{"id":30274,"date":"2024-03-12T15:23:13","date_gmt":"2024-03-12T15:23:13","guid":{"rendered":"https:\/\/todaysveterinarynurse.com\/?p=30274"},"modified":"2024-04-05T18:35:55","modified_gmt":"2024-04-05T18:35:55","slug":"protein-losing-diseases-and-anesthesia","status":"publish","type":"post","link":"https:\/\/navc.sitepreview.app\/todaysveterinarynurse.com\/protein-losing-diseases-and-anesthesia\/","title":{"rendered":"Protein-Losing Diseases and Anesthesia"},"content":{"rendered":"<div class=\"su-spacer\" style=\"height:20px\"><\/div><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;\"><b>Abstract<\/b><\/p>\n<p class=\"p1\">Protein-losing diseases are common in dogs and cats. They are generally categorized as 2 different syndromes: protein-losing enteropathy (PLE) and protein-losing nephropathy (PLN). These diseases have multiple effects, including gastrointestinal tract and kidney dysfunction, decreased serum proteins, cachexia, increased blood pressure, and coagulopathies. Proper diagnosis of PLE and PLN requires patients to undergo anesthesia for advanced diagnostics such as biopsy and endoscopy; however, the comorbidities these patients present with can make anesthesia challenging. This article describes how protein-losing diseases affect the patient, common comorbidities and how to address them, and how to prepare and create an anesthetic plan for these patients.<\/p>\n<p><b>Take-Home Points <\/b><\/p>\n<ul>\n<li class=\"p1\">Patients with protein-losing enteropathy (PLE) or protein-losing nephropathy (PLN) can be challenging to anesthetize due to low serum protein levels, hypercoagulability, pleural and\/or peritoneal effusion, and low body condition score.<\/li>\n<li class=\"p1\">Albumin, the serum protein responsible for maintaining oncotic pressure and for drug binding and metabolism, is the serum protein most commonly lost in PLE and PLN.<\/li>\n<li class=\"p1\">Patients with serum albumin lower than 2 g\/dL are likely to have edema, ascites, and\/or pleural effusion.<\/li>\n<li class=\"p1\">With a custom-tailored anesthesia protocol, a PLE or PLN patient can be safely anesthetized.<\/li>\n<\/ul>\n<\/div><\/div>\n<p class=\"p1\"><span class=\"s1\">P<\/span><span class=\"s2\">rotein-losing diseases are common in dogs and cats. They primarily affect 2 body systems: the gastrointestinal (GI) tract (protein-losing enteropathy [PLE]) or the renal system (protein-losing nephropathy [PLN]). These disease processes affect the body in different ways, and both require advanced diagnostics for diagnosis. Anesthetizing these patients for diagnostic procedures can be challenging and requires certain considerations to be taken. <\/span><\/p>\n<h2 class=\"p3\">Overview of Protein-Losing Enteropathy<\/h2>\n<p class=\"p2\"><span class=\"s2\">PLE is an umbrella term for protein loss caused by a plethora of diseases\u2014inflammatory, infectious, or neoplastic\u2014that affect the GI tract. Technically speaking, any disease that prevents the GI tract from properly absorbing nutrients and proteins can cause PLE. Most patients present with vomiting, diarrhea, and weight loss; however, they may lack one or all of these clinical signs. <\/span><\/p>\n<p class=\"p2\"><span class=\"s2\">In PLE, protein is not absorbed from the GI tract, resulting in the loss of the serum proteins albumin and globulin. Albumin is responsible for keeping fluid within the blood vessels and contributing to intravascular oncotic pressure. If loss of serum albumin is significant (albumin &lt;<\/span><span class=\"s3\">\u2009<\/span><span class=\"s2\">2 g\/dL), patients can present with ascites, ventrum and limb edema, and pleural effusion (with or without respiratory distress). Globulins, which are larger molecules than albumin, are made up of antibody molecules, clotting factors, and carrier proteins. High globulin levels usually indicate inflammation or infection. However, because patients with PLE can present with high, low, or normal globulin levels, albumin is typically the protein of interest when a diagnosis of PLE is being considered. Patients with PLE also lose antithrombin and clotting factors from the intestines and can be prone to hypercoagulation and pulmonary thromboembolism.<sup>1,2<\/sup> Patients with PLE often must undergo anesthesia for <\/span>upper and lower GI endoscopy with biopsy, laparoscopic<span class=\"s2\"> GI biopsy, or abdominal laparotomy for GI biopsies.<\/span><\/p>\n<h2 class=\"p3\">Overview of Protein-Losing Nephropathy<\/h2>\n<p class=\"p2\"><span class=\"s2\">PLN is a disease that affects the renal glomeruli and, as a result, the kidneys\u2019 ability to properly filter proteins. Like PLE, it can be caused by inflammatory, infectious, or neoplastic disease processes. Soft-coated wheaten terriers and cocker spaniels have a genetic predisposition to PLN.<sup>3<\/sup> PLN does not require azotemia for diagnosis, and patients present with inappetence, lethargy, and, in extreme cases, edema and pleural\/peritoneal effusion.<sup>1,2<\/sup><\/span><\/p>\n<p class=\"p2\"><span class=\"s2\">Patients with PLN have <a href=\"https:\/\/todaysveterinarypractice.com\/urology-renal-medicine\/clinical-approach-to-proteinuria\/\" target=\"_blank\" rel=\"noopener\">proteinuria<\/a> (urine protein: creatine ratio &gt;<\/span><span class=\"s3\">\u2009<\/span><span class=\"s2\">1). These patients can also be hypercoagulable from loss of antithrombin III in the urine and because platelets become hyperresponsive in the face of hypoproteinemia.<sup>1-4<\/sup> Hypertension is a common effect of PLN and requires angiotensin-converting enzyme (ACE) inhibitor treatment. ACE inhibitors work by decreasing renal blood flow and blood pressure, which can pose problems during anesthesia.<sup>4,5<\/sup> Patients with PLN often need anesthesia (general and multimodal) for renal biopsy, whether via <a href=\"https:\/\/todaysveterinarypractice.com\/diagnostics\/ultrasound-guided-fine-needle-aspiration-and-core-biopsy\/\" target=\"_blank\" rel=\"noopener\">ultrasonography-guided needle-core biopsy<\/a> (Tru-Cut; Merit Medical Systems, <\/span><a href=\"http:\/\/merit.com\" target=\"_blank\" rel=\"noopener\"><span class=\"s4\">merit.com<\/span><\/a><span class=\"s2\">), abdominal laparotomy, or laparoscopy. <\/span><\/p>\n<h2 class=\"p3\">Anesthetizing Patients With Protein-Losing Enteropathy<\/h2>\n<p class=\"p2\"><span class=\"s2\">Patients with suspected PLE do not have a \u201cone size fits all\u201d disease process; therefore, the anesthetist must consider several factors in designing a customized anesthetic protocol for these patients. <\/span><\/p>\n<h3 class=\"p4\">Preanesthesia Patient Assessment<\/h3>\n<p class=\"p2\"><span class=\"s2\">First, a thorough physical examination should be performed, noting respiratory rate and effort, heart rate, body condition (e.g., edema, ascites, body condition score, muscle wasting), and body temperature (these patients can be cachectic, resulting in hypothermia). <\/span><\/p>\n<p class=\"p2\"><span class=\"s2\">Second, blood analysis\u2014including a complete blood count (CBC), serum biochemistry panel, and prothrombin time (PT)\/activated partial thromboplastin time (aPTT)\u2014should be done prior to anesthesia and evaluated by the anesthetist. Care should be taken to ensure that the CBC shows the patient to have adequate platelets. In the serum biochemistry results, it is especially important to look at the albumin levels. PT measures the extrinsic coagulation pathways, while aPTT measures the intrinsic coagulation pathways (both measure the time it takes for a fibrin clot to form when calcium and tissue activating factor are added to a whole blood sample); both should be assessed prior to any surgical incision and biopsy.<\/span><\/p>\n<p class=\"p2\"><span class=\"s2\">Third, the patient\u2019s disposition and anticipated level of pain related to the procedure to be performed should be considered when formulating an anesthetic plan. If the patient is highly stressed or agitated, it will require <\/span>a higher gas inhalant concentration or dose of anesthetic<span class=\"s2\"> medications to remain at the desired anesthetic plane (also known as the minimum alveolar concentration [MAC]), which could be detrimental to cardiac output, perfusion, and blood pressure during general anesthesia. Reducing the patient\u2019s stress\/agitation prior to induction of anesthesia helps improve patient outcomes and decreases the anesthetic doses needed. Providing preemptive analgesia also reduces MACs of gas inhalants and decreases mortality and morbidity.<sup>6<\/sup><\/span><\/p>\n<h3 class=\"p4\">Anesthetic Drug Metabolism and Choice<\/h3>\n<p class=\"p2\"><span class=\"s2\">Although research into how anesthesia causes unconsciousness continues, it is believed that plasma proteins, particularly albumin, play a role.<sup>7<\/sup> Many common anesthetic drugs\u2014such as diazepam, propofol, and gas inhalants\u2014bind to albumin, with only the unbound portion responsible for the anesthetic effect.<sup>7<\/sup> Because patients with PLE generally have dangerously low albumin and protein levels, the anesthetist must consider that these patients may not have enough albumin to bind anesthetic drugs, which can result in overdose, as well as prolonged drug metabolism and recovery.<sup>8,9<\/sup><\/span><\/p>\n<p class=\"p2\"><span class=\"s2\">The ability to reverse a medication can be lifesaving in patients that have an unexpected negative reaction to an anesthetic drug. The author generally lowers the initial anesthetic doses for patients with PLE, knowing they can be increased if needed. If the patient\u2019s disposition allows it, intravenous catheter placement without any premedication reduces the amount of long-acting or irreversible medications needed. <\/span><\/p>\n<p class=\"p5\"><b>Multimodal Anesthesia\/Analgesia<\/b><\/p>\n<p class=\"p6\"><span class=\"s2\">Multimodal anesthesia\/analgesia is very important for patients with PLE\/PLN. Multimodal anesthesia\/analgesia blocks different parts of the pain pathway, which allows the anesthetist to reduce the doses of individual pain medications used, as well as gas inhalants. Gas inhalants are the most potent vasodilators and decreasers of cardiac output compared with other anesthetic medications; therefore, decreasing the amount of gas inhalant used generally reduces the likelihood of patient hypotension under anesthesia. Decreasing the dose of each pain medication used (e.g., ketamine plus an opioid) decreases the negative effects of each drug, such as myoclonus (ketamine) and constipation and regurgitation (opioids). <\/span><\/p>\n<p class=\"p5\"><b>Sedatives<\/b><\/p>\n<p class=\"p2\"><span class=\"s2\">If sedation is needed, the author\u2019s sedative of choice is dexmedetomidine with an opioid to be given intramuscularly. Dexmedetomidine has a wide dose range, can be reversed with atipamezole, and provides additional analgesia. However, because it causes vasoconstriction and bradycardia, dexmedetomidine should only be used in patients that can tolerate such effects. It should be avoided in patients with mitral valve disease and dilated cardiomyopathy.<sup>10<\/sup><\/span><\/p>\n<p class=\"p2\"><span class=\"s2\">Acepromazine is not recommended in patients with PLE due to its inability to be reversed and the risk of vasodilation leading to hypotension under general anesthesia. Hypotension during anesthesia is a particular risk in patients with PLE because they already have low oncotic pressure from hypoalbuminemia.<sup>8,11<\/sup><\/span><\/p>\n<p class=\"p5\"><b>Opioids<\/b><\/p>\n<p class=\"p2\"><span class=\"s2\">The opioid of choice depends on the procedure. Opioids have effects on several different receptors in the dorsal horn of the spinal cord, but most used in veterinary medicine act on the \u00b5 and <\/span><span class=\"s5\">\u039a<\/span><span class=\"s2\"> receptors.<sup>12<\/sup> They may be full receptor agonists, partial receptor agonists, or mixed antagonist\u2013agonists. Each of these provides different levels of analgesia and\/or sedation, depending on the receptors they engage with.<sup>13<\/sup><\/span><\/p>\n<p class=\"p2\"><span class=\"s2\">If the patient is not undergoing surgery and is having upper\/lower endoscopy, the author generally chooses butorphanol. Butorphanol is a partial \u00b5 antagonist and <\/span><span class=\"s5\">\u039a<\/span><span class=\"s2\"> agonist, meaning that it provides mild analgesia and good sedation.<sup>13<\/sup> It is relatively short acting (1 to 2 h) and is reversible with naloxone. On the other hand, the author avoids buprenorphine prior to anesthetic events. Buprenorphine is a partial \u00b5 agonist that provides mild sedation and moderate analgesia. It has a high affinity for the \u00b5 receptors, and reversal can be near impossible.<sup>14<\/sup><\/span><\/p>\n<p class=\"p2\"><span class=\"s2\">If the patient is undergoing laparotomy for intestinal biopsy, then a full \u00b5 opioid is indicated. Full \u00b5 opioids are superior analgesics and should be administered prior to the start of a noxious stimulus. Hydromorphone, morphine, methadone, fentanyl, and remifentanil can be safely administered to patients with suspected PLE. Hydromorphone and morphine cause vomiting after administration; therefore, the author recommends antiemetics be given prior to their administration. Methadone provides less sedation than hydromorphone, but it has multimodal effects\u2014it antagonizes <i>N<\/i>-methyl-D-aspartate (NMDA) receptors as well as opioid receptors\u2014making it a superior analgesic.<sup>15<\/sup> Fentanyl is short acting and needs to be given as an intravenous bolus followed by a constant-rate infusion (CRI), which makes it titratable. <\/span><\/p>\n<p class=\"p5\"><b>Induction Agents<\/b><\/p>\n<p class=\"p2\"><span class=\"s2\">For induction, the author generally chooses a benzodiazepine (e.g., midazolam, diazepam) with propofol. Diazepam requires protein binding for metabolism<sup>7<\/sup>; therefore, the author prefers midazolam as a coinduction agent. Midazolam potentiates the activity of <\/span><span class=\"s5\">\u03b3<\/span><span class=\"s2\">-aminobutyric acid (GABA) receptors; it produces muscle relaxation with minimal cardiovascular side effects and is short acting.<\/span><\/p>\n<p class=\"p2\"><span class=\"s2\">Propofol is a sedative-hypnotic agent with rapid induction and recovery times that depresses the inhibitory neurotransmitter GABA; it causes myocardial depression and decreased contractility with transient hypotension and apnea. However, these effects are dose dependent. Using a benzodiazepine in conjunction with propofol reduces the amount of propofol needed, resulting in fewer undesirable side effects of propofol.<sup>16<\/sup><\/span><\/p>\n<p class=\"p2\"><span class=\"s2\">Alfaxalone is also another option for induction. Alfaxalone is a neurosteroid that is a GABA agonist. It potentiates central nervous relaxation, resulting in minimal cardiopulmonary depression, muscle relaxation, rapid induction and recovery, and extrahepatic metabolism. If alfaxalone is given too fast intravenously, it can cause vasodilation and apnea; titrating it slowly is key to prevent these effects.<sup>17<\/sup> Recovery can also be rough with tremors and noise\/light sensitivity when alfaxalone is used, but when it is added with benzodiazepines and opioids, the tremors can be reduced. <\/span><\/p>\n<p class=\"p2\"><span class=\"s2\">Ketamine is not contraindicated in patients with PLE and is another good option for induction or analgesia due to its ability to provide analgesia when given at lower rates and as a CRI. Ketamine is a dissociative anesthetic that increases sympathetic tone, thus increasing heart rate, cardiac output, and blood pressure. Ketamine\u2019s analgesic effects come from its antagonistic effects on NMDA receptors, which are responsible for wind-up that contributes to neuropathic and chronic pain. <\/span><\/p>\n<p class=\"p5\"><b>Analgesic Drugs<\/b><\/p>\n<p class=\"p2\"><span class=\"s2\">For perioperative analgesia, it is recommended to add an opioid, ketamine, or lidocaine CRI. If the patient is undergoing upper\/lower GI endoscopy, a CRI is generally not necessary other than to reduce gas inhalant requirements, especially if the patient is experiencing hypotension, tachycardia, bradycardia, or hypoventilation. <\/span><\/p>\n<h3 class=\"p4\">Fluid Therapy<\/h3>\n<p class=\"p2\"><span class=\"s2\"><a href=\"https:\/\/todaysveterinarynurse.com\/internal-medicine\/the-basics-of-fluid-therapy-for-small-animal-veterinary-technicians\/\" target=\"_blank\" rel=\"noopener\">Fluid therapy<\/a> is an important consideration for patients with PLE because they can be dehydrated. IV fluids (typically crystalloids) are administered during anesthesia to help with perfusion and provide blood pressure support when the body is faced with vasodilation from gas inhalants and anesthesia medications.<sup>18<\/sup> However, without albumin to provide oncotic pressure, crystalloids can cause further edema, including pulmonary edema and pleural effusion. A patient with PLE can easily become fluid overloaded with crystalloids. If serum albumin is less than 2\u00a0g\/dL, the author considers colloid therapy.<sup>1,2<\/sup> Three colloid options exist in veterinary medicine: fresh frozen plasma\/frozen plasma, hetastarch, and albumin. The choice of colloid depends on the patient.<sup>19<\/sup><\/span><\/p>\n<p class=\"p2\"><span class=\"s2\">Fresh frozen plasma is a natural colloid that has certain clotting factors and can help replenish what the patient has lost through the GI tract. Frozen plasma is a natural colloid that has minimal clotting factors but still contains albumin and antithrombin. Fresh frozen plasma is generally chosen if the patient has coagulopathies due to PLE (e.g., increased clotting times, increased buccal mucosal bleeding time), whereas frozen plasma can be used in the face of albumin support. It takes a large amount of fresh frozen plasma\/frozen plasma to replenish albumin (about 22\u00a0mL\/kg to raise the albumin 0.5 g\/dL).<sup>20<\/sup><\/span><\/p>\n<p class=\"p2\"><span class=\"s2\">Hetastarch (VetStarch; Zoetis, <\/span><a href=\"http:\/\/zoetisus.com\" target=\"_blank\" rel=\"noopener\"><span class=\"s4\">zoetisus.com<\/span><\/a><span class=\"s2\">) is a synthetic colloid that mimics albumin and stays within the vasculature for 24\u00a0hours. It can be used to help provide oncotic pressure support for patients with PLE undergoing anesthesia.<sup>11<\/sup> Hetastarch has had some controversy with regard to causing coagulopathies and acute kidney injury. Giving less than 20 mL\/kg\/day and using the lowest amount possible seems to be the safest way to avoid those issues.<sup>21<\/sup><\/span><\/p>\n<p class=\"p2\"><span class=\"s2\">Lyophilized canine-specific albumin has been developed for use in dogs and can be safely administered with minimal side effects to patients with hypoalbuminemia. It can be reconstituted to the desired concentration based on patient needs. <\/span><\/p>\n<h3 class=\"p4\">Blood Pressure Support<\/h3>\n<p class=\"p2\"><span class=\"s2\">Because patients with PLE lack plasma proteins to help with oncotic pressure and generally have decreased perfusion because of edema, hypotension can be a concern. Besides providing a colloid for fluid therapy during anesthesia, the anesthetist should have a backup plan should the patient be persistently hypotensive and not responsive to colloid therapy. <\/span><\/p>\n<p class=\"p2\"><span class=\"s2\">Vasopressors and positive inotropes are the 2 options available in veterinary medicine for blood pressure support. The 2 most common vasopressors are norepinephrine and phenylephrine. Norepinephrine is an <\/span><span class=\"s5\">\u03b1<\/span><span class=\"s2\"><sub>1<\/sub> agonist with moderate <\/span><span class=\"s5\">\u03b2<\/span><span class=\"s2\"><sub>1<\/sub> effects that increases blood pressure via vasoconstriction and increased cardiac contractility. Phenylephrine is a true <\/span><span class=\"s5\">\u03b1<\/span><span class=\"s2\"> agonist and causes vasoconstriction, thus increasing blood pressure; however, it decreases heart rate and cardiac output.<sup>22<\/sup><\/span><\/p>\n<p class=\"p2\"><span class=\"s2\">The 2 positive inotropes available in veterinary medicine are dopamine and dobutamine. Dopamine is an <\/span><span class=\"s5\">\u03b1<\/span><span class=\"s2\"><sub>1<\/sub>, <\/span><span class=\"s5\">\u03b2<\/span><span class=\"s2\"><sub>1<\/sub>, and <\/span><span class=\"s5\">\u03b2<\/span><span class=\"s2\"><sub>2<\/sub> agonist that increases cardiac output by increasing contractility and heart rate and can cause vasoconstriction at higher doses. Dobutamine works only on <\/span><span class=\"s5\">\u03b2<\/span><span class=\"s2\"> receptors, increasing cardiac contractility and heart rate while causing vasodilation. The patient\u2019s comorbidities determine which agent should be chosen. <\/span><\/p>\n<h3 class=\"p4\">Temperature Support<\/h3>\n<p class=\"p2\"><span class=\"s2\">Hypothermia is a particular concern for patients with PLE. Because they are often cachectic and have low body condition scores, they quickly become hypothermic under anesthesia due to lack of insulation, as well as from heat loss through convection (open body cavities), radiation (vasodilation), conduction (lying on a cold table), and evaporation (dry air). Patients that experience hypothermia under anesthesia are at risk for decreased cardiac output, decreased drug metabolism, longer recovery times, and delayed wound healing.<sup>23<\/sup> <\/span><\/p>\n<p class=\"p2\"><span class=\"s2\">Procedural tables and gurneys should be properly padded and active warming measures taken during anesthesia. After the patient has received its physical examination and its temperature has been measured, it should be placed on a warm water blanket or a warm air circulating device on a low\/medium setting during the premedication phase and through induction and preoperative preparation. To avoid anesthesia-induced hypothermia caused by inhalation of cold, dry anesthetic gases, a low-flow oxygen rate (6 to 10 mL\/kg\/min) can be used to replace only the oxygen required by the patient (i.e., no excess oxygen consumption) and warm water bags placed around the breathing circuit to warm the air the patient is breathing. Placing blankets and padding between patients and the operating table is essential.<sup>24<\/sup> <\/span><\/p>\n<h3 class=\"p4\">Ventilation<\/h3>\n<p class=\"p2\"><span class=\"s2\">Patients with PLE may not need ventilation if there is no pleural effusion. All patients should be preoxygenated prior to induction, and if pleural effusion is present, a thoracocentesis should be performed prior to anesthesia. Ventilation will be required if the patient is undergoing a laparoscopic GI biopsy as the abdomen will be filled with carbon dioxide, which decreases the functional residual capacity of the lungs and increases pressure on the diaphragm. Carbon dioxide will also diffuse from the abdomen into the bloodstream and out of the body via the lungs. Ventilating during laparoscopic procedures is imperative to help the patient breathe off the excess carbon dioxide and to prevent respiratory acidosis. <\/span><\/p>\n<h2 class=\"p3\">Anesthetizing Patients With Protein-Losing Nephropathy<\/h2>\n<p class=\"p2\"><span class=\"s2\">Patients with PLN presenting for an anesthetic event generally have the same anesthetic considerations as patients with PLE, such as the need for a thorough physical examination, blood analysis, and assessment of patient disposition. For patients with PLN, it is important to include blood pressure as part of the physical examination as these patients are often hypertensive. Knowing what is \u201cnormal\u201d for these patients is vital, as their body cannot adjust to a lower heart rate, blood pressure, or respiratory rate. <\/span><\/p>\n<p class=\"p2\"><span class=\"s2\">As for patients with PLE, blood analysis for patients with PLN should include a complete blood count, serum biochemistry panel, and clotting times. Albumin and protein levels are especially important, as are liver\/kidney function measures. Urinalysis and abdominal ultrasonography should also be performed in these patients to assess kidney function. Using large volumes of fluids during an anesthetic event can be detrimental in these patients; therefore, lower isotonic fluid resuscitation rates or a plasma or hydroxyethyl starch CRI should be used instead of regular IV fluid therapy (e.g., lactated Ringer\u2019s, Normasol-R, Plasma-Lyte).<sup>4,11,25<\/sup><\/span><\/p>\n<h3 class=\"p4\">Preanesthesia Patient Assessment<\/h3>\n<p class=\"p2\"><span class=\"s2\">Patients with PLN generally have systemic hypertension. Although the reason is unknown, kidney disease may play a role, as kidney disease causes hypertension through sodium retention, activation of the renin-angiotensin system, and sympathetic nervous system stimulation. Patients with PLN are often prescribed ACE inhibitors for hypertension. The ACE inhibitor of choice is generally enalapril because it not only decreases proteinuria but also delays the onset of kidney failure. <\/span><\/p>\n<p class=\"p2\"><span class=\"s2\">When preparing for a patient with PLN to be anesthetized, the anesthetist should obtain a blood pressure measurement prior to any anesthetic medications being administered to the patient. These animals are used to perfusing vital organs at higher blood pressures; therefore, during an anesthetic event, in which hypotension is common, all measures should be taken to keep the patient\u2019s blood pressure as close to their norm as possible. The anesthetist should also ensure that the patient does not receive its ACE inhibitor the morning of the anesthetic event. If the patient is anesthetized while an ACE inhibitor is active, it can experience hypotension that is hard to correct. The author often postpones an anesthetic event if the patient has received an ACE inhibitor that day.<sup>5<\/sup><\/span><\/p>\n<h3 class=\"p4\">Anesthetic Drug Metabolism and Choice<\/h3>\n<p class=\"p2\"><span class=\"s2\">Patients with PLN usually have some form of kidney damage unless PLN is caught very early. As the kidneys are mainly responsible for filtering drugs\u2014including anesthetic drugs\u2014out of the body, decreased kidney function from any cause (e.g., age, glomeruli damage, sepsis) can decrease drug filtration. <\/span><\/p>\n<p class=\"p2\"><span class=\"s2\">If PLN is caught early, then the likelihood of kidney disease is low. However, PLN is usually not diagnosed until signs of kidney disease are present. If kidney disease is present, drug filtration will be decreased, which can increase recovery times and negative drug effects. For patients with PLN, the author likes to use lower drug doses and short-acting, reversible anesthetic drugs. This allows for more control of the anesthetic drugs in case of any detrimental effects due to the patient\u2019s inability to properly excrete the drugs. <\/span><\/p>\n<h2 class=\"p3\">Summary<\/h2>\n<p class=\"p2\"><span class=\"s2\">Patients with PLE and PLN can be challenging for the veterinary anesthesia team. However, with preparation and as much diagnostic information as possible, these patients can be safely anesthetized. <\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>This article describes how protein-losing diseases affect the patient, common comorbidities and how to address them, and how to prepare and create an anesthetic plan for these patients.<\/p>\n","protected":false},"author":236,"featured_media":30276,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"iawp_total_views":0,"footnotes":""},"categories":[353],"tags":[192,145],"class_list":["post-30274","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-spring-2024","tag-continuing-education","tag-peer-reviewed","column-continuing-education","clinical_topics-anesthesiology"],"acf":{"hide_sidebar":false,"hide_sidebar_ad":false,"hide_all_ads":false},"yoast_head":"<!-- This site is optimized with the Yoast 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