Cat Hypertension and Target Organ Damage Welfare

Feline systemic hypertension is common in older cats and causes severe welfare impacts through retinal detachment causing blindness, kidney damage, and cardiac hypertrophy if undetected.

Key Facts

Systemic hypertension affects approximately 20-65% of cats with chronic kidney disease
Systolic blood pressure above 160 mmHg warrants treatment; above 180 mmHg is immediately dangerous
Sudden-onset blindness from hypertensive retinal detachment is the most dramatic acute presentation
Amlodipine is the first-line treatment and rapidly reduces blood pressure in most cats
Blood pressure should be measured at every health check for cats over 7 years
Hypertension is usually secondary to CKD, hyperthyroidism, or primary (idiopathic) in cats
Treatment prevents further target organ damage but cannot reverse existing blindness

Welfare Considerations

Hypertensive retinal detachment causes sudden, complete blindness - a profound welfare event that transforms a cat's ability to navigate its environment, escape threats, and engage in normal predatory play behavior. Many cats adapt remarkably well to blindness in familiar environments, but the prevention of this outcome through routine blood pressure monitoring is clearly preferable. The good news is that amlodipine is inexpensive, well-tolerated, and highly effective. The welfare barrier is primarily awareness: many owners do not know blood pressure monitoring is available and important for senior cats.

What You Can Do

Request blood pressure measurement at every veterinary visit for cats over 7 years
Learn to recognize sudden behavioral changes in cats - disorientation and bumping into objects may indicate acute vision loss
Do not rearrange furniture for newly blind cats - familiar environments allow rapid adaptation
Administer amlodipine at the same time each day with food to maximize adherence
Monitor for signs of controlled hypertension including stable activity and continued grooming behavior