Pharm II: Block 1 Flashcards
Which neuromuscular blocking agent is the DOC in renal/hepatic Dz?
What neuromuscular blocking agent is metabolized into Laudanosine?
Cisatracurium
Atracurium
Define Acute Pain
Self limiting/nociceptive result from injury
Define Non-Cancer Chronic Pain
Nociceptive, neuropathic or both that impacts daily living and persists greater than 3mon
Define Chronic/Malignant Cancer Pain
Life threatening condition pain w/ multi-modal cause
What are the 5 steps of the pain process?
Transduction- damage creates AP in peripheral nerve
Conduction- AP activates Na channels
Transmission- peripheral to CNS by primary afferent nociceptor
Modulation- reduces transmission via downward projection
Perception- awareness produced by sensory signals
What types of medications stop ascending pain pathways?
What types of medications stop descending inhibitory pathways?
Aspirin, Non-opioid analgesics
Opioid analgesics
Describe the Inflammatory pain process?
Protective and assists w/ healing by discouraging use
Activates immune system
Tenderness promotes repair
Stimulated by Macrophage, Mast, Neutrophil, Granulocytes
What classes of drugs are used to alter the perception of pain in the brain?
Opioids
A2 agonists
TCAs
SSRI/SNRI
What classes of drugs are used to alter the modulation of pain in the descending modulation?
TCAs
SSRI/SNRI
What classes of drugs are used to alter the transmission of pain in the dorsal root ganglion?
What classes of drugs are used to alter the transmission of pain in the peripheral nerve?
LAs, A2 agonists
LAs, Opioids
What classes of drugs are used to alter the transduction of pain in the peripheral nerve?
LAs Capsaicin Anticonvulsant NSAIDs ASA Acetaminophen Nitrate
What 5 classes of drugs can be used as adjuvant agents to reduce opioid burden?
TCAs- Amit, Nortri, Desipramine SSRI/SNRI- Dulox, Venlafax, Milnaciparn Anticonvulsant- Gaba, Pregaba Local anesthetic- Lidocaine Counter irritant- Capsaicin
Where are COX 1, 2 and 3 most commonly found?
COX-1= platelets, stomach and endothelium COX-2= inflammatory cells and kidneys COX-3= CNS (thermoregulatory control)
What are the undesireable and desired effects of COX-1 and COX-2 inhibition?
COX 1= Undesired= gastrotoxicity, Desired= antithrombic
COX-2= Undesired= HTN, Na retention, prothrombotic, Desired= anti-inflammatory, analgesic
What is the primary route of Acetaminophen metabolism?
What is the secondary route and what is adversely formed?
Glucuronidation and Sulfation to renal
3A4, 2E1, N-hydroxylation
Produces NAPQI- normally combined w/ glutathione and excreted renally
What three types of PTs/scenarios are at an increased risk of forming NAPQI?
Supratherapeutic doses (+4gm/24hrs)
Heavy alcohol/liver Dz (>3 drinks/day)
Malnutrition/Fasting
What are the three phases of an acetaminophen OD?
First 24hrs- GI Sxs, N/V
24-72- abd pain, liver tenderness, inc transaminase, decreased urine, jaundice
4 - 14 days- resolution or liver failure to death
What is the antidote to an Acetaminophen OD?
Charcoal regardless of lab wait times
N-acetylcysteine- metabolizes acetaminophen to cysteine which is glutathione precursor
Acetadote- injectable
Mucomyst- inhalation
N-Acetylecysteine is used in PTs w/ probable hepatotoxicity in what scenarios?
Single ingestion 150mg/kg or 7.5g total regardless of weight
Unknown ingestion time and >10mcg/mL
Hx of APAP ingestion and any evidence of liver injury
PTs w/ delayed +24hrs presentation w/ lab evidence of liver injury
What’s the max dose of acetaminophen per day?
Adults- max 3gm/day Elderly- <2gm/day Acetaminophen/opioid combo- 325mg/pill Infants/Children- 160mg/5ml Children Melt Away- 80mg Children- 10-15mg/kg/dose Q4-6
What is Aspirin’s effect on platelets?
What are the external uses of aspirin?
Anti-platelet due to irreversible COX inhibition
Salicyclic acid- acne, corns, callus, warts
Methyl salicylate- arthritis, sports rubs
As selectivity for COX 1 increases ? changes?
As selectivity for COX 2 increases ? changes?
Platelet aggregation is more prominent
Beneficial effects of platelet aggregation decrease, more CV risk
What is the list/precedence of treatment for PTs w/ CV Dz needing pain control?
Acetaminophen Aspirin Tramadol Opioids- short term Non-acetylated salicylates NSAIDS w/ low COX 2 selectivity NSAIDS w/ some COX 2 selectivity COX 2 selective agents
What type of PTs are at high risk of developing ulcers from NSAIDS?
Which ones are at moderate risk?
High- Hx of complicated ulcer
Mod- +65y/o, high dose NSAID, uncomplicated ulcer Hx, concurrent use of aspirin, corticosteroids, or anticoagulatns
PTs w/ low, moderate or high CV and/or GI ulcer risks receive what treatment regiments?
High CV, High ulcer= only alternative therapy
High CV, mod/low ulcer= Naproxen and PPI/Misoprostol
Low CV, High ulcer= alternative therapy or COX-2 inhibitor and PPI/Misoprostol
Low CV, Moderate ulcer= NSAID and PPI/Misoprostol
Low CV risk, Low ulcer= NSAID only at lowest effective dose
What are the 3 phases of Salicylate Toxicity?
1- N/V, tachypnea, HA, tinnitus; <150mg/kg
2- metabolic acidosis, respiratory compensation; 150-300mg/kg
3- sever K and BiCarb depletion, dehydrated, metabolic acidosis/respiratory compensation; >300mg/kg
How is Salicylate Toxicity treated?
No antidote Primary treatment= replenish BiCarb Activated charcoal and lavage O2 and E+ Glucose if AMS despite glucose levels Start dialysis
What are the pros and cons of using non-acetylated salicylates?
Effective anti-inflammatory Effective analgesics Less effect on platelets Lower GI bleeds Less renal toxicity
Con- less analgesic effect than aspirin
When is the use of non-acetylated salicylates preferred?
COX-1 inhibition needs to be avoided
PTs w/ asthma
Thrombocytopenia
Renal dysfunction
What are the uses and contraindications of using Ketorolac?
Decreases opioid requirement by 25-50% when treating mild-mod pain for less than 5 days
Cataract extraction, refractive surgery, ocular itching from allergic conjunctivitis
Don’t use in peds PTs, bleeding risk, w/ NSAIDS, renal impairment, Delivery
PBNDR
What is the max amount of Ibuprofen for adults and kids per day?
3200mg
2400mg
What effects do prostaglandins have in the eyes?
Meiosis
Increased vascular permeability in blood-ocular barrier
Pressure changes
What are the three ocular NSAIDS and their uses?
Flurbiprofen- inhibits operative meiosis
Diclofenac- post-op inflammation and photophobia
Keterolac- ocular itching and post-op inflammation
What type of NSAID is best for PTs w/ renal insufficiency?
Which one has the least CV events?
Which one has the lowest GI bleeds?
Non-Acetylated salicylates
Naproxen
Celecoxib
What effect do endogenous opioid peptides have on opioid receptors?
Opioid receptors= GPCRs
Peptides bind and inhibit adenylyl cyclase by controlling ion gating
What does a decreased amount of Ca2 influx in the presynaptic cleft do to pain?
Inhibits nociceptive input from periphery to spine
Activates descending inhibitory paths
Alters limbic activation
What medications inhibit the ascending pain pathway from nociceptors?
What medications inhibits the descending pain pathway?
Aspirin and non-opioids
Opioid analgesics
What are Mu, K, D and K receptors and their location?
Mu- most analgesic properties; U1- analgesia, U2- respiratory depression, sedation, euphoria
K- contribute to analgesic properties
D- located peripherally and selective for enkephalins
Opioid receptors are located in what three areas of the body?
CNS
Peripheral nerves
GI tract
Functions of Mu receptors
Supra/spinal analgesia, sedation, inhibits respiration, slowed GI motility, modulates hormone/neurotransmitter release
Functions of D receptors
Supra/spinal analgesia
Modulates hormone/neurotransmitter release
Function of K receptors
Supra/spinal analgesia
Psychotomimetic effects
Slows GI transit
Define Physical Dependence
Define Addiction
PTs use of drug is required for well being
Loss of control over drug use
Define Pseudo-Addiction
Under treatment of chronic pain leading to addiction-like behavior
What are the S/Sxs of opioid withdrawal?
CACAIN Anxiety Irritability N/V/D Chills, aches, cramps
CNS excitation from opioids is from the stimulation of ? receptor?
The use of ? drug can cause myoclonus/seizure like activity in renal failure PTs
Kappa- causes dysphoria
Meperidine- Demerol
What side effect to opioid use does not go away with tolerance/continued use?
What can be used for the adverse nausea effect of opioids?
Miosis, constipation
Corticosteroid
Antihistamine,
Metoclopramide
Serotonin antagonist
What three opioids are most likely to cause allergic reactions?
What two have fewer histamine related reactions?
Codeine, Morhpine, Meperidine
Oxy, Fentanyl
What are the Sxs of Opioid Allergy
What are the Sxs of Pseudoallergy and what drug is most likely to cause it
IgE/T-Cell induced hives, rash, erythema, HOTN, bronchospasm, angioedema
Flush, Itch, Sweats, Hives, HTON
Morphine
What are Sxs of opioid toxicity?
Confusion, Hallucinations, Agitation, Respiratory depression, Dreams
Caution is needed when using opioids for ?
Pure with weak agonists Head injuries Pregnancy Pulmonary, liver, renal impairments Endocrine dz
What is the most common used opioid used as prescription to suppressive the cough center of the brain?
What is the OTC derivative of this drug?
Codeine
Dextromethorphan
What is the least lipophilic of the common opioids prescribed?
Morphine- small amount crosses BBB and will cross placenta
What two drugs can be given if PT has adverse reactions to morphine?
Diphenhydramine
Hydroxyzine
How are the pharmacokinetics of Hydromorphone better than morphine?
Can all providers prescribe hydromorphone?
Better PO absorption, more fat soluble
Extended release is REMS drug, requires training Q2yrs
What is the sequence of best to worse binding affinity of morphine and it’s derivatives?
Hydromorphone
Morphine
Hydrocodone
What is Oxycodone metabolized into?
What is so special about polyethylene oxide form of oxy?
Noroxycodone and oxymorphone
Turns gummy when contacts w/ water
What are the adverse effects of mixed opioid ant/agonists?
Psychomimetic response
Precipitates withdrawal
Ceiling effect on respiratory/analgesic
Lower abuse potential
When are Fentanyl patches indicated for use?
Severe chronic pain PTs w/ opioid tolerance of +1wk on: >60mg Morphine/day >30mg PO Oxycodone/day >8mg PO Hydromorphone/day
Characteristics of the Fentanyl derivatives Alf/Suf/Remifentanil?
All three share what characteristics?
Alf- rapid onset/short duration
Suf- slower onset than Fentanyl but lasts same time
Remi- rapid onset but shortest duration, ONLY available by infusion
No infusion accumulation
What drug is classified as a Diphenylheptane?
What two drugs are classified as Benzomorphans?
Methadone
Pentazocine and Dipenoxylate
What types of PTs can not receive Tapentadol?
In order for Naloxone to have a systemic effect in can’t be taken through what route and but when it is, what for?
Renal dysfunction
Not systemic if PO- opioid induced constipation
Consider giving Naloxone to what PTs?
Hx of Intox/OD Suspected Hx of abuse/non-medical use Methadone/Buprenorphine use d/o >50mg of PO morphine or equivalent Rotated from one opioid to another Smoke, Respiratory, Hepatic, Renal, Heart, Alcohol, Benzo, Sedative, Anti-Depressants
When should Naloxone be given to a suspected OD PT?
Respiratory/CNS depression Pinpoint pupils in difficult to arouse PT Cyanosis Death rattle Bradycardia/HOTN
What is the MOA of Naltexone
What is it used for?
Mu competitive antagonist that competes but doesn’t displace opioids
Longer duration for opioid/alcohol dependence
What is the sequence of most hydrophilic to most lipophilic opioids?
Morphine Oxycodone Oxymorphone Hydromorphone Methadone Fentanyl
What are the two combo forms of Naltrexone and their use?
What are the contraindications for using Naltrexone
Morphine- post-op pain w/out abuse potential
Buproprion- weight management
Opioid analgesic
PT w/ pos UA
Why are TCAs are used in pain management and which ones are used?
Block reuptake of 5HT and NE
Amitriptyline- off label
Nortriptyline
Desipramine
Why are SSRIs/SNRIs used in pain management and which ones are used?
Block reuptake of 5HT and NE
Duloxetine- DM neuropathy, Fibromyalgia
Milnacipran- Fibromyalgia
Vanlafaxine- Neuropathic pain
Why are anti-convulsants used in pain management and which ones are used?
Decreases neuron excitability
Gabapentin- Post-Herpetic neuralgia, Neuropathic pain
Pregabalin- Diabetic neuropathy, Fibromyalgia, Post-herpatic Neuralgia
Why are local anesthetics used in pain managements and which ones are used?
Why are counter irritants used?
Lidocaine 5%: post-herpetic neualgia, Allodynia
Deplete substance P
Non-addicted opioid PTs should be tapered off by how much/how quickly?
How long of a taper do PTs taking opioids PRN need?
20-50% of original dose
None
What are reasons to change opioids?
Lack of response
Adverse effects
Change in PT status- dysphagia
Cost/personal preference
What is the gold-standard opioid?
For PTs taking long acting opioids, short acting meds should be given for break through pain and at ? dosage?
Morphine
10-15% of TDD Q1-2hrs
Define Primary HAs
Define Secondary HAs
Migraine, Tension, Cluster, Other (cough, exertion)
Head/neck trauma, Cranial/cervical vascular d/o, Infection, Psych d/o
What are the unique characteristics of migraines?
Usually unilateral Pulsating and aggravated w/ activity Nausea Photo/Phono phobia 4-72hrs
What are the unique characteristics of tension HAs?
Bilateral Pressing/Tightening that doesn't worsen w/ activity No nausea Rare photo/phonophobia Minutes-days
What are the unique characteristics of cluster HAs?
Men
Boring/Piercing that causes PT to be restless/agitated during episode
Ipsilateral Sxs
Occur frequently and last 15m-3hrs
What does the “SNOOP” acronym for finding secondary HAs stand for?
What does “POUND” acronym stand for when searching for migraines?
Systemic Neurologic Onset (sudden) Onset (late)
Pattern
Pulsatile, One-day, Unilateral, N/V, Disabling
When/why does a provider go SNOOPing for HA causes?
Acute onset of 1st/worst in life HA w/ meningitis Sxs Inc SBP +210 or DPB +120 Dec pulse/tender temporal artery Pain worse w/ laying down
What are the Dx criteria for a migraine w/out an aura?
5 attacks
Last 4-72hrs
2 of: unilateral, pulsating, intensity, aggravated by activity causing avoidance
1 of: N/V/both, photo/phono phobia
What are the Dx criteria for a migraine w/ an aura?
2 attacks
One aura Sxs: visual, sensory, speech, motor, brain stem, retinal
Two of: one aura Sx spreads over 5min or two Sxs occur in succession; Aura Sxs last 5-60min; Each aura Sx lasts 5-60min; One Sx is unilateral, Aur followed by HA in 60min
More than 50% of migraines are genetically caused by ?
Familial hemiplegic migraines- mutations in CACNL1A4 genes on Chromosome 19
Why is 5HT an important mediator of migraines?
Stimulation- triptans
Antagonizers- methysergides
Prevent uptake/release- CCBs
Inhibit serotogenic raphae neurons- Valproate
Pain from migraines originates from ?
Trigeminovascular system- regulated by serotonin neurons; activation causes release of vasoactive neuropeptides CGRP, Substance P and Neurokinan A that cause vasodilation and dural plasma extravasation which leads to inflammation
What are the 4 Phases of Migraine HAs?
1 Premonitory Sxs- hrs to day before onset, most commonly neurologic Sxs, psychosocial, autonmic or constitutional Sxs
2 Aura- Pos or Neg (most common) sensory or motor Sxs that precede the HA by 60min
3 HA- usually early morning or upon waking, most w/ nausea
4 Resolution- fatigue, mood, tender scalp and impaired concentration
How are migraine HAs cared for across attacks?
HA 1-3: Tx w/ NSAID
Unresponsive Tx in 2 or more HAs= 4th HA Tx w/ triptan
Caution for Serotonin Syndrome
How are migraine HAs cared for during attacks?
How is migraine care stratified?
HA Tx w/ NSAID, no response in 2hrs= Tx w/ triptan
HA Dx MIDAS Grade 2= Tx w/ NSAID
HA Dx MIDAS Grade 3-4= Tx w/ triptan
When treating migraines across, within or stratified across attacks, how is “successful response” defined?
Pain reduced from 3-4 down to 0-1
What are the Non-Specific, Specific and Miscellaneous acute migraine agents?
Non-Specific: analgesics, NSAIDs
Specific: Ergotamines, Triptains
Misc.: Butorphanol nasal spray, Anti-emetic (metoclopramide)
What may be a useful FIRST choice drug for acute migraines in PTs w/ mild-mod attacks or can’t take NSAIDs or ASA?
Acetaminophen, consider w/ caffeine
Inferior pain free response to other NSAIDs and ASA
What is the MOA of Butalbital in Fioricet and Fiorinal
Short acting barbiturate
APAP/Butalbital/Caffeine- not scheduled
ASA/Butalbital/Caffeine- scheduled
What is the DOC for mild/mod migraine attacks?
How long should use of this drug be limited to?
NSAIDs- Ibuprofen, Naproxen, Excedrin
Contra to NSAID: Acetaminophen (not for gastritis, ulcer, renal dz, bleeding d/o)
Less than 15 days/mon
Ergotamine must be given with ?
What are the adverse effects?
Caffeine and rectally
Constriction leading to vascular ischemia, gangrene, tonic-clonic convulsion and mania/hallucinations
What are the administration considerations for Ergotamine?
Pre-treat w/ antiemetic and start at first sign of attack
Rectal better tolerated than PO but less effective than triptans
When is the use of Dihydroergotamine a reasonable choice for HA management?
Mod-severe HA and NSAID trial/non-opioid analgesic fails
IV w/ anti-emetic for PTs w/ severe migraines
Overall preferable over Ergotamine
What 3 Triptans have the highest likelihood of consitent success?
Which two are slower and have lower efficacy?
Major side effect?
Riza, Ele, Almo (Ele has best short term/sustained benefit)
Nara, Frova
Serotonin Synd.
What are the advantages of Sumatriptan and Zolmitriptan?
When is nasal spray form more useful?
Number of dosing formulas
Faster onset and more useful for PTs w/ vomiting
9 days or less/mon
What is unique about the first dose of a Triptan?
Done in clinic w/ EKG w/ VS on PTs that are suspected to have CAD (HTN, hypercholesterol, obese, diabetic, smoker)
What is the clinical triad of Serotonin Syndrome?
Cognitive, Neuromuscular/Autonomic dysfunction
D/c offender
Benzos- anxiety/seizure
Cooling blankets for hyperthermia
Cyproheptadine- 1st gen anti-histamine
Name the 7 applicable Triptans and related comments
Almo- Sulfa group, dec dose w/ 3A4 inhibs, desmethyl metabolite
Ele- not metabolized by MAO, don’t use w/in 72hrs 3A4 inhibitors
Frova- not metabolized by MAO
Nara- not metabolized by MAO
Riza- dec dose by 5mg if PT is taking Propanolol
Suma
Zolmi- desmethyl metabolite w 2/3 potency of parent form
What anti-emetics are used during migraines?
Metoclopramide- most efficacious for N/V from migraine; significant EPS s/e
Anti-Psychotics- dopamine/serotonin antagonists (Chlorpromazine, Prochlorperazine)
5HT3 Antagonists- not efficacious, high adverse HA (Ondansetron, Granisetron)
What are the most, intermediate and least efficacious meds for migraine treatment?
Most- Aspirin, Excedrin, Ibuprofen, Triptan
Intermediate- Acetaminophen, Naproxen, Midrin, Butorphanol, Ergotamine, DHE + anti-emetic
Least- Fioricet/Fiorinal
Medication Overuse HA are AKA ?
How are they best avoided?
Analgesic Rebound HA from daily analgesic/triptans that cause 5HT down regulation
Limit migraine therapies to 2 days/wk
What are the criteria for migraine prophylaxis?
How long does it take to assess efficacy?
+4 HA/mon or duration >12hrs
1-2mon
What are the first line migraine prophylactics for pattern, heart, depression/insomnia or seizure/MD PTs?
Predictable- NSAID at time of HA
HTN/Angina/Anxiety- BB (Verapamil if BB contraindicated)
Depressed/Insomnia- TCA
Seizure/Manic Depressive- anticonvulsant
Which anti-convulsants can be used for migraine prophylaxis?
Divalproex- N/V, Asthenia, Weight gain, Hair loss, Tremor, Liver Dz, Preg Cat D, less GI than Valproate
Valproate- kidney stones, N/V, Asthenia, Weight gain, Hair loss, Tremor, Liver Dz, Preg Cat D
Topiramate- Kidney stones, Parasthesia, Weight loss, Metabolic acidosis, Sedation, Altered taste, Cleft lip/palate
What Triptans are used for migraine prophylaxis?
Frova, Zolmi, Nara
Contraindicated in PTs w/ ischemic heart dz, uncontrolled HTN, CV dz
Naratriptan is best used for ? types of migraines?
Short term prevention from menstrual associated migraine
Which BBs are used for migraine prophylaxis?
Propan, Tim, Aten, Meto
Fatigue, Tired, Dizzy, Impotence, No for Asthma PTs, Raynauds, caution w/ diabetic, may worsen depression
T/A/M- not first line BBs but may be sued w/ other therapies for PTs w/ anxiety, HTN or angina.
What CCBs are used for migraine prophylaxis?
Which NSAID can be used?
Verapamil
S/e= constipation, HOTN, bradycardia, worsening CHF
may not be seen for 8wks
Naproxen- Prevent predictable HAs
When is Botox A considered for migraines?
Why is Mg considered for phrophylaxis?
PTs w/ +15 HA days/mon or lasting +4hrs
Pregnancy
What is the most common type of primary HA?
Tension- pain originates from myofascical factors and peripheral sensitization of nociceptors
What are the pharmaceuticals of choice for tension HAs?
DOC- Acetaminophen, NSAIDs
Limit use to 9 days or less/mon
Muscle relaxants
When is prophylaxis considered for tension HAs?
What med is used?
+2/wk, +3hrs, disabliing
DOC- Amitriptyline @ bedtime
Adverse- Anti-Ach, Weight gain, OHOTN, Arrhythmias
What is the suspected cause of cluster HAs?
Hypothalamic dysfunction- altered circadian rhythms
Lab reports of abnormal melatonin, GH, testosterone and prolactin
What type of HA is the most severe of the primary HAs?
How is their presentation different than migraine PTs?
Cluster- occur at night, spring/fall w/ ipsilateral Sxs
PTs sit and rock or pace holding head
What is the criteria for cluster HAs?
5 attacks lasting 15-180min
Attack occurs w/ ipsilateral Sx