TRH test marked elevation in Fall
Hi there. I have a 16yr QH gelding that has always had a cresty neck and fat pockets behind his shoulders. Even in heavy work and when fit. He has been on pasture and a ration balancer. He was normal on baseline ACTH and insulin levels in March 2020. He looked a little more crestu and has been acting footsore some days that comes and goes and not improving with rest, adequan and joint injections. I was going to retest him this fall but this was hastened by him. He has had some SI issues and had PRP for this and recheck with his vet this Tues. He was looking really good the past weeks leading up to it although I did occasionally see him toe pointing on the RF and once was standing parked out while tied but moved normally when lounged.
The barn moved him the morning of the recheck to a new pasture. He was on it for about an hour. When I came to get him he was tripping some and off on both forefeet solid 3/5 at trot on a tight circle but looked okay straight and walking normally. By the time we trailered to the vet about an hour away, he looked great. They pulled Cushings test while there to be safe and called me and said, start Prascend today and get him off the grass immediately. This clinic said start at 1tab a day but his usual vet said do 1/2 tab for two weeks before increasing to avoid side effects. His values are ACTH base 46, after stim 1118 Insulin 48 uU/ml Glucose 89 mg/dl He looks fine today, no lameness, normal digital pulses. I am following their recommendation but from what I found on this group I am unclear about these results. With the stim that high is he Cushings despite the baseline? The reference lab said over 500 in the fall was diagnostic.
Should I start him at a full tab or do the 1/2 tab recommendation? We are doing the diet changes recommended for insulin resistance. He had hoof rads two months ago but my vet is coming out to reshoot them this coming Tues to make sure nothing is changing and recheck to make sure this isn't navicular or something. Thanks for any advice! Melody Brandywine, MD Joined Sept 2022 |
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Sherry Morse
Hello Melody, Welcome to the group! You mentioned that your gelding "was normal on baseline ACTH and insulin levels in March 2020" - do you happen to know what those actual numbers are? Has he been retested since then other than the test you mentioned (more on that in a moment)? Fad pads and a cresty neck are both hallmarks of IR and for these horses we recommend a very strict diet and monitoring bloodwork on at least a yearly basis. Pasture and most commercial ration balancers are not an appropriate diet for these horses - more on that in the DIET section below. Acting footsore can have many causes and again, this is where knowing actual insulin numbers are important. Horses can start showing signs of sub-clinical laminitis with insulin levels of 50 or above but over 80 they are almost always going to be laminitic in some form. At this time of year we are in the seasonal rise and ALL horses will have an elevated ACTH level. It's horses who have an extreme elevation who are PPID. There are several issues with the way the testing was done at your vets. 1 - we do not recommend testing after trailering as this can cause an elevation in test results for both insulin and ACTH, 2 - the TRH Stim test (which is what was performed on your horse) is not reliable during the seasonal rise. It is possible your horse is early PPID which is why his initial blood draw was in range for this time of year but the 10 minute number was so high; but again it's hard to say since he was also trailered. As far as the insulin number - that is definitely abnormal but how much is hard to say since he was trailered and we don't know when he ate in relation to the blood draw. Regardless I would treat him as IR until you can have blood pulled at home. Were this my horse I wouldn't start him on Prascend until you can redo the TRH Stim test in January at home. If you do decide to start him on the medication you can titrate up in 4 day increments starting with a half a mg. We do recommend using APF if you think he might have an issue with the veil. (More on that under the TREATMENT section below). What follows is our very long welcome message - there's a lot of information in it so let us know if you have any questions after reading it. The ECIR Group provides the best, most up to date information on Cushing's (PPID) and Equine Metabolic Syndrome (EMS)/Insulin Resistance (IR). Please explore our website where you'll find tons of great information that will help you to quickly understand the main things you need to know to start helping your horse. Also open any of the links below (in blue font) for more information/instructions that will save you time. Have you started your Case History? If you haven't done so yet, please join our case history sub-group. We appreciate you following the uploading instructions so your folder is properly set up with the documents inside. Go to this CH message with info on how to use various devices and forms. If you have any trouble, just post a message to let us know where you are stuck. Orienting information, such as how the different ECIR sections relate to each other, message etiquette, what goes where and many how-to pages are in the Wiki. There is also an FAQs on our website that will help answer the most common and important questions new members have. Below is a general summary of our DDT/E philosophy which is short for Diagnosis, Diet, Trim and Exercise.
DIAGNOSIS: There are two conditions dealt with here: Cushings (PPID) and Equine Metabolic Syndrome (EMS)/Insulin Resistance (IR). These are two separate issues that share some overlapping symptoms. An equine may be either PPID or EMS/IR, neither or both. While increasing age is the greatest risk factor for developing PPID, IR can appear at any age and may have a genetic component. Blood work is used for diagnosis as well as monitoring the level of control of each. PPID is diagnosed using the Endogenous ACTH test, while EMS/IR is diagnosed by testing non-fasting insulin and glucose. The fat-derived hormone leptin is also usually abnormally elevated in insulin resistance but because there are many other things which can lower or increase leptin ECIR is not recommending routine testing for this hormone. Leptin is the hormone that says "stop eating". In Europe, adiponectin is tested instead of leptin. Adiponectin helps regulate glucose and fat burning, and maintain insulin sensitivity. Low levels are associated with EMS. It has come to be preferred over leptin because it is not influenced by things like weight or exercise, and also because it was the only factor other than insulin levels that predicted laminitis risk *Before calling your vet to draw blood for tests, we suggest saving time and wasted money by reading these details and then sharing them with your vet so that everyone is on the same page regarding correct testing and protocols. *Please remember to request copies of the results of all the tests done rather than just relying on verbal information. Your vet should be able to email these to you. If you have previous test results, please include those as well. All should go in your CH, but if you are having any trouble with the CH, just post in the messages for now. Treatment: EMS is a metabolic type - not a disease - that is managed with a low sugar+starch diet and exercise (as able). The super-efficient easy keeper type breeds such as minis, ponies, Morgans, Arabs, Rockies are some of the classic examples. PPID is a progressive disease that is treated with the medication pergolide. Some, but not all, individuals may experience a temporary loss of appetite, lethargy and/or depression when first starting the medication. To avoid this "pergolide veil" (scroll down for side effects), we recommend weaning onto the drug slowly and the use of the product APF. The best long term results are seen when the ACTH is maintained in the middle of the normal range at all times, including during the annual seasonal rise. To accomplish this, the amount of medication may need to increase over time. Neither condition is ever "cured", only properly controlled for the remainder of the equine's life. If your partner is both PPID and IR then both medication and diet management will be needed. DIET: Almost all commercial feeds are not suitable - no matter what it says on the bag. Please see the International Safe Feeds List for the safest suggestions. No hay is "safe" until proven so by chemical analysis. The diet that works for IR is:
We use grass hay, tested to be under 10% ESC + starch, with minerals added to balance the excesses and deficiencies in the hay, plus salt, and to replace the fragile ingredients that are lost when grass is cured into hay, we add ground flax seed and Vitamin E. This diet is crucial for an EMS/IR horse, but also supports the delicate immune system of a PPID horse. *Until you can get your hay tested and balanced we recommend that you soak your hay and use the emergency diet (scroll down for it). The emergency diet is not intended for long term use, but addresses some of the most common major deficiencies. Testing your hay and getting the minerals balanced to its excesses and deficiencies is the best way to feed any equine (look under the Hay Balancing file if you want professional help balancing). If you absolutely cannot test your hay and balance the minerals to it, or would like to use a "stop gap" product until you get your hay balanced, here's a list of "acceptable" ration balancers. There is a lot of helpful information in the start here folder so it is important you read all the documents found there. The emergency diet involves soaking your untested hay for an hour in cold water or 30 minutes in hot water. This removes up to 30% of the sugar content, but no starch. Starch is worse than sugar since it converts 100% to glucose while sugar only converts 50%, so starch causes a bigger insulin spike. Make sure you dump the soaking water where the equine(s) can't get to it. What you don't feed on the EMS/IR diet is every bit as, if not more important than, what you do feed! No grass. No grain. No sugary treats, including apples and carrots. No brown/red salt blocks which contain iron (and sometimes molasses) which interferes with mineral balancing, so white salt blocks only. No products containing molasses. No bagged feeds with a combined sugar and starch of over 10% or starch over about 4%, or fat over about 4%. Unfortunately, even bagged feeds that say they are designed for IR and/or PPID equines are usually too high in sugar, starch and/or fat. It’s really important to know the actual analysis and not be fooled by a name that says it is suitable for EMS/IR individuals. We do not recommend feeding alfalfa hay to EMS/IR equines as it makes many of them laminitic. Although it tends to be low in sugar, many times the starch is higher and does not soak out. Additionally, protein and calcium are quite high, which can contribute to sore footedness and make mineral balancing very difficult. TRIM: A proper trim is toes backed and heels lowered so that the hoof capsule closely hugs and supports the internal structures of the foot. Though important for all equines, it's essential for IR and/or PPID equines to have a proper trim in place since they are at increased risk for laminitis. After any potential triggers are removed from the diet, and in PPID individuals, the ACTH is under control, the realigning trim is often the missing link in getting a laminitic equine comfortable. In general, laminitic hooves require more frequent trim adjustments to maintain the proper alignment so we recommend the use of padded boots rather than fixed appliances (i.e. shoes, clogs), at least during the initial phases of treatment. Sometimes subclinical laminitis can be misdiagnosed as arthritis, navicular, or a host of other problems as the animal attempts to compensate for sore feet. You are encouraged to make an album and post hoof pictures and any radiographs you might have so we can to look to see if you have an optimal trim in place. Read this section of the wiki for how to get a hoof evaluation, what photos are needed, and how to get the best hoof shots and radiographs. EXERCISE: The best IR buster there is, but only if the equine is comfortable and non-laminitic. An individual that has had laminitis needs 6-9 months of correct realigning trims before any serious exercise can begin. Once the equine is moving around comfortably at liberty, hand walking can begin in long straight lines with no tight turns. Do not force a laminitic individual to move, or allow its other companions to do so. It will begin to move once the pain begins to subside. Resting its fragile feet is needed for healing to take place so if the animal wants to lay down, do not encourage it to get up. Place feed and water where it can be reached easily without having to move any more than necessary. Be extremely careful about movement while using NSAIDs (bute, banamine, previcox, etc.) as it masks pain and encourages more movement than these fragile feet are actually able to withstand. Additionally, NSAIDs (and icing) do not work on metabolic laminitis and long term NSAID use interferes with healing. Therefore, we recommend tapering off NSAIDs after the first week or so of use. If after a week's time your equine's comfort level has not increased, then the cause of the laminitis has not been removed and keeping up the NSAIDs isn't the answer - you need to address the underlying cause.
There is lots more information in our files and archived messages and also on our website. It is a lot of information, so take some time to go over it and feel free to ask any questions. If you are feeling overwhelmed, don't worry, you will catch on, and we are always here to help you! Once you have your case history uploaded, we can help you help your equine partner even better. If you have any technical difficulties, please let us know so we can help you.
Thanks, Sherry and Scutch (and Scarlet over the bridge) EC Primary Response PA 2014 https://ecir.groups.io/g/CaseHistory/files/Sherry%20and%20Scutch_Scarlet https://ecir.groups.io/g/CaseHistory/album?id=78891 |
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Melody Rose
Thanks for the response. He was only tested the one other time in April 2020 and his baseline ACTH was 10.7 and baseline insulin 12.7.
If we do not start pergolide now, would it contribute to making our suspected IR harder to control? I wanted him retested this year anyways because his summer coat was a little thicker than normal and on hot days I would find him sweating on his neck and chest when he was just out in the field. He has also had insect allergies and given himself an eye ulcer once with rubbing his face so badly. We had been putting a mask on him which helped but reading here it looks like those could be early signs of endocrine issues for him. Would it be safer to just it him on pergolide for now and then wean off and retest later? How exactly do we go about doing that? The internist at the clinic acknowledged they don't like to interpret tests post trailer but that the stim result was so remarkably high combined with his clinic sign they felt it likely there was some truth to it and you wouldn't be able to get that much of a rise just from trailering etc -- Melody Brandywine, MD Joined Sept 2022
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Hi Melody,
You can start him on pergolide to be on the safe side, especially if you have seen physical signs that support PPID. Despite everything, that is still a very high TRH result. Howecer, it's so late into the seasonal rise that a dose of 1mg is unlikely to take much effect until after the rise ends, but it may help. That's why we recommend getting the effective dose in place in late July, so for future reference next year... In the meantime, insulin is the biggest concern. With an insulin of ~50 I would start soaking the hay, which can help offset the effect of high ACTH on insulin through the rise. After December, you can stop the pergolide, wait for 3 weeks so his ACTH can return to his normal, then redo the TRH Stim at home. -- Kirsten and Shaku (IR + PPID) - 2019 Kitimat, BC, Canada ECIR Group Moderator Shaku's Photo Album |
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I should add, no pasture right now when insulin is high, and you may need to do a diet overhaul to help lower that insulin. See the Diet section of Sherry's welcome letter.
My horse was diagnosed early PPID in November 2020, so he went through that seasonal rise unmedicated. I had to soak his hay through that seasonal rise to prevent laminitis, which kept his insulin nice and low, and the 2 times I stopped soaking (Aug 2020 and Nov 2020) he had a flareup. What he really needed was pergolide, but we didn't start that until March 2021. Getting pergolide started allowed me to stop having to soak that hay the next seasonal rise (he was eating the same hay both years, so that variable didn't change). -- Kirsten and Shaku (IR + PPID) - 2019 Kitimat, BC, Canada ECIR Group Moderator Shaku's Photo Album |
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Sherry Morse
Hi Melody, Well this is additional information which is one of the reasons we like to have a case history so we can see the whole picture. Knowing his current diet would also be helpful. As his insulin wasn't in the danger zone for laminitis even with trailering I would still be hesitant to start on medication without a retest once we are fully out of the seasonal rise (January) and I would concentrate on getting his diet correct and his trim in order between now and then. If you do decide to start on medication you would titrate up over 4 days for each increase and then to wean off you would stop the medication and then wait 3 weeks to retest in January. That test should be done at home following the guidelines in your welcome message.
Thanks, Sherry and Scutch (and Scarlet over the bridge) EC Primary Response PA 2014 https://ecir.groups.io/g/CaseHistory/files/Sherry%20and%20Scutch_Scarlet https://ecir.groups.io/g/CaseHistory/album?id=78891 |
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