Milly Gaines
Struvite stones, a type of hard mineral deposit, can form in the kidneys of humans and animals. These stones are composed of struvite, a mineral produced by bacteria in the urinary tract. Diet can play a role in dissolving struvite stones, especially in cats and dogs. Therapeutic diets that are low in protein, magnesium, and phosphorus can help dissolve struvite stones by promoting the formation of acidic urine. In cats, struvite stones can be dissolved in a few weeks by feeding them a diet that generates a urinary struvite relative supersaturation (RSS) of less than 1. For dogs, the length and type of treatment may vary, and dietary changes are usually accompanied by the treatment of urinary tract infections.
| Characteristics | Values |
|---|---|
| Diet type | Therapeutic, low-magnesium, urine-acidifying, struvite dissolution or prevention |
| Diet contents | Restricted protein, phosphorus, and magnesium |
| Diet goals | Promote formation of acidic urine (pH less than 6.5) |
| Time to dissolve stones | 1-3 weeks, 2-3 months, or 12 weeks |
| Effectiveness | 100% effective in cats |
| Risk factors | High urine pH (>6.5), concentrated urine, alkaline urine, urinary tract infections |
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What You'll Learn
Therapeutic diets for struvite dissolution in cats
Therapeutic diets are an effective way to dissolve struvite crystals in cats. These diets are formulated to create a urine environment that is less favourable for the formation of struvite bladder stones. The urine pH is decreased, and the levels of magnesium, ammonium, and phosphorus are restricted. Additionally, it is important to increase water intake to dilute the urine and make it less concentrated.
There are both dry and canned therapeutic food options available. Dry food can be ideal for cats that normally drink plenty of water, while canned food can be a better option for cats that need help staying hydrated. Canned food improves water intake, making the urine less concentrated. However, most cats prefer canned food over dry food with added water. It is important to note that dissolution diets work best when no other foods are given, as even treats can hinder the effectiveness of the diet.
The length of the therapeutic diet will vary depending on the size and number of stones, but they typically dissolve within one to three months. Radiographs are used to monitor the progress and ensure the stones are shrinking. Once the stones have dissolved, it is recommended to continue the diet for at least 30 days to prevent recurrence.
It is important to consult a veterinarian before starting a therapeutic diet, as there may be alternative removal strategies if the stones are not struvite. Additionally, a urinary tract infection may be present, which would require antibiotic therapy alongside the diet.
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Dietary management for struvite dissolution in dogs
Diet plays a significant role in the treatment and prevention of bladder stones in dogs. Struvite crystals are a common type of crystal found in dogs, and when combined with urease, they form struvite stones, which can lead to bladder infections.
To dissolve struvite stones, a therapeutic diet is typically recommended, which may be accompanied by the treatment of an underlying urinary tract infection (UTI). These diets are usually short-term and are designed to acidify the urine, making it a less welcoming environment for struvite crystals to form and promoting their dissolution. The diets are also restricted in protein, phosphorus, and magnesium.
Veterinary therapeutic diets that are low in protein and sodium are often recommended to dissolve cystine stones. To prevent the recurrence of cystine stones, a high-protein diet is recommended, particularly one abundant in methionine, which can be found in meat, eggs, wheat, and peanuts.
It is important to note that dietary changes may not be enough to dissolve all types of bladder stones, and in some cases, surgery or other methods of physical removal, such as lithotripsy or urohydropropulsion, may be necessary.
Additionally, increasing water intake is crucial in the management of bladder stones. Water helps to dilute the urine and increase urine flow, making it more difficult for stones to form.
When creating a dietary plan for a dog with bladder stones, it is essential to consult with a veterinarian to tailor the diet to the dog's specific needs, the type of stones they are prone to, and their overall health condition. Regular check-ups and monitoring are also necessary to ensure the dietary plan's effectiveness and make any required adjustments.
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The impact of urine pH on struvite crystal formation
Struvite is a mineral that's produced by bacteria in the urinary tract. It is a common component of dog urine and will remain dissolved as long as the urine is acidic and not too concentrated. However, if the urine becomes very concentrated or alkaline, struvite crystals will form.
In cats, struvite stones are most often sterile and not associated with bacterial infection, although infection-induced struvite stones may be seen in young or old cats. Nutritional factors, including high dietary magnesium, phosphorus, and protein concentrations that cause aciduria, decrease the risk of sterile struvite stones.
Therapeutic diets are often recommended to dissolve struvite bladder stones in dogs and cats. These diets are typically restricted in protein, phosphorus, and magnesium, and are formulated to promote the formation of acidic urine with a pH less than 6.5. Canned food is preferable to dry food as it improves water intake, making the urine less concentrated.
It is important to note that dietary management alone may not be effective in preventing struvite stones, as they are primarily caused by infections. However, certain fluids can make the environment in the urinary tract less favourable for stone growth. Drinking enough water and other fluids to produce 2 quarts of urine daily is recommended.
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The role of dietary magnesium in struvite dissolution
Struvite is a mineral that’s produced by bacteria in the urinary tract. It is a common component of dog urine and will remain dissolved as long as the urine is acidic and not too concentrated. However, if the urine becomes very concentrated or alkaline, struvite crystals will form.
In cats, struvite calculi are most often sterile and not associated with bacterial infection. Nutritional factors, including high dietary magnesium, phosphorus, and dietary protein concentrations that cause aciduria, decrease the risk of sterile struvite calculi. The addition of magnesium and phosphate to the diet causes disease in some cats, and a reduction of dietary magnesium reduces the incidence of struvite.
In dogs, struvite bladder stones usually form as a complication of a bladder infection caused by bacteria that produce the enzyme urease. The treatment for struvite bladder stones in dogs often includes a special diet to dissolve the stones, which is typically restricted in protein, phosphorus, and magnesium, and formulated to promote the formation of acidic urine.
While therapeutic diets are effective for cats and dogs, the length and type of treatment vary. In dogs, the use of a therapeutic diet is typically short-term and accompanied by the identification and treatment of a UTI. In cats, struvite uroliths can be dissolved in about one to three weeks with a therapeutic diet.
Overall, dietary magnesium plays an important role in struvite dissolution, as reducing dietary magnesium can help reduce the incidence of struvite formation, especially in cats.
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The effectiveness of dry vs. wet diets for struvite dissolution
A struvite relative supersaturation of less than 1 is effective in dissolving struvite stones in cats. A study found that both wet and dry test diets induced a struvite urinary relative supersaturation (RSS) of less than 1, resulting in the dissolution of feline struvite stones. Out of the seventeen cats with complete dissolution, eight were fed the wet diet and nine were fed the dry diet. The study concluded that there was no significant effect of the form of diet on the time of dissolution.
Therapeutic diets for struvite dissolution are available in both canned (wet) and dry varieties. Wet food improves water intake, making urine less concentrated and reducing the saturation of calculogenic compounds. This makes it a desirable option for stone prevention. However, dry diets are also effective in dissolving struvite stones, as demonstrated by the study.
For dogs, struvite bladder stones usually form as a complication of a bladder infection caused by bacteria that produce an enzyme called urease. The response of struvite calculi to medical or dietary manipulations in dogs is somewhat refractory due to the presence of associated hydroxyl apatite and concentric laminations, which have low porosity. The length and type of treatment for struvite dissolution vary between cats and dogs. In dogs, the use of a therapeutic diet is typically short-term and accompanied by the identification and treatment of a urinary tract infection (UTI).
It is important to note that not all struvite dissolution diets contain adequate nutrients for long-term feeding, and they are not suitable for young animals or pregnant or lactating female dogs. Therefore, it is recommended to consult with a veterinarian to determine the appropriate diet and treatment plan for struvite dissolution in cats and dogs.
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Frequently asked questions
A therapeutic diet that promotes the formation of acidic urine with a pH of less than 6.5 can help dissolve struvite crystals. This involves restricting protein, phosphorus, and magnesium intake.
A therapeutic diet can make the urine less welcoming for stone formation and dissolve existing stones. It is important to note that dietary management alone may not be effective in preventing struvite stones as they are often caused by infections.
The time it takes for a diet to dissolve struvite crystals can vary. In dogs, struvite stones can dissolve in as little as two weeks or as long as three months. In cats, struvite uroliths have been found to dissolve in a median time of 19 and 16 days for dry and wet diets, respectively.
Dry and canned therapeutic foods are available and have been found to be effective in dissolving struvite uroliths. Canned food is preferable due to its high moisture content, which helps to dilute urine and create an environment less conducive to stone formation.
Yes, it is important to note that not all dissolution diets contain adequate nutrients for long-term feeding. These diets are typically restricted in protein, magnesium, and phosphorus, which are essential nutrients. Therefore, they should only be used short-term under the guidance of a veterinarian.
