Comorbidities and exercise capacity in older patients with intermittent claudication

Area of Science:

• Cardiovascular Medicine
• Exercise Physiology

Background:

• Peripheral arterial disease (PAD) with intermittent claudication frequently coexists with coronary artery disease (CAD) and other conditions.
• Limited data exists on how these comorbidities affect exercise capacity and functional status in PAD patients.

Purpose of the Study:

• To investigate the impact of CAD, diabetes, smoking, and prior revascularization on exercise capacity and claudication in PAD patients.
• To assess the relationship between comorbidities and functional outcomes like peak oxygen consumption (VO2) and claudication pain times.

Main Methods:

• Maximal effort treadmill testing was performed on 119 male PAD patients (Fontaine Stage II).
• Evaluated outcomes included peak VO2, time to claudication onset, and maximal claudication pain duration.
• Statistical analyses (ANCOVA) were used to assess the influence of smoking status and other comorbidities.

Main Results:

• Current smokers exhibited lower peak VO2 (liters/min) and shorter claudication pain times compared to former or never smokers.
• After adjusting for body weight, the difference in peak VO2 between smoking groups became a trend.
• Ankle-brachial index (ABI) post-exercise was lower in smokers.
• No significant differences in functional measures were found based on the presence of CAD, diabetes, or other assessed conditions.

Conclusions:

• Smoking adversely impacts exercise capacity and ambulatory function in PAD patients.
• Coexisting conditions like CAD and diabetes had a minor effect on exercise capacity compared to smoking.
• Claudication pain remains the primary limitation to walking ability in PAD patients, overshadowing the impact of comorbidities.