Week 7: Gout, Osteoarthritis, Rheumatoid Arthritis, SLE Flashcards
(163 cards)
Gout
most common form of inflammatory arthritis
“disease of kings
Gout epidemiology
increased age=increased risk
3-4:1 male: female
(female risk increases w. age w. estrogen loss
linked to:
comorbid conditions
diet
medication use
renal erate transporter gentotype (SLC2A9, ABCG2, SLC17A3, SLC22A12)
Patho of gout
purines (diet, tissue breakdown)-> uric acid (metabolized by uricase in most mammals, not humans)->metabolized to allantoin and excreted from body
UA soluble at conc <6.7 mg/dL
saturation causes crystallization into joints
phagocytosed triggering an immune respone
excess serum uric acis caused by
*overperoduction of urate
or underexcretion of urate
gout and disease states
DM
HLD
obseity
renal insufficiency/CKD
HTN
organ transplantation
CHF
FOOD AND GOUT
hyperuricemic
*meat
seafood
beer and liquor
soft drinks
fructose
Uricosuric (increase uric acid excretion in urine)
*coffee
dair
vitamin C
meds and gout
hyperuricemic meds
*THIAZIDES
LOOP DIURETICS
NICOTONIC ACID
ASPIRIN (<1G/DAY)
others..
cyclosporine
tacrolimus
pyrazinamide
levadopa
ethambutol
uricosuric meds
LOSARTAN
FENOFIBRATE
classic GOUT PRESENTATION
overall characteristic of flares:
common areas affected:
can be precipitated by:
presentation waxes and wanes . periods of asymptomatic until pt experiences acute gout attack
gout flare: (attack): onset within 24 of severe pain, erythema and swelling in a single or multiple joints
Podagro: first metacarsopholangeal joint (big toe) joint involvement most common
may calso effect ankles, fingers, wrists and elbows
can be precipitated by
alcohol ingestion
high purine ingestine
stress
meds (including UA lowering agents
other clinical presentations of gout
classic gout: monarticular arthritis, frquently attacks first metatarsalpholangeal join, although other joints of lower extremeitie are also frquently involved. affected joint i swollen, erythamatous, and tender
interval gout: asymptomatic period inbetween attacks
tophaceous gout: deposit of urate crystalls in soft tissues, . complications include soft tissue damage, deformity, joiint destruction, and nerve compression syndromes such as carpal tunnel syndrome
atypical gout: polyarthritis affecting any join upper or lower extremity. may be confused with rheumatoid or osteoarthritis
gout nephropathy: nephrolithiasis . acut and CKD
what is a tophi
mass of urate deposits in bone, cartilage, joints or tissues
gout dx
dx by synovial fluid aspiration and identification of monosodium urate crystals
* not routinely performed
!!Flare/ attack presentation along w. serum acid>6.8 mg/dL indicated treatment for gout!!
**note. elevated serum uric acid levels alone w. no presentation of gout symptoms does not warrant gout treatment
Goals of therapy for acute gout
reduce pain and duration of attacks
geenral anti-inflammatory agents for acute gout treatment
NSAIDS
colchcine
corticosteroids (oral or intrarticular)
General Acute Gout pharmacotherapy
NSAIDS
moa:
examples:
dosage:
General Acute Gout pharmacotherapy
moa:cox INHIBITION
examples: Indomethacin, naproxen, and sulindac have fda approved indications for gout (but any nsaid will do for the most part)
dosage: –
nsaid considerations for use in acute gout
timing:
when to avoid use:
timing of admin (<24 hrs) more important to treatment success than choice of agent
resolution of symptoms usually within 5-8 days
(may require treatment beyond 7 days)
AVOIDE USE IN:
*renal insufficiency/ failure
*bleeding disorder/anticoagulated pts
*peptic ulcer disease
*CHF
*older adult (>75)
General Acute Gout pharmacotherapy
Colchicine
moa:
examples:
dosage:
General Acute Gout pharmacotherapy
moa: inhibitoin og b-tubulin polymerization into microtubules, causing downregulation of inflammatory patways (also prevents activayion, degranulation and migration of neutrophils
examples:–
dosage:
1.2 mg (2 tabs) po x 1 then 0.6 mg 1 hr later
*may have to continue beyond this dosage w. colchicine or additional therapy
Considerations/pearls for colchicine
often causes GI symptoms
can cause:
*hematologic abnormalities
*rhabdomylisys
a) renal dysfunction and elderly patients are at increased risk
b)concaminant use of 3a4 inhibitors, pgp inhibitors, fibrates, and statin may increase risk of myopathy
Dose adjustment for..
*Crcl< 30mL/min
*severe hepatic impairment (no recommendations. if being used, reduce dose)
DDI: concaminant cyp3a4 and pgp inhibitor users
*dose adjustments necessary (for prophylactic users too)
do not dose colchicine for flare therapy if using prophylaxis
*concurrent use of colchicine and pgp or strong cyp3a4 inhibitors is CI in renal or hepatic impairment (fatal toxicities reported)
Colchicine DDI
DDI mechanism: Strong CYP3A4 inhibitors
examples:
dose adjustments:
*acute gout flare:
*ppx gout flare:
Colchicine DDI
DDI mechanism: Strong CYP3A4 inhibitors
examples: CLARITHROMYCIN, ITROCONAZOLE, KETOCONAZOLE, DARUNAVIR/RITONAVIR, atazanavir, nefazodone, lopinavir/ritonavir
dose adjustments:
*acute gout flare: single 0.6 mg dose followed by 0.3 mg 1 hr later dose to be repeated no earlier than 3 days
*ppx gout flare: 0.3 mg once qod to 0.3 mg once daily
Colchicine DDI
DDI mechanism: Moderate CYP3A4 inhibitors
examples:
dose adjustments:
*acute gout flare:
*ppx gout flare:
Colchicine DDI
DDI mechanism: Moderate CYP3A4 inhibitors
examples: VERAPAMIL, DILTIAZEM, ERYTHROMYCIN, FLUCONAZOLE, aprepitant, amprenavir
dose adjustments:
*acute gout flare: 1.2 mg dose; dose to be repeated no earlier than 3 days
*ppx gout flare: 0.3-0.6 mg daily (0.6 mg dose may be given as 0.3 mg twice daily)
Colchicine DDI
DDI mechanism: PGP inhibitors
examples:
dose adjustments:
*acute gout flare:
*ppx gout flare:
Colchicine DDI
DDI mechanism: PGP inhibitors
examples: CYCLOSPORINE, AMIODARONE, RANAZOLINE
dose adjustments:
*acute gout flare: single 0.6 mg dose; dose to be repeated no earlier than 3 days
*ppx gout flare: 0.3 mg once qod to 0.3 mg once daily
General Acute Gout pharmacotherapy
Coticosteroids
moa:
examples:
dosage:
General Acute Gout pharmacotherapy
Coticosteroids
moa: reduces polymorphnuclear leukocyte migration, supress the lymph system
*immune supression and anti-inflammatory effects
examples:prednisolone, prednisone, methylprednisolone, intra-articular triamcinolone
dosage:
*prednisolone 30-35 mg po x5days
*prednisone 30-60 mg po qd for 2 days with taper over 10 days
*intrarticualar triamcinolone:
a) large joint (knee):40 mg as a single dose
b)medium joint (eg wrist, ankle, elbow): 30 mg as a single dose
c) small joint (eg toe, finger): 10 mg as a single dose
corticosteroids considerations for acute gout flare
*if only one or two joints are involved, either IA or oral are recommended
if ana attack i polyarticular, systemic therapy is indicated
consider alternaive if dm, chf OR SEVERE gerd OR pud
Safe for use in renal impairment
AE (with short term use): leukocytosis, increases appetite, modd changes, elevated BG
Chronic therapy of gout goal
prevent future attacks and hyperuricemic sequelae by maintainging SUA <6.0
*prevent arthropathy, tophus frmation, nephrolithiasis, joint damage
General Chronic Gout pharmacotherapy classes and examples
Xanthine Oxidase Inhibitors
*Allopurnol
*Febuxistat
Uricosurics
*probenacid
Pegloticase
General Chronic Gout pharmacotherapy
Allopurinol
moa:
dosage:
AE:
DDI:
Considerations:
General Chronic Gout pharmacotherapy
moa: Xanthine oxidase inhibitor. blocks conversion of hypoxanthine to xanthine to uric acide
dosage:
starting: 50-100 mg qday
*100 mg po qd starting for normal renal function
*50 mg po qd in CKD stage 4 or worse
*increase q2-5 weeks to target <6 mg/dL
*may have to increase up to 800 mg to achieve target SUA
*can go above 300 mg po qday even in renal impairment depsite renal dosage adjustment PI recommendations
ae:
*rash:~2%. increased with coad w. amoxacillin, ampicillin, thiazides, ace-i. Prob best to d/c drug. mild rash can progress to SJS
*DRESS
*occurs in 0.1 pts
IMMEDIATELY d/c
DDI:
*warfarin (increases risk of bleeding)
*6-MP, azathioprine, theophylline (allopurinol can icnrease levels of these
*amaxaillin, ampicillin, thiazides, ace-i increase risk of rash
considerations:
*1st line therapy
*can be used overproducers or underexcreters of uric acid