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A Murine Model of Stent Implantation in the Carotid Artery for the Study of Restenosis
Published on: May 14, 2013
Azithromycin does not prevent six-month myointimal proliferation but attenuates the transient systemic inflammation
Dimas T Ikeoka1, Carolina Z Vieira, Pedro A Lemos
1Center for Medical Research and Clinical Institute for Medical and Chemical Laboratory Diagnostics, Medical University Graz, Stiftingtalstrasse, 24, 8010, Graz, Austria.
Insights
Antibiotic azithromycin did not improve stent outcomes but reduced C-reactive protein elevation post-procedure. This suggests an anti-inflammatory effect of azithromycin in patients undergoing stenting.
Area of Science:
- Cardiology
- Pharmacology
- Infectious Diseases
Background:
- Stent implantation can trigger systemic inflammation, potentially linked to Chlamydophila pneumoniae.
- Inflammatory markers rise post-stenting, impacting patient outcomes.
Purpose of the Study:
- To investigate the effect of azithromycin on 6-month angiographic outcomes after stenting.
- To assess the anti-inflammatory impact of antibiotic treatment in atherosclerotic patients.
Main Methods:
- A double-blinded, randomized study assigned 90 patients to oral azithromycin or placebo.
- Medication was given pre-stenting and continued for 12 weeks post-procedure.
- Angiographic and laboratorial parameters were assessed at multiple time points up to 6 months.
Main Results:
- No significant differences were observed in minimal luminal diameter, restenosis, or stenosis rates between groups at 6 months.
- Serum C-reactive protein significantly increased in the placebo group post-stenting but remained stable in the azithromycin group.
Conclusions:
- Azithromycin does not improve late angiographic outcomes following stenting.
- Azithromycin attenuates the post-stenting increase in C-reactive protein, demonstrating an anti-inflammatory effect.
Objectives:
Stent implantation produces a systemic increase of inflammatory markers that correlates with Chlamydophila pneumoniae infection in atherosclerotic plaque. We performed a clinical intervention study to investigate the effect of antibiotic treatment on 6-month follow-up angiographic minimal luminal diameter after stenting.
Methods:
Ninety patients were randomly assigned to oral azithromycin or placebo in a double-blinded and randomized fashion. Medication was initiated 2 weeks before a pre-scheduled stenting procedure and maintained 12 weeks thereafter. Angiographic outcomes were evaluated by a six-month follow-up angiography and laboratorial parameters were accessed by blood sampling 2 weeks before stenting, within the first 24 h after procedure and additional samples after four weeks and 6 months.
Results:
Minimal luminal diameter (1.76 +/- 0.56 mm Vs. 1.70 +/- 0.86 mm; P = 0.7), restenosis rate, diameter stenosis, late loss, and binary restenosis rates were comparable in placebo and azithromycin group in the 6 months follow-up. Serum levels of C-reactive protein presented a three fold significant increase in the control group one day after stenting but did not change in the azithromycin group (8.5 [3.0;16.4] Vs. 2.9 [1.7;6.6]-median [25;75 percentile] P < 0.01).
Conclusions:
Azithromycin does not improve late angiographic outcomes but attenuates the elevation of C-reactive protein levels after stenting, indicating an anti-inflammatory effect.
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