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Reactive vs. Psoriatic Arthritis (PsA)

by Carlo Raj, MD
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    00:02 So seronegative. It’s the HLA-B27.

    00:05 These are all the common features in all of them.

    00:07 Next, predominantly, where is my issue in the back? Lower extremities. Inflammatory. Asymmetric arthritis.

    00:16 One to three weeks after infection.

    00:19 What infection? Now be careful here.

    00:20 Let me remind you to go back and review septic arthritis.

    00:24 We talked about septic arthritis, first we talked about adenitis In other words, there’s a patient who have diabetes, there’s a patient who had sickle-cell disease.

    00:33 Once you get past those facts, and dealt with their history, and that is not been presented.

    00:39 I told you to next take septic arthritis and divide it into gonococcal and non-gonococcal.

    00:45 And under that category, I told you to please focus on non-gonococcal, because under non-gonococcal, a particular bacterial called Staph aureus, is so highly aggressive, that if you’re not aggressive with managing your patient, that patient’s knee is permanently gone.

    01:02 Once you’re completely familiar with that discussion of septic arthritis, then you come back here and keep separate reactive arthritis, in which it’s HLA-B27 seronegative, is that understood? This has nothing, I repeat, and nothing to do with gonococcal.

    01:19 Now what are my organisms? Oh, take a look, some of these includes salmonella, shigella, campylobacter, chlamydia.

    01:26 So, it used to be called Reiter’s.

    01:29 And here’s my triad.

    01:30 And we have urethritis, or let’s go in order.

    01:34 I like to use can’t see, can’t pee, can’t climb a tree.

    01:37 The can’t see part obviously is going to refer to your conjunctivitis and uveitis.

    01:44 If you cannot pee, and you’re thinking about the non-gonococcal urethritis.

    01:47 And if you finally can't climb a tree, because my goodness! You have arthritis! There you have it, reactive.

    01:54 Pathogenesis. Usually triggered by urethritis, cervicitis.

    01:58 Some of the infection include the following: If it’s Chlamydia trachomatis, Remember, this is the urethritis part.

    02:07 It has nothing to do with gonococcal, nothing.

    02:10 The Chlamydia trachomatis, less likely pneumonia, shigella is one that you wanna keep in mind.

    02:17 Particularly, the flexneri.

    02:19 Then you have the salmonella, particularly typhimurium.

    02:23 Yersinia enterocolitica, campylobacter jejuni, and ureaplasma.

    02:29 You need to make sure that you know some of these organisms that are responsible for causing non-gonococcal urethritis in reactive arthritis.

    02:39 The disease is more severe in patient with AIDS.

    02:43 Not exactly sure as to why and B27 in most of your patients, 75-80% reactive arthritis.

    02:52 In the reactive arthritis, let’s take a look at some extra-articular manifestation.

    02:57 MSK stands for musculoskeletal lupus erythematosus polyarthritis.

    03:02 Remember the insertion site of a tendon into the bone, may undergo inflammation.

    03:07 We call that enthesopathy, dactylitis, sacroiliiatis.

    03:10 Remember the urethritis will be non-gonococcal.

    03:14 Organisms here could include, are shigella, could be salmonella, could be chlamydia, could be your campylobacter jejuni.

    03:21 Ocular could have conjunctivitis.

    03:23 Please picture the conjunctiva and uvea, specifically the anterior uveitis.

    03:30 On the sole of the foot here, we’re seeing a particular derm issue with reactive arthritis that we then refer to as being blennorhagica.

    03:41 And then, what I will show you is something called circinate balanitis around the penis.

    03:47 In the cardiovascular system, they might have pericarditis, pericardial rubs, AV blocks.

    03:55 Reactive arthritis, you could find aortitis.

    03:58 Men are affected more so than woman were reactive arthritis.

    04:02 Due to cervicitis typically less symptomatic and then urethritis.

    04:08 Chronic symptoms after viral syndrome resolution is common with viral.

    04:15 The signs that you are looking for as a clinician, the hands are inflamed, dactylitis.

    04:22 Take a look at the conjunctiva here, the injected conjunctivitis.

    04:28 On close examination, if by chance in the window of the cornea you’ll find a little bit of fluid accumulation, well, the uvea has been affected, uveitis.

    04:39 The picture in the far right is your penis, and the penis here, circinate balanitis.

    04:45 All part of the syndrome of reactive arthritis.

    04:49 Remind me again, what must you find here before—our topic is what? Our topic is seronegative, so rheumatoid factor negative, spondyloarthropathies, mostly, patient will be HLA-B27 positive, correct? Diagnosis.

    05:07 Look for temporal correlation between the infection and the onset of symptoms.

    05:13 The differentials may include gonococcal.

    05:16 With gonococcal we talked about how you get a purulent type of arthritis, or purulent type of synovial fluid with lots of WBCs.

    05:26 In addition, we talked about the triad including tenosynovitis.

    05:30 Also talked about pustular or derm issues, there may be polyarthralgia.

    05:35 In lyme disease, you’re looking for patient coming in from maybe New England, particular Connecticut, and they went hunting, right? And the tick then introduced, unfortunately, a dangerous bacteria, what we call borrelia burgdorferi.

    05:51 Rheumatoid arthritis, well with that, we may find rheumatoid factor to be positive, and rheumatoid arthritis will be more symmetrical and the patient has morning stiffness that may last greater than an hour.

    06:05 Gout, and then pseudogout, technically called calcium pyrophosphate disease.

    06:11 These are all differentials that you wanna keep in mind when dealing with the joints.

    06:15 However, remember, keep to your roots in your foundation, HLA-B27 Rf negative.

    06:20 Management. Include NSAIDs first.

    06:23 And then followed by your drugs or disease modifying anti-rheumatologic agents or drugs called DMARDs.

    06:33 Doxycycline for at least three months.

    06:36 If the patient, remember, the urethritis could be cause by chlamydia.

    06:40 You got to clear that out so for three months in case the chlamydia… to eradicate the infection completely.

    06:46 Keep that in mind, please, for doxycycline and chlamydia.

    06:50 Another type of seronegative spondyloarthropathy brings us to psoriatic arthritis.

    06:59 Let me tell you, right off the bat, the psoriatic arthritis, that the patient, only 15% at a time that those patient’s that have the traditional salmon plaques of psoriasis.

    07:12 May then have involvement of the bone or vertebrae.

    07:15 Only about 15% maybe 30% at the max.

    07:18 It’s a small percentage but still very important for you to know.

    07:22 Seronegative spondyloarthropathy, HLA-B27.

    07:25 Here the presentation oftentimes is going to be the skin rash.

    07:31 And then issues with our bones.

    07:34 I will show you pictures on x-ray of the hand for example.

    07:39 Appears like rheumatoid arthritis, but what does that mean? That means that rheumatoid arthritis might have ulnar deviation.

    07:47 You will also perhaps have issues with the metacarpophalangeal or maybe the PIP.

    07:54 But joint involvement is quite different here.

    07:56 As you shall see the patterns are important.

    07:57 You’ve heard of maybe your pencil type of deformity.

    08:01 I’ll show that coming up.

    08:03 It can be symmetrical or asymmetrical but that doesn’t tell you too much.

    08:07 Pathogenesis.

    08:10 Psoriasis, really unknown as far as arthritis.

    08:13 B27 positive seen with sacroiliitis.

    08:17 Now, as I told you, these conditions of seronegative tend to be in the lower back so here is sacroiliitis.

    08:25 If you take a look at the hand on close examination.

    08:29 Proximally, you will find the salmon plaque color or salmon-colored plaque, referring to the psoriasis.

    08:37 Parakeratosis will be expected to be seen on histology.

    08:41 But most will develop skin lesion way before their arthritis.

    08:45 And maybe, perhaps about 15-30% of your patients may then involvement of the bones.

    08:52 Now, we're gonna take this hand here and then we're gonna do an x-ray.

    08:57 And when we do an x-ray, we get something in which we then referred to as being pencil in a cup type of appearance.

    09:05 The DIP is being involved associated with something known as onycholysis and pitting.

    09:11 And so oftentimes, what you’ll find, is that the tips of the fingers might then undergo erosion when there is pitting taking place, dry skin pitting.

    09:21 Resembles severe osteoarthritis.

    09:23 And then we have the pencil-in-cup as what this arrows are then pointing to.

    09:27 Take a look at the DIP, please.

    09:29 Asymmetrical and dactylitis once again could be common here.

    09:34 The inflammation of the hand is a common occurrence in, once again.

    09:38 Continue our discussion of five patterns of arthritis.

    09:44 The third here, might be symmetrical polyarthritis.

    09:47 Very similar to rheumatoid arthritis, keep that in mind but obviously here, rheumatoid arthritis might be Rf positive.

    09:52 Here, we have Rf negative, seronegative.

    09:55 Fourth, arthritis mutilans.

    09:58 In other words, what may happen so badly, severe enough, is that with the erosion and destruction taking place.

    10:04 Imagine looking at the stars at night with a telescope.

    10:09 Now, with the telescope, you can either pull it out or you can push it back in.

    10:14 Correct? And what may happen with such severe destruction of the finger is that, one part of the finger distally may then erode into the proximal literally telescoping of the digits.

    10:26 That is not good.

    10:28 And then, sacroiliitis.

    10:31 Here are five patterns of arthritis that you might find with psoriatic arthritis.

    10:36 Look for the skin lesion, please.

    10:37 The salmon-colored plaques that I showed you earlier.

    10:40 Management of psoriatic arthritis.

    10:43 Remember we're trying to take care of the bone issues, of the joint issues.

    10:48 NSAIDs and like many others, when we talked about DMARDs, that these modifying agents or anti-rheumatologic drugs, here once again will be pertinent.

    10:59 And number two, anti-TNF therapy, the biologics that you wanna keep in mind.

    11:03 Now, I’m just gonna mention our fourth and final type of seronegative spondyloarthropathy.

    11:12 The details of our enteropathic arthropathy are inflammatory bowel diseases that we have discussed in great detail in gastroenterology obviously.

    11:26 However, there’s a possibility of a patient, has ulcerative colitis or Crohn’s disease, in which the vertebrae could be affected or the bones could be affected, maybe lowered back pain.

    11:39 When that happens, we then refer to it as being enteropathic type of arthropathy.

    11:43 Now with this then, this then completes our four major types of seronegative spondyloarthropathies.

    11:51 We went through the common features that you'd expect to find in all four.

    11:56 Now, we have integrate detail in those in which you were able to differentiate ankylosing spondylitis, from reactive arthritis, from psoriatic arthritis, and then obviously here we have GI issues with our enteropathic including our two major inflammatory bowel diseases.


    About the Lecture

    The lecture Reactive vs. Psoriatic Arthritis (PsA) by Carlo Raj, MD is from the course Seronegative Spondylarthropathies. It contains the following chapters:

    • Introduction to Reactive Arthritis
    • Signs and Symptoms of Reactive Arthritis
    • Psoriatic Arthritis
    • Symptoms of Psoriatic Arthritis

    Included Quiz Questions

    1. Gonococcus.
    2. Chlamydia trachomatis.
    3. Shigella.
    4. Campylobacter.
    5. Yersinia.
    1. Reactive arthritis.
    2. Rheumatoid arthritis.
    3. Osteopetrosis.
    4. Osteoarthritis.
    5. Osteoporosis.
    1. Doxycycline for 3 months.
    2. Tetracycline for 3 months.
    3. Methotrexate for 3 months.
    4. Pencillamine for 3 months.
    5. Erythromycin for 2 months.
    1. Skin lesion appear before the development of arthritis.
    2. Pathogenesis involves an organism.
    3. It is HLA-B27 negative.
    4. Skin lesions appear after the development of arthritis.
    5. It is always asymmetrical.
    1. Proximal interphalangeal joint arthritis.
    2. Pencil in a cup appearance.
    3. Symmetrical polyarthritis.
    4. Sacroiliitis.
    5. Dactylitis.
    1. Psoriatic arthritis.
    2. Enteropathic arthropathies.
    3. Ankylosing spondylitis.
    4. Reiter’s syndrome.
    5. Osteoarthritis.

    Author of lecture Reactive vs. Psoriatic Arthritis (PsA)

     Carlo Raj, MD

    Carlo Raj, MD


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