In evaluating suspected peripheral arterial disease in a patient with intermittent claudication and diminished leg pulses, what is the initial noninvasive test?

In evaluating suspected peripheral arterial disease in a patient with intermittent claudication and diminished leg pulses, what is the initial noninvasive test?

• A. Ankle-brachial index measurement
• B. CT angiography
• C. Duplex ultrasonography
• D. Exercise treadmill test

Answer: (A)

The initial noninvasive test is the ankle-brachial index measurement. This test quickly and simply compares the systolic blood pressure in the ankles with that in the arms to assess for arterial obstruction. A reduced ratio indicates peripheral arterial disease and helps quantify how severe the blockage is, guiding initial management and the need for further imaging. It’s inexpensive, widely available, and can be performed at the bedside or in clinic. In diabetics or people with arterial calcification, pressures can be noncompressible and the ABI may be less accurate, in which case a toe-brachial index or other testing may be used, but as a starting point, ABI is the best initial test. If ABI confirms PAD or if more detail about anatomy is needed, duplex ultrasound or CT/MR angiography can map the vessels. Exercise testing might be used to assess functional limitation, but it does not replace ABI for establishing the presence of hemodynamically significant PAD.

The initial noninvasive test is the ankle-brachial index measurement. This test quickly and simply compares the systolic blood pressure in the ankles with that in the arms to assess for arterial obstruction. A reduced ratio indicates peripheral arterial disease and helps quantify how severe the blockage is, guiding initial management and the need for further imaging. It’s inexpensive, widely available, and can be performed at the bedside or in clinic. In diabetics or people with arterial calcification, pressures can be noncompressible and the ABI may be less accurate, in which case a toe-brachial index or other testing may be used, but as a starting point, ABI is the best initial test. If ABI confirms PAD or if more detail about anatomy is needed, duplex ultrasound or CT/MR angiography can map the vessels. Exercise testing might be used to assess functional limitation, but it does not replace ABI for establishing the presence of hemodynamically significant PAD.