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CLINICAL RESEARCH: PERIPHERAL ARTERIAL DISEASE

Progression of Peripheral Arterial Disease Predicts Cardiovascular Disease Morbidity and Mortality

Michael H. Criqui, MD, MPH^_*,,_*, John K. Ninomiya, PhD, MSc^_*, Deborah L. Wingard, PhD^_*, Ming Ji, PhD and Arnost Fronek, MD, PhD

^_* Department of Family and Preventive Medicine, University of California, San Diego, California
Department of Medicine, University of California, San Diego, California
Department of Surgery and Bioengineering, University of California, San Diego, California
San Diego State University, School of Public Health, San Diego, California

Manuscript received February 5, 2008; revised manuscript received July 2, 2008, accepted July 7, 2008.

^_* Reprint requests and correspondence: Dr. Michael H. Criqui, University of California, San Diego, 9500 Gilman Drive, Mail Code 0607, La Jolla, California 92093-0607 (Email: mcriqui{at}ucsd.edu).

Objectives: The purpose of this study was to examine the association of progressive versus stable peripheral arterial disease (PAD) with the risk of future cardiovascular disease (CVD) events.

Background: An independent association between PAD, defined by low values of the ankle-brachial index (ABI), and future CVD risk has been demonstrated. However, the prognostic significance of declining versus stable ABI has not been studied.

Methods: We recruited 508 subjects (59 women, 449 men) from 2 hospital vascular laboratories in San Diego, California. ABI and CVD risk factors were measured at Visit 2 (1990 to 1994). ABI values from each subject's earliest vascular laboratory examination (Visit 1) were abstracted from medical records. Mortality and morbidity were tracked for 6 years after Visit 2 using vital statistics and hospitalization data.

Results: In multivariate models adjusted for CVD risk factors, very low (<0.70) and, in some cases, low (0.70 ABI <0.90) Visit 2 ABIs were associated with significantly elevated all-cause mortality, CVD mortality, and combined CVD morbidity/mortality at 3 and 6 years. Decreases in ABI of more than 0.15 between Visit 1 and Visit 2 were significantly associated with an increased risk of all-cause mortality (risk ratio [RR]: 2.4) and CVD mortality (RR: 2.8) at 3 years, and CVD morbidity/mortality (RR: 1.9) at 6 years, independent of Visit 2 ABI and other risk factors.

Conclusions: Progressive PAD (ABI decline >0.15) was significantly and independently associated with increased CVD risk. Patients with decreasing ABI may be candidates for more intensive cardiovascular risk factor management.

Key Words: peripheral vascular disease • cardiovascular diseases • risk factors • morbidity • mortality

Abbreviations and Acronyms   ABI = ankle-brachial index   CHD = coronary heart disease   CVD = cardiovascular disease   MAC = medial arterial calcification   PAD = peripheral arterial disease   RR = risk ratio   SDCQ = San Diego Claudication Questionnaire

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