Week 1 Management of Pain Flashcards
Opioid Considerations for Kidney Disease
What are the effects?
Avoid what meds?
Prefer what meds?
Decreased excretion leads to accumulation
Morphine, Codeine
Hydromorphone, Hydrocodone
Ketorolac*
How long can it be given?
LIMIT TO 5 DAYS THERAPY*
Afferent pathways =
CNS =
Efferent Pathways =
Sends signal to spinal cord
Discriminate & localized pain
Arouse and alert/activation “fight or flight”
Motivational factors
Module pain sensation
Nociceptive Pain*
Caused by damage to body tissue
Secondary to noxious stimuli
Opioid u - Agonist Pharmacologic Effects
GI, Biliary
Constipation
N/V
Increased biliary sphincter tone and pressure
Methylnaltrexone (Relistor)*
MOA
Elimination
Potential for
Acts on mu receptors in GI tract
Renally
GI perf
Fentanyl
Opioid conversion
0.1 IV
Tramadol*
MOA
Weak mu receptor binding
Inhibition of -> less resp depression and GI dysmotility
Morepinephrine and serotonin reuptake -> decreases seizure threshold
Disadvantages of Non-Opioids
____ effect of analgesia
SE of _____
Acute and chronic ____ ie APAP
Limited _____ availability
Ceiling
NSAIDS
Toxicities
Parenteral
Methadone*
Routes
PO
IV
Agonist/Antagonist Combo (Abuse deterrent)
Antagonists only act upon?
Examples
Manipulation of the product
Suboxone (buprenorphine/naloxone)
Embeda (morphine/naltrexone)
Opioid Dependent
Antagonist effect with withdrawal sx
Aspirin*
Onset Peak Duration Half Life Emlimination
15-20min 1-3 hr 3-6 hr 3 hr Urine and Liver
Opioid u - Agonist Pharmacologic Effects
Cardiovascular
Decreased myocardial O2 demand
Vasodilation and Hypotension
Class Wide Opioid Adverse Effects*
Constipation
- Is very
- Tx
Very common and persistence
Softener (docusate) + Stimulant (Senna, Bisacodyl)
Hydromorphone*
Half life
Excreted
Metabolites
Relatively short 2-3 hrs
NON-RENAL
NO METABOLITES
Tramadol*
Dosing
25-100mg q4-6 PRN
Salicylate Adverse Events (4)
GI irritation and bleeding (ulcers)
Dizziness, deafness, tinnitus (salicylism) with high doses
Reye’s Syndrome (liver disorder and encephalopathy) that occurs in children w viral infections
Asthmatics: increase risk of bronchospasm, urticaria, angioedema
COX Inhibition Chart*
Semiselective
Meloxicam, Diclofenac, Etodalac, indomethapiroxicam, piroxicam, nabumetone, sulindac
Increased affinity for COX2 but still retains for COX 1
Increased CV risk
Tramadol*
Routes
PO only
Ketorolac (Toradol)*
Is an _____
Routes
Indicated for what type of pain?
NSAID
PO, IV (the only parenterally available one)
Short term, moderate to severe*
Aspirin*
Properties
Analgesia
Anti-inflammatory
Anti-pyretic
Anti-platelet (prevents synthesis of Thromboxane A (vasoconstrictor and inducer of platelet aggregatio)
Codeine*
Used for what type of pain
Mild-moderate acute pain
is a weak agonist so low risk for abues
Methadone has ____ effects so caution w pts w hx of?*
Serotinergic
Seizures
Hydromorphone*
Dosing
2-4mg Q4-6 PO PRN
0.2-1mg Q2-3 IV PRN
Naltrexone (Vivitrol)*
Routes
IV, IM Depot
Hepatotoxic so used PO first!
Class Wide Opioid Adverse Effects*
Respiratory depression
- Tolerance within __-__ days
- increased risk for ____ insult
5-7
cardiac
Class Wide Opioid Adverse Effects*
Sedation
- Tolerance within?
days-weeks
Mepiridine
Opioid conversion
100, 300
Methadone*
Dosing
- 5mg Q8-12 PRN PO
2. 5 - 10mg Q8-12 PRN IV
Opioid Naive
Agonist activity with pain relief
Nalaxone (Narcan)*
What type of dosing may be required?
Repeated dosing
Bc half life of agonist and low systemic bioavailability dt extensive first pass
Morphine*
Routes
PO
PR (IV, IM, SQ)
Epidural, Intrathecal
Methadone*
Black Box Warning*
QTC - 500
(risk for fatal arrhythmias do EKG)*
Incomplete cross tolerance is likely due to subtle differences such as?
Affinity for opioid receptors
Converting between opioids when pain is controlled (can decrease by 25-50%) of equipotent dose
Moderate to severe pain: consider smaller dose reduction
Transmission: Ascending from
4)
3)
2)
1)
4) Brain stem, Midbrain, Cortex
3) Medulla
2) Spinal Cord
1) Peripheral pain receptors
Tramadol*
Metabolism
Excretion
CYP2D6
Renally and hepatically cleared - adjutment in dysfunction
Methylnaltrexone (Relistor)*
What is it used for?
What is it NOT used for?
OIC
NOT for acute reversal of toxic effects
NSAIDs General
Properties (4)
Interpatient _____
Potency and duration of action differ within group
Analgesic, Anti-inflammatory, Anti-pyretic, Anti-platelet (reversible)
Variability: may be used in combo with opioids
Black Boxed Warnings (NSAIDs) (3)*
1) Serious adverse cardiovascular thrombotic events (MI, Stroke)
2) GI, ulceration, bleeding, perforation
3) Tx of periop pain for CABG
Morphine
Opioid conversion
10, 30
Tx of Opioid Addiction (3)
1) Methadone
- used for detox, heavily regulated via clinics, 20-120 daily
2) Buprenorphine/Naloxone
- orally for dependence, prevents diversion if injected the nalaxone acts as antagonist
3) Naltrexone
- orally for opioid or alcohol abuse
How do Opioid Agonist Antagonists work
Stimulates one receptor while inhibiting another
(Pentazocine, butorphanol, nalbuphine)
Decreased abuse potential
Kappa agonist, mu partial agonist
Increased AE: anxiety, nightmares, hallucinations
Opioid Considerations for Liver Disease
What are the effects?
So what do you do with dosing?
Increased absorption dt decreased First pass metabolism
Decreased drug clearance
Use lower doses or administer less frequently
Patho of Pain (4) Steps
Stimulation
Transmission
Perception
Modulation
No tolerance Development (3)*
Miosis
Constipation
Seizures
Methodone*
Used for what type of pain?
Chronic
Controlled withdrawal (heroin, opioids)
Fentanyl
How and in what settings is it given in?
IV
ICU/Traumas - bc short half life -> doesn’t accumulate like morphine for and easily titrated
Ketorolac Adverse Events (2)*
Severe bleeding post op
Renal failure monitor: bleeding, liver enzymes, serum Cr
(very effective opiate sparing
COX Inhibition Chart*
Nonselective
Ibuprofen, Naproxen
Decreased CV risk
Increased GI risk
Opioid Antagonists
How do they work?
What are they used for? (3)
Compete with endogenous and exogenous opioids at mu receptors
Acute toxicity, Chronic dependence, Prevention and reversal of Opioid induced SE
Fentanyl*
Metabolism
Metabolized by CYP3A4
Preferred agent in liver failure
Immediate vs Controlled Release considerations
1) Why use controlled release?
2) Passing up controlled release means?
3) Immediate released used for?
1) Increases compliance, convenience, minimizes breakthrough pain
2) Real potential for abuse
3) mild-moderate or breakthrough pain