Hypertrophic Cardiomyopathy in American Wirehairs
Hypertrophic cardiomyopathy (HCM) can affect any cat, including American Wirehairs. This condition thickens the heart muscle, impairs blood flow, and can lead to heart failure or blood clot formation. Since cats often hide illness, annual cardiac screening helps catch HCM before a crisis occurs.
Prevalence
The most common feline heart disease
Typical Onset
1-5 years (genetic) or 8+ years (age-related)
Severity
Critical
Symptoms to Watch For
If your American Wirehair shows any of these signs, monitor closely and consult your veterinarian.
Risk Factors
- •genetic factors
- •male cats affected more severely
- •hyperthyroidism (secondary HCM)
- •high blood pressure
- •obesity
Diagnosis
Echocardiogram reveals thickened left ventricular walls (>6mm in cats). NT-proBNP blood test screens for cardiac disease. Cardiac auscultation may detect murmur or gallop rhythm, but many affected cats have no auscultable abnormalities. DNA testing available for MyBPC3 mutation in Maine Coons and Ragdolls. Chest radiographs evaluate for fluid accumulation.
Treatment
Beta-blockers (atenolol) or calcium channel blockers (diltiazem) to reduce heart rate and improve filling. Clopidogrel (anti-platelet) to reduce thromboembolism risk. Furosemide if congestive heart failure develops. Emergency treatment for saddle thrombus: pain management, anti-coagulation, supportive care. Prognosis varies widely — asymptomatic cats may live years; cats presenting with CHF or thrombus have guarded prognosis.
Prevention
DNA testing for MyBPC3 mutation in at-risk breeds. Annual echocardiographic screening for breeding cats. NT-proBNP screening at annual checkups. Maintain healthy weight. Avoid stress where possible.
When to See a Vet
EMERGENCY: open-mouth breathing, sudden hind leg paralysis (cold, painful back legs), or collapse. Non-emergency: annual cardiac screening for at-risk breeds. Many cats show no symptoms until a crisis — proactive screening is critical.
Other Health Conditions in American Wirehairs
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