Arterial hypertension / Systemic hypertension

Arterial hypertension, also known as systemic hypertension or high blood pressure, is a common and potentially serious condition in cats characterized by persistently elevated pressure within the systemic arterial blood vessels. This increased pressure places strain on the heart, blood vessels, and various target organs throughout the body, potentially leading to significant organ damage if left untreated. Feline hypertension is recognized as one of the most important cardiovascular conditions in older cats, with prevalence increasing significantly with age and in association with other common feline diseases. Unlike in humans where primary hypertension is common, cats typically develop hypertension secondary to other underlying conditions, making identification and treatment of the primary disease an essential component of management.

The causes of feline hypertension are most commonly related to other systemic diseases that affect blood pressure regulation. Chronic kidney disease represents the most common cause of hypertension in cats, with elevated blood pressure occurring in a substantial percentage of cats with renal dysfunction. Hyperthyroidism, another common condition in older cats, frequently leads to hypertension through the cardiovascular effects of excess thyroid hormone. Other less common causes include diabetes mellitus, hyperaldosteronism, pheochromocytoma, and certain cardiac conditions. In some cats, no underlying cause can be identified, a condition termed idiopathic or primary hypertension. Understanding the relationship between hypertension and these primary diseases is crucial for effective long-term management.

The impact of hypertension on affected cats can be devastating, particularly when the condition goes undiagnosed and untreated. Target organ damage affects multiple body systems, with the eyes, kidneys, heart, and brain being most vulnerable. Hypertensive retinopathy can cause sudden blindness through retinal detachment or hemorrhage, often serving as the presenting sign that prompts diagnosis. Cardiac effects include left ventricular hypertrophy and potential heart failure. Renal damage from hypertension can accelerate existing kidney disease progression. Neurological effects may include stroke-like episodes, disorientation, and seizures. The insidious nature of hypertension means significant damage may occur before obvious clinical signs develop.

Feline hypertension is a treatable condition, and with appropriate therapy, target organ damage can often be prevented or stabilized. Antihypertensive medications effectively lower blood pressure in most cats when administered consistently. Identifying and treating underlying diseases addresses the root cause of secondary hypertension. Regular blood pressure monitoring allows for dose adjustments to achieve optimal control. While some target organ damage, particularly ocular changes, may be irreversible if present at diagnosis, prompt treatment can prevent further deterioration. Early detection through routine blood pressure screening in at-risk cats provides the best opportunity to prevent the serious consequences of uncontrolled hypertension.

The primary causes of feline hypertension are most commonly other systemic diseases that disrupt normal blood pressure regulation mechanisms. Chronic kidney disease represents the leading cause of secondary hypertension in cats, with studies suggesting that twenty to sixty percent of cats with kidney disease develop elevated blood pressure. The relationship between kidney disease and hypertension is bidirectional, as hypertension can both result from and contribute to renal dysfunction. Mechanisms linking kidney disease to hypertension include sodium and water retention, activation of the renin-angiotensin-aldosterone system, and reduced production of vasodilatory substances by damaged kidneys. The severity of kidney disease does not always correlate with hypertension risk, making blood pressure monitoring essential in all cats with renal compromise.

Hyperthyroidism is another major cause of hypertension in cats, though the relationship is complex. Excess thyroid hormone increases cardiac output, heart rate, and can affect peripheral vascular resistance. However, hyperthyroidism can also mask underlying kidney disease that becomes apparent only after thyroid levels are normalized with treatment. Some hyperthyroid cats may develop or worsen hypertension after treatment as kidney function declines. This interaction between thyroid disease, kidney function, and blood pressure highlights the importance of comprehensive evaluation and monitoring in affected cats. Other endocrine conditions including hyperaldosteronism, pheochromocytoma, and diabetes mellitus can also cause secondary hypertension through various hormonal mechanisms.

Idiopathic or primary hypertension occurs when elevated blood pressure develops without an identifiable underlying cause. While less common than secondary hypertension in cats, primary hypertension does occur and may have genetic components not yet fully characterized. The distinction between primary and secondary hypertension can be challenging, as occult disease may be present but undetected at the time of diagnosis. Some cats initially classified as having primary hypertension may later be diagnosed with underlying conditions as disease progresses. Obesity, stress, and dietary factors may contribute to blood pressure elevation in some cats, though their role in feline hypertension is less clearly defined than in human medicine.

Risk factors for developing hypertension in cats include advanced age, with prevalence increasing significantly in cats over ten years old. Breeds predisposed to conditions associated with hypertension, such as those prone to kidney disease, may face elevated risk. Male cats may be slightly more commonly affected in some studies, though sex predilection is not consistently documented. Pre-existing kidney disease, hyperthyroidism, or other metabolic conditions substantially increase hypertension risk. Cats on certain medications, including some corticosteroids, may experience blood pressure elevation. Regular monitoring of at-risk cats enables early detection before target organ damage occurs.

The mechanism by which hypertension develops involves complex interactions between cardiac output, blood volume, and vascular resistance. Normal blood pressure is maintained through multiple regulatory systems including the kidneys, nervous system, and endocrine glands. When these systems are disrupted by disease, blood pressure can rise to pathological levels. In kidney disease, impaired sodium excretion leads to volume expansion while hormonal changes increase vascular resistance. In hyperthyroidism, increased cardiac output initially raises blood pressure, while peripheral effects are more variable. The sustained elevation of pressure damages blood vessel walls, impairs autoregulation in sensitive organs, and creates a cascade of injury that perpetuates hypertension and organ damage.

Early warning signs of feline hypertension are often subtle or entirely absent, earning the condition its reputation as a silent killer. Cats are masters at masking illness, and the gradual development of elevated blood pressure may produce no obvious symptoms until significant organ damage has occurred. Some owners may notice subtle behavioral changes such as increased vocalization, particularly at night, or mild disorientation. Increased thirst and urination may be present but are often attributed to underlying kidney disease rather than hypertension itself. Slight changes in activity level or appetite may go unnoticed or be dismissed as normal aging. This lack of early warning signs underscores the importance of routine blood pressure screening in at-risk cats.

The most dramatic symptoms of feline hypertension often relate to ocular damage and can appear suddenly without warning. Hypertensive retinopathy causes vision impairment that may range from subtle visual deficits to complete blindness. Owners may notice their cat bumping into objects, hesitating at stairs, or showing reluctance to jump. Pupils may become dilated and unresponsive to light. Examination may reveal blood in the anterior chamber of the eye, retinal hemorrhages, or retinal detachment. Sudden blindness is frequently the presenting complaint that leads to hypertension diagnosis, though by this stage, significant and often irreversible ocular damage has occurred. Both eyes are typically affected, though severity may differ between them.

Behavioral changes associated with hypertension reflect effects on multiple organ systems. Neurological symptoms can include disorientation, circling, head pressing, or seizures when blood pressure reaches dangerously high levels or when cerebrovascular events occur. Changes in personality or mentation may be subtle, with cats seeming confused or anxious. Increased irritability or hiding behavior may develop. Changes in sleep patterns, with increased restlessness or nighttime vocalization, are commonly reported. Some cats show reduced grooming or decreased interest in interaction with family members. These changes often develop gradually and may be incorrectly attributed to aging.

Physical signs of hypertension include those related to target organ damage and underlying disease. Ocular examination may reveal dilated pupils, hemorrhages visible in the eye, or detached retinas. Cardiac auscultation may detect a gallop rhythm or murmur related to left ventricular hypertrophy. Signs of underlying kidney disease include weight loss, poor coat condition, and dehydration. Hyperthyroid cats often display weight loss despite increased appetite, along with hyperactivity and sometimes palpable thyroid nodules. In severe cases, neurological abnormalities including ataxia, nystagmus, or altered consciousness may be present.

Symptom progression in untreated hypertension typically involves worsening target organ damage over time. Initial subclinical damage to the eyes, heart, and kidneys progresses to clinically apparent dysfunction. Vision loss that begins as subtle deficits may progress to complete blindness. Cardiac changes advance from mild hypertrophy to overt heart failure in some cats. Kidney function may decline more rapidly in hypertensive cats compared to those with controlled blood pressure. Neurological events may become more frequent or severe. The rate of progression varies between individuals and depends partly on blood pressure magnitude and consistency of elevation.

Emergency symptoms requiring immediate veterinary attention include sudden complete blindness, severe disorientation or collapse, seizures, acute onset of neurological deficits such as head tilt or inability to walk, and severe respiratory distress that may indicate heart failure. These presentations constitute hypertensive emergencies or urgencies requiring immediate blood pressure reduction to prevent further organ damage. Sudden vision loss, while devastating, represents an opportunity for intervention, as prompt blood pressure control may allow partial vision recovery in some cases if retinal detachment is recent. Any acute neurological event in an older cat should prompt consideration of hypertension as a potential cause.

The diagnostic process for feline hypertension centers on accurate blood pressure measurement using appropriate equipment and technique. Blood pressure in cats is most commonly measured using oscillometric or Doppler methods, with Doppler sphygmomanometry considered the gold standard by many practitioners. The procedure requires a calm, minimally restrained cat in a quiet environment, as stress significantly affects readings. Multiple measurements are taken, typically five to seven, with the initial reading often discarded to account for the white coat effect. Consistent technique including proper cuff size selection and placement is essential for accurate results. The diagnosis of hypertension requires confirmation of persistently elevated readings, as single measurements may be falsely elevated due to stress.

Current guidelines define feline hypertension based on systolic blood pressure measurements and associated risk of target organ damage. Systolic blood pressure below 140 mmHg is considered normal with minimal risk. Pressures between 140 and 159 mmHg indicate mild hypertension with low risk. Moderate hypertension is defined as pressures between 160 and 179 mmHg with moderate risk of organ damage. Severe hypertension exists when pressures exceed 180 mmHg, carrying high risk of serious target organ damage. Clinical decisions consider both the blood pressure level and evidence of existing target organ damage. Treatment thresholds may be adjusted based on individual patient factors and the presence of underlying disease.

Comprehensive evaluation of hypertensive cats includes assessment for underlying causes and target organ damage. Thorough physical examination pays particular attention to cardiac auscultation, retinal examination, and thyroid palpation. Ophthalmic examination, ideally performed by a veterinary ophthalmologist, evaluates for hypertensive retinopathy including retinal hemorrhages, edema, detachment, and vascular changes. Blood tests include complete blood count, comprehensive metabolic panel with kidney function assessment, thyroid hormone levels, and urinalysis. Additional testing such as urine protein quantification and aldosterone measurement may be indicated based on initial findings. Cardiac evaluation with echocardiography assesses for left ventricular hypertrophy and overall cardiac function.

Differential diagnosis considers other causes of the presenting symptoms, particularly when hypertension presents with ocular or neurological signs. Other causes of sudden blindness include primary retinal diseases, optic neuritis, and central nervous system lesions. Neurological symptoms may result from primary brain disease, metabolic disturbances, or toxicities. The combination of findings guides differential prioritization, with blood pressure measurement providing a straightforward method to confirm or exclude hypertension as the underlying cause. Identification of underlying diseases causing secondary hypertension is essential for comprehensive management. The diagnostic workup simultaneously investigates hypertension and its potential causes, enabling development of a complete treatment plan addressing all identified conditions.

Emergency treatment for hypertensive crisis focuses on controlled blood pressure reduction to prevent ongoing organ damage while avoiding complications from too-rapid normalization. Cats presenting with acute severe hypertension, particularly those with neurological symptoms or acute vision loss, require prompt intervention. Amlodipine, the first-line antihypertensive medication for cats, can be administered for immediate effect. In some cases, sedation with acepromazine may help lower blood pressure through its vasodilatory effects while reducing patient stress. Monitoring during acute treatment tracks blood pressure response and neurological status. The goal is gradual pressure reduction rather than immediate normalization, as dramatic drops can compromise organ perfusion. Hospitalization allows close monitoring during the initial stabilization period.

Medical management of feline hypertension primarily relies on amlodipine, a calcium channel blocker with excellent efficacy and safety in cats. Amlodipine works by relaxing vascular smooth muscle, reducing peripheral resistance, and thereby lowering blood pressure. Initial dosing is typically once daily, with dose adjustments based on blood pressure response at follow-up evaluations. Most cats achieve adequate blood pressure control with amlodipine alone, though some may require additional agents. Telmisartan, an angiotensin receptor blocker, may be added for cats not adequately controlled with amlodipine alone or when renoprotective effects are desired. Other antihypertensives including beta-blockers and ACE inhibitors have roles in specific situations. Medication must be continued long-term, as hypertension returns when treatment is discontinued.

Treatment of underlying diseases is essential for comprehensive hypertension management. Cats with hyperthyroidism should receive appropriate thyroid treatment, whether medical, surgical, or radioiodine therapy, with understanding that blood pressure and kidney function require monitoring during and after treatment. Chronic kidney disease management includes dietary modification, phosphorus control, hydration support, and other measures to slow progression and maintain quality of life. Hyperaldosteronism requires specific treatment addressing the underlying adrenal pathology. Addressing these primary conditions may reduce or eliminate the need for antihypertensive medication in some cases, while in others, hypertension persists and requires ongoing treatment regardless of primary disease control.

Supportive care complements antihypertensive therapy and addresses target organ damage. Cats with vision loss benefit from environmental modifications that minimize hazards and support adaptation to blindness. Maintaining consistent furniture placement, providing easily accessible resources, and using verbal cues help blind cats navigate their environment. Cats with cardiac changes may require specific cardiac medications if heart failure develops. Nutritional support maintains body condition and provides appropriate dietary therapy for underlying conditions. Stress reduction through environmental management and gentle handling supports overall wellbeing. Regular monitoring of both blood pressure and organ function guides ongoing treatment adjustments.

Monitoring blood pressure response to treatment is essential for optimizing outcomes. Initial follow-up is typically scheduled within one to two weeks after starting or adjusting therapy, with blood pressure measurement to assess response. Dosage is titrated to achieve target pressure, generally below 140 to 150 mmHg systolic. Once stable, monitoring frequency may decrease to every three to six months in well-controlled patients. Regular reassessment of underlying disease status, target organ function, and medication tolerance ensures comprehensive management. Blood pressure logs tracking home measurements, when feasible, or consistent in-clinic technique provide trending information to guide treatment decisions.

Owner education supports successful long-term management of feline hypertension. Understanding the chronic nature of the condition and the importance of consistent medication administration improves compliance. Learning to recognize signs that might indicate blood pressure changes or treatment complications enables appropriate response. Awareness of the relationship between hypertension and underlying diseases helps owners understand the comprehensive management approach. Discussion of prognosis, which depends largely on underlying disease control and prevention of further organ damage, helps set appropriate expectations. Regular veterinary communication keeps owners engaged in their cat's care and enables timely adjustments when needed.

Recovery from acute hypertensive emergency depends on the severity of presentation and the extent of organ damage at the time of intervention. Cats presenting with acute severe hypertension that is promptly treated often show improvement within hours to days as blood pressure normalizes. Neurological symptoms may resolve as cerebral perfusion stabilizes, though some deficits may persist depending on whether structural brain damage occurred. Vision recovery is more variable, with outcomes depending on the nature and duration of retinal injury. Retinal edema may resolve with blood pressure control, potentially restoring some vision, while retinal detachment has a more guarded prognosis for recovery. Cardiac changes may improve or stabilize with sustained blood pressure control.

Post-treatment care for cats with hypertension involves lifelong medication administration and monitoring. Owners must commit to consistent daily medication, which most commonly involves once-daily amlodipine administration. Initial follow-up appointments occur frequently to optimize blood pressure control, with visits becoming less frequent once the cat is stable. Monitoring for side effects of medication, though uncommon with amlodipine, includes watching for signs of hypotension such as weakness or lethargy. Ongoing management of underlying diseases requires additional medications and monitoring. Home observation for any changes in vision, behavior, or overall condition provides valuable information between veterinary visits.

Prognosis for cats with hypertension depends primarily on the nature and severity of underlying disease and the degree of target organ damage at diagnosis. Cats diagnosed before significant target organ damage has occurred have the best prognosis with appropriate treatment. Those with well-controlled underlying diseases such as hyperthyroidism treated with radioiodine may achieve excellent long-term outcomes. Cats with progressive chronic kidney disease face a more guarded prognosis overall, though blood pressure control can slow disease progression and maintain quality of life. Cats that have experienced severe ocular damage typically retain impaired vision despite treatment, though they can adapt well to blindness with appropriate environmental support.

Long-term outlook for cats with hypertension managed appropriately can be favorable. Many cats live for years following diagnosis with good quality of life when blood pressure is controlled and underlying diseases are managed. The key to positive outcomes is consistent monitoring and treatment adjustment as needed. Regular veterinary visits with blood pressure measurement, assessment of underlying disease status, and target organ evaluation enable proactive management. Understanding that hypertension is a chronic condition requiring lifelong attention helps owners maintain the commitment needed for successful management. With appropriate care, many hypertensive cats can enjoy comfortable, happy lives for extended periods.

Primary prevention of feline hypertension focuses on managing conditions that cause secondary blood pressure elevation and detecting hypertension early before organ damage occurs. Regular veterinary care with monitoring for diseases associated with hypertension, particularly in older cats, enables early detection and treatment. Blood pressure screening should be part of routine wellness examinations for cats over seven to ten years of age and for any cat diagnosed with kidney disease, hyperthyroidism, or other conditions linked to hypertension. Early treatment of underlying diseases may prevent or delay hypertension development. Maintaining ideal body weight through appropriate nutrition and activity reduces general cardiovascular risk.

Environmental prevention involves minimizing factors that might contribute to blood pressure elevation. Reducing chronic stress through stable home environments, appropriate resources, and attention to feline behavioral needs supports overall health. Providing appropriate mental and physical stimulation maintains wellbeing. Avoiding excessive dietary sodium may have theoretical benefits, though the role of sodium intake in feline hypertension is less clearly defined than in humans. Ensuring adequate hydration supports kidney function. Creating calm environments for veterinary visits reduces white coat effects that can complicate blood pressure assessment.

Dietary considerations for hypertension prevention and management include appropriate nutrition for overall health and specific dietary therapy for underlying conditions. Cats with kidney disease benefit from diets formulated for renal support, which are often moderately reduced in sodium and phosphorus. Hyperthyroid cats may require dietary management as part of their treatment regimen. Maintaining lean body condition through appropriate caloric intake reduces cardiovascular strain. Adequate protein intake supports muscle mass while managing any specific dietary restrictions required by underlying diseases. Consultation with a veterinary nutritionist may benefit cats with complex medical conditions.

Health maintenance practices supporting hypertension prevention include regular veterinary examinations with comprehensive physical assessment. Annual or semi-annual wellness visits for adult cats and more frequent visits for seniors provide opportunities for blood pressure screening. Early detection and treatment of kidney disease, hyperthyroidism, and other conditions reduces hypertension risk and impact. Maintaining current vaccinations and parasite prevention supports overall health. Documentation of baseline blood pressure values when cats are healthy provides reference points for future comparison. Owner education about the signs of hypertension and its associated conditions promotes awareness.

Early intervention strategies focus on detecting hypertension before target organ damage occurs. Routine blood pressure screening in at-risk cats identifies elevated pressures while still subclinical. Prompt treatment when hypertension is detected prevents organ damage from developing. Regular monitoring of cats with conditions associated with hypertension catches blood pressure elevation as it develops. Owner recognition of subtle changes that might indicate hypertension or its complications enables timely veterinary consultation. A proactive approach to screening and treatment represents the most effective strategy for preventing the serious consequences of uncontrolled feline hypertension.

Daily management of a cat with hypertension requires consistent attention to medication administration and monitoring for changes in condition. Antihypertensive medication, most commonly amlodipine, must be given at the same time each day to maintain stable blood pressure control. Missing doses can result in blood pressure spikes that may cause additional organ damage. Owners should establish a routine that integrates medication administration with daily activities to minimize missed doses. Observation of appetite, activity level, and behavior provides information about overall condition. For cats with vision impairment, consistency in the home environment supports their ability to navigate safely.

Home environment modifications particularly benefit cats that have experienced vision loss from hypertensive retinopathy. Maintaining consistent furniture placement allows blind cats to develop mental maps of their environment. Removing hazards such as sharp corners at eye level and securing loose items reduces injury risk. Providing easily accessible food, water, and litter boxes on a single level eliminates the need to navigate stairs. Using textured rugs or mats to indicate important locations helps cats orient themselves. Speaking to blind cats before approaching or touching them prevents startle reactions. Many cats adapt remarkably well to vision loss with appropriate environmental support.

Maintaining quality of life for hypertensive cats involves managing both the blood pressure condition and any underlying diseases. Cats with well-controlled hypertension can enjoy normal activities and comfortable lives. For those managing concurrent conditions such as kidney disease or hyperthyroidism, attention to the requirements of each condition ensures comprehensive care. Mental stimulation appropriate to the cat's abilities, comfortable resting areas, and positive social interaction support psychological wellbeing. Maintaining grooming if the cat has reduced self-care abilities keeps them comfortable. Regular assessment of quality of life helps ensure that medical management is achieving meaningful benefits.

Ongoing monitoring and veterinary care form essential components of long-term hypertension management. Blood pressure should be measured at regular intervals, typically every three to six months in stable patients, with more frequent assessment during initial treatment or when adjustments are made. Comprehensive examinations assess for progression of target organ damage and monitor underlying disease status. Blood and urine tests track kidney function and other parameters affected by hypertension and its causes. Retinal examinations monitor for new or progressive ocular changes. Medication adjustments based on monitoring results optimize blood pressure control over time.

Caregiver support helps owners manage the ongoing responsibilities of caring for a cat with a chronic condition. Understanding the nature of hypertension and its management reduces anxiety about the condition. Learning to recognize signs that might indicate problems such as blood pressure changes or medication side effects enables appropriate response. Financial planning for ongoing medication and monitoring costs helps manage the economic aspects of chronic disease care. Connecting with other pet owners managing similar conditions provides emotional support and practical advice. Veterinary teams provide guidance and support throughout the management journey, helping owners navigate decisions and adjust to changes in their cat's condition.

Feline hypertension can affect cats of any breed, with risk primarily determined by age and presence of underlying diseases rather than breed-specific factors. The condition becomes increasingly common with advancing age, with cats over ten years showing substantially higher prevalence than younger individuals. Breeds predisposed to conditions associated with hypertension may face elevated indirect risk. For example, breeds with higher rates of polycystic kidney disease, which can lead to chronic kidney disease and secondary hypertension, might have increased prevalence. Breeds prone to hyperthyroidism, though breed associations with this condition are not strongly established, would similarly face increased hypertension risk through that pathway.

Mixed breed cats and domestic shorthairs develop hypertension with frequency similar to or greater than purebred cats, reflecting the age-related and disease-associated nature of the condition rather than inherited breed-specific risk. The widespread nature of kidney disease and hyperthyroidism across cat populations means that hypertension affects cats regardless of pedigree status. Male cats may be slightly more commonly affected in some studies, though sex predilection is not consistently documented. Older cats of any breed or mix should be considered candidates for blood pressure screening as part of routine health care.

Screening recommendations focus on age and health status rather than breed. All cats over seven years of age should have blood pressure measured as part of routine wellness care, with annual or more frequent screening as they age. Cats diagnosed with chronic kidney disease, hyperthyroidism, diabetes mellitus, or other conditions associated with hypertension should have blood pressure monitored regardless of age. Cats presenting with signs of potential target organ damage such as vision changes, heart murmurs, or neurological symptoms should have blood pressure assessed promptly. This universal screening approach based on risk factors rather than breed ensures that at-risk cats are identified and treated before significant organ damage occurs.

Several conditions commonly occur alongside or cause feline hypertension. Chronic kidney disease is the most frequent comorbidity, present in a substantial proportion of hypertensive cats and likely causative in many cases. The relationship is bidirectional, with hypertension both resulting from and accelerating kidney damage. Hyperthyroidism frequently coexists with or causes hypertension, and its treatment can unmask kidney disease that then sustains elevated blood pressure. Hyperaldosteronism, while less common, should be considered in cats with refractory hypertension or concurrent hypokalemia. Cardiac changes including left ventricular hypertrophy develop secondary to chronic pressure overload and may progress to heart failure if untreated.

Conditions with similar clinical presentations require differentiation when evaluating cats with signs potentially attributable to hypertension. Sudden blindness can result from primary retinal diseases, optic neuritis, or other ocular conditions unrelated to blood pressure. Neurological symptoms may stem from primary brain disease, vestibular disorders, metabolic disturbances, or toxicities. Increased drinking and urination, while associated with hypertension-causing diseases, can result from numerous other conditions. Blood pressure measurement provides a straightforward method to assess the contribution of hypertension to clinical presentations. Comprehensive diagnostic evaluation identifies all conditions present and guides treatment priorities.

Potential complications of uncontrolled hypertension include progressive and irreversible blindness from retinal damage, stroke and other cerebrovascular events, progression of chronic kidney disease, heart failure from sustained cardiac overload, and sudden death from catastrophic vascular events. Ocular complications are among the most common and devastating, with many cats experiencing significant vision loss before diagnosis. Prevention of these complications requires early detection through screening, appropriate treatment to achieve blood pressure control, and ongoing monitoring to maintain target levels. Understanding the serious potential consequences of untreated hypertension motivates the commitment to lifelong management that successful treatment requires.