Rest Pain and a Toe Ulcer in a Referral for Claudication
Mr. K is a 64-year-old man with type 2 diabetes (A1c 8.4%) and a 40-pack-year smoking history, on aspirin and atorvastatin. He is referred for claudication with a six-month history of calf pain after 150 meters. Over the last three weeks he has had night pain at rest in the right foot, relieved by hanging the leg off the bed, and a new 1 cm ulcer at the base of the right great toe. The right foot is pale, cool, and hairless, with absent dorsalis pedis and posterior tibial pulses. Ankle-brachial index is 0.48 on the right and 0.82 on the left. He wants to start the walking program today. He reports no chest pain and no dyspnea.
1. What is the priority for this patient today, and which findings drive it?
Read the worked answer
The priority is urgent vascular referral for limb-threatening ischemia, not exercise. This is no longer claudication.
The presentation meets the classic triad for critical limb-threatening ischemia:
- Rest pain, nocturnal, relieved by dependency (hanging the leg off the bed is a compensatory hydrostatic maneuver).
- Tissue loss - a new toe ulcer.
- Objective hypoperfusion - absent pedal pulses, pale cool hairless skin, ABI 0.48.
Starting a walking program would at best be useless and at worst delay revascularization while tissue loss progresses. Same-day or next-day vascular surgery contact is appropriate; if the ulcer shows spreading erythema, purulent drainage, or systemic signs, this is an emergency.
One nuance that matters in diabetes: medial calcinosis can falsely elevate the ABI. An ABI of 0.48 is low in anyone, but if his numbers ever look normal in the setting of an ischemic ulcer, toe pressures or transcutaneous oxygen are the more reliable measures. Do not let a reassuring ABI talk you out of the clinical picture.
2. He undergoes a femoral-distal bypass and is cleared at six weeks. Write the exercise prescription with parameters and rationale.
Read the worked answer
Supervised treadmill walking:
- Frequency: 3-5 sessions per week.
- Session: 30-45 minutes of intermittent walking within a 60-minute visit.
- Intensity: set speed and grade so claudication begins within 3-5 minutes; walk to a moderate-to-near-maximal tolerable pain level (about 3-4/10), then rest until it resolves, then repeat.
- Progression: increase grade or speed as tolerated when he reaches the target number of bouts before reaching target pain.
Rationale: repeated bouts of exercise to ischemic threshold drive skeletal muscle and endothelial adaptation and collateral development, and supervised programs produce the largest gains in walking distance. Alternating with rest lets him accumulate the total volume that drives adaptation.
Alternatives/adjuncts: arm ergometry or pain-free interval walking if the leg cannot tolerate load; a structured home walking program on non-supervised days.
Program-level safeguards because he has diffuse atherosclerosis: PAD is a systemic marker of cardiovascular risk, and diabetes blunts anginal symptoms, so monitor for atypical presentations - jaw or arm discomfort, unexplained dyspnea, diaphoresis, or unusual fatigue - not just chest pain.
3. What else must be integrated into this plan (diabetes, smoking, foot and wound care), and what would make you stop a session?
Read the worked answer
Diabetes: check glucose before exercise. Treat and defer if hypoglycemic (under about 70 mg/dL); use caution with hyperglycemia (roughly over 250 mg/dL with ketones, or over 300 mg/dL without). He has A1c 8.4%, so expect wide swings. Ensure hydration, inspect feet before and after, and require well-fitting protective footwear - never exercise in slippers or barefoot with a healing ulcer.
Smoking: the single largest modifiable risk factor for graft failure and disease progression. Offer cessation referral at every visit, brief advice, and pharmacotherapy discussion through his physician. Frame it in terms of his graft, not general health.
Wound and foot care: coordinate with podiatry/wound care for offloading the ulcer; inspect the graft site and the incision; teach daily self-inspection and when to call.
Stop the session and escalate for: chest pain or pressure, unexplained dyspnea, dizziness or syncope, a new cool pale or mottled foot, a sudden change in rest pain, new or worsening ulceration, or blood glucose outside safe limits.
Document walking distance to claudication onset each visit; it is the objective marker that justifies continued supervised care and shows the payer the plan is working.