Blood Pressure Monitoring in Cats: When and How to Screen

Hypertension affects a significant proportion of cats with underlying disease and causes irreversible organ damage without appropriate monitoring and treatment.

Key Facts

Feline hypertension is defined as systolic blood pressure persistently above 160 mmHg
Hypertension most commonly occurs secondary to CKD, hyperthyroidism, or primary hyperaldosteronism
Target organ damage includes hypertensive retinopathy, sudden blindness, renal damage, and cardiac hypertrophy
Amlodipine is the first-line antihypertensive drug for cats with approximately 90% response rate
Telmisartan addresses both hypertension and reduces proteinuria in CKD cats
Multiple readings are needed for accurate assessment - single readings may be affected by 'white coat' effect
Annual blood pressure screening from 7 years of age or at diagnosis of predisposing conditions

Welfare Considerations

Hypertension in cats causes progressive, silent organ damage until acute events - sudden blindness from retinal detachment, or neurological signs from cerebrovascular damage - reveal advanced disease. Regular blood pressure monitoring in at-risk cats (those with CKD, hyperthyroidism, or over 7 years) enables treatment initiation before irreversible damage occurs. Vision loss from hypertensive retinopathy is the most welfare-significant manifestation - it is largely preventable through appropriate monitoring and treatment, but rarely reversible once retinal detachment has occurred.

What You Can Do

Request blood pressure measurement at each veterinary visit for cats with CKD or hyperthyroidism
Screen all cats over 7 years annually for hypertension even without known predisposing disease
Allow cats to acclimatize before measurement - multiple readings improve accuracy
Begin amlodipine treatment promptly when persistently elevated readings are confirmed
Seek emergency assessment for any cat showing sudden vision loss or neurological signs
Monitor blood pressure at 1-2 week intervals after starting or adjusting antihypertensive therapy
Examine the retinas at each BP check - early retinal changes may precede clinical vision loss