Sedation and analgesia in pediatric mechanical ventilation...
Transcript of Sedation and analgesia in pediatric mechanical ventilation...
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Sedation and analgesia in pediatric mechanical
ventilation: are we doing it optimally ?
Dick Tibboel; Erwin Ista; Nienke Vet; Monique van Dijk
Erasmus MC – Sophia Children’s Hospital
Rotterdam, The Netherlands
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Sleep deprivation
Environment (Light and Noise)
Sedatives
Critical illness
Caregiver interaction
Post-traumatic stress (trauma/burns)
Changes in sleep-wake cycle
Circadian rhythm disturbance
Sleep loss / fragmentation
Physiologic sedative Dependence (→ iatrogenic withdrawal)
Prolonged MV
Delirium
Changes in long-term neurocognition Kudchadar et al. (2014) Sleep Medicine Reviews
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Finding the optimal balance between
analgesia, sedation, anxiolysis and sleep is
integral to the care of PICU patients
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CCM 2013
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Adult patients!
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CCM 2013
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Prevention of iatrogenic withdrawal
Change of sedation practice:
Daily interruption of sedation
Change drug: from benzo’s to dexmedetomidine/clonidine
Nursing-controlled sedation management protocol
Drug rotation
e.g. Morphine fentanyl
Gupta et al. 2012
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Intensive Care Med 2016
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COMFORTneo scale
Six behavioral items
Alertness (redefined)
Calmness
Respiratory response
or crying (in non-
ventilated patients
Facial tension
Body movements
Muscle tone (mere
observation no touch)
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Midazolam
Short acting benzodiazepine
Short elimination half life, time to peak sedation is 5 – 10 min. after
IV use
Duration of action 30 – 120 min.
Metabolised by CYP450 enzym 3A4 and Glucuronidated
Main adverse effects: tolerance, dependency and withdrawal;
respiratory depression
Licensed throughout the EU and in the USA
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Clonidine
Alpha-2 adrenoreceptor agonist
Long eliminiation half life of 9 – 17 hours
Loading dose required for therapeutic steady state concentrations
Produces sedation without respiratory depression and exerts
anxiolytic effects together with analgesic effects
Is a hypotensive agent for treatment of arterial hypertension
Adverse effects: hypotension and bradycardia
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PCCM, 2014
Editorial PCCM, 2014
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SLEEPS-study
RCT of IV Midazolam versus IV Clonidine
Calculated sample size 1000 PICU patients
PICU’s in the UK
Outcome: efficacy of sedation
Study stopped preterm due to low inclusion of N=200 patients
No PK-data available
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Propofol (2,6-diisopropyl phenol)
Used for short or long term sedation
Commercially available as 1%. 2% and 6%
Only advised for short duration procedures
FDA warning for children less than 12 years of age due to the
propofol infusion syndrome
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Dexmedetomidine
Central acting Alpha-2 adrenoreceptor agonist
Same physiological effects as Clonidine
Half life time 2 – 3 hours, titration by IV administration
Approved by FDA for short term sedation of adult! patients
during mechanical ventilation and for monitored anesthesia care
No specific pediatric indications but extensively used in PICU’s
and operating rooms predominantly in the US
So far high costs euro 65 compared to midazolam euro 2,50
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Pediatric Cardiac Intensive Care Society 2014
Consensus Statement: Pharmacotherapies in
Cardiac Critical Care: Sedation, Analgesia and
Muscle Relaxant
Lucas SS et al. Pediatr Crit Care Med, 2016;17:S3-S-15
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Conclusions:
Multiple pharmacological therapies exist to
achieve these goals and should be selected
based on the patient’s underlying physiology,
hemodynamic vulnerabilities, desired level of
sedation and analgesia, and the projected short-
or long-term recovery trajectory.
Lucas SS et al. Pediatr Crit Care Med, 2016;17:S3-S-15
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CONCLUSION:
Neonates and young infants have a decreased metabolism of
common opioids like fentanyl and therefore are more prone to
respiratory depression.
Remifentanil could be the ideal opioid for analgesia and sedation
of mechanically ventilated infants.
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PCCM 2013
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IATROGENIC WITHDRAWAL
Withdrawal Syndrome in ventilated children
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Undersedation
Agitation
Risk of displacement of tubes, etc.
Risk of oversedation:
•Prolonged mechanical ventilation
• Higher incidence of
• Delirium
• Withdrawal syndrome
• Increased health care costs
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Definition of terms
Tolerance:
Decreasing clinical effects of a drug after prolonged exposure to it (Tobias, 2000; Anand, 2010)
Physical dependence:
A physiologic and biochemical adaptation of neurons such that
removing a drug leads to withdrawal or an abstinence syndrome
(Cunliffe et al., 2004; Anand, 2010)
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Withdrawal Syndrome in Children
Withdrawal syndrome:
A set of symptoms that manifests when a drug which causes physical
dependence is stopped, reduced too quickly or antagonized
(Cunliffe et al., 2004; Anand & Arnold, 2010)
Onset depends on half-life of drug and its metabolite
Onset depends on clearance of active metabolites
Signs and symptoms of withdrawal may present
1 hour to 5 days after discontinuation
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Withdrawal syndrome, a problem??
Opioid withdrawal:
• Neonates (ECMO): 57% (Arnold et al. 1990; Franck et al. 1995)
• Children (57%) (Katz et al., 1994)
Benzodiazepine withdrawal:
• 17 to 35% (Hughes et al., 1994; Fonsmark et al., 1999)
Combined - benzo’s / opioids:
• 34 to 76%
(Sfoggia et al. 2003; Fernandez et al. 2012; Franck et al. 2008 & 2012; Ista et al. 2013)
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Risk factors
Duration of infusion ≥ 5 days
Dosages (maximum, cumulative dose)
Fentanyl: 1.6-2.5 mg/kg (Arnold et al., 1990; Katz et al., 1994)
Midazolam: 60 mg/kg, >70mg/kg (Fonsmark et al., 1999; Ista et al., 2008)
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Withdrawal symptoms
Behavioral (CNS) Gastrointestinal Physiological / other
Agitation Vomiting Heart rate (tachycardia)
Anxiety Diarrhea Arterial blood pressure (hypertension)
Increased muscle tone Poor feeding Breathing rate (tachypnea)
Tremors Fever
Motor disturbance Sweating
Inconsolable crying Sneezing
Sleeping pattern Yawning
Grimacing Mottling
Pupil dilation
Convulsions / seizure
Hallucinations
High-pitched crying
Hyperactive Moro-Reflex
Ista et al. 2007
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Withdrawal syndrome assessment tools - Children
Instrument (author, year)
Patients Observation items Reliability
& validity CZS GI Auto Others
Sedation withdrawal score
(SWS) (Cunliffe, 2004)
Children X X X -
Opioid Benzodiazepine
Withdrawal Score (OBWS) (Franck et al., 2004)
Children
X X X X +/-
Withdrawal Assessment
Tool version 1 (WAT-1) (Franck et al., 2008)
Children X X X X
+
Sophia Observation
withdrawal Symptoms-scale
(SOS) (Ista et al., 2009)
Children X X X +
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(Franck et al., 2008 & 2012) Cut off score: ≥3 withdrawal
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Sophia Observation withdrawal Symptoms-
scale (SOS)
Ista et al. Intensive Care Med 2009
Cut off score: ≥4 withdrawal
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Weaning protocol
Sedatives/opioids
5-9 day Sedatives/opioids
≥ 10 days
Monitor level of sedation with COMFORT behaviour
scale
Monitor withdrawal symptoms with SOS
Decrease
sedatives/opioids
10% per 8hrs
Decrease
sedatives/opioids
10% per 24hrs
If necessary:
1. Switch IV to oral
2. Decrease sedatives/
opioids 10% per 8hrs
1. Switch IV to oral
administration
2. Decrease sedatives/
opioids 10% per 48hrs CAVE:
switching takes
± 48 hrs per
drug; One drug
at the time
e.g. Morphine
methadone
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agitation
body movements
Sleep problems
tremors
Vomiting and diarrhea
confusion
anxiety
irritable
fidgety
Pulling out lines
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DELIRIUM
Pediatric Delirium in ventilated children
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Delirium
Acute Brain failure
DSM-IV definition: (Diagnostic and Statistical Manual of Mental Disorders)
1. Disturbance of consciousness
2. Change of cognition
3. Acute onset and fluctuation
4. Physiological consequence
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Phenomenology
There are 3 subtypes which often switch during day and NIGHT (“sun
downing”)
Hyperactive
Agitation – pulling lines out, motor disturbance - restlessness,
impaired alertness etc.
Hypoactive (“still or quietly delirium”)
Apathy, slow/sparse speech, hallucinations
Mixed hypo- and hyperactive
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Delirium ….. a problem?!
Danger for the patient himself
Neurometabolic stress
Traumatic event for parents, caregivers
1/3 of patients suffers from PTSD (Colville et al. 2008)
Colville G, Kerry S, Pierce C. Children's factual and delusional memories of intensive care. Am Respir Crit Care Med 2008;177(9):976-982.
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Prevalence of Delirium
0
5
10
15
20
25
30
%
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Risk factors for developing delirium
Sleep deprivation
Sedatives / opioids (iatrogenic withdrawal)
Environmental factors (light, noise)
Infection
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Assessment of Pediatric Delirium in PICU
patients
Cognitive function
Pediatric Confusion Assessment Method-ICU (Smith et al. Crit Care Med 2011)
Observational / behavioral
Pediatric Anesthesia Emergence Delirium Scale (Sikich et al. Anesthesiology
2004)
Cornell Asssessment of Pediatric Delirium, CAP-D (Silver et al. Intensive Care
Medicine 2012; Traube et al. 2013 Crit Care Med)
Adapted Sophia Observation withdrawal Symptoms-Pediatric Delirium
scale (Van Dijk, Knoester, Beusekom, Ista, Intensive Care Medicine 2012)
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Instrument (author, year)
Population Sensitivity * Specificity * Cutoff
pCAM-ICU (Smith, 2011)
N=68
> 5 yrs. 83% (66-93%) 99% (95-100) Pos./neg.
PAED (Janssen, 2011)
N=154
1-17yrs. 91% (ND) 98% (ND) ≥8
PAED (Blankespoor, 2012)
N=144
1-18 yrs. 100 (ND) 91.7 (ND) ≥8
CAP-D (Silver 2010)
N=50
3m - 21yrs. 97% (ND) 91% (ND) ≥10
CAP-D (Traube 2013)
N=111
0 - 21yrs. 94% (84-99%) 79% (74-85%) ≥9
SOS-PD (Ista, Unpublished)
N=14
3m - 18yrs. 91% (76-98%) 97 (83-99%) ≥4
* (95% Confidence Interval)
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Treatment and Prevention of delirium
Non pharmacological
parental presence,
pictures of familiar people and objects,
familiar music
Promoting normal day-night cycle
Pharmacological
Haloperidol / Risperidone
Change sedation practice
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Summary
Be aware of effects of ventilation and sedation
Sleep deprivation
Withdrawal syndrome
Pediatric Delirium - neglected phenomenon
Assessment – first step, recognition
Sleep promotion
Exploration of initiatives of new sedation practices
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Intensive Care Med 2016
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Intensive Care Med 2016
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Intensive Care Med 2016
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Intensive Care Med 2016
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Challenges and solutions
Easy acces to training modules in different languages in a web based
way
Structured collaboration between hospital pharmacists and treatment
teams
Application of population PK-PD approaches for future trial design and
dosing
Detailed psychometric analysis of the existing pain assessments
instruments and prevent the use of 90 percent of the instruments
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Challenges and solutions
To perform research beyond acute pain such as for neuropathic- and
(sub) acute and chronic pain
Take into account the multidimensional character of pain;agitation and
fear
Do not score in the absence of a pharmacological sound treatment
algorithm based on population PK-PD and Physiology based PK
methodology
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Future perspectives:
The Perfect Neonatal Pain Measurement Instrument
(Sinno Simons 2004) ; still searching for the holy grail ?!
Pain: 6.8
GIVE MORPHINE
PAIN MEASURE
Pain: 6.8
GIVE MORPHINE
Pain: 6.8
GIVE MORPHINE
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Questions - Discussion
Acknowledgements:
Monique van Dijk
Dick Tibboel
Harma te Beest
Matthijs de Hoog
Enno Wildschut
Saskia de Wildt
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Video
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Clin Pharmacokinet. 2016 May;55(5):507-24
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Clin Pharmacokinet. 2016 May;55(5):507-24
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Clin Pharmacokinet. 2016 May;55(5):507-24
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Clin Pharmacokinet. 2016 May;55(5):507-24.
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Clin Pharmacokinet. 2016 May;55(5):507-24.
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Clin Pharmacokinet. 2016 May;55(5):507-24.
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Conclusion
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Intensive Care Med 2016
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Gaps in our knowledge
The uncertainty of the level of modulation of the nociceptive stimulus by
(non)-pharmacological interventions
The effect of previous pain experiences and its therapy on new painful
events (pain memory??)
The difficulty to “visualize” pain
The proven validity of many of the pain scales and their sensitivity to
change
The lack of a real interdisciplinary approach
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Questions of parents after admission
Will our child survive ?
How long will our child stay in the PICU ?
Will there be remaining problems after discharge ?
Do you guarantee that our child will not suffer
from pain and/or anxiety
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PAIN:is there a real difference ??
The use of “biomarkers” is widely accepted to determine therapy in
Sepsis
Acute kidney injury
Traumatic brain injury, but
Debatable in the assessment of pain and
eventually anxiety ??
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From No-scoring to One size fits All
Important methodological short comings
The quality of the studies using pain scores and it’s relative significance
is very variable
In many institutions appropiate training and subsequent implementation
is not well established
The real pharmacodynamic parameter for the use of analgesic drugs is
the change in pain score and the sensitivity to change of the score
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Pain is composed of 4 levels ( Loeser)
Nociception
The central nervous system
Perception
Behaviour
is a bio-psycho-social phenomenom
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No scoring of PAIN in your unit means:
Continuation of subjectivity of individual nurses and physicians
Denial of solid scientific data showing that validated PD parameters
have a major effect on drug dosing and even the choice of analgesic
drugs
Lack of transfer of objective parameters to your collagues resulting in
continuation of drug overdosing to keep the patient “quiet”
Lack of transferable approaches for “Precision Medicine” in the best
interest of the individual child
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Why do we monitor pain?
Pain is considered the 5th vital sign
Untreated pain results in increased mortality
Inadequate pain treatment, mainly overdosing, leads to prolonged
duration of artificial ventilation and LOS
To prevent suffering as the most important argument to treat and
monitor pain is:
to be HUMANE
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Intensive Care Med 2016
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The significant lack of articles on PICU patients is a real problem !!!
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SLEEP DEPRIVATION
Improving sleep quality in ventilated children
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Normal sleep pattern
Newborns:
Up to 18hrs per day (irregular schedule)
0-12 months
Becomes consolidated
3-12 years:
One period at night
Sleep 9-10hrs per nights
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Sleep problems
Recollection
“unable to sleep” 16-18%
(Playfor et al. 2000; Karande et al. 2005)
Observational studies (n=9) (Kudchadkar et al. 2014)
Decease REM sleep
“Catnaps”, frequently awake
Noise
Level 50-80 dBA (< 30 dBA WHO recommendation)
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Oral Clonidine 5 micrograms/kg versus placebo
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Intervention to improve Sleep-wake cycle
Non invasive
Earplugs, noise reduction protocols,
lighting optimization, sleep hygiene
Pharmacological
Melatonin, change of sedation
practice (clonidine, dexmedetomidine)
Culture change
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Inhibition proteins
Downregulation of
opioid receptors
Increased production NO
(Anand et al. 2010)
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Intensive Care Med 2016