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Year 2- MSK > RA - Rheumatoid Arthritis > Flashcards

RA - Rheumatoid Arthritis Flashcards

1
Q

What is rheumatoid arthritis (RA)?

A

RA is an autoimmune disorder causing symmetrical joint pain, swelling, and synovial destruction

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2
Q

What are the risk factors for RA?

A

(1) Genetic predisposition (HLA DRB1 gene)
(2) Environmental triggers (smoking, infection)
(3) Higher incidence in females (3:1 ratio)

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3
Q

At what age is RA most prevalent?

A

Prevalence peaks between 40-60 years

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4
Q

Describe the pathophysiology of RA

A

The synovium becomes inflamed, leading to the destruction of cartilage and bone by inflammatory mediators

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5
Q

What triggers are implicated in RA?

A

Smoking, infection, and trauma

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6
Q

What forms as a result of synovial inflammation in RA?

A

An inflammatory pannus (granulation tissue) forms, which destroys the cartilage extracellular matrix

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7
Q

What autoantibodies are generated in RA?

A

(1) Anti-citrullinated peptide antibodies (anti-CCP)

(2) Rheumatoid factor (RF)

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8
Q

What is rheumatoid factor (RF)?

A

RF is an IgM or IgA antibody that binds to the Fc region of IgG

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9
Q

What are the main articular symptoms of RA?

A

(1) Symmetrical joint pain
(2) Swelling of affected joints
(3) Morning stiffness (>30 minutes)
(4) Affecting small joints like PIPs, MCPs, and MTPs
(5) Reduction in grip strength

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10
Q

Which joints are typically spared in RA?

A

The DIP joints

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11
Q

What spinal involvement can occur in RA?

A

Atlanto-axial subluxation (C1-C2)
= Only joint in spine with synovium

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12
Q

What blood tests are indicative of RA?

A

Inflammatory - (CRP, Plasma Viscosity, ESR)

Autoantibodies - Rheumatoid factor or anti CCP antibodies

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13
Q

What is the DAS28 score used for?

A

Measure disease activity in RA by

(1) counting tender/swollen joints

(2) CRP levels

(3) Patient’s assessment of the disease

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14
Q

What is the first-line treatment for RA?

A

DMARD monotherapy → methotrexate.
Within 3 months of symptom onset. Often with a corticosteroid bridge

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15
Q

What is the second-line treatment if the first DMARD fails?

A

Combination DMARD therapy, such as methotrexate with hydroxychloroquine or sulfasalazine

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16
Q

What is the third-line treatment for RA?

A

Biologics or targeted synthetic DMARDs, such as TNF-inhibitors

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17
Q

Name a key side effect of methotrexate

A

(1) Bone marrow suppression
(2) Infection
(3) Liver function derangement
(4) Pneumontitis
(5) Nausea

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18
Q

What is Felty’s syndrome?

A

Triad of
1. RA
2. Neutropenia
3. Splenomegaly

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19
Q

How is hydroxychloroquine monitored for safety?

A

Requires retinal screening 5 years after starting, as it can cause retinal toxicity

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20
Q

Negative antibodies exclude RA. True or False

A

false

21
Q

X-rays are abnormal in early RA, and normal X-rays exclude RA. True or false

A

False

22
Q

Ideally, when should DMARD therapy be started in Rheumatoid Arthritis?

A

As soon as diagnosis of RA confirmed ( ideally within 3 months of symptom onset)

23
Q

In a patient with newly diagnosed rheumatoid arthritis, what is the best treatment choice?

A

Methotrexate

24
Q

Is Methotrexate safe in pregnancy?

A

Nope

25
Q

In a patient with newly diagnosed rheumatoid arthritis, what is the best treatment choice?

A

Methotrexate

26
Q

A 42-year-old man started on Methotrexate 12 weeks earlier for rheumatoid arthritis.
He is now complaining of a cough and some breathlessness when walking up stairs.

He has crackles at both lung bases.

What would you be most concerned about?

A

He has methotrexate pneumonitis

27
Q

A 36-year-old man has rheumatoid arthritis and has very sore joints despite treatment with methotrexate, sulphasalazine and hydroxychloroquine. His DAS 28 score is 5.88

What would be the next stage in treatment? and why?

A

Start anti-TNF therapy

= As he has tried 2 different DMARDs, and disease activity remains high ( ie. DAS28 > 5.1) he qualifies for a biologic therapy.

28
Q

He is started on certolizumab and does very well. He then returns to the clinic feeling tired and having lost 2 stone in weight. He has a cough.
It transpires that he spent 2 years as a teenager in Subsaharan Africa

What condition are you concerned about?

A

Tuberculosis

29
Q

Which chest X-ray finding are you most likely to find in a patient recently diagnosed with sarcoidosis?

A

Bilateral hilar lymphadenopathy

30
Q

On initial diagnosis of rheumatoid arthritis, how many and which DMARDs should be prescribed?

A

A combination of 2 DMARDs should be used upon diagnosis. One of them is usually methotrexate

31
Q

What medications are safe to control symptoms of Rheumatoid Arthritis during pregnancy?

A

Mild → Simple analgesia with Paracetamol with a weak opioid can be sufficient

Flare-ups → Low dose Prednisolone can be added

Hydroxychloroquine and/or Sulfasalazine with concomitant Folic Acid can be continued during pregnancy

32
Q

When should patients with small joint swelling and suspected persistent synovitis in primary care be referred to a Rheumatology service?

A

Within three working days

33
Q

How long is the washout period for Methotrexate in women with Rheumatoid Arthritis who are planning on starting a family?

A

3 months

34
Q

What DAS scores indicate high disease activity levels?

A

above 5.1

35
Q

What are the baseline blood tests required when Hydroxychloroquine is initiated for Rheumatoid Arthritis?

A

Full blood count, urea and electrolytes, creatinine and liver function tests

36
Q

What is the treatment for a new presentation of rheumatoid arthritis?

A

Steriods + DMARDS

DMARDs are methotrexate and hydroxychloroquine

37
Q

Which treatments for rheumatoid arthritis slow down progression of the disease?

A

(1) DMARDs eg. Methotrexate, Sulfasalazine, Hydroxychloroquine, Leflunomide

(2) Biologics eg. Anti-TNF’s such as infliximab

38
Q

What group of patients with Rheumatoid Arthritis is Felty’s Syndrome more common in?

A

extra-articular manifestations

39
Q

What is the specificity and sensitivity of Rheumatoid Factor?

A

Around 70%

40
Q

Why can Folic Acid not be taken on the same day as Methotrexate?

A

Folic Acid (5mg) has to be prescribed together with Methotrexate and has to be taken on a separate day to avoid interference with the therapeutic action of Methotrexate

41
Q

What are the main risk factors for rheumatoid arthritis?

A

Female sex (three times as common)

Smoking

42
Q

What change in DAS score indicates no response to treatment?

A

A change in DAS score of 0.6 or less

43
Q

Which drugs can interact with methotrexate to potentiate its toxic effects?

A

Drugs that also inhibit the metabolism of folate

> Trimethoprim

44
Q

Which autoantibody is considered specific for polyarteritis nodosa?

A

pANCA

45
Q

How does Etanercept work?

A

Etanercept is a TNF receptor

46
Q

What change in DAS score indicates a good response to treatment?

A

DAS score of more than 1.2

47
Q

What is the classic pattern of joint involvement in rheumatoid arthritis?

A

(1) Symmetrical

(2) Polyarticular arthritis involves the small joints of

(3) The distal interphalangeal joints are usually spared

48
Q

What change in DAS score indicates a moderate response to treatment?

A

A change in the DAS score of between 0.7 to 1.2

49
Q

What DAS scores indicate remission?

A

DAS scores below 2.6

Year 2- MSK (12 decks)

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