{"id":11217,"date":"2022-09-06T18:52:49","date_gmt":"2022-09-06T18:52:49","guid":{"rendered":"https:\/\/todaysveterinarynurse.com\/?p=11217"},"modified":"2022-09-06T19:30:56","modified_gmt":"2022-09-06T19:30:56","slug":"nutrition-feline-hypertrophic-cardiomyopathy-and-the-role-of-nutrition","status":"publish","type":"post","link":"https:\/\/navc.sitepreview.app\/todaysveterinarynurse.com\/nutrition\/feline-hypertrophic-cardiomyopathy-and-the-role-of-nutrition\/","title":{"rendered":"Feline Hypertrophic Cardiomyopathy and the Role of Nutrition"},"content":{"rendered":"<p class=\"p1\"><span class=\"s1\"><b><div class=\"su-note\"  style=\"border-color:#d8d8d8;border-radius:3px;-moz-border-radius:3px;-webkit-border-radius:3px;\"><div class=\"su-note-inner su-u-clearfix su-u-trim\" style=\"background-color:#f2f2f2;border-color:#ffffff;color:#333333;border-radius:3px;-moz-border-radius:3px;-webkit-border-radius:3px;\">Abstract<\/b><\/span><\/p>\n<p class=\"p2\">Feline hypertrophic cardiomyopathy (HCM) is the most common heart disease in cats. This review article takes an in-depth look at the role of nutrition as part of effective multimodal management of HCM, examining specific nutrients that aid in improving the quality of life for cats with HCM. Effective treatment requires a multifaceted approach, of which therapeutic nutrition is an important component. The purpose of this article is to review the signs of HCM in feline patients, the tenets of a proper nutritional assessment, and the keys to creating dietary recommendations for cats with HCM.<\/p>\n<p class=\"p1\"><b>Take-Home Points<\/b><\/p>\n<ul>\n<li class=\"p2\">The most common heart disease in cats is hypertrophic cardiomyopathy (HCM), which is characterized by a gradual thickening and weakening of the heart muscle.<\/li>\n<li class=\"p2\">Disease-causing mutations have not been identified in most cats with HCM, except for the myosin-binding protein C mutation in Maine coon and ragdoll cats.<\/li>\n<li class=\"p2\">Management of cats with HCM is limited to a combination of medication and diet.<\/li>\n<li class=\"p2\">Optimizing the cat\u2019s body composition, preventing deficient or excessive intake of various nutrients, and avoiding nutritionally unbalanced diets may help to slow progression of disease and improve quality of\u00a0life.<\/li>\n<li class=\"p2\">In addition to diet, the veterinary team must ascertain if treats or supplements are being given. Cats may be eating a recommended therapeutic cat food but may also be receiving large amounts of sodium from treats or table food.<\/li>\n<li class=\"p2\">Ask owners how they administer medications to their cat, as this may reveal issues that result in too much of a certain nutrient or the unbalancing of a diet and are not understood by the owner.<\/li>\n<li class=\"p2\">The veterinary team should communicate the use of appropriate foods, such as the canned version of the therapeutic diet, to administer medications or provide as a\u00a0treat.<\/li>\n<li class=\"p2\">Reductions in food intake may indicate the need for dietary modifications but also may be an early sign of decompensation of the cardiac disease or the need for medication adjustment. Body weight, body condition score, and muscle condition score should be monitored carefully at every visit and the diet reassessed to ensure it remains optimal for the cat\u2019s stage of disease, laboratory values, and clinical signs.<\/li>\n<li class=\"p2\">Cardiac cachexia is a major concern in patients with cardiac disease. Recommend to pet owners that they feed patients a therapeutic food containing adequate calories and high-quality, highly digestible protein.<\/li>\n<li class=\"p2\">Veterinary nurses need to remind clients that pets should be offered unrestricted access to fresh, clean water.<span class=\"s1\"><b><\/div><\/div><\/b><\/span><\/li>\n<\/ul>\n<p>Heart disease is a common cause of illness in domestic cats, with up to 20% of the feline population estimated to be affected.<sup>1,2<\/sup> In addition, studies have found cardiac murmurs in roughly 20% of apparently healthy cats.<sup>3,4<\/sup> <span class=\"s1\">Cardiomyopathies are the principal cause of cardiovascular morbidity and mortality in cats, and hypertrophic cardiomyopathy (HCM) is the most common of these disorders.<\/span><sup>5,6<\/sup><\/p>\n<p class=\"p2\"><span class=\"s1\">HCM is characterized by a gradual thickening and weakening of the heart muscle. Left ventricular hypertrophy, impaired diastolic filling, and, often, secondary left atrial enlargement result. As the muscle thickens, there is less room for blood to fill the heart, and the muscle is less able to pump blood effectively as it weakens. There are 2 primary forms of HCM: A genetically linked form that is often early onset in breeds, such as Maine coons, ragdolls, rexes, and sphynxes, and a sporadic form that may occur in any cat at any age. <\/span><\/p>\n<p class=\"p2\"><span class=\"s1\">Congestive heart failure (<a href=\"https:\/\/todaysveterinarynurse.com\/cardiology\/unusual-congenital-heart-defects-in-dogs-and-cats\/\" target=\"_blank\" rel=\"noopener\">CHF<\/a>) and arterial thromboembolism (<a href=\"https:\/\/todaysveterinarypractice.com\/cardiology\/feline-arterial-thromboembolism\/\" target=\"_blank\" rel=\"noopener\">ATE<\/a>) are common clinical manifestations of HCM in cats, with ATE reportedly developing in up to 48% of affected cats.<sup>7,8<\/sup> The median survival time for cats with HCM is less than 2 years, with cats presenting for CHF or ATE having even shorter survival times.<sup>7,8<\/sup> Disease-causing mutations have not been identified in most cats with HCM, except for the myosin-binding protein C mutation in Maine coons and ragdolls.<sup>7,9,10<\/sup> At this time, management of cats with HCM is limited to a combination of medication and diet.<\/span><\/p>\n<h2 class=\"p3\">Signs of Hypertrophic Cardiomyopathy<\/h2>\n<p class=\"p2\"><span class=\"s1\">Early signs of heart disease in cats are easy to miss, as they are so subtle and nonspecific that they are rarely noticed by owners, if they exist at all. In addition, cats appear to know their own capabilities and limitations and thus restrict their level of activity, which can further mask clinical signs.\u00a0 A serious and life-threatening consequence of HCM is the formation of blood clots in the heart. These clots may result in a thromboembolism. <\/span><\/p>\n<h2 class=\"p3\">Risk for Hypertrophic Cardiomyopathy<\/h2>\n<p class=\"p2\"><span class=\"s1\">Certain breeds are predisposed to cardiomyopathies (<\/span><span class=\"s2\"><b>BOX 1<\/b><\/span><span class=\"s1\">), and 2 breeds\u2014Maine coons and ragdolls\u2014each have at least 1 identified genetic cause of HCM.<sup>9,10<\/sup> Risk factors for causing or complicating cardiovascular disease include breed, sex, obesity, renal disease, drug therapy, and endocrinopathies. <\/span><\/p>\n<p class=\"p2\"><span class=\"s1\">Heart disease in cats is seldom curable. Management is focused on medical and nutritional therapy.<\/span><\/p>\n<div class=\"su-box su-box-style-default\" id=\"\" style=\"border-color:#606060;border-radius:3px;\"><div class=\"su-box-title\" style=\"background-color:#939393;color:#FFFFFF;border-top-left-radius:1px;border-top-right-radius:1px\">BOX 1 Breeds Predisposed to Cardiomyopathies<sup>11<\/sup><\/div><div class=\"su-box-content su-u-clearfix su-u-trim\" style=\"border-bottom-left-radius:1px;border-bottom-right-radius:1px\">\n<ul>\n<li>Sphynx<\/li>\n<li>Norwegian forest cat<\/li>\n<li>American shorthair<\/li>\n<li>Scottish fold<\/li>\n<li>Persian<\/li>\n<li>Siamese<\/li>\n<li>Abyssinian<\/li>\n<li>Himalayan<\/li>\n<li>Birman<\/div><\/div><\/li>\n<\/ul>\n<h2 class=\"p3\">Nutritional Assessment<\/h2>\n<p class=\"p2\"><span class=\"s1\">The veterinary team should not wait until later stages of cardiac disease to begin nutritional management. Rather, <a href=\"https:\/\/todaysveterinarynurse.com\/nutrition\/veterinary-energy-calculations-and-proper-caloric-intake\/\" target=\"_blank\" rel=\"noopener\">nutritional therapy<\/a> should be instituted early to benefit the cat in the longer, more common, earlier stages of cardiac disease. Optimizing body composition, preventing deficient or excessive intake of various nutrients, and avoiding nutritionally unbalanced diets may help to slow progression of disease and improve quality of life. <\/span><\/p>\n<p class=\"p2\"><span class=\"s1\">A nutritional assessment aids in determining if specific modifications might benefit a cat with heart disease. The assessment includes an evaluation of the cat and its current diet and consists of a nutritional history, body weight, body condition score (BCS), and muscle condition score (MCS).<\/span><\/p>\n<h3 class=\"p4\">Nutritional History<\/h3>\n<p class=\"p2\"><span class=\"s1\">When taking the nutritional history, it is important to ask open-ended questions to facilitate discussion of everything the cat is being fed, including <a href=\"https:\/\/todaysveterinarynurse.com\/nutrition\/pet-treat-nutrition\/\" target=\"_blank\" rel=\"noopener\">treats<\/a> and supplements as well as the cat\u2019s regular diet. This information can uncover potential sources of excess nutrients. For example, a cat may be eating a recommended therapeutic cat food aimed at managing cardiac disease but may also be ingesting large amounts of sodium from treats or table food. One study showed that more than 30% of cats with heart disease received treats.<sup>12,13<\/sup> Asking owners about how they administer medications can reveal further issues (e.g., using high-sodium foods such as cheese or lunch meats to hide pills). <\/span><\/p>\n<h3 class=\"p4\">Body Composition<\/h3>\n<p class=\"p2\"><span class=\"s1\">Changes in body composition are common in cats with heart disease and can negatively affect the outcome and quality of life. BCS assessment should be performed at least weekly. Teaching the owner how to perform this assessment and report it to the veterinary team can facilitate careful monitoring.<\/span><\/p>\n<p class=\"p2\"><span class=\"s1\">The MCS\u00a0evaluates muscle mass. Cats can be very obese and have severe muscle loss. Conversely, cats can be thin but have normal muscle mass. Evaluation of muscle mass includes visual examination and palpation over the temporal bones, scapulae, lumbar vertebrae, and pelvic bones. Assessing MCS is important in cats with heart disease, as they primarily lose muscle and may develop cachexia, a complex syndrome characterized by severe, chronic, undesired, and progressive weight loss and muscle wasting, with or without loss of fat mass.<sup>14<\/sup> This syndrome is associated with an underlying disease, anorexia, inflammation, <\/span>insulin resistance, and increased lean muscle breakdown<span class=\"s1\">. The rate of loss of lean body mass with cardiac <a href=\"https:\/\/todaysveterinarynurse.com\/nutrition\/catabolism-in-the-critical-patient\/\" target=\"_blank\" rel=\"noopener\">cachexia<\/a> exceeds that attributable to anorexia alone and indicates excessive caloric expenditure caused by the increased work of respiration and elevated heart rate.<\/span><\/p>\n<h3 class=\"p4\">Monitoring and Adjustment<\/h3>\n<p class=\"p2\"><span class=\"s1\">Voluntary reductions in food intake by the cat may indicate the need for dietary modification but also may be an early sign of decompensation of the cardiac disease or the need for medication adjustment. Body weight, BCS, and MCS should be monitored carefully at every visit and the diet reassessed to ensure it remains optimal for the cat\u2019s stage of disease, laboratory values, and clinical signs. <\/span><\/p>\n<h2 class=\"p3\">Dietary Considerations in Managing Hypertrophic Cardiomyopathy<\/h2>\n<h3 class=\"p4\">Owner Education<\/h3>\n<p class=\"p2\"><span class=\"s1\">Managing a cat with HCM involves creating an overall dietary plan that supports the cat as well as the human\u2013animal bond. Because so many owners like to give their cats treats, it is important to include appropriate treats in the plan. Communicating the use of appropriate foods, such as the canned version of the therapeutic diet, to administer medications or provide as a treat is beneficial. It is also important to address the use of supplements with owners, who commonly consult the internet for alternative treatments for cardiac disease. The veterinary team must educate owners that dietary supplements do not require proof of safety, efficacy, or quality control before being marketed. Being familiar with various brands of supplements and having a plan to make recommendations based on a specific brand with researched and confirmed concentrations of the supplement in question can help owners who are seeking this kind of treatment for their pet.<\/span><\/p>\n<h3 class=\"p4\">Key Nutrients<\/h3>\n<p class=\"p6\"><b>Sodium and Chloride<\/b><\/p>\n<p class=\"p2\"><span class=\"s1\">Retention of sodium, chloride, and water is associated with CHF. Whereas healthy cats easily excrete excess sodium in their urine a few hours after ingestion, patients in early cardiac disease may lose this ability. As heart disease worsens and CHF develops, the ability to <\/span>excrete excess sodium is further diminished. Historically<span class=\"s1\">, sodium retention was primarily implicated in the pathogenesis of CHF and some forms of hypertension. Chloride may also act as a direct renal vasoconstrictor.<\/span><\/p>\n<p class=\"p2\"><span class=\"s1\">According to the National Research Council, the minimum recommended allowance for sodium and chloride in foods for adult cats is 0.068% and 0.096% dry matter (DM), respectively.<sup>15,16<\/sup> Sodium levels in foods designed to manage cats with cardiovascular disease should meet the recommended allowance but not exceed 0.3% DM. Recommended chloride levels are typically 1.5 times sodium levels. Avoiding excess sodium and chloride in cat foods is more difficult than in dog foods because ingredients used to meet the higher protein requirement of cats also contain sodium and chloride and thus increase the amount of these nutrients in cat food. <\/span><\/p>\n<p class=\"p6\"><b>Taurine<\/b><\/p>\n<p class=\"p2\"><span class=\"s1\">Taurine is an essential amino acid in cats, and taurine deficiency has been linked to myocardial failure in this species. However, the mechanism of heart failure in taurine-deficient cats is not well understood. Taurine may play a role in free radical inactivation, osmoregulation, and calcium modulation; it is known for its direct effects on contractile proteins.<sup>16<\/sup> Other factors may also contribute to the development of myocardial failure in cats with taurine deficiency. Therefore, a minimum recommended allowance for taurine\u20140.04% DM\u2014is necessary in cat foods.<sup>15,16<\/sup> Foods for cats with cardiovascular disease should contain levels of taurine at least 0.3% DM. Levels of taurine typically found in supplements that may be used in feline cardiovascular patients (250 to 500 mg taurine\/day) provide approximately twice that much.<sup>15,16<\/sup><\/span><\/p>\n<p class=\"p6\"><b>Phosphorus<\/b><\/p>\n<p class=\"p2\"><span class=\"s1\">Patients with cardiac disease often have concurrent disease conditions. It is understood that phosphorus is a nutrient of concern in patients with concurrent chronic kidney disease and that kidney disease is one of the more prevalent diseases seen concurrently with cardiac disease. The recommended amount of phosphorus in nutritional management of cardiac disease is 0.3% to 0.7% DM in cats.<sup>15,16<\/sup><\/span><\/p>\n<p class=\"p6\"><b>Potassium and Magnesium<\/b><\/p>\n<p class=\"p7\"><span class=\"s1\">Another concern in cardiac patients is the metabolism of potassium and magnesium. <a href=\"https:\/\/todaysveterinarypractice.com\/internal-medicine\/evaluation-and-management-of-the-hypokalemic-patient\/\" target=\"_blank\" rel=\"noopener\">Hypokalemia<\/a>, <a href=\"https:\/\/todaysveterinarypractice.com\/internal-medicine\/evaluation-and-management-of-the-hyperkalemic-patient\/\" target=\"_blank\" rel=\"noopener\">hyperkalemia<\/a>, and hypomagnesemia are all potential complications when medication therapy is introduced in patients with cardiovascular disease. Veterinary team members should be aware that potassium or magnesium homeostasis abnormalities can:<sup>16<\/sup><\/span><\/p>\n<ul>\n<li class=\"p8\"><span class=\"s1\">Produce cardiac dysrhythmias<\/span><\/li>\n<li class=\"p8\"><span class=\"s1\">Lessen myocardial contractility<\/span><\/li>\n<li class=\"p8\"><span class=\"s1\">Create profound muscle weakness<\/span><\/li>\n<li class=\"p9\"><span class=\"s1\">Potentiate adverse effects from cardiac glycosides and other cardiac drugs<\/span><\/li>\n<\/ul>\n<p class=\"p2\"><span class=\"s1\">The amounts of potassium and magnesium recommended for adult maintenance in cats (0.52% DM potassium, 0.04% DM magnesium) should be the minimum amounts included in nutritional management of CHF.<sup>15,16<\/sup><\/span><\/p>\n<p class=\"p6\"><b>Protein<\/b><\/p>\n<p class=\"p2\"><span class=\"s1\">Cardiac cachexia is a major concern in patients with cardiac disease. Many patients with cachexia present with concomitant disease (e.g., chronic kidney disease), which also significantly affects nutrient requirements. Profound anorexia enhances protein\u2013energy malnutrition in patients with cachexia. To help avoid cachexia, patients should be encouraged to eat a therapeutic food that contains adequate calories and high-quality, highly digestible protein.<\/span><\/p>\n<p class=\"p6\"><b>Omega-3 Fatty Acids<\/b><\/p>\n<p class=\"p2\"><span class=\"s1\">The cytokines tumor necrosis factor and interleukin-1 have been implicated as pathogenic mediators in cardiac cachexia. Fish oil has been shown to alter cytokine production, and research involving fish oil suggests fish oil\u2013mediated alterations in cytokine production may help dogs with CHF. It is believed that cachectic CHF patients may benefit from these alterations through omega-3 fatty acid supplementation.<sup>17<\/sup> Other effects of omega-3 fatty acids that help prevent cachexia may include improved appetite and antiarrhythmic effects. <\/span><\/p>\n<p class=\"p2\"><span class=\"s1\">Omega-3 fatty acids have other effects, such as the potential to alter immune function. This alteration may contribute to their cardiovascular effects. Omega-3 fatty acids also reduce platelet aggregation resulting from the production of thromboxane B5, which might be of benefit in cats with cardiac disease and those at risk for thrombus formation.<sup>16<\/sup> It is important to be mindful of this effect when using omega-3 fatty acids in animals with coagulopathies.<\/span><\/p>\n<p class=\"p2\"><span class=\"s1\">Additional studies and discussion are needed, but it is believed that dogs and cats with cardiac disease may benefit from omega-3 fatty acid supplementation. No optimal dose of omega-3 fatty acids has yet been established for humans, cats, or dogs. The current recommendation from veterinary nutritionists studying fatty acids and cardiac disease is a dose of 40 mg\/kg eicosapentaenoic acid (EPA) and 25 mg\/kg docosahexaenoic acid (DHA) for both dogs and cats.<sup>7,16<\/sup> To meet these levels, a manufactured food would need to contain between 80 and 150 mg\/100 kcal EPA + DHA, and the size of the pet and the amount of food consumed would need to be considered. <\/span><\/p>\n<p class=\"p2\"><span class=\"s1\">Fish oil supplements vary widely in the amount of EPA and DHA they contain; therefore, supplement recommendations should be made with caution. As with other supplements, the veterinary healthcare team should be familiar with various brands and plan to make a recommendation based on a specific brand with researched and confirmed concentrations of EPA and DHA.<\/span><\/p>\n<p class=\"p2\"><span class=\"s1\">The veterinary healthcare team should educate owners that most benefits of omega-3 fatty acids occur after peak plasma and tissue concentrations have been achieved. Although plasma concentrations may increase significantly in the first week of omega-3 fatty acid supplementation, 4 to 6 weeks are typically required to reach peak plasma concentrations. <\/span><\/p>\n<p class=\"p6\"><b>Water <\/b><\/p>\n<p class=\"p2\"><span class=\"s1\">Veterinary team members must remember to talk with clients about the importance of water for all pets and remind them that pets should be offered fresh, clean water ad libitum. Healthcare teams must also keep in mind that water quality varies considerably, even within the same community. Water can be a significant source of sodium, chloride, and other minerals. Veterinary healthcare teams should be familiar with the mineral levels in their local water supply. Water samples can be submitted to state or other government laboratories for analysis. Also, municipal water companies can be contacted to ask about mineral levels in local water supplies. Distilled water or water with less than 150\u00a0ppm sodium is recommended for patients with advanced heart disease.<sup>16<\/sup><\/span><\/p>\n<h2 class=\"p3\">Summary<\/h2>\n<p class=\"p2\"><span class=\"s1\">The most common heart disease in cats is HCM. Heart disease in cats is seldom curable, with management focused on medical and nutritional therapy. Good client communication is important for achieving desired outcomes in cats with cardiac disease. Discussion of diet; the role of specific nutrients, treats, table food, and dietary supplements; and effective medication administration is beneficial for both the owner\u2019s and the cat\u2019s quality of life. Educate the client regarding nutrition and the role it plays in managing HCM so that recommendations can address the cat\u2019s preferences, as well as the client\u2019s time, lifestyle, and financial limitations. <\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Nutritional intervention can play a role in improving the quality of life for cats with HCM.<\/p>\n","protected":false},"author":236,"featured_media":11011,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"iawp_total_views":0,"footnotes":""},"categories":[232],"tags":[145],"class_list":["post-11217","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-fall-2022","tag-peer-reviewed","column-nutrition_notes","clinical_topics-cardiology","clinical_topics-nutrition"],"acf":{"hide_sidebar":false,"hide_sidebar_ad":false,"hide_all_ads":false},"yoast_head":"<!-- This site is optimized with the Yoast SEO 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