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Gout and Hyperuricemia
PTX2 Week1
80
Other
Professional
08/26/2011

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Cards

Term
What is Gout?
Definition
The deposition of Monosodium Urate crystals in joints and tissues
Term
What causes an accumulation of urate?
Definition

1. Disorder of purine metabolism that causes an overproduction

 

2. Disorder of urate elimination that causes an underexcretion

Term
What is the most important risk factor for Gout?
Definition
Hyperuricemia
Term
List 3 sources of purines that cause the production of uric acid.
Definition

1. Diet

2. De Novo

3. Tissue Turnover

Term
What types of foods can cause Gout?
Definition

1. Meats, especially organs

2. Seafood

3. Coffee

4. EtOH

Term
At what [M+] does Urate saturate in the plasma?
Definition

7.0 mg/dL

 

**You want below this amount to avoid gout**

Term
Where does MSU deposit?
Definition

In peripheral Tissues

Joints

Cartilage, tendons, ligaments

Term
Why is pain associated with Gout?
Definition
The long needle shaped crystals get ingested by macrophages.  They then lyse and create a local and systemic inflammatory response.  This causes more macrophages to ingest.
Term
Risk factors (RF) for Gout can be modifiable and nonmodifiable.  What are some nonmodifiable RF?
Definition

1. Age

2. Sex

Term
T/F:  Tom a 65 yro male is less likely to develop Gout then Ann a 50 yro woman.
Definition

False

 

Old> young

Male >female

Term
Why is the incidence for Gout roughly the same for both men and women after the age of 65?
Definition
Pre-menopausal women have estrogren that provides protection against gout.  As women age there estrogen levels decrease and eventually go thru menopause and they lose that protection.
Term
List some Modifiable RF for Gout.
Definition

1. Diet

2. Serum Uric Acid

3. EtOH intake

4. Rx

5. HT
6. Renal disease

7. Transplantation

8. Obesity

9. Metabolic Syndrome

Term
Which food product actually decreases the risk of Gout by 44%?
Definition
Low Fat Diary Products
Term
T/F: Both Beer and wine increase the risk of Gout.
Definition
False; wine does not increase it
Term
Can you treat Gout with diet modification alone?
Definition

No, even with a low purine food diet the best results you can obtain is a decrease in Urate by 1 mg/dL.  You need Rx.

 

Also adherence to this diet is very low!

Term
Which drugs cause a decrease in Uric acid elimination thus leading to hyperuremia?
Definition

1. Loop and Thiazide diuretics

2. Nicotinic Acid

3. Salicylates under 2G/day (low doses)

4. Ethyl Alcohol

5. Cyclosporines

Term
List the 4 stages of Gout
Definition

1. Asymptomatic Hyperuricemia

2. Acute/recurrent Gout

3. Intercritical Gout

4. Chronic Tophaceous Gout

Term
Asymptomatic Hyperuricemia is (more/less) __________ common than Gout.
Definition
More
Term
Asymptomatic HU has an elvated level of urate w/out complications.  If there are no symptoms when and why do you treat?
Definition

1. When UA > 10 mg/dL there is a  > 50% chance of getting gout

 

2. When UA excretion is > 1100 mg/day  there is a > 50% chance of nephropathy

Term
How does Acute/Recuurent Gout present itself?
Definition

1. Acute inflammation to a single joint

2. Fever

3. Intense pain

4. Erythema

5. Warmth and Swelling of joint

 

Term
Where area does Acute Gout most often affect?
Definition

The 1st Metatarsaphalangeal (MTP) = big toe

 

can also effect the instep, ankeles, heels, knees, wrists, fingers and elbows

Term
Why is Chronic Tophaceous Gout rare?
Definition
It is a long term complication of Gout. A person would have had to of had gout that was untreated for more than 10 yrs.
Term
Define Tophi and where are classic tophi located?
Definition

Deposits of Urate Crystals in soft tissue

 

Classic Tophus is in helix of ear

Term
What are some complications of Chronic Gout?
Definition

1. Soft Tissue Damage

2. Deformity

3. Joint Destruction

4. Nerve compression syndromes like Carpel Tunnel Syndrome

Term
What is the best and definitve diagnosis for Gout?
Definition
Confirming and isolating Urate Crystals in the affected joints by Arthrocentesis
Term
T/F: You can only have Gout if you have high amount of Serum Uric Acid.
Definition
False; you can have a normal SUA and still have Gout
Term
What are the goals of therapy for Gout?
Definition

1. Terminate acute attack

2. Minimize risk of future attacks

3. prevent/reverse complications associated w/chronic crystal deposition

4. Prevent/reverse associated conditions like obesity, HT

Term
With an Acute Gouty Attack what is the Drug of Choice?
Definition
Any NSAID will work
Term
When should you take a NSAID if you have an Acute Gouty attack?
Definition
The sooner you take it after the attack the earlier your symptoms resolve.  Efficacy dependent on When not Which.
Term
When should a patient with Acute Gout see relief after taking an NSAID?
Definition

Should get symptomatic relieft within 24 hrs.

Complete resolution in >90% of people within 5-8 days. 

Term
What are some adverse effects in using an NSAID for Acute Gout?
Definition

1. GI ( bleeding, gastritis)

2. Renal (decreases CrCL, necrosis)
3. CV (increasing BP and fluid retention)

4. CNS (dizzy, headache, decrease cognition)

Term
Which patients should not use an NSAID if they have Acute Gout attack?
Definition

People with the following:

 

1. PUD
2. Uncontrolled HT

3. Renal insufficiency

4. CAD

5. Those on anticoagulants

Term
What is the MOA of Colchicine for treating Acute Gouty Arthritis?
Definition
It inhibits neutrophil migrations, thereby interfering with the inflammatory response to MSU.
Term
What is the appropriate dose for Colchicine in treating Acute Gout?
Definition

1.2 mg at onset of attack followed by 0.6 mg 1 hr later.

 

The max dose is 1.8 mg

Term
Which dosage form of Colchicine is worse and why?
Definition

IV!

Can lead to alopecia, bone marrow suppression, Acute renal failure, liver failure, seizures, DEATH.

Term
T/F: It is better to treat Acute Gouty Arthritis with IV Colchine because it will work faster.
Definition

False;

You dont want to use an IV can lead to DEATH and other complications

Term
What happens to the efficacy of Colchicine with time?
Definition
It deteriorates if treatment was not started < 48 hrs
Term
When should a patient use Colchine for Acute Gout?
Definition
When they are unable to take an NSAID
Term
List some adverse effects with the use of Colchicine.
Definition

1. GI (80% of peeps)

2. Bone Marrow Suppression

3. Motor problems

4. Toxicities

Term
When should Corticosteriods be given in order to treat Acute Gout attacks?
Definition
Reserved for polyarticular attacks in patients that do not tolerate NSAIDs or Colchicine.
Term
What are some Adverse effects associated with CS?
Definition

Fluid Retention

Weight gain

Impaired wound healing

Psychosis

HPA Suppression

Osteoporosis

Immunosuppression

Term
T/F: CS rebound gouty flares.
Definition

True;

this is why we taper over 7-10 days

Term
What is a nonpharmacological Tx for Acute Gouty Arthritis?
Definition
Applying Ice
Term
Why is the Big Toe mostly affected with Acute Gout?
Definition
It has a lower temperature so it changes the solubility of Uric Acid to saturate and crystallize at lower levels of UA.
Term
T/F: ACTH is more effective in patients who are on chronic CS.
Definition

False;

Less effective

Term
What type of Drug interactions does Colchicine have?
Definition
With Erythromycin, Cyclosporins and Statins
Term
Patients with Acute Gouty Arthritis and renal insufficiency should take what types of Rx?
Definition

Intra-Articular or Systemic CS

ACTH is available

Caution w/use of Colchicine

Term
T/F: Starting a Urate Lowering Therapy during an Acute Gout attack is best for the patient.
Definition
False; will make things worse
Term
Why is Intercritical Gout Prophylaxis administed?
Definition
To reduce the frequency of recurrent attacks
Term
When do you use Prophylaxis for Intercritical Gout?
Definition

1. 1-3 months before starting an Urate Lowering Therapy

2. If you have 2-3 attacks/yr or 1 severe attack

3. Serum Urate > 10 mg/dL

4. 24 hr Urate excretion > 1000 mg

5. If has complicated urate nephrolithiasis

Term
When can you stop prophylaxis for Intercritical Gout?
Definition
When they have been attack for 1-2 yrs and there SUA is normal.
Term
What Rx can be used for Intercritical Gout Prophylaxis?
Definition

1. Low dose Colchicine

2. Low dose NSAIDs

Term
What is the max dose of Chochicine if you have a CrCL btwn 35-49 ml/min?
Definition
0.6 mg  every day max
Term
If the CrCL was btwn 10-34 ml/min what is the dosing of Colchicine?
Definition
0.6 mg every 2-3 days
Term
When should you start someone on a Urate Lowering Therapy?
Definition

1. 3 or more attacks/yr

2. Urate is always > 11mg/dL

3. Radiographic changes

4. Tophaceous deposits

Term
When are you considered an underexcretor of UA?
Definition
With a 24 hr urine sample of UA < 600
Term
When are you considered an Overproducer of UA?
Definition
With a 24 hr Urine sample of UA > 600
Term
_________________ acccounts for 90 % of cases whereas ___________accounts for the other 10%.
Definition

Underexcretors

Overproducers

Term
How does Allopurinol work in lowering Urate levels?
Definition
It inhibits the enyzme that is responsible for urate synthesis = Xanthine Oxidase Inhibitor
Term
How much of a decrease will you expect to see in a patient taking Allopurinal?
Definition
1/3 Reduction
Term
What is the dosing for Allopurinol?
Definition
You want to start at 100 mg and increase every 1-4 weeks until the SUA is normal/reached its goal.
Term
What is the typical dose for Allopurinol?
Definition
300 mg
Term
With decreasing renal function what do you want to do to the dosing of Allopurinol?
Definition

Decrease the dose. 

CrCL of 60-90 mg/dl = 200 mg

CrCL of 30-59 mg/dl = 100

CrCL of < 30 mg/dl = 50-100 mg

Term
What are some adverse effects you need to counsel a patient who is taking Allopurinol?
Definition

1. Pruritis and mild rash (skin rxn)

2. Rare, severe, dose dependent hypersensitivity

that can cause liver/kidney failure, death, fever

Term
Allopurinol has drug interactions with which drugs?
Definition

1. Low dose ASA

2. Warfarin

3. Mercatopurine

4. Ampicillin

5. Thiazide Diuretics

6. Azathioprine

7. Theophylline

Term
Which drug was approved last year and lowers the serum urate by 1/2 (more than Allopurinol)?
Definition
Febuxostat (Uloric)
Term
How do you dose Febuxostat?
Definition

Take 40 mg Every day

Can increase to 80 mg after 2 weeks if the SUA is still > 6.0 mg/dL

Term
How do Uricosurics work?
Definition
They block the rebsorption of filtered urate in the proximal tubules thus trap it in the lumen to be excreted.  This lowers the SUA.
Term
When can you use an Uricosuric?
Definition

1. Documented underexcreter

2. If CrCl > 50 ml/min

3. If not on low dose ASA

4. Have no nephrolithiasis

Term
Why cant you give a Uricosuric drug to a patient who is on ASA?
Definition
ASA inhibits the Uricosuric action
Term
Some adverse reactions of Uricosuric drugs include:
Definition

1. Nausea/vomiting

2. Allergic rxn

3. Urolithiasis

4. Anorexia

Term
If a patient develops Urolithiasis, what can they do?
Definition

Hydrate!!! Drink 2-3 L/day

We also want to alkalinize the urine

Term
Name a Uricosuric drug.
Definition
Probenecid
Term
Describe the dosing for the drug Probenecid.
Definition
Start at 250 mg by mouth 2x/day.  Gradually titrate every 1-2 weeks until the urate is < 6.0 mg/dL. 
Term
T/F: Probenecid is safe to use on patients with uric acid kidney stones.
Definition
False; Contraindicated
Term
What are some Rx that are used to help alkalinize the pH?
Definition

1. NaHCO3/K Citrate

2. Citric Acid/Na Citrate

Term
Both ______________ and _____________ are Rx that increase the renal urate clearance thus decreasing the Urate.
Definition

Losartan (for high B.P)

Fenofibrate (for high lipids)

Term
Overproducers should use _________________ whereas underexcretors should use ______________.
Definition

Allopurinol

Uricosurics

Term
How should Naproxen (Aleve) be administerd for Acute Gouty Arthritis?
Definition

500 mg 2x/day for 3-5 days

then 250 mg 2x/day for 2-3 days

Term
How should Ibuprofen be administered for the treatment of Acute Gouty Arthritis?
Definition

800 mg 1x/day for 3-5 days

then 400 mg 1x/day for 2-3 days

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