fever management in icu - intensiv symposium€¦ · placebo in icu patients with fever and...
TRANSCRIPT
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Fever management in ICU
Dr Paul Young
@DogICUma
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2
I have no conflicts
of interest to
declare
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�Neurosyphilis resolves
after febrile illness
�Malaria causes a fever
�Malaria therapy for syphilis?Wagner-Jauregg J (1927) The treatment of dementia paralytica by malaria innoculation. Nobel Lectures: Physiology or Medicine 1922-1941. Elsevier, New York, pp. 159-169
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11
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n>500,000
No infection Infection
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fever is good because
it helps fight infections
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•It is unclear whether
administration of
paracetamol to treat
fever is beneficial OR
harmful
DE
SIG
NB
AC
KG
RO
UN
D
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16
•Phase 2b RCT comparing IV paracetamol with placebo in ICU patients with fever and infection
DE
SIG
N
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17
HypothesisIn ICU patients with likely
infection, using paracetamol to treat fever will ↓ ICU-free days
(by 2.2 days)
DE
SIG
N
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Inclusion CriteriaFever
+ Likely infection
DE
SIG
N
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19
Exclusion Criteria
Contraindications or
Acute brain pathologies
DE
SIG
N
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Paracetamol 1g IV 6hrly
or
Placebo
DE
SIG
N
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When study treatment stopped
1. Fever resolved2. Antimicrobial therapy ceased 3. Discharged from ICU4. Day 285. Contraindication to paracetamol
developed
InterventionD
ES
IGN
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22
InterventionD
ES
IGN Gave study drug
until morning of
day 2
Afebrile for
24 hours?
Withheld
study drug
Restarted
study drug
Ceased
study drug
permanently
Continued
study drug
Assessed
patient daily
Fever
within 48
hours?YES
NO
YES
NO
Fever resolution
algorithm
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23
DE
SIG
NC
ON
SO
RT
Met inclusions
(n=3601)
Met exclusions (n=1674)
Contraindications to paracetamol (n=652)
Acute brain pathologies (n=519)
Did not consent (n=174)
Randomised
(n=700)
Eligible but missed (n=1053)
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24
DE
SIG
NC
ON
SO
RT
Randomised
(n=700)
Paracetamol (n=352)
Received allocated intervention
(n=344)
Consent withdrawn (n=6)
Analysed (n=346)
Placebo (n=348)
Received allocated intervention
(n=339)
Analysed (n=344)
Consent withdrawn (n=4)
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Treatment groups had similar
baseline characteristics
PAR
TIC
IPAN
TS
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• Age 60 years• ⅔ male• Most common comorbid conditions
were diabetes (25%) & cancer (20%)• >80% had severe sepsis• ≈50% invasively ventilated• ≈50% on inotropes / vasopressors• APACHE-II scores around 19
PAR
TIC
IPAN
TS
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DE
SIG
NIN
TE
RV
EN
TIO
N
Percentage of study patients in ICU receiving study medication
study day
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28
DE
SIG
NC
OIN
TE
RV
EN
TIO
NS
Percentage of study patients in ICU receiving open label paracetamol
study day
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29
DE
SIG
NT
EM
PE
RAT
UR
E E
FF
EC
TS
baseline 0 1 2 3 4 5 6 7
study day
40°C
39.5°C
39.0°C
38.5°C
38.0°C
37.5°C
37.0°C
36.5°C
36.0°C
Maximum body temperature
P<0.001
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30
DE
SIG
NT
EM
PE
RAT
UR
E E
FF
EC
TS
baseline 0 1 2 3 4 5 6 7
study day
40°C
39.5°C
39.0°C
38.5°C
38.0°C
37.5°C
37.0°C
36.5°C
36.0°C
Mean body temperature
P<0.001
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OU
TC
OM
ES
Primary outcome
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32
DE
SIG
NO
UT
CO
ME
S
Paracetamol
(n=346)
Placebo
(n=344)Difference
(96.21%CI)
P value
ICU-free days
23 days
[IQR 13-25]
22 days
[IQR 11.5-25]
0 days
(0 to 1)0.07
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33
DE
SIG
NIC
U-F
RE
E D
AYS
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34
DE
SIG
NO
UT
CO
ME
S Paracetamol
(n=346)
Placebo
(n=344)Relative Risk
(95%CI)
P value
Mortality
Day 28 13.9% 13.7%1.02
(0.68 to 1.52)0.94
Day 90 15.9% 16.6%0.96
(0.66 to 1.35)0.84
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35
DE
SIG
NO
UT
CO
ME
S
P=0.80
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36
DE
SIG
NO
UT
CO
ME
S
Paracetamol
(n=346)
Placebo
(n=344)Exponent*
(95%CI)
P value
ICU length of stay (days) <0.001
Non-
survivorsMedian: 10.4 days
[IQR, 4.1-16.9]
Median: 4.0 days
[IQR, 1.7-9.4]
2.12
(1.43 to 3.13)<0.001
SurvivorsMedian: 3.5 days
[IQR, 1.9-6.9]
Median: 4.3 days
[IQR, 2.1-8.9)
0.84
(0.70 to 0.99)0.01
*The exponent of the difference can be interpreted as the ratio of the means
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37
DE
SIG
NA
DV
ER
SE
EV
EN
TS
Paracetamol
(n=346)
Placebo
(n=344)Odds Ratio
(95%CI)
P value
Liver Dysfunction
8.1% 9.9%0.89
(95% CI: 0.69 to 1.16)0.40
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Paracetamol did not alter ICU-free daysin patients with fever and likely
infection
DE
SIG
NC
ON
CLU
SIO
NS
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Paracetamol appears to
have a modest antipyretic effect in
adult ICU patients with fever and likely infection
DE
SIG
NC
ON
CLU
SIO
NS
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40
Paracetamol appears to
be well tolerated in
adult ICU patients with fever and likely infection
DE
SIG
NC
ON
CLU
SIO
NS
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fever is bad because it
increases metabolic & physiological demands
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if an illness is
reversible, ICU
therapy allows patients to survive
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...if they can be
supported long
enough to recover
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fever is
common
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tolerance of the
physiological demands created by
fever may be poor
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one potential way to
protect patients
from the physiological
demands of fever...
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is to systematically
prevent & treatfever
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Schortgen F et al. Fever control using external cooling in septic shock: a randomized controlled trial. Am J Respir Crit Care Med. 2012 May 15;185(10):1088-95. Pubmed ID: 22366046.
Sepsiscoolstudy
SE
PS
IS C
OO
L
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IBU
PR
OF
EN
Bernard GR, Wheeler AP, Russell JA, Schein R, Summer WR, Steinberg KP, Fulkerson WJ, Wright PE, Christman BW, Dupont WD, Higgins SB, Swindell BB. The effects of ibuprofen on the physiology and survival of patients with sepsis. The Ibuprofen in Sepsis Study Group. N Engl J Med. 1997 Mar 27;336(13):912-8.
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risks /
benefits
least sick
patients
most sick
patients
benefits of
fever
costs of
fever
costs of fever
exceed benefits
(i.e. fever should
be treated)
benefits of fever
(infection)
benefits of fever (no
infection)
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51
How to
monitortemperature
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52
core vs.
peripheral
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Take home point #1:
The conversion from
peripheral temp to core
temp by adding 0.5°C is
not supported by
evidence
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54
tympanic vs. bladder
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55
axillary vs. bladder
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56
nasopharyngeal vs. bladder
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Take home point #2:
The temperature on the
ICU chart is not as
accurate as you think
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58
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Axillary
temperature
monitoring
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• Death associated with very
high body temperature
• Intermittent monitoring of
axillary temperature failed to
detect a potentially life
threatening fever
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Take home point #3:
If the axillary
temperature exceeds
39°C consider
continuous monitoring
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How I treatfever
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think of sepsis
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very high
fever
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acute brain
pathologies
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Take home point #4:
If I make a clinical
decision that controlling
fever is important then I
typically administer
paracetamol regularly
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Physical
cooling
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The problem
with surface
cooling
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Take home point #5:
In morbidly obese patients
with very high temperature
external cooling stimulates
intense vasoconstriction &
can make the core
temperature rise initially
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NSAIDS
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Ibuprofen
800mg Q6hrly
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Take home point #6:
48 hours of ibuprofen
appears to safe and well-
tolerated in sick ICU
patients
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risks /
benefits
least sick
patients
most sick
patients
benefits of
fever
costs of
fever
costs of fever
exceed benefits
(i.e. fever should
be treated)
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Randomised Evaluation of Active Control of Temperature vs. ORdinary temperature
management (REACTOR)
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multi-centre, phase II, open-label,
feasibility trial...
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...comparing combined
prophylactic IV paracetamol and early
targeted physical cooling to treat fever
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...with standard temperature management
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...in mechanically ventilatedadults without acute brain
pathologies who are
expected to be ventilated
beyond the day after randomisation
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Inclusion Criteria
• ≥18 years
• Invasive ventilation in ICU
• Expected to remain ventilated beyond the next calendar day
• Temp 37.8°C or more in the previous 12 hours
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Exclusion C
riteria
• Acute brain pathologies
• Recent cardiac arrest
• Regular paracetamolcontraindicated
• Dying
• Previously enrolled
• Eligible >24 hrs ago
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Control • Standard care
• If paracetamol is used it should be PRN
• Avoid paracetamol by the IV route unless there is a specific indication
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Intervention
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Monitoring of tem
perature
• Temporal artery & axillary thermometers should not be used
• Continuous monitoring of core temperature while ventilated
• Tympanic when core not possible
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Intervention
• Shivering treatment:(i) Opioid bolus
(ii)Sedation
(iii)Neuromuscular paralysis
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Investigation of fever
Temp ≥37.8°C should
trigger investigation for
new infection and
consideration of empirical therapy for
new sepsis
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Prim
ary outcome
The between group
difference in mean body temperature calculated
from the body temperatures measured six hourly for
seven days (168 hours) or until ICU discharge whichever is sooner
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Secondary outcom
e
ICU-free days
In hospital mortality
Survival time to day 28 (censored at hospital
discharge)
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Sam
ple size & recruitm
ent
184 patients
90% power
12 sites
1.5 patients per site per month
10 months total
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Sick people should have core
temperature monitoring
Aggressive treatment of fever
may benefit patients with
limited physiological reserves
(especially in the absence of
infection)