Gout Flashcards
Diseases That Promote Hyperuricemia
insulin resistance
obesity
hyperlipidemia
hypertension
CHF
CKD
organ transplanation
Hyperuricemic Foods
meat
seafood
beer
soft drinks
fructose
Uricosuric Foods
coffee
dairy
vitamin C
Hyperuricemic Drugs
thiazide & loop diuretics
nicotinic acid
cyclosporine & tacrolimus
levodopa
aspirin
Uricosuric Drugs
losartan
fenofibrate
Gout Flare - Precipitation Factors
alcohol ingestion
high purine ingestion
stress
drugs
Classic Acute Gout - Presentation
monoarticular arthritis
usually joint of lower extremity
Interval Gout - Presentation
asymptomatic period between attacks
Tophaceous Gout - Presentation
deposits of crystals in soft tissues
associated with nerve compression syndromes
Atypical Gout - Presentation
polyarthritis affecting any joint
may be confused with RA or OA
Gouty Nephropathy - Presentation
nephrolithiasis
Acute Gout - Goal of Therapy
reduce pain and duration of attack
Acute Gout - NSAID Mechanism
COX inhibition
Acute Gout - NSAID Options
indomethacin
naproxen
sulindac
NSAIDs - Conditions to Avoid Them In
renal insufficiency
CHF
bleeding disorders
peptic ulcer disease
age 75 or over
Acute Gout - Colchicine Mechanism
inhibition of beta-tubulin polymerization into microtubules
Acute Gout - Colchicine Dose
1.2 mg PO once, then 0.6 mg PO one hour later
Colchicine - Adverse Reactions
GI symptoms
hematologic abnormalities
rhabdomyolysis
Colchicine - DDIs
CYP3A4 inhibitors
P-gp inhibitors
Strong CYP3A4 Inhibitors
darunavir / ritonavir
itraconazole
clarithromycin
ketoconazole
Colchicine - Dose Adjustment with Strong CYP3A4 Inhibitors
acute: 0.6 mg, then 0.3 mg one hour later
prophylactic: 0.3 mg QOD-QD
Moderate CYP3A4 Inhibitors
diltiazem
erythromycin
fluconazole
verapamil
Colchicine - Dose Adjustment with Moderate CYP3A4 Inhibitors
acute: single 1.2 mg dose
prophylactic: 0.3-0.6 mg QD
P-gp Inhibitors
cyclosporine
amiodarone
ranolazine
Colchicine - Dose Adjustment with P-gp Inhibitors
acute: since 0.6 mg dose
prophylactic: 0.3 mg QOD-QD
Colchicine - CIs
concurrent use with P-gp or strong CYP3A4 inhibitors in renal and/or hepatic impairment
Acute Gout - Corticosteroid Mechanism
reduce polymorphonuclear leukocyte migration & suppress the lymph system
Acute Gout - Systemic Corticosteroid Options with Doses
prednisolone 30-35 mg PO QD x 5 days
prednisone 30-60 mg PO QD x 2 days, then taper over 10 days
methylprednisolone dose pack
Acute Gout - Intra-articular Corticosteroid with Doses
triamcinolone
large joint: 40 mg
medium joint: 30 mg
small joint: 10 mg
Acute Gout - Corticosteroid Relative CIs
DM
CHF
severe GERD
severe PUD
Chronic Gout - Goal of Therapy
prevent future attacks
maintain serum uric acid < 6
Chronic Gout - Xanthine Inhibitors
allopurinol
febuxostat
Allopurinol - Adverse Reactions
rash - best to d/c the drug
DRESS - immediately d/c
Allopurinol & Febuxostat - DDIs
warfarin (allopurinol only)
6-MP
azathioprine
theophylline
Allopurinol - Dosing
initial 100 mg PO QD with normal renal function, then increase by 100 mg increments every 2-5 weeks to target < 6 mg/dL
initial 50 mg in CKD 4 or worse
Febuxostat - Dosing
40 mg PO QD
increase to 80 mg PO QD if SUA < 6 not achieved after 2 weeks
Febuxostat - Adverse Reactions
headache
arthralgias
GI symptoms
abnormal LFTs
flushing
BBW: CV events and death
Chronic Gout - Uricosurics
probenecid
Probenecid - Mechanism
competitive inhibition of uric acid at the proximal convoluted tubule, promoting its excretion
Probenecid - Dosing
250 mg BID for 1 week, may increase by 500 mg increments every 4 weeks up to 2 grams per day
Probenecid - Relative CIs
avoid with CrCl < 50
avoid with history of nephrolithiasis
avoid with methotrexate, penicillin, carbapenems, salicylates
Uricase Agents
pegloticase
Pegloticase - Dosing
1.8 mg IV every 2 weeks over 2 hrs
Pegloticase - Adverse Reactions
BBW: infusion-related reactions
anaphylaxis (pre-medicate with steroids and antihistamines)
Chronic Gout Therapy Indications
1 or more SQ tophi and evidence of damage attributable to gout, OR
2 or more flares per year
Chronic Gout Therapy - May Be Considered…
1 attack per year, OR
first flare and CKD 3 or more, UA > 9, urolithiasis
Gout - First-Line Agent
allopurinol
Gout - Monitoring
UA levels every 2-5 weeks
Chronic Gout Therapy - Pegloticase Switch
if all other interventions failed to achieve the goal UA level, and patients have 2 or more flares per year, OR
non-resolving tophi