Objectifying exercise ischemia in peripheral vascular disease: a study in 120 patients

Area of Science:

• Vascular Medicine
• Diagnostic Imaging
• Exercise Physiology

Background:

• Peripheral obliterative vascular disease (POVD) affects limb circulation.
• Intermittent claudication is a common symptom of POVD.
• Accurate diagnosis of exercise-induced ischemia is crucial for patient management.

Purpose of the Study:

• To evaluate transcutaneous oxygen pressure (TcPO2) monitoring during treadmill testing for diagnosing exercise ischemia in POVD patients.
• To compare the diagnostic accuracy of TcPO2 measurements with clinical evaluation.
• To assess the utility of resting and post-exercise TcPO2 in identifying ischemic conditions.

Main Methods:

• Recruited three groups: 50 symptomatic POVD patients, 50 asymptomatic POVD patients, and 20 controls.
• Performed treadmill tests with concurrent transcutaneous oxygen pressure (TcPO2) monitoring.
• Measured resting TcPO2 and monitored TcPO2 during the recovery phase post-exercise.

Main Results:

• Resting TcPO2 was not a reliable indicator for exercise ischemia but could identify asymptomatic resting ischemia (9% of cases).
• A post-exercise fall in TcPO2 demonstrated 99% positive predictive accuracy for exercise ischemia.
• Clinical appraisal had an 87% positive predictive accuracy for exercise ischemia.

Conclusions:

• TcPO2 measurements combined with treadmill testing effectively diagnose exercise ischemia in both symptomatic and asymptomatic arteriopathic patients.
• This method offers superior accuracy compared to clinical evaluation alone, reducing false positives.
• TcPO2 monitoring during treadmill tests is a valuable tool for assessing exercise-induced ischemia in peripheral vascular disease.