Thiamine Deficiency in Cats: 14 Signs to Look For (Vet Answer)
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Thiamine deficiency, or vitamin B1 deficiency, is a clinical syndrome associated with vascular lesions and nerve damage caused by an insufficient concentration of this vitamin in a cat’s body. This deficit is due to insufficient intake of vitamin B1 (part of the B complex group) to the body's requirements.
It's predominant in cats that consume large amounts of raw fish because these contain a compound that destroys vitamin B1. Thiamine deficiency can also occur in cats that consume unsupplemented commercial food, cooked food, or certain raw meats. Additionally, gastrointestinal and liver diseases can lead to thiamine deficiency.
Vitamin B1 deficiency is quite rare in cats but can be life-threatening if the clinical signs are not recognized by their owners in time. For this reason, you should know the clinical signs of thiamine deficiencies if your cat has a poor diet or eats large amounts of raw fish.
What Is Thiamine Deficiency in Cats?
Thiamine, or vitamin B1, is a water-soluble vitamin (i.e., it dissolves in water) that is part of the B complex. It’s essential for your cat's body and has the following roles:
Thiamine may also have other functions that are not currently known, as it’s widely involved in a plethora of normal metabolic processes all around your pet’s body, in just about every body system. Cats cannot synthesize thiamine, so their diet must contain this vitamin. When the food that they consume is low in vitamin B1, thiamine deficiency occurs.
What Are the Causes of Thiamine Deficiency in Cats?
There are several mechanisms for a thiamine deficiency.
How Thiamine Deficiency Occurs in Cats
The 14 Signs to Look For in Thiamine Deficiency
Generally speaking, thiamine deficiency has three phases or stages: an induction stage, a critical stage, and a terminal stage. The signs during each stage as are follows:
The Induction Stage
The induction stage often occurs when a cat’s diet has been deficient in thiamine for a period of around 2 weeks.
Signs of the Induction Stage:
If your cat doesn’t receive veterinary care during the induction stage, they will proceed to the critical stage.
The Critical Stage
The critical stage occurs if the induction stage is ignored and your cat continues to deteriorate.
Signs of the Critical Stage:
Neurological signs generally have a rapid onset and precede vomiting. In some cases, tetraparesis with developed rigidity may also occur. This stage will eventually progress to the terminal stage.
The Terminal Stage
The terminal stage usually occurs if your cat has a thiamine deficiency for around a month or so, with no intervention or treatment.
Signs of the Terminal Stage:
The terminal stage is considered fatal within just a few days. Most cats will perish unless veterinary treatment begins immediately.
Thiamine Deficiency Diagnosis
The presumptive diagnosis is usually based on clinical signs and history. The most common way a diagnosis is usually made by vets is by assessing the response that deficient cats have when supplementing their diet with thiamine.
Other tests include a biochemical blood profile, a complete blood count, and urine analysis; however, these tests are usually somewhat inconclusive. A set of chest and abdominal X-rays can also be recommended, as it is part of the investigation (especially when vets want to rule out other health conditions with similar signs). In rare instances, an MRI might also be warranted.
If you are concerned or have questions about your cat's health, you can also speak to a vet from the comfort of your own home to help make a plan. They can determine when an in-clinic vet visit should be made.
Thiamine Deficiency Treatment
Treatment Includes:
Depending on your cat’s condition, they may be hospitalized for a period of time until they are stabilized and on the road to recovery. A veterinarian may opt for a feeding tube for your cat for a period of time and also prescribe them a critical care or liquid diet for a period of time.
If your cat’s deficiency was caused by issues such as those involving the liver or kidneys, the veterinarian would prescribe additional medications and therapies to address those ailments.
Thiamine Deficiency Prognosis
The prognosis of your cat, or the odds of their recovery, depend on the severity of their deficiency at the time of presentation to the veterinarian. Cats in the induction or critical phase generally have a more favorable prognosis when compared to cats that are presented in the terminal stage of the condition.
Conclusion
Thiamine deficiency can be life-threatening for cats if it is not diagnosed and treated in time. The causes of this deficiency are various underlying ailments or nutritional insufficiencies that lead to a low thiamine intake. Common clinical signs include lack of appetite, vomiting, and nervous signs, such as twitching, incoordination, and dilated pupils. If you suspect that your cat has a thiamine deficiency, you should promptly contact a veterinarian, as an earlier diagnosis offers a better chance of recovery.
Sources
The Role of Thiamine and Effects of Deficiency in Dogs and Cats - PMC
Outbreak of thiamine deficiency in cats associated with the feeding of defective dry food
Thiamine deficiency in a cat associated with the preservation of 'pet meat' with sulphur dioxide
Feline Hepatic Lipidosis - Digestive System - MSD Veterinary Manual
Featured Image Credit: Natata, Shutterstock
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Dr. Iulia Mihai, DVM MSc (Veterinarian)
Dr. Mihai is a vet with over 13 years of experience in laboratory, pet pathology, and cancer. She studied at the University of Agronomical Sciences and Veterinary Medicine of Bucharest, Romania (EAEVE member), where she worked in the laboratory of the faculty clinic after graduation. She has a master’s degree in equine and pet pathology and studied epithelial cancer for her Ph.D. Iulia has a passion for internal medicine and parasitology and started volunteering at the faculty’s clinic in her third year of college. She has worked in a couple of veterinary clinics over the years as an internal medicine specialist. She enjoys writing and teaching people about cat disease prevention, nutrition, behavior, and treatment.
