Feline IMHA Clinical Dashboard

Feline IMHA Acute Dose Calculator

Configured strictly to 2019 ACVIM Consensus Guidelines for Cats

Feline Standard Active
⚖️
Weight Parameters
Patient Weight Entry

1. Immunosuppressive Plan

Prednisolone Only
2 mg/kg/day
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Suggested baseline: 2 mg/kg/day split twice daily (BID). Do not use Prednisone.
Mycophenolate Mofetil
10 mg/kg BID
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Dose target: 10 mg/kg twice daily (BID). Add for critical or poorly responsive patients.
🚨 FATAL TOXICITY WARNING: Never prescribe Azathioprine to cats. Felines are highly sensitive, and exposure causes rapid, catastrophic bone marrow suppression (myelosuppression) which is often fatal.

📋 ACVIM Single vs. Dual Therapy Advisor

Check presenting clinical signs to evaluate if dual protocol is indicated immediately:

Clinical Protocol Suggestion: Select presenting signs above to receive point-of-care recommendations.

2. Mandatory Thromboprophylaxis

Critical Priority
Clopidogrel Bisulfate
First-Choice / Flat Option
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Recommended first-line standard. Many felines receive a standard flat dose of 18.75 mg/cat (1/4 tablet) once daily.
Rivaroxaban
0.5 mg/kg daily
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Standard dosage: 0.5 mg/kg once daily. Directly blocks Factor Xa to combat hypercoagulable pathways.
⚠️ Prescribing Rule (Monotherapy Standard) Veterinarians should prescribe **EITHER** Clopidogrel **OR** Rivaroxaban alone. Combining an antiplatelet with an anticoagulant significantly escalates the risk of gastrointestinal hemorrhage and internal bleeding, and should be reserved strictly for intensive care patients with active thromboemboli.
💡
Thrombosis is a Primary Cause of Mortality. Feline IMHA patients enter a severely hypercoagulable state quickly. Antithrombotic therapies should be initiated concurrently with the first corticosteroid dose to optimize survival chances.

📋 Feline Diagnostic & Clinical Guidelines

🔍 Spherocytes in Cats: Diagnostic Pitfalls

Unlike in dogs, true spherocytes are extremely difficult to identify in feline blood smears because normal feline red blood cells naturally lack prominent central pallor. Do not rely heavily on spherocytosis for diagnosing feline IMHA. Focus instead on auto-agglutination, Coombs' testing, and exclusion of secondary triggers.

🧪 Secondary Viral & Parasitic Screens

Most cases of feline IMHA are secondary to infectious agents or neoplasms. It is mandatory to run PCR/serology screens for **FeLV/FIV**, **Mycoplasma hemofelis** (Feline Infectious Anemia), and *Cytauxzoon felis* before concluding that the disease is primary or autoimmune.

📚 Clinical Decision Guide: Single vs. Dual Protocols ▼

The Feline Corticosteroid Standard: Prednisolone is the first-line foundation of therapy. Cats cannot convert Prednisone to active Prednisolone efficiently in the liver, meaning Prednisone should *never* be prescribed. Mycophenolate Mofetil (MMF) serves as a secondary agent with a delayed clinical onset of several days.

When to use Dual Therapy (from Day 1): Initiate dual protocols concurrent with prednisolone immediately if the cat shows signs of severe hemolytic disease, active intravascular hemolysis, severe non-regenerative anemia, or profound auto-agglutination.

When to use Sequential Therapy: If the patient presents with stable, regenerative extravascular IMHA, starting with Prednisolone alone is standard. Add Mycophenolate or secondary agents (such as Chlorambucil/Cyclosporine) later if treatment fails (PCV drops after 5-7 days of steroids) or severe steroid intolerances appear.

Mathematical Formulas (Proof)
Immunosuppressant (Prednisolone): Weight (kg) × 2 mg/kg/day (Split BID is standard)
Secondary Agent (Mycophenolate): Weight (kg) × 10 mg/kg given twice daily (BID)
Platelet Inhibitor (Clopidogrel): Standard flat dose of 18.75 mg/cat once daily (Or alternate weight-based 2 mg/kg once daily)
Factor Xa Block (Rivaroxaban): Weight (kg) × 0.5 mg/kg given once daily
Source: Swann JW, et al. ACVIM Consensus Statement on treatment of IMHA in dogs and cats. JVIM 2019. MATH ALGORITHM VERIFIED FOR ACCURACY