(monosodium urate crystal deposition disease-prevalence of Gout approximately 0.2% -hyperuricemia...
Transcript of (monosodium urate crystal deposition disease-prevalence of Gout approximately 0.2% -hyperuricemia...
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Copyright © 1972-2004 American College of Rheumatology Slide Collection. All rights reserved.
Gout
(monosodium urate crystal deposition disease)
Is an inflammatory arthritis associated with hyperuricemia.
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“The Gout” by James Gilray, 1799. Gout
depicted as an evil demon attacking a toe.
Gout, Latin: gutta, a drop
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-Epidemiology
-prevalence of Gout approximately 0.2%
-hyperuricemia occurs in about 5%
-Men: women 10:1
-rarely before young adulthood
-Seldom premenopausal females
-Most people with hyperuricemia are asymptomatic
-Serum uric acid levels increase with
-Age –obesity –high protein diet
-Highalcohol consumption
-Combined hyper lipidaemia . D.M .I.H.D -and hypertension
-Family History of Gout .
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Pathogenesis
Uric acid level in the blood depend on the balance
between purine synthesis and elimination of urate “ by
Kidney and intestine”
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Uric acid synthesis
uric acid is the last stepin the breakdown pathy way of purines
hypoxauthine
↓
Xanthine →xanthine
oxidase ↓
Uric acid
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Uric acid excretion
uric acid is completely filtered by glomerulus
reabsorbad in the proximal tubule 98-100%
50% is secreted by distal tubule .
90% of patients with Gout have impaired excertion of
urate .
1% an inborn error of metabolism leads to purine over
production .
1/3 of uric acid is eliminated in the faeces
Primary Gout – renal clearance of uricacid 90%
Over production < 10%
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Secondary Gout
undersecretion
-Glomerular infiltration(renal disease)
-diuretic therapy
-Volume depletion → tubular reasorbtion →↓ secretion
-Low dose Aspirin →↓urate excretion
-Adrenal insufficiency →volume depletion
-Accumulation of organic acid →inbitor uric acid secretion
-Starvation, alcoholic ketocidosis .diabetic ketoacidosis.
-Lead intoxication , hyperparathyrodism
-hyperthyrodism → unclear .
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Secondary urate over production
- HPRT Deficiency
- PRPP overactivity
- Myeloproliferative and lymphoproliferative
-multiple myeloma
-secondary polycthemia
-pernicious anemia
-hemolyticanemia
-infectious mononucleosis
-Alcohol consumption ]
-MI ]
-Respiratory failure ]
-Statusepilepticus ] →ATPdegradation to uricacide
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Hyperuricemia
Overproduction (10%)
Ethanol
HGPRT or G6PD deficiency
PRPP synthetase overactivity
Myeloproliferative disorders
Cytotoxic chemotherapy
Sickle-cell anemia
Underexcretion (90%)
Renal insufficiency
Drugs and toxins
Diuretics
Ethanol
Cyclosporine A
Pyrazinamide
Lead nephropathy
Low-dose aspirin
Ketosis
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Clinical manifestations
Gouty arthritis
TOPHASEOUS GOUT
Accumulation of urate
crystals in the form of
tophaceous deposits
Uric acid nephrolithiasis
Gouty nephropathy
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1)Asymptomatic hyperuricemia.
2)Acute gouty arthritis.
3)Intercritical (interval) gout.
4)Chronic tophaceous gout.
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All patients with gout have hyperuricemia
(supersaturation of serum for urate) at some point
in their disease
most hyperuricemic individuals never experience a
clinical event resulting from urate crystal deposition
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Predisposing factors
Trauma
surgery
Starvation
alcohol ingestion
dietary overindulgence
ingestion of certain drugs
Low dose ASA
Thiazides and loop diuretics
Cyclosporine
Pyrazinamide
Nicotinic acid
Theophilline
levodopa
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Acute gouty arthritis
Abrupt onset of severe joint inflammation, often with onset in the night
75% of initial attacks in first MTP joint
Usually monarticular, may be polyarticular
Attack subsides in 3-10 days
Urate crystals present in synovial fluid
Hyperuricemia may or may not be present
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ACUTE GOUTY ARTHRITIS
typically occurs after years of asymptomatic hyperuricemia
Acute gout is intensely inflammatory, and is characterized by severe pain, redness, swelling, and disability
Maximal severity of the attack is usually reached over several hours
complete resolution of the earliest attacks occurs within a few days to several weeks, even in untreated individuals
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80% of initial attacks involve a single joint,
typically in the lower extremity
most often at the base of the great toe
The signs of inflammation often extend beyond the confines of
the joint that is primarily involved and, in the foot or ankles, may
give the impression of arthritis in several contiguous joints,
tenosynovitis, or even cellulitis.
Gouty attacks of lesser severity may be mimicked by a stress
fracture or traumatic process in the bone or joint.
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Resolution
Resolution of the acute gouty attack is sometimes accompanied by
desquamation of the skin overlying the affected joint
The response of neutrophils to proteins coating the surface of urate
crystals
The recruitment of additional neutrophils to sites of crystal deposition
The activation of neutrophils by proinflammatory cytokines
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Gout: podagra
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Gout: olecranon bursitis
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polyarticular initial presentation of gouty arthritis may
be more frequent in patients in whom hyperuricemia
and gout arise secondary to a myeloproliferative or
lymphoproliferative disorder, or in organ transplant
recipients who are receiving cyclosporine A
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Chronic tophaceous gout
-the time from the intial attack to begining of chronic gout
(tophaceous)
Averge (medium) 11.6 years.
-deposits of urate crystals appears in cartilage , synovial
membranes , tendons , soft tissue
-fingers , hands ,knees or feet
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Gout of distal interphalangeal joints simulating
osteoarthritis
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Gout: hands
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Gout: tophi, hands
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Gout: tophus, finger (clinical and polarized light
microscopy)
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Gout: tophi, ear
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Gout: tophi of the pinna, ear
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Diagnosis
Monoarticular gouty arthritis can give a clinical picture indistinguishable from acute septic arthritis, including fever, leukocytosis, and elevated erythrocyte sedimentation rate
On rare occasions, acute gout and septic arthritis may even coexist
aspiration of synovial fluid from the affected joint and analysis of the fluid by:
Cell count >50,000 predominantly neutrophils
Gram stain, culture
polarized light microscopic examination
acute gout
pseudogout (calcium pyrophosphate crystal deposition disease)
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Polarized light (diagram)
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Polarizing microscope (diagram)
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Crystals found in synovial fluid
Monosodium urate monohydrate
Acute and tophaceous gout
May be seen in asymptomatic hyperuricemia or intercritical gout
Calcium pyrophosphate dihydrate
Pseudogout
Asymptomatic chondrocalcinosis
Chronic arthropathy
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Gout: urate crystals (polarized and ordinary light
microscopy)
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Gout: urate crystal (polarized light microscopy)
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Gout: monosodium urate crystals (photomicrograph)
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Gout: hand (radiograph)
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Gout: hand (radiograph)
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Gout: foot (radiograph)
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Gout: advanced disease, foot (radiograph)
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Gout: toe (radiograph)
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Gout: foot (radiograph)
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-uric acid
-ESR
-lipid profile
-blood sugar
-KFT
-Blood pressure-
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Treatment
-Acute attack
-Colchicine ( 0.5 – 0.6 hourly ) ?
-NSAID’S – Indomethacin (Indocid )
- Naproxen (Proxen)
-Etirocoxib ( Arcoxia )
- Steroid
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Prophylaxis
After acute attack resolved
-All patients encouraged to limit their purine intake
-Alcohol reduction
-Medication promote hyperuricemia
-↓ Body weight
-Colchicines Img for 3-6 month’s
-Xanthine oxidase inhibitor ( Allopurinol ) .
-Started at 100 mg daily and gradually
titrated up to achieve a serum urate < 6
-Febuxostat is a non purine analoge of uricacid that inhibits urate
synthes
-uricosuic agent ( sulfinpyrazone . probenecid )
-Losartan .
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Calcium pyrophosphate disease
“chondrocalcinosis”
calcified joint cartilage – tendons , ligaments articular
capsules and synovium .
6% of elderly population have articular CPPD
The incidence of symptomatic disease is about half of
gouty arthritis
M : F ( 1.4 – 1 )
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Crystal deposition disease (CPPD): associations
Hyperparathyroidism
Hemachromatosis
Osteoarthritis
Hypomagnesemia
Familial chondrocalcinosis
Hypophosphatasia
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Clinical Features
Acute pseudogout
- Inflammation in l or more joints lasting for
several days or longer
- These episodes are generally less painful
- 50% Knee
- 7 – 10 days.
Provocation of aute attacks by
-Surgery -C.V.A - M.I
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Pseudo R.A 5%
- Multiple joint
- Symmetrical (weeks or months)
-Morning stiffness
-Mild systemic manifestation
ESR ↑ CRP ↑ RF + 10%
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Pseudo-osteoarthritis
-Chronic degenerative arthritis
-Involvement uncommon site of primary O.A
-Wrist – MCP – elbow- shoulder
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Recurrent acute hemarthrosis
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Asymptomatic
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Calcium pyrophosphate dihydrate deposition disease
(CPPD): Presentations
Acute synovitis (pseudogout)
Chronic arthropathy
Atypical osteoarthritis
Atypical spondyloarthropathy
Pseudo-rheumatoid arthritis
Pseudo-neuropathic arthropathy
Radiographic (chondrocalcinosis)
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Diagnosis
-Synovial fluid analysis
-Positive birefringent CPPD crystal
-Rhomboid in shape
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Chondrocalcinosis: calcium pyrophosphate crystals (ordinary,
polarized, and compensated polarized light microscopy)
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- Ca, PO4, Alkphosphatase,
ferritin,iron,TIBC.magnesium andTSH.
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X-ray
- AP knee
- AP pelvis
- PA hands
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Calcium pyrophosphate dihydrate deposition disease
(CPPD): wrist (radiograph)
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Chondrocalcinosis: hand (radiograph)
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Chondrocalcinosis: shoulder (radiograph)
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Chondrocalcinosis: knee (radiograph)
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Treatment
-NSAIDS
-Intra- articular steroid
-Colchicine (pseudo gout)
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