Typically, it is first seen in puppies from
4-10 months
of age but can be seen in older dogs. However
there is a form in older dogs more often called Granulomatous
Meningo-Encephalitis or GME. SRM is more likely to be treatable with
GME
sometimes being refractory to treatment and more likely to result in a
dog that
doesn’t respond well to treatment. Male
and female dogs are affected
equally. Left untreated the first episode may resolve within a
few days
but a relapse will probably occur within a few months. There are
two cases
where affected dogs develop seizures secondary to scarring
caused by the
condition and these were both cases which did not get diagnosed
straight away
and were weaned too quickly from steroids. This same type syndrome is also
seen in Boxers,
The cause of SRM is unknown at the moment. It is known to be an immune response but the trigger has not been identified. The immune response results in an intense inflammation of the blood vessels supplying the neurological system particularly the meninges (lining around the brain) and the cervical spinal cord (neck). The body is “attacking” its own cells and suppression of this is imperative in treatment. Dogs are very stoic and as such the owner may not be able to pinpoint initially exactly what is wrong just that the puppy is out of sorts. Often this is initially attributed to an injury or infection.
Bacterial meningitis, diskospondylitis, spinal tumor, lyme
disease and
cervical disc disease should be ruled out as the symptoms are very
similar to
SRM. X-rays will often be unremarkable
and lab work may show anemia, leukocytosis, neutrophilia,
hypoalbuminemia, and
alpha2 macroglobulinemia. The usual use of non steroidal
anti-inflammatories
such as meloxicam and carprofen does not produce any improvement.
Antibiotics
are usually of no benefit to a beagle with SRM.
Diagnosis is most commonly based on symptoms and a spinal tap. Samples are taken under a General Anesthetic from the fluid bathing the cervical spinal cord and they show typical changes of increased numbers of cells and protein. The recent use of the Magnetic Resonance Imaging technique (MRI) is also producing very useful information on the condition, giving an idea of the severity of the disease in an individual and helping to decide on the best treatment regime. Some dogs may have an apparently normal spinal tap but the MRI scans show abnormalities consistent with the inflammation within the brain. MRI scans have the advantage of being completely safe. Spinal taps and MRIs are expensive. Ideally, both tests should be performed. In some cases testing may not be readily available or affordable to the owners. Recent studies has shown the evaluating of C-Reactive protein levels may be done in lieu of MRI. Also the ongoing assessment of C-reactive protein levels may be indicators in treatment response. Some owners and veterinarians have opted to start high dose steroid treatment and see if the dog responds quickly--if so additional testing was not done.
Treatment is with steroids, specifically prednisolone or prednisone at dosages between 1-4mg/kg/day. A protocol used by Dr. Samantha Goldberg is to start on 2mg/kg twice daily and after 5-7 days slowly start weaning down. Then maintain the patient on twice weekly 5mg for a few months when they have been badly affected and this will often hold them until they are older. Some dogs may grow out of the condition but others may have to stay on steroids permanently. In more severe cases other immunosuppressive agents, such as Azathiorpine or Cytarabine maybe used in conjunction with corticosteroid steroid therapy.
The main goal is to start treatment quickly and with adequate dosages. High steroid treatment should be first line treatment. Weaning off the medication should be done gradual, as cases have shown that relapses may occur quickly if the steroid therapy is discontinued to rapidly. Do not start weaning until the dog is totally back to normal. Treat aggressive- wean slow!!
Steroid treatment will make the dog drink more water and may cause water retention. The side effects of the treatment (excessive eating, drinking and urinating including numerous "accidents”) can be overwhelming to the average pet owner. Frequent trips for "potty" breaks are needed, as well as keeping the beagle in a quiet non-stimulating environment. Remember that moving can be painful for them, so if the dog lives in an active household with kids and other dogs, confining the dog in a crate or separate area for is suggested.
Given that some breeds of dog are over represented in the population with SRM there is a possibility of a genetic predisposition which basically means the dog may have a hereditary problem which makes them more likely to develop this immune mediated disease. The availability of DNA marker tests for screening of canine disease is a major research area. The information from the UK on SRM can be found on this link
If you have a dog affected with SRM, please consider submitting a DNA swab via the (CHIC) -Canine Health Information Center DNA Banking program. For additional information on how submit cheek swabs of an affected beagle, please contact Darlene Stewart at beagleinfo@mchsi.com or review the information on the CHIC website. http://www.caninehealthinfo.org/Here are websites with links to additional information on this syndrome.
Bernese Mountain Dog Health Links http://www.bestbeau.ca/bmd_health_links_6.htm#MENINGITIS
University of
Dr. Roughie’s Questions and
Answers-Steroid
Responsive Meningitis-Vasculitis: The Disease With Many Names Kasmin D. Bittle DVM
http://www.pbgv.org/images/Health/Dr-Roughie-ST-Column/Meningitis.pdf
Neck Pain by Dr. J.E. Dillberger
http://www.pbgv.org/images/Health/Dr-Roughie-ST-Column/NeckPain.pdf
REFERENCES:
Steroid Responsive Meningitis - Samantha
Goldberg BVSc MRCVS
Neck Pain and Fever in a Boxer--NAVA Clinician's Brief, November 2009
The Five Minute Veterinary Consult Page 388,
J AM Vet Med Assoc 201[10]:1553-8 Nov 15'92--Systemic Necrotizing
Vasculitis in
Nine Young Beagles.
J Vet Inter Med 4[2]:112 Mar/Apr'90 ACVIM 8th Annual Forum--Systemic
Vasculitis
{Canine Pain Syndrome} in young beagles
J Vet Intern Med 2[1]:26-35 Jan/Mar'88 123 Refs--Canine Meningitis:A
Changing
Emphasis
The Veterinary Record, June 17, 1978--Polyarteritis in a colony of
beagles.
The Veterinary Record, April 7th 1973--Polyarteritis in the Dog: A Case
Report Dr. Roughie’s Questions and Answers-Steroid
Responsive Meningitis-Vasculitis: The Disease With Many Names Kasmin D. Bittle DVM www.pbgv.org/images/Health/Dr-Roughie-ST-Column/Meningitis.pdf
Neck Pain By Dr. J. E.
Dillberger,
www.pbgv.org/images/Health/Dr-Roughie-ST-Column/NeckPain.pdf