Q: We had low Anti-DNAseB and ASO titers, does that rule out PANDAS?
A: Unfortunately, No. First, the tests have to be taken during the rising titer period. ASO tends to rise 1-4 weeks post infection and Anti-DNAseB tends to reach a peak at around 6-8 weeks. Even with perfect timing of titer draws, 31% of children with confirmed colonized strep did not have a rise in either ASO or Anti-DNAse B. So anti-DNaseB and ASO can confirm a previous strep infection, but cannot rule one out.
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Tests: Antineuronal Antibodies Tests
Q: What are Cunningham tests?
A: Kirvan and Cunningham have been studying specific antibodies to GABHS. Cunningham has an open trial where she is recruiting patients to investigate the relationship between these antibodies and PANDAS symptoms. Many parents on this forum have participated in the study. These studies are still research studies and are not yet diagnostic for PANDAS -- but we're all hopeful they might be soon.
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Tests: Predinsone Burst Test
Q: What is the purpose of a prednisone burst and why does it work?
A: The prednisone burst is used to temporarily slow down the immune system response by reducing inflammation (from T-cells) and reducing antibody production by B-cells. It is thought that prednisone helps close the blood-brain barrier temporarily. Essentially, abatement of symptoms in a prednisone burst helps indicate that the issue is auto-immune. It is important to know that the prednisone burst is a short term treatment (typically 5 days) and is not intended as a long term treatment. Prednisone does have significant side effects particularly for any long term use. Prednisone has no known positive effect on non-PANDAS OCD or non-PANDAS tics.
Q: How long after starting antibiotics should I expect a response?
A: In severe exacerbations, some parents have reported a response within 24 hours. However, more parents have reported significant improvement 10-12 days post initiation of antibiotics. Anecdotal evidence indicates that exacerbations can last for many weeks (often 4-6 weeks). Parents with children on prophylactic antibiotics seem to report that subsequent exacerbations do occur but are less severe than without antibiotics.
Q: How long after starting a prednisone burst should I expect a response?
A: Similar to antibiotics, most parents have reported significant immediate improvement during severe exacerbation and temporary remission of symptoms at 10-12 days post initiation of prednisone. This test seems to vary with age, symptoms and gender. Caution should be noted here that parents of children with diagnosed Tourette's Syndrome have noted that symptoms actually got much worse during a prednisone burst. As such, there should be good clinical reasons for a PANDAS diagnosis before using a prednisone burst.
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Treatment: Antibiotics
Q: If PANDAS is caused by an antibody, why do so many parents have their kids on prophylactic antibiotics?
A: The antibody is an immune response to Group A Beta-Hemolytic Streptococcus. Many of the parents on this board have seen that subsequent exacerbations are much more severe (similar to the case for other auto-immune disorders to GABHS such as Sydenham Chorea). The prophylaxis is to minimize colonization and infection by GABHS.
Q: Can Amoxicillin and Augmentin be given only once a day for prophylaxis?
A: Apparently not. Amoxicillin and Augmentin both have extremely short half-lives (1-1.5 hours). This means that most of Amoxicillin/Augmentin is removed from the body in ~10hours. If a dose is skipped, the child is actually unprotected for 1-2 days. Azithromycin has a longer half-life (~1.5 days), can be taken once per day and is easier on the GI tract, but there are reports of macrolide resistant strains of GABHS.
Q: Do antibiotics kill Group A Beta-Hemolytic Streptococcus?
A: Not exactly. Antibiotics such as Amoxicillin, Azithromycin and Augmentin slow down the progression of the bacteria and prevent it from rapidly growing. This gives the child's immune system a chance to respond to the infection and kill the bacteria. Antibiotics alone aren't sufficient to eradicate strep, the body's immune system must complete the job.
Q: Which is better amoxicillin, augmentin or azithromycin?
A: This is a matter of considerable debate. Both Augmentin and Azithromycin are more clinically effective in clearing GABHS than Amoxicillin. Some strains of strep can go intracellular (where azithromycin is more effective) and some strains are macrolide tolerant (where augmentin is more effective). Often a parent will try 2 different antibiotics over a period of 2 months to find one that seems to work.
Q: My child doesn't seem any better after 10 days of amoxicillin. Does this mean he doesn't have PANDAS?
A: No. Many children actually need a stronger antibiotic than the standard treatment of amoxicillin. The standard dosage of antibiotics is based on clearing 80% of children who have a healthy immune system. For others who fall outside the standard dosing parameters, typically either augmentin or azithromycin are used. Anecdotally, parents on the forum have found that a month is needed to really evaluate whether a particular antibiotic is working. In addition, some strains of GABHS are more sensitive to one antibiotic versus another. Azithromycin is helpful if the strain is one that goes intracellular, Augmentin is helpful inhibiting extracellular strains.
Q: "Saving Sammy" said they used high dose Augmentin/XR. Why is that thought to work?
A: This isn't exactly known. At very high dosage, Augmentin is bacteriacidal (meaning it actually does kill strep). One theory is that there is a strep infection hidden (perhaps inside cells) and once the cell dies it releases strep into the blood stream. In this case, Augmentin could stop the GABHS before an immune response. There is some good anecdotal evidence for this, but this has not been clinically studied. Some researchers have indicated to parents that Augmentin may be anti-inflammatory at high dose, but there is no clinical studies to support this hypothesis.
Q: Why use prophylactic abs in PANDAS children...why not just wait until my child gets a strep infection and treat it then?
A: There is mounting evidence that each exacerbation has increased symptoms and thus prophylaxis prevents significant psychological and neurological symptoms. Gratefully, there does not appear to be any long-term damage from PANDAS; however, this is still a matter of research.
Q:Should I check for clearing of my non-PANDAS children if treated for strep
A: Yes. About 3 weeks after completing treatment for strep you can check for clearance by getting a negative culture. The dosing levels on antibiotics are designed so that about 80% of children with normal immune systems are cleared with a "standard" dosing of antibiotics. Some strains of strep are harder to eradicate and either longer treatments or use of antibiotics like azithromycin and augmentin seem to be effective on these strains.
Q:Why are doctors so hesitant to prescribe antibiotics or check for GABHS in asymptomatic children
A: The concern is primarily around creating a treatment resisitant form of GABHS. By overprescribing antibiotics, doctors worry that some of the bacteria that is resistant to that form of antibiotic will survive and replicate. Antibiotics slow down the growth of the target (e.g., GABHS) and also helpful bacteria. This means that an antibiotic resistant strain could grow uncontrolled while the normal competing non-dangerous bacteria is held back. It's all a matter of balance and antibiotics do upset that balance. In terms of checking for GABHS in asymptomatic children, this is a matter of considerable debate. The exact reason why some children don't exhibit classic "sore throat" signs or why their colonization doesn't seem to turn into full infections is just not known. There is mounting evidence that asymptomatic carriage is not as benign as once thought, but most doctors have not read these research reports.
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Treatment: IVIG, Plasmapherisis, and Plasma Exchange
Q: What is IVIG and PEX?
IVIG stands for Intravenous Immunoglobulin. Immunoglobulin antibodies, type G, are extracted from donated blood. These antibodies are transferred to the recipient through an intravenous line. IVIG is used in many auto-immune diseases but the exact nature of how it works is not known. IVIG is highly anti-inflammatory and may help T-regulatory cells become re-activated to help remove anti-host antibodies. In addition, some of the infused antibodies may help recognize infected cells or bacteria that was missed by the recipient's own antibodies.
PEX technically stands for Plasma Exchange. It is sometimes used interchangeably (especially on this forum) with plasmapheresis. Plasmapheresis is a process of removing antibodies from the blood stream through filtration. In Plasma Exchange (PEX), another donor's plasma is added on the return so that new antibodies are added (similar to IVIG). Plasmapheresis is used in severe auto-immune diseases because it can address acute antibody levels.
Q: Why does IVIG or Plasmapheresis work?
A: PANDAS is thought to be caused by three events:
the creation of an antibody to Group A Beta-Hemolytic Streptococcus that can react with neuronal tissue
the failure of the immune system to suppress the antibody
a breach of the blood-brain barrier so that a B-cell or the antibody can reach the neuronal tissue
IVIG is highly anti-inflammatory and can close #3. There are also reports that IVIG resets the T-regulatory cells addressing #2. Plasmapherisis works by removing the antibodies in #1. Antibiotics also help with #1 by slowing an infection so the immune system can kill the bacteria. Once the antigen (the bacteria) is removed, the antibodies generally disappear in ~4-6 weeks.
Q: Do I need IVIG or PEX to cure PANDAS?
A: Most of the studies and certainly parents on this forum report that IVIG and PEX are helpful in putting PANDAS in remission, but don't "cure" PANDAS. There are many reports of PANDAS symptoms returning after re-exposure to GABHS. This is why many parents use long term prophylactic antibiotics. It is also important to mention that some parents report that antibiotics used aggressively at initial onset of symptoms seem to put PANDAS in remission.
Q: Is this a chronic condition or will IVIG and PEX fix what’s wrong?
A: We don't know. There is good anecdotal evidence that IVIG and PEX have both been effective at removing 50+% of symptoms and that these treatments with prophylactic followup antibiotics have kept patients in remission for > 1 year. It does appear, however, that the prophylactic antibiotics is critical as many have had a recurrence when their child has been re-exposed to GABHS.
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Treatment : Other
Q:I've read a lot about Ibuprofen, what can it do for my child?
A: Many parents report anecdotally that Ibuprofen (e.g., Advil, Motrin) seems to lessen symptoms. The exact reason is not known. Several recent papers indicate that this could be caused by reduced inflammation of the blood-brain barrier and thereby preventing the anti-neuronal antibodies from reaching neuronal tissue. For those interested in how T-cells cross the blood brain barrier and the effect of ibuprofen on ICAM-1 adhesion modules see
http://www.latitudes...art=#entry46222
Q:Where can I find a list of doctors in my area?
A: You can ask on this forum. We've collected some of the names of doctors others have seen here:
http://www.latitudes...?showtopic=5023
Q:Why shouldn't PANDAS be treated "like any other case of OCD or tics" like the NIMH website recommends?
A
ANDAS is thought to have a different cause than non-PANDAS OCD and tics. Research studies thus far indicate that children with PANDAS had higher behavioral activation rates on SSRIs see
http://mbldownloads....06PP_Murphy.pdf. Anti-psychotics have many serious side effects and there are not controlled studies on the use of these medications on children in the PANDAS subgroup. There has been studies of Cognitive Behavioral Therapy that has shown some efficacy with older PANDAS children; however, the main benefit raised in the report was that parents learned techniques for managing exacerbations. There are not controlled clinical studies on Exposure Response Prevention, but some parents on this forum have tried this technique. Anecdotal reports are mixed on the effectiveness for PANDAS children.
Q: What else should I do to keep my PANDAS child strep-free?
A: It is very important to test everyone in the household for GABHS. Many families have found that there is a someone else in the family (children and parents) with strep during an exacerbation. The positive individual often is asymptomatic and parents and doctors are often surprised when they come back positive. This individual needs to be treated to prevent reinfection of others. Antibiotics don't prevent colonization or infection, antibiotics slow down the infection but the immune system still responds. Be sure to check 2 weeks later to ensure the positive individual cleared.