Association between statin therapy and amputation-free survival in patients with critical limb ischemia in the CRITISCH registry

J Vasc Surg. 2017 Nov;66(5):1534-1542. doi: 10.1016/j.jvs.2017.05.115. Epub 2017 Aug 12.

Abstract

Objective: Secondary prevention in patients with critical limb ischemia (CLI) is crucial for the reduction of cardiovascular morbidity and mortality. Nonetheless, current recommendations are extrapolated from other high-risk populations because of the lack of CLI-dedicated trials. The aim of this explorative study was to evaluate the association of statin therapy with the outcomes of CLI patients.

Methods: The First-Line Treatments in Patients With Critical Limb Ischemia (CRITISCH) registry is a prospective multicenter registry analyzing the effectiveness of all available treatment strategies in 1200 CLI patients. For the purposes of this analysis, patients were divided into two groups based on statin administration. Treatment crossovers and nonadherent patients were excluded from analysis. The primary composite end point of this study was the amputation-free survival (AFS). Major adverse cardiovascular and cerebral events (MACCEs), time to death, and time to major amputation were also analyzed.

Results: Statin therapy was applied in 445 individuals (37%), 371 (31%) patients received no statins, and 384 subjects were excluded from analysis (treatment crossovers). Patients receiving statins were more likely to be younger (P < .001) and to have a history of coronary heart disease (P < .001) or previous intervention at index limb (P < .001). Patients receiving statin therapy had a lower hazard regarding AFS (hazard ratio [HR], 0.45; 95% confidence interval [CI], 0.34-0.63; P < .001) and death (HR, 0.40; 95% CI, 0.24-0.66; P < .001) as well as lower odds of MACCE (odds ratio, 0.41; 95% CI, 0.23-0.69; P = .001). However, statin therapy was not associated with reduced amputation rates (HR, 1.02; 95% CI, 0.67-1.56; P = .922). Statin effect on AFS was consistent among diabetics (HR, 0.47; 95% CI, 0.31-0.70; P < .001), patients with chronic kidney disease (HR, 0.53; 95% CI, 0.32-0.87; P = .012), and patients older than 75 years (HR, 0.40; 95% CI, 0.26-0.60; P < .001). Statin administration was also associated with an improved AFS in patients with antiplatelet medication (HR, 0.64; 95% CI, 0.41-0.99; P = .049) and without antiplatelet medication (HR, 0.26; 95% CI, 0.12-0.57; P = .001) and after both endovascular therapy (HR, 0.51; 95% CI, 0.34-0.76; P = .001) and bypass revascularization (HR, 0.38; 95% CI, 0.21-0.68; P = .001).

Conclusions: Statin therapy in CLI patients is associated with an increased AFS and lower rates of mortality and MACCEs without improving, however, the salvage rates of the affected limb.

Trial registration: ClinicalTrials.gov NCT01877252.

Publication types

  • Multicenter Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Age Factors
  • Aged
  • Aged, 80 and over
  • Amputation, Surgical*
  • Comorbidity
  • Critical Illness
  • Disease-Free Survival
  • Dyslipidemias / blood
  • Dyslipidemias / diagnosis
  • Dyslipidemias / drug therapy*
  • Dyslipidemias / mortality
  • Endovascular Procedures
  • Female
  • Germany
  • Humans
  • Hydroxymethylglutaryl-CoA Reductase Inhibitors / therapeutic use*
  • Ischemia / diagnosis
  • Ischemia / mortality
  • Ischemia / therapy*
  • Kaplan-Meier Estimate
  • Limb Salvage
  • Logistic Models
  • Male
  • Middle Aged
  • Multivariate Analysis
  • Odds Ratio
  • Peripheral Arterial Disease / diagnosis
  • Peripheral Arterial Disease / mortality
  • Peripheral Arterial Disease / therapy*
  • Platelet Aggregation Inhibitors / therapeutic use
  • Proportional Hazards Models
  • Protective Factors
  • Registries
  • Risk Assessment
  • Risk Factors
  • Secondary Prevention / methods*
  • Time Factors
  • Treatment Outcome
  • Vascular Grafting

Substances

  • Hydroxymethylglutaryl-CoA Reductase Inhibitors
  • Platelet Aggregation Inhibitors

Associated data

  • ClinicalTrials.gov/NCT01877252