Feline Secondary Hypertension: Welfare and Organ Protection

Key Facts

• Hypertension affects 20-65% of cats with CKD and 20-25% of cats with hyperthyroidism
• Target organ damage affects the eyes (retinal detachment, blindness), brain (seizures, behavior change), heart, and kidneys
• Blood pressure above 170 mmHg (systolic) requires treatment to prevent irreversible organ damage
• Amlodipine is the first-line treatment and is highly effective in most cats
• Many cats are presented with acute blindness from hypertensive retinal detachment — early detection prevents this

Welfare Considerations

Secondary hypertension in cats causes significant welfare impact through the target organ damage it causes. Acute blindness from retinal detachment is catastrophically distressing — cats become suddenly unable to navigate their familiar environment and show extreme anxiety and confusion. Brain hemorrhages from hypertensive crises cause seizures and behavioral changes. The kidney damage caused by hypertension accelerates CKD progression, creating a vicious cycle. Welfare-centered management requires proactive blood pressure monitoring in all cats over 10 years and any cat with CKD or hyperthyroidism, not waiting for signs of target organ damage to develop.

What You Can Do

• Measure blood pressure in all cats over 10 years of age at annual health checks
• Any cat with CKD or hyperthyroidism should have blood pressure checked at every veterinary visit
• Treat systolic pressure above 170 mmHg with amlodipine as directed — it is safe and effective
• If your cat suddenly becomes blind, seek emergency veterinary care immediately — retinal detachment may be reversible if treated within 24-72 hours
• Monitor blood pressure response to treatment within 1-2 weeks and adjust dosing as needed