Sedation and Analgesia.ppt

Pain management in the Pediatric Pain management in the Pediatric

Emergency DepartmentEmergency Department

Itai Shavit, MDAlberta Children’s Hospital November 2001

1. Pain in children: Perception, Myths, Attitudes and Ethics 2. Pediatric pain assessment 3. Pediatric Procedural Sedation and Analgesia (PSA) 4. Narcotic analgesia in acute abdomen 5. Topical analgesia 6. Neonatal & Sucrose analgesia 7. AAP, September 2001 guidelines 8. Summary

ObjectivesObjectives

Pain in children: Perception, Myths,

Attitudes and Ethics

An unpleasant sensory or emotional experience associated with actual or potential tissue damage, or described in terms of such damage (International Association for the study of Pain: IASP,1979)

Does the human neonate capable of perceiving pain ????

The definition of painThe definition of pain

In the eighties, Premature infants who had major surgeries were treated with minimal anesthesia during and after the surgery (normal standard)

Pain and its effects in the human neonate and fetus.1987, NEJM. Landmark seminar paper. Anand and Hickley Called into question the widely held belief that neonates do not have the Neurophysiologic apparatus required to experience pain

The concept of pain perception The concept of pain perception

AAP & APS policy statement, 09/2001AAP & APS policy statement, 09/2001

“The concepts of pain and suffering go well beyond that of a simple sensory experience. It has emotional, cognitive, and behavioral components as well as developmental, environmental and sociocultural aspects” (AAP and American Pain Society policy statement, September, 2001)

MythsMyths

Myth 1: “Babies don’t feel pain” Myth 2: “Babies don’t remember” Myth 3:

“My son doesn’t need pain killers” “No pain no gain”, “Pain is character building”

Babies do experience pain!Babies do experience pain!

Myth 1: “Babies don’t feel pain...”

By 29 wks of gestation, pain pathways and cortical + sub-cortical centers involved in the perception of pain are well developed, as are the Neurological systems for the transmission and modulation of pain sensation

Pain sensitivity in neonates may be more profound that that of older individuals; their nervous system may be less effective at blocking painful stimuli than those of adults

Babies do remember pain!Babies do remember pain!

Myth 2: “They don’t remember...”

Effect of neonatal circumcision on pain response during subsequent routine vaccination. 1997, Lancet. Taddio, Kats, Ilersich, Koren

Does neonatal circumcision alter pain response at 4-month or 6-month vaccination compared with the response of uncircumcised infants?

Prospective. cohort design. 87 patients.

3 groups: uncircumcised infants, circumcised infants who had randomly pretreated with either EMLA cream or Placebo for circumcision in a previous clinical trial

All infants were videotaped during vaccination in a primary care clinic. Videotapes were “blindly” scored by a trained research assistant. The score measured facial action, cry duration and visual analogue scale

Results: Circumcised infants showed a stronger pain response to subsequent routine vaccination than uncircumcised infants. Among the circumcised group, preoperative treatment with EMLA attenuated the pain response to vaccination

The pain itself may not be consciously remembered but the painful experience does

Consequences of inadequate Analgesia during painful procedures in childen. 1998, Arch Ped Adolesc Med. Weisman, Bernstein, Schechter

How does inadequate Analgesia for painful procedures (BMA, ST) effect pain response in subsequent procedures?

Cohort study, randomized, placebo control (Placebo vs Oral Transmucosal Fentanyl), small sample

Young children (<8y) who received placebo in previous procedure had consistently higher pain scores than children who had proper analgesia

Pain is not character building,Pain is not character building, it has a negative influence on children !it has a negative influence on children !

Myth 3: “Pain is character building…”

This statement is unfair. It legitimizes pain and takes away the child’s right for pain relief

Children younger than 8 years are not able to understand that short term pain may have long term benefit

Adolescents who had poorly managed pain procedures show increased level of anxiety in subsequent pain situations

Pain is a subjective experience and is incomparable. There is no direct relationship between “pain experience” and pain intensity or between physical pathology and pain intensity

Our fear of Analgesia...Our fear of Analgesia...

Masking of symptoms and signsChanges in the examSide effects and complications

EthicsEthics

The Ethics of pain control in Infants and children. Walco GA, Cassidy RC, Schechter NL, NEJM, 1994;331(8):541-43

“…The assessment and treatment of pain in children are important parts of Pediatric practice, and failure to provide adequate control of pain amounts to substandard and unethical medical practice

Significant fluctuations in HR, BP, ICP, Oxygen level, and stress hormones level

Sleep disturbances, agitation, crying

Short term effects of inadequate pain managementShort term effects of inadequate pain management

Long term effects of inadequate pain managementLong term effects of inadequate pain management

Inadequate surgical pain management has more clinical complications, prolonged hospitalization time and higher mortality rates

Behavioral and Psychological sequaela

Pediatric pain assessment

We’ve all experienced pain

Anxiety decreases pain threshold

Inability to verbalize pain appropriately under 2 years of age. At age 3-7 most children are competent to provide accurate information (using assessment tools)

Pain is a subjective experience therefore individual self report is favored (AAP recommendation)

Behavioral pain measures are more useful than physiological parameters. Physiologic parameters are unreliable

Pediatric pain assessment scalesPediatric pain assessment scales

Pediatric pain assessment scalesPediatric pain assessment scales

0-2 Years: Neonatal Infant Pain Scale, Premature Infant Pain Profile, Neonatal Infant Pain Scale, DAN score

3-7 years old: FACES pain rating scale, OUCHER Scale 7< years old: Verbal Report Scale, Visual Analog Scale

Pain Assessment tools

Neonatal pain assessment Neonatal pain assessment

Facial expression

Eyes squeeze Brow bulgeNasolabial furrow

Vocal expression

Circumcision

DAN score: Acute pain rating scale in neonatesDAN score: Acute pain rating scale in neonates(Douleur Aigue du Nouuveau-ne, 1997)

Facial expressionFacial expression: Calm (0), Snivels and alternates gentle eye openining and closing (1), Determine intensity of one or or more of eyes squeeze, brow bulge, nasolabial furrow: Mild, intermittent with return to calm (2), Moderate (3), Very pronounced, continuous (4)

Vocal expressionVocal expression: No complaints (0), Moans briefly: for intubated child, looks anxious or uneasy (1), Intermittent crying: for intubated child, gesticulations of intermittent crying (2), Long lasting crying, continuous howl, for intubated child, gesticulations of continuous crying

Limb movementsLimb movements: Calm or gentle movements (0), Determine intensity of one or more of the following signs:pedals, toes spread, legs tensed and pulled up, agitation of arms, withdrawal reaction: Mild, intermittent with return to calm (2), Moderate (3), Very pronounced, continuous (4)

FACES pain rating scale (3-7 years)FACES pain rating scale (3-7 years)

The Wong Baker Scale

OUCHER scale (3-7 years)OUCHER scale (3-7 years)

Available in versions for males and females and in multicultural forms. The child is asked to point to the picture that best shows how he or she feels

Categorical

Verbal Report Scale (>7 years)Verbal Report Scale (>7 years)

“On a scale of 0 to 10, with 0 being ‘no pain’ and 10 being ‘the worst pain ever’, how would you rate your pain?”

Categorical

Visual Analog Scale (>7 years)Visual Analog Scale (>7 years)

A straight line. The left end of the line representing no pain and the right end of the line representing the worst pain. Patients are asked to mark on the line where they think their pain is

Non categorical

Visual Analog Scale (>7 years)Visual Analog Scale (>7 years)

Non categorical

“The greatest pain imaginable”

“No pain”

Pediatric procedural analgesia

Sedation and Analgesia for procedures in children 2001,NEJM. Krauss, Green

Management of acute pain and anxiety in children undergoing procedures in the Emergency Department. 2001, Pediatric Emergency Care. Krauss

Pharmacological Management of pain and anxiety during Emergency procedures in children. 2001, Paediatric Drugs. Kennedy, Luhmann

Guidelines for Pediatric procedural sedation and analgesia

12 different definitions for state of sedation. Most of them are based on the degree of sedation induced rather than the specific indication for sedation

Only 4 are applicable for children

TerminologyTerminology

A medically controlled state of depressed consciousness that: 1. Allows protective reflexes to be maintained. 2. Retains the patient ability to maintain a patient airway independently and continuously 3. Permits appropriate response by the patient to physical stimulation or verbal command, e.g., “open your eyes”.

Conscious Sedation, AAP, 1992Conscious Sedation, AAP, 1992

A medically controlled state of depressed consciousness or unconsciousness from which the patient is not easily aroused. It may be accompanied by a partial or complete loss of protective reflexes, and includes the inability to maintain a patent airway independently and respond purposefully to physical stimulation or verbal command.

Deep Sedation, AAP, 1992Deep Sedation, AAP, 1992

A medically controlled state of depressed consciousness accompanied by a loss of reflexes including the inability to maintain a patent airway independently and respond purposefully to physical stimulation or verbal command

General Anesthesia, AAP, 1992General Anesthesia, AAP, 1992

A Technique of administering sedatives or dissociative agents with or without analgesics to induce a state that allows the patient to tolerate unpleasant procedures while maintaining cardiorespiratory function. Procedural sedation and analgesia is intended to result in a depressed level of consciousness but one that allows the patient to maintain airway control independently and continuously. Specifically, the drugs, doses, and techniques used are not likely to produce a loss of protective airway reflexes.

Significant improvement over the traditional AAP terminology

Procedural Sedation and Analgesia (PSA), Procedural Sedation and Analgesia (PSA),

ACEP, 1998ACEP, 1998

Midazolam Reduce dose when used in combination with Opioids

Ketamine Higher risk for hallucinations > 15y, may be blunted with Midazolam . Adding Midazolam to Ketamine in children younger than 15y appears to be unnecessary (Sherwin et al, Ann Em Med, 2000)

Hypersalivation can be minimized with Atropine (poor evidence)

Fentanyl Reduce dose when combined with Midazolam

PrecautionsPrecautions

Propofol Currently not (yet) recommended for PSA in children. High risk for apnea and loss of airway reflexes. No analgesic effect. Insufficient data (only one study in children)

Etomidate, Methohexital Insufficient data in children for safety and reliability

Ultra-Short acting medicationsUltra-Short acting medications

Oral Transmucosal Fentanyl (lozengens) High rate of emesis (>30%)

Intranasal Sufentanyl Insufficient data on safety and efficacy in children. 7 times more potent than Fentanyl. With Midazolam for lacerations. The nasal delivery is painless, no vomiting . Mean time to sedation 20 min, discharge time 54 min. Expensive.

Oral Ketamine Insufficient data. Optimum oral dose for safe and reliable sedation for PSA has to be determined. Long discharge time (100 min)

Oral/Intranasal medications for PSAOral/Intranasal medications for PSA

Naloxon Introduced in 1960, proven to be safe in children. Opioid antagonist of choice for PSA

Flumazenil Introduced in 1987, proven to be safe in children

Nalmefen New Opioid antagonist, Introduced in 1995, proven to be useful in adults. Long acting (3.5h).

Only one study in children (Nov 2001, Ann Em Med): Patients who had PSA with Fentanyl/Midazolam received Nalmefen after the procedure. Sedation reversal parameters were improved, no side effects, no cardiorespiratory changes, no resedation phenomena. Nalmefen seems to be effective in children. (small sample)

AntagonistsAntagonists

Narcotic analgesia in the pediatric acute abdomen

The Ethical dilemma of withholding analgesia while awaiting surgical evaluation

4 prospective randomized controlled double blind studies in adults, no studies in children

All 4 studies use Morphine sulfate or Morphine derivatives

Narcotic analgesia in acute abdomenNarcotic analgesia in acute abdomen

In all studies, opiates didn’t change management and were not found to be associated with increased morbidity or mortality. None of the trials was able to identify even one patient in which analgesia led to a poor outcome

In adults the use of narcotic analgesia doesn’t mask symptoms or change the physical exam findings

In children there is no data

Narcotic analgesia in acute abdomenNarcotic analgesia in acute abdomen

Topical analgesia

Needlephobia

Topical anesthetics do not reduce needlephobia

Coping strategies used by parents proved to significantly reduce stress (e.g. favorite toy, books, singing songs)

Both child and parents have to be fully aware of what is going to occur and the reasons why

For IV cannulation and lumbar puncture. Not recommended for IM injection or heel prick in neonates

Mixture of 2.5% lidocaine and 2.5% prilocaine in a cream base. The specific concentration gradient promote penetration of intact skin

Application under an occlusive dressing. Depth of anesthesia ranges from 3mm after 60 min (onset to pick effect), to 5 mm after 90

EMLAEMLA

Should be placed on skin for at list 60 min. Changing Triage protocols?

Safe. Recently been approve to for use in newborns.

Single dose does not cause Methemoglobinemia (Prilocaine side effect)

EMLAEMLA

4% Tetracaine cream (Amethocaine) Applied under occlusive dressing Rapid onset of action (30 to 40 min) Provide anesthesia for up to 4 hours Should not be used in neonates (irritation, even blistering)

Tetracaine creamTetracaine cream

Ametop Gel (Smith & Nephew 1997)

Subcutaneously injected buffered lidocaine 1% (1/10 with Bicarbonate solution of 1meq/ml) using 30-gauge needle, reduces struggling during LPs in newborns

± EMLA or Ametop (>1mo) prior the procedure if possible Buffering decreases onset time for analgesia without affecting

efficacy or duration To reduce pain: Distract the patient, use buffered lidocaine,

use 30 (for infants) or 27 gauge needle, warm the anesthetic to body temperature prior administration, avoid intradermal injection

Lidocaine injectionLidocaine injection

Neonatal analgesia

Acetaminophen? Not effective in controlling neonatal procedural pain Ibuprofen? Its safety under 6 months of age hasn’t been established Codeine? Codeine requires the conversion to its active component,

Morphine. This enzymatic conversion activity is <10% of that seen in adults

Analgesia for minor invasive procedures in neonatesAnalgesia for minor invasive procedures in neonates

(Neonates usually suffer more than one poke……)

Sucrose analgesia

Since 1991, 14 RO,CO,BL studies were published

All studies found sucrose to be safe and effective in reducing neonatal procedural pain (using various neonatal pain rating scales)

most studies used 24% sucrose, 30% sucrose or 30% glucose

Sucrose elicits analgesia in neonates when Sucrose elicits analgesia in neonates when administered prior to a painful procedureadministered prior to a painful procedure

Infant rats showed attenuated pain response when given intraoral infusions of sugar (1987, Blass et al,Pharmacol Biochem Behav)

1991, Blass & Hoffmeyer, Pediatrics. First report in neonates. 24% Sucrose solution proved to attenuate pain, especially when given with pacifier (Circumcision, small sample, only % of crying time was measured)

The phenomenon of sucrose analgesiaThe phenomenon of sucrose analgesia

Endogenous Opioid release? The animals analgesia was reversible with the administration of opiate antagonist

Perception of sweet taste signaling pain pathways ?

How does pacifier elicit analgesia? Pacifier may promotes sucking and calming that increase pain threshold by reducing stress/anxiety

Theoretical MechanismTheoretical Mechanism

DAN score during venepuncture in 150 newbornsDAN score during venepuncture in 150 newborns

Carbajal et al, BMJ, 1999

Optimal sugar solution ? Optimal dose ?

The suggested solution for practical purposes is sucrose 25 gram dissolved in 100cc of sterile water, or D25W

Practical considerationsPractical considerations

Technique: 1. Two minutes prior procedure, put the pacifier soaked with

sugar solution in baby’s mouth. Coat the pacifier with the solution repeatedly during the procedure Or

2. Two minutes prior procedure, Slowly (30 sec) administer 2cc of the solution to the tongue, then allow him to suck the pacifier during the procedure

Practical considerationsPractical considerations

Treatment of infants older than 1 month with sucrose solution?

Insufficient data. One study showed improved pain response when given to children at 2-4 months prior immunization

AAP / APS policy statement September

2001

The assessment and management of Acute The assessment and management of Acute pain in Infants, Children, and Adolescentpain in Infants, Children, and Adolescent

The AAP and APS jointly issued this general statement to emphasize the responsibility and the obligation of Physicians to treat acute Pain in children

Discusses myths about pain in children, the importance of pain assessment, procedure related pain and recommends using guidelines for PSA

Policy Statement, 09/2001 American Academy of PediatricsAmerican Pain Society

The assessment and management of Acute The assessment and management of Acute pain in Infants, Children, and Adolescentpain in Infants, Children, and Adolescent

“Because of the diversity and complexity of the clinical issues present; pain treatment, including

choice of drug, dosage, and route, must be tailored to the individual patient, and analgesic

given in the overall context of what is best for the patient”

Policy Statement, American Academy of PediatricsAmerican Pain Society

Summary

Pain has short and long term effects on children Assessment of pain should be part of the PE Pain is a subjective experience, Treat the individual ! Use PSA guidelines Insufficient data to support narcotic analgesia in Pediatric

acute abdomen EMLA (60 min), Ametop (30 min), Buffered lidocaine 2001, AAP policy statement “Just stick the sweetened soother in!”

[email protected]@LISTSERV.BROWN.EDUPediatric Emergency Medicine Discussion ListPediatric Emergency Medicine Discussion List

“Would you give analgesia to a child with a fracture, prior to obtaining parental consent?”

2001

[email protected]@LISTSERV.BROWN.EDUPediatric Emergency Medicine Discussion ListPediatric Emergency Medicine Discussion List

2001

“Pain is an emergency. It should be treated regardless of parental consent” Bill Zempsky, Connecticut