Diabetes and other vascular risk factors in association with the risk of lower extremity amputation in chronic limb-threatening ischemia: a prospective cohort study

• Published in: Cardiovascular diabetology Vol. 21; no. 1; p. 7
• Main Authors: Ying, Ariel Fangting, Tang, Tjun Yip, Jin, Aizhen, Chong, Tze Tec, Hausenloy, Derek John, Koh, Woon-Puay
• Format: Journal Article
• Language: English
• Published: England BioMed Central 08.01.2022; BMC
• Subjects: Aged; Alcohol; Amputation; Amputation, Surgical; Body Mass Index; Cardiovascular disease; Cardiovascular risk factors; Chronic Disease; Chronic illnesses; Clinical epidemiology; Cohort analysis; Coronary vessels; Diabetes; Diabetes and lower limb amputation; Diabetes and peripheral vascular disease; Diabetes mellitus; Diabetes Mellitus - diagnosis; Diabetes Mellitus - epidemiology; Epidemiology; Female; Humans; Hypertension; Hypertension - epidemiology; Incidence; Intermittent claudication; Ischemia; Ischemia - diagnosis; Ischemia - epidemiology; Ischemia - surgery; Male; Middle Aged; Obesity - epidemiology; Original Investigation; Prognosis; Prospective Studies; Risk Assessment; Risk Factors; Singapore - epidemiology; Smoking; Smoking - adverse effects; Smoking - epidemiology; Survival analysis; Vascular epidemiology; Vein & artery diseases; Singapore; Diabetes and lower limb amputation; Vascular epidemiology; Clinical epidemiology; Diabetes and peripheral vascular disease; Cardiovascular risk factors
• ISSN: 1475-2840; 1475-2840
• DOI: 10.1186/s12933-021-01441-0

Patients with diabetes are at increased risk of developing chronic limb-threatening ischemia (CLTI) due to peripheral arterial disease, and this often results in lower extremity amputation (LEA). Little is known of the interaction between diabetes and other vascular risk factors in affecting the risk of CLTI. We investigated the association of diabetes, and its interaction with hypertension, body mass index (BMI) and smoking, with the risk of LEA due to CLTI in the population-based Singapore Chinese Health Study. Participants were interviewed at recruitment (1993-1998) and 656 incident LEA cases were identified via linkage with nationwide hospital database through 2017. Multivariate-adjusted Cox proportional hazards models were used to compute hazard ratios (HRs) and 95% CIs for the associations. The HR (95% CI) for LEA risk was 13.41 (11.38-15.79) in participants with diabetes compared to their counterparts without diabetes, and the risk increased in a stepwise manner with duration of diabetes (P for trend < 0.0001). Hypertension and increased BMI independently increased LEA risk in those without diabetes but did not increase the risk in those with diabetes (P for interaction with diabetes ≤ 0.0006). Conversely, current smoking conferred a risk increment of about 40% regardless of diabetes status. Although diabetes conferred more than tenfold increase in risk of LEA, hypertension and increased BMI did not further increase LEA risk among those with diabetes, suggesting a common mechanistic pathway for these risk factors. In contrast, smoking may act via an alternative pathway and thus confer additional risk regardless of diabetes status.