1. What is ABPI?

The Ankle-Brachial Pressure Index (ABPI) is a simple, non-invasive test used to assess peripheral arterial disease in the legs. It compares the blood pressure at the ankle with the blood pressure in the upper arm.

2. How Does the Calculator Work?

The calculator uses the ABPI formula:

Where:

• Ankle Pressure — Highest systolic pressure from either dorsalis pedis or posterior tibial arteries
• Brachial Pressure — Highest systolic pressure from either arm

Interpretation:

• >1.3: Abnormal (possible non-compressible vessels)
• 0.9-1.3: Normal
• 0.7-0.89: Mild arterial disease
• 0.4-0.69: Moderate arterial disease
• <0.4: Severe arterial disease

3. Importance of ABPI Measurement

Details: ABPI is crucial for diagnosing peripheral arterial disease (PAD), assessing its severity, and monitoring disease progression or response to treatment.

4. Using the Calculator

Tips: Enter both ankle and brachial pressures in mmHg. Measurements should be taken with the patient at rest in a supine position after 10 minutes of rest.

5. Frequently Asked Questions (FAQ)

Q1: Why measure ABPI?
A: ABPI helps diagnose peripheral arterial disease, assess its severity, and predict cardiovascular risk.

Q2: How to measure pressures accurately?
A: Use a Doppler ultrasound device and appropriate blood pressure cuffs. Take measurements in both ankles and arms.

Q3: What affects ABPI results?
A: Factors include patient position, recent exercise, smoking, room temperature, and technician experience.

Q4: When is ABPI unreliable?
A: In patients with non-compressible vessels (e.g., diabetes, medial calcification) where ABPI may be falsely elevated.

Q5: What's the difference between ABPI and ABI?
A: They are the same measurement. ABPI (Ankle-Brachial Pressure Index) is the term more commonly used in some countries, while ABI (Ankle-Brachial Index) is used in others.