Pain Flashcards
Acetaminophen ceiling effect at what dose
1000 mg
Acetaminophen routes of administration
Po pr iv
Acetaminophen drug interactions
Increase inr with warfarin if over 2 g per day
Acetaminophen toxicities
Hepatotoxicity
Nsaids toxicities
Peptic ulcer Renal dysfunction Cv effects Cns effects Htn Skin rash Mild hepatotoxicity
Nsaids drug interactions
Anticoags- increase bleeding risk
Ace or arb- worsens renal impairment
Adverse effects of opioids common
Euphoria drowsinesS N/v Decreased respiratory rate Constipation Pruritus
Less common aes of opioids
Myoclonus Seizures Hallucinations Confusion Sexual dysfunction Sleep disturbances Dyspepsia
Cis and precautions to opioids
Respiratory diseases Renal impairment Hepatic impairment Paralytic ileus Other meds with cns suppressant effects (avoid with maois)
What drugs are morphine like
Morphine (roxanol, msir, avinza, kadian, ms contin)
Hydromorphone (dilaudid, exalgo)
Oxycodone (oxy ir, eth-oxydose, roxicodone, oxycontin, percocet, tylox)
Oxymorphone (opana)
Codiene
Hydrocodone (vicodin, vicoprophen, lortab, norco, rezira, zutripro)
Which opioids have active metabolites
Morphine codeine and meperidine
Morphine dose adjustments
Renal
Morphine dose range
10-200. No ceiling.
Morphine dosage forms
Ir and er po Oral solution Iv Im Pr
Dosage forms of hydromorphone
Ir po Oral solution Iv Im Subq Intrathecal Pr
Dose range of hydromorphone
1-16 mg
Hydromorphone potentcy related to morphine
More potent but shorter acting
Oxycodone potency compared to morphine
Slighty more potent but longer acting
Available forms of oxycodone
Ir and er po. Oral solution and combo products
Dose range of oxycodone
1.5-80 mg
Oxycodone metabolized y which cyps
3a4 and 2d6
Oxymorphone available dosage forms
Ir and er po
Injectable
Pr counselig for oxymorphone
Take one hour before or two hours after meals. Enhanced absoption with food
Codeine potentcy compared to morphine
Much less potent
Codeine cyp enzyme
2d6
Codeines antitussive moa
Supresses reflex at cough center on medulla
Hydrocodone potentcy compared to morphine
Similar
Hydrocodone cyps
3a4 ad 2d6
Hydrocodone availability
Er po
Combo products
Drugs categorized as meperidine like
Meperidine
Fentanyl
Meperidine dosage forms
Im
Po
Subq
Dose adjustment for meperidine
In renal failure
Toxicitiea of meperidine
Lower seizure threshold
Cns toxicities
American pain society recommendation for meperidine
Less than 48 hours at doses less than 600 mg in 24 hours
Meperidine used for what not pain
Rigors and shivering
Fentanyl dosage forms
Transmucosal
Transdermal
Im
Iv
Fentanyl cyp interactions
3a4 inhibitors
Fentanyl dose range
100 to 1600 mcg
Transmucosal ir fentanyl indication
Acite breakthrough cancer pain
Fentanyl patch indication
Chronic pain in opioid tolerant
Cautions with fentanyl patch
Morbidly obese or cachectic
Exposure to heat
Opioids with rems
Er formulations and fentanyl ir transmucosal products
Methadone available formulations
Injectable and oral (long acting oral)
Blackbox of methadone
Qtc prolongation
Methadone drug interactions
Serontinin and norepinephrine inhibition 3a4 2b6 2c9 2c19 2d6
Pain definition
An unpleasant sensory and emotional experience associated with actual of potential tissue damage, or described in terms of such damage
Allodynia definition
Pain due to a stimulus that does not normally provoke pain
analgesia definition
absence of pain in response to stimulation which would normally be painful
Anesthesia dolorsa definition
pain in an area or region which is anesthetic
Causalgia definition
a syndrome of sustained burning pain, allodynia, and hyperpathia after a traumatic nerve lesion, often combined with vasomotor and sudomotor dysfunction and later trophic changes
Dysesthesia definition
an unpleasant abnormal sensation, whether spontaneous or evoked
Hyperalgesia definition
increased pain from a stimulus that normally provokes pain
Hyperesthesia definition
increased sensitivity to stimulation, excluding the special senses
Hyperpathia
A painful syndrome characterized by an abnormally painful reaction to a stimulus, especially a repetitive stimulus, as well as an increased threshold
hypoalgesia
diminished pain in response to a normally painful stimulus
hypoesthesia
decreased sensitivity to stimulation, excluding the special senses
Neuralgia
pain in the distribution of a nerve or nerves
neuritis
inflammation of a nerve or nerves
Neuropathic pain
pain caused by a lesion or disease of the somatosensory nervous system
central neuropathic pain
pain caused by a lesion or disease of the central somatosensory nervous system
Peripheral neuropathic pain
pain caused by a lesion or disease of the peripheral somatosensory nervous system
neuropathy
a disturbance of function or pathological change in a nerve;
nociception
the neural process of encoding noxious stimuli
nociceptive neuron
a central or peripheral neuron of the somatosensory nervous system that is capable of encoding noxious stimuli
nociceptive pain
pain that arises from actual or threatened damage to non-neural tissue and is due to activation of nociceptors
Noxious stimulus
a stimulus that is damaging or threatens damage to normal tissues
pain threshold
the minimum pain intensity of a stimulus that is perceived as painful
Pain tolerance level
the maximum intensity of a pain-producing stimulus that a subject is willing to accept in a given situation
Paresthesia
an abnormal sensation, whether spontaneous or evoked
sensitization
increased responsiveness of nociceptive neurons to their normal input, and/or recruitment of a response to normally subthreshold inputs
Central sensitization
increased responsiveness of nociceptive neurons in the central nervous system to their normal or subthreshold afferent input
peripheral sensitization
increased responsiveness and reduced threshold of nociceptive neurons in the periphery to the stimulation of their receptive fields
non pharm for pain
TENS psychological intervention cold/heat massage prayer/meditation distraction exercise music
treatment goals of chronic pain
keep patient functional
improve mental health
decrease pain preception and dependence on drug therapy
decrease rate of physical deterioration
reduce pain as much as possible without undue aes
acute pain treatment goals
reduction of pain to acceptable levels
facilitate recovery from underlying disease
Who step 1 treatment option
non-opiod +/- adjuvant
WHO step 2 treatment options
opiod for mild to moderate pain ATC
+/- non-opioid
+/- adjuvent
WHO step 3 treatment options
Opioid for moderate to severe pain
+/- non-opioid
+/- adjuvent