
20
30
40
50
60
Control
OSA with CPAP
OSA without CPAP
Tim
e (m
in) t
o fir
st in
cide
nt
OSA. Condition [F(2,20) = 8.8, p<0.05]
16
Summary of findings
UK Highway Code recommends to break from driving every 2 hours to avoid driver fatigue.
52.6% of all 2h drives were completed successfully. The drive presented was a ‘worst case scenario’.
Sleep restriction significantly affected both control and OSA participants.
OSA participants were more affected by sleep restriction than controls.
17
Implications
Recommend older drivers take a break from driving every 90 minutes, more often if sleep restricted. Older drivers do not cause a high percent of road traffic incidents
so may break from driving every 2 hours for reasons other than sleepiness.
Education of OSA patients: non-compliance with CPAP can significantly impair driving performance and vulnerability to sleep restriction.
18
Conclusion
It is important to get a full night’s sleep prior to completing a long motorway drive.
It is important for OSA drivers to be compliant with CPAP treatment every night.
19
Acknowledgements
Prof. Jim Horne,Loughborough UniversityDr Andrew Hall and Dr Chris Hanning, Leicester General Hospital
Thank you for listening
top related