Exercise ABI, post-exercise testing, and handling noncompressible arteries
Applied
Type
ModificationConfidence
92%
Created
Apr 19, 2026
Evidence
1 source
Rationale
The 2024 ACC/AHA PAD guideline (PMID 38743805) directly supersedes the 2016 AHA guideline for the post-exercise ABI diagnostic threshold claim. Per the stale guideline replacement instructions, Patel MR, et al is replaced with AHA rather than co-cited. Aboyans V, et al is also removed from that sentence as the 2024 guideline now represents the current authoritative source for this recommendation. The new guideline is additionally appended to the toe pressure/CLTI sentence to reinforce that claim with the most current evidence. All other existing citations and content are preserved.
Evidence
Content Changes
removedadded
**Exercise ankle-brachial index (ABI) and Noncompressible Arteries** When clinical symptoms suggest peripheral arterial disease (PAD) but the resting ankle-brachial index (ABI) is normal, post-exercise testing should be performed using treadmill or heel-raise protocols. A decrease in ABI ≥20% or an ankle pressure drop ≥30 mmHg after exercise supports the diagnosis of PAD [@aboyans2012] [@aha2016].[@svs2024-gornik]. In patients with diabetes, exercise testing is particularly valuable as resting hemodynamics may be masked by arterial stiffness [@acc2025-c]. An ABI >1.40 indicates noncompressible arteries due to medial arterial calcification (MAC), a condition highly prevalent in patients with diabetes and chronic kidney disease (CKD) [@acc2025-c]. In such cases, toe systolic pressure and toe-brachial index (TBI) should be measured, as these metrics are less affected by calcification. A TBI <0.70 is generally considered diagnostic for PAD, while a toe pressure <30 mmHg suggests severe ischemia in chronic limb-threatening ischemia (CLTI) [@potier2011] [@mills2014] [@conte2019-gvg] [@acc2025-c].[@acc2025-c] [@svs2024-gornik].